Category:501 Concrete - Revision history

Hoskir: /* 501.1.4.5 Compressive Strength */ updated per RR 4157 (Adding language for how concrete cylinders need to be marked when they are submitted to the central lab for testing.)

2026-01-28T21:48:50Z

501.1.4.5 Compressive Strength: updated per RR 4157 (Adding language for how concrete cylinders need to be marked when they are submitted to the central lab for testing.)

← Older revision		Revision as of 16:48, 28 January 2026
Line 96:		Line 96:

	Cylinder forms shall be filled with fresh concrete in accordance with the instructions provided by AASHTO T 23 (ASTM C 31). Care should be taken when placing the caps on the molds to avoid damage to the surface of the concrete. The lids should be kept on tight to prevent moisture loss.		Cylinder forms shall be filled with fresh concrete in accordance with the instructions provided by AASHTO T 23 (ASTM C 31). Care should be taken when placing the caps on the molds to avoid damage to the surface of the concrete. The lids should be kept on tight to prevent moisture loss.

			When cylinders are being submitted to the Central Laboratory for testing, the following information should be written on the side of the cylinder mold:
			:(a) AASHTOware Project (AWP) Identification No.
			:(b) Date of Pour
			:(c) Testing Age
			:(d) Cement Factor (sacks/cubic yard)
			:(e) Project Information (Job No., Route, and County)

	=====501.1.4.5.1 Curing =====		=====501.1.4.5.1 Curing =====

Hoskir: updated TOC formatting

2026-01-28T21:37:11Z

updated TOC formatting

← Older revision		Revision as of 16:37, 28 January 2026
Line 1:		Line 1:
	~~[[image~~:~~501 concrete.jpg\|~~right~~\|525px]]~~		<div style="float: right; margin-top: 5px; margin-left: 15px; margin-bottom: 15px;">__TOC__</div>
	~~==501.1 Construction Inspection for Sec 501==~~
	{\|style="padding: 0.3em; margin-left:15px; border:1px solid #a9a9a9; text-align:center; font-size: 95%; background:#ffddcc" width="210px" align="right"		{\|style="padding: 0.3em; margin-top: 5px; margin-left:15px; border:1px solid #a9a9a9; text-align:center; font-size: 95%; background:#ffddcc" width="210px" align="right"
	\|-		\|-
	\|'''Water Reducer, PCCP'''		\|'''Water Reducer, PCCP'''
Line 25:		Line 25:
	\|'''See also:''' [https://www.modot.org/research-publications Research Publications]		\|'''See also:''' [https://www.modot.org/research-publications Research Publications]
	\|}		\|}

			[[image:501 concrete.jpg\|right\|525px]]
			==501.1 Construction Inspection for Sec 501==

	===501.1.1 Material (Sec 501.2)===		===501.1.1 Material (Sec 501.2)===
	[http://www.modot.org/business/standards_and_specs/SpecbookEPG.pdf#page=8 Sec 501.2] of the Standard Specifications include specific requirements of material to be used. Plant inspectors are responsible to the resident engineer for verifying acceptability of all materials before they are incorporated into the work.		[http://www.modot.org/business/standards_and_specs/SpecbookEPG.pdf#page=8 Sec 501.2] of the Standard Specifications include specific requirements of material to be used. Plant inspectors are responsible to the resident engineer for verifying acceptability of all materials before they are incorporated into the work.

Hoskir: /* 501.2.9 Aluminum Powder */ updated per RR4134

2026-01-05T15:04:56Z

501.2.9 Aluminum Powder: updated per RR4134

@@ Line 935: / Line 935: @@
 All Quality Control (QC) testing shall be performed on QC test equipment. Quality Assurance (QA) testing shall be performed on QA test equipment. QC tests shall not be performed using QA testing equipment and QA tests shall not be performed using QC testing equipment. QA samples may be submitted to the Central Laboratory for testing if the district does not have the necessary testing equipment.
-===501.2.9 Aluminum Powder===
+===501.2.9 Expansive Concrete===
-For closure pours, unpolished aluminum powder may be added to offset shrinkage that will occur as concrete hardens. The aluminum powder reacts with the cement to generate hydrogen gas. The formation of hydrogen gas causes the concrete to expand, which offsets the shrinkage.
+For closure pours, an additive shall be used to offset shrinkage. The additive shall be an expansive Type K or Type G component in accordance with ACI PRC-223.
-'''501.2.9.1''' The manufacturer shall specify the dosage rate for the unpolished aluminum powder. Typical dosage rate ranges from 2.5 to 5.5 grams per 100 pounds of Portland cement. Concrete involving supplementary cementitious materials (i.e. fly ash, GGBFS, silica fume), only the Portland cement portion should be treated at the recommended dosage rate, unless otherwise stated by the manufacturer.
+====501.2.9.1====
+The target 28-day expansion when tested according to ASTM C878 shall be between 0.02% and 0.15%. The manufacturer shall specify the dosage rate.

Hoskir: /* 501.1.6 Measurement of Material (Sec 501.6) */ updated per RR4020

2025-04-11T20:20:34Z

501.1.6 Measurement of Material (Sec 501.6): updated per RR4020

← Older revision		Revision as of 15:20, 11 April 2025
Line 230:		Line 230:

	===501.1.6 Measurement of Material (Sec 501.6)===		===501.1.6 Measurement of Material (Sec 501.6)===

	====501.1.6.1 Mass Determination (Sec 501.6.1)====		====501.1.6.1 Mass Determination (Sec 501.6.1)====
	The plant inspector must assure that all equipment is of an approved design and that all		The plant inspector must assure that all equipment is of an approved design and that all
Line 244:		Line 245:

	====501.1.6.3 Scale Calibration (Sec 501.6.3)====		====501.1.6.3 Scale Calibration (Sec 501.6.3)====
	Scales may be calibrated in the following manner: Balance the scales accurately with no load. Use standard test weights for the test load. Test weights are suspended from the weighing hopper in such a manner that the test load is uniformly distributed. Load the ~~scale~~, using combinations of weights totaling approximately ~~1000~~ pounds with test weights as required by [~~http~~://www.modot.org/~~business/standards_and_specs/SpecbookEPG.pdf#page=8~~ Sec 501] of the Standard Specifications, so that the added weights will produce a load that is a multiple of an increment on the scale indicator. Load the scales to approximately 75% of the working load. Then use combinations of weights, totaling not more than 150 pounds, for the remainder of the test. Record scale ~~readings for each increment of test weight~~. ~~When the maximum number of standard weights has been placed on the scale equal to an increment on the scale indicator and weight recorded, remove~~ weights and draw ~~a quantity~~ of aggregate equal to the test load from the bins in the weighing hopper. Apply standard weights again, and ~~repeat this procedure~~ until each scale has been calibrated to a load approximately 5% greater than the maximum working load.		Scales may be calibrated in the following manner: Balance the scales accurately with no load. Use standard test weights for the test load. Test weights are suspended from the weighing hopper in such a manner that the test load is uniformly distributed. Load the aggregate scales, using combinations of weights totaling approximately 2000 pounds with test weights as required by [https://www.modot.org/missouri-standard-specifications-highway-construction Sec 501] of the Standard Specifications, and record scale reading. Remove weights and draw 2000 pounds of aggregate equal to the test load from the bins into the weighing hopper. Apply 2000 pounds of standard weights and record scale reading again. Repeat this procedure of drawing up aggregate, adding test weights, and recording scale weights until each scale has been calibrated to a load approximately 5% greater than the maximum working load. Cement scales should be calibrated in the same manner with approximately 500 pounds of test weights. Aggregate or cement scales may be calibrated using different weight increments, if approved by the engineer.

	~~Calibration of~~ scales ~~on concrete proportioning plants other than PCC pavement plants vary as follows:~~
	~~:Scale~~ should be ~~loaded~~ in approximately ~~1000 pound increments (depending on number~~ of ~~standard 50 pound~~ test weights ~~required) so that the added weights will produce a load that is a multiple of an increment on the scale indicator~~. ~~Load the scale to within approximately 250 pounds of each working load~~, ~~and then~~ by not more than 150 pound increments to approximately 250 pounds beyond each working load. Included in this range would be working loads for each batch size commonly used for each aggregate, when more than one aggregate is weighed on the ~~same scale, such as dial scales~~.

	PCC pavement plants should be calibrated before actual proportioning starts from any new plant set up. Scale verification by the contractor or producer shall occur six months after the last plant calibration.		PCC pavement plants should be calibrated before actual proportioning starts from any new plant set up. Scale verification by the contractor or producer shall occur six months after the last plant calibration.
Line 263:		Line 261:
	These weight intervals for calibration, verification, balance and sensitivity are considered to be the maximum. If difficulty is encountered with the batching operation or if any of the aforementioned checks indicate excessive deviations, the plant should be recalibrated to ensure compliance.		These weight intervals for calibration, verification, balance and sensitivity are considered to be the maximum. If difficulty is encountered with the batching operation or if any of the aforementioned checks indicate excessive deviations, the plant should be recalibrated to ensure compliance.

	[~~http~~://www.modot.org/~~business/standards_and_specs/SpecbookEPG.pdf#page=8~~ Sec 502.4.5] of the Standard Specifications sets out certain conditions under which automatic batching equipment must be furnished. In addition to calibration procedures, automatic equipment must be checked for compliance with requirements of Sec 502.4.5 of the Standard Specifications. It is particularly important to ascertain that the discharge		[https://www.modot.org/missouri-standard-specifications-highway-construction Sec 502.4.5] of the Standard Specifications sets out certain conditions under which automatic batching equipment must be furnished. In addition to calibration procedures, automatic equipment must be checked for compliance with requirements of Sec 502.4.5 of the Standard Specifications. It is particularly important to ascertain that the discharge
	mechanism will not operate when ingredients have not been weighed within specified tolerances.		mechanism will not operate when ingredients have not been weighed within specified tolerances.

	This check can be made by adding or removing a weight slightly greater than the permissible		This check can be made by adding or removing a weight slightly greater than the permissible tolerance to see if the discharge mechanism locks and appropriate warning is given, such as a light buzzer.
	tolerance to see if the discharge mechanism locks and appropriate warning is given, such as
	a light buzzer.

	In the case of a breakdown in equipment which requires a shift to manual operation, the time of breakdown should be noted in the inspector's diary. The contractor should be promptly advised of the limitation for manual batching.		In the case of a breakdown in equipment which requires a shift to manual operation, the time of breakdown should be noted in the inspector's diary. The contractor should be promptly advised of the limitation for manual batching.

Hoskir: /* 501.1.10.1 General */ updated per RR3828

2024-01-29T15:35:03Z

501.1.10.1 General: updated per RR3828

← Older revision		Revision as of 10:35, 29 January 2024
Line 489:		Line 489:
	===501.1.10 2AA Sheet For Concrete Pavement===		===501.1.10 2AA Sheet For Concrete Pavement===
	====501.1.10.1 General====		====501.1.10.1 General====
	The 2AA Sheet is a summary and graphic record of the design, typical section, materials, and methods used in the construction of the base, surfacing, and shoulders of a portland cement concrete paving project. ~~It will include data on~~ the ~~throughway at all interchanges and underpasses. It~~ is ~~not~~ necessary ~~to prepare a 2AA Sheet for pavement in traffic interchanges~~ or ~~underpasses constructed in isolated sections 750 feet or less~~ in length ~~or isolated areas within the primary travelway of 1000 S.Y or less~~. The blank 2AA Sheet can be located ~~on Micro Station Directory. t:\standard\wsmod\design\seed_i\i_2aa-2d~~.~~dgn~~		The 2AA Sheet is a summary and graphic record of the design, typical section, materials, and methods used in the construction of the base, surfacing, and shoulders of a portland cement concrete paving project. This record is to be produced by the paving inspector, but is only necessary on projects that have one or more mainline concrete paving segments that exceed one-half mile in length. The blank 2AA Sheet can be located in the OpenRoads Designer CADD Standards.

	Information provided on this sheet is valuable for future investigations and often is not available from any other source. Information on the paving work is to be recorded by daily entries made by the plant inspector on a 2AA Sheet, kept as a work sheet in the laboratory during the paving. This requires close liaison between the plant inspector and the field inspection force. If the slab inspector notes any changes in construction details or other data of the type required on the 2AA Sheet, the slab inspector should immediately notify the plant inspector of the change and the station where it occurred. The plant inspector should promptly plot it on the 2AA work sheet. Inspectors on base and shoulder construction should provide data in a like manner so that a complete, accurate record can be kept up-to-date.		Information provided on this sheet is valuable for future investigations and often is not available from any other source. Information on the paving work is to be recorded by daily entries made by the plant inspector on a 2AA Sheet, kept as a work sheet in the laboratory during the paving. This requires close liaison between the plant inspector and the field inspection force. If the slab inspector notes any changes in construction details or other data of the type required on the 2AA Sheet, the slab inspector should immediately notify the plant inspector of the change and the station where it occurred. The plant inspector should promptly plot it on the 2AA work sheet. Inspectors on base and shoulder construction should provide data in a like manner so that a complete, accurate record can be kept up-to-date.

Kleins1: Updated per COCM Revision Req. #3478

2022-07-25T15:45:19Z

Updated per COCM Revision Req. #3478

Show changes

Smithk: Per CM, revision reflects AASHTO's renaming of test method T23 to R100

2021-11-09T21:10:12Z

Per CM, revision reflects AASHTO's renaming of test method T23 to R100

← Older revision		Revision as of 16:10, 9 November 2021
Line 98:		Line 98:
	Each set of compressive test specimens for standard cure consists of two 6x12 cylinders or three 4x8 cylinders.		Each set of compressive test specimens for standard cure consists of two 6x12 cylinders or three 4x8 cylinders.

	Standard Cure specimens shall be cured in accordance with AASHTO ~~T23~~ (ASTM C31) for initial and final curing.		Standard Cure specimens shall be cured in accordance with AASHTO R100 (ASTM C31) for initial and final curing.

	'''Standard Cure – Initial'''		'''Standard Cure – Initial'''
Line 128:		Line 128:
	:4) Form removal.		:4) Form removal.

	Field curing shall be in accordance with AASHTO ~~T23~~ (ASTM C 31). Store cylinders in or on the structure as near as practical to the represented concrete. Protect all surfaces of the cylinders from the elements and ensure a temperature and moisture environment similar to the formed work. To meet these conditions specimens made for the purpose of determining when a structure is capable of being put in service shall be removed from the molds at the time of removal of form work.		Field curing shall be in accordance with AASHTO R100 (ASTM C 31). Store cylinders in or on the structure as near as practical to the represented concrete. Protect all surfaces of the cylinders from the elements and ensure a temperature and moisture environment similar to the formed work. To meet these conditions specimens made for the purpose of determining when a structure is capable of being put in service shall be removed from the molds at the time of removal of form work.

	Compressive test specimens for field cures may consist of one or more sets for either 6x12 cylinders or 4x8 cylinders.		Compressive test specimens for field cures may consist of one or more sets for either 6x12 cylinders or 4x8 cylinders.

Smithk: Updated CM website link (for increased security)

2021-10-22T15:09:53Z

Updated CM website link (for increased security)

← Older revision		Revision as of 10:09, 22 October 2021
Line 603:		Line 603:
	:(k) Batch weight of water.		:(k) Batch weight of water.

	To aid the contractor in submitting concrete mix designs to the district for approval, there is a [~~http~~://epg.modot.~~mo.gov~~/forms/CM/Concrete%20Mix%20Design%20Submittal%20Form.xls concrete mix design submittal form] which may be used by the contractor. This form contains all of the required information needed for the mix design to be evaluated. This form can be accessed by MoDOT personnel in SharePoint at [http://sp/sites/CM/FormServerTemplates/Concrete%20Mix%20Design%20Submittal%20Form.xls Concrete Mix Design Submittal Form].		To aid the contractor in submitting concrete mix designs to the district for approval, there is a [https://epg.modot.org/forms/CM/Concrete%20Mix%20Design%20Submittal%20Form.xls concrete mix design submittal form] which may be used by the contractor. This form contains all of the required information needed for the mix design to be evaluated. This form can be accessed by MoDOT personnel in SharePoint at [http://sp/sites/CM/FormServerTemplates/Concrete%20Mix%20Design%20Submittal%20Form.xls Concrete Mix Design Submittal Form].

	===501.2.4 District Procedures===		===501.2.4 District Procedures===

Smithk at 17:11, 24 September 2021

2021-09-24T17:11:58Z

Smithk: /* 501.2.3 Mix Design Information */ Per CM, replaced archaic V:drive info with eProject info

2021-09-24T17:08:28Z

501.2.3 Mix Design Information: Per CM, replaced archaic V:drive info with eProject info

← Older revision		Revision as of 12:08, 24 September 2021
Line 603:		Line 603:
	:(k) Batch weight of water.		:(k) Batch weight of water.

	To aid the contractor in submitting concrete mix designs to the district for approval, there is a [http://modot.mo.gov/~~business~~/~~materials~~/Concrete%20Mix%20Design%20Submittal%20Form.xls concrete mix design submittal form] which may be used by the contractor. This form contains all of the required information needed for the mix design to be evaluated. This form can be accessed by MoDOT personnel at V:~~\Reports Master SpreadSheets\~~Concrete Mix Design Submittal Form.		To aid the contractor in submitting concrete mix designs to the district for approval, there is a [http://epg.modot.mo.gov/forms/CM/Concrete%20Mix%20Design%20Submittal%20Form.xls concrete mix design submittal form] which may be used by the contractor. This form contains all of the required information needed for the mix design to be evaluated. This form can be accessed by MoDOT personnel in SharePoint at [http://sp/sites/CM/FormServerTemplates/Concrete%20Mix%20Design%20Submittal%20Form.xls Concrete Mix Design Submittal Form].

	===501.2.4 District Procedures===		===501.2.4 District Procedures===

← Older revision		Revision as of 12:11, 24 September 2021
Line 34:		Line 34:

	===501.1.2 Mix Design (Sec 501.3)===		===501.1.2 Mix Design (Sec 501.3)===
	The contractor shall design and submit all concrete mixes to ~~District~~ Materials for review		The contractor shall design and submit all concrete mixes to district Materials for review
	and approval. The mix shall be designed by absolute volume methods or an optimized mix		and approval. The mix shall be designed by absolute volume methods or an optimized mix
	design. Optimized refers to a well graded combined aggregate gradation resulting in lower water		design. Optimized refers to a well graded combined aggregate gradation resulting in lower water
Line 576:		Line 576:

	===501.2.2 Mix Design Procedures===		===501.2.2 Mix Design Procedures===
	Portland cement concrete mix designs will be reviewed by ~~District~~ Materials for specification compliance. The ~~District~~ will approve concrete mix designs complying with the specifications and meeting the guidelines outlined in this guidance. After reviewing the concrete mix, the ~~District~~ will prepare a letter advising the contractor whether the concrete mix has been approved or rejected. A copy of the approved concrete mix shall be sent to the Materials Field Office (See [[media:501 Format for Concrete Mixes.pdf\|example format]]).		Portland cement concrete mix designs will be reviewed by district Materials for specification compliance. The district will approve concrete mix designs complying with the specifications and meeting the guidelines outlined in this guidance. After reviewing the concrete mix, the district will prepare a letter advising the contractor whether the concrete mix has been approved or rejected. A copy of the approved concrete mix shall be sent to the Materials Field Office (See [[media:501 Format for Concrete Mixes.pdf\|example format]]).

	===501.2.3 Mix Design Information===		===501.2.3 Mix Design Information===
Line 606:		Line 606:

	===501.2.4 District Procedures===		===501.2.4 District Procedures===
	When a Portland cement concrete mix has been received by the ~~District~~, the ~~District~~ will check the calculations thoroughly and ensure that the materials listed and sieve analysis shown are correct and that the proposed proportions comply with Specifications. It may be necessary for the ~~District~~ to advise the contractor to make adjustments to their mix design in order to comply with the Specifications.		When a Portland cement concrete mix has been received by the district, the district will check the calculations thoroughly and ensure that the materials listed and sieve analysis shown are correct and that the proposed proportions comply with Specifications. It may be necessary for the district to advise the contractor to make adjustments to their mix design in order to comply with the Specifications.

	====501.2.4.1 Portland Cement====		====501.2.4.1 Portland Cement====
Line 855:		Line 855:

	===501.2.5 Laboratory Mix Verification===		===501.2.5 Laboratory Mix Verification===
	If during the review process the ~~District~~ identifies a concrete mix that needs further evaluation, the concrete mix may be sent to the Materials Field Office for further evaluation and possibly mix verification, if deemed necessary. A copy of the mix design and the contractor’s request letter shall be submitted to the Materials Field Office accompanied by a letter of transmittal outlining the reasons the mix needs further evaluation. When possible, the concrete mix and correspondence should be transmitted electronically. The Materials Field Office e-mail address is MFO.		If during the review process the district identifies a concrete mix that needs further evaluation, the concrete mix may be sent to the Materials Field Office for further evaluation and possibly mix verification, if deemed necessary. A copy of the mix design and the contractor’s request letter shall be submitted to the Materials Field Office accompanied by a letter of transmittal outlining the reasons the mix needs further evaluation. When possible, the concrete mix and correspondence should be transmitted electronically. The Materials Field Office e-mail address is MFO.

	====501.2.5.1 Trial Batch====		====501.2.5.1 Trial Batch====
Line 907:		Line 907:
	\|'''See also:''' [https://www.modot.org/research-publications Research Publications]		\|'''See also:''' [https://www.modot.org/research-publications Research Publications]
	\|}		\|}
	The use of approved high range water reducers and non-chloride accelerators will be permitted for use in precast concrete having a minimum cement content of 564 pounds and no other specific air or slump mix requirements, if approved by the ~~district~~ Operations Engineer except for concrete pipe. Requests for additives to concrete pipe should be directly to the State Construction and Materials Engineer.		The use of approved high range water reducers and non-chloride accelerators will be permitted for use in precast concrete having a minimum cement content of 564 pounds and no other specific air or slump mix requirements, if approved by the District Operations Engineer except for concrete pipe. Requests for additives to concrete pipe should be directly to the State Construction and Materials Engineer.

	'''501.2.6.1''' The producer shall furnish a mix design to the District Operations Engineer, for approval, which shall indicate the batch weights, including the amount of admixture(s) to be used.		'''501.2.6.1''' The producer shall furnish a mix design to the District Operations Engineer, for approval, which shall indicate the batch weights, including the amount of admixture(s) to be used.
Line 915:		Line 915:
	'''501.2.6.3''' The accelerators shall be of the non-chloride type.		'''501.2.6.3''' The accelerators shall be of the non-chloride type.

	'''501.2.6.4''' The supplier of the high range water reducer shall furnish for the ~~district~~ Operation Engineer’s file, a certification stating the admixture being furnished is considered to be compatible with the other admixtures (i.e. air entrainment, retarded, accelerator, etc. by brand name) being used in the mixture. Any changes in sources of admixture will require a re-submittal of the certification.		'''501.2.6.4''' The supplier of the high range water reducer shall furnish for the District Operation Engineer’s file, a certification stating the admixture being furnished is considered to be compatible with the other admixtures (i.e. air entrainment, retarded, accelerator, etc. by brand name) being used in the mixture. Any changes in sources of admixture will require a re-submittal of the certification.

	'''501.2.6.5''' A copy of the approval of the mix design using the above admixtures shall be submitted to the State Construction and Materials Engineer.		'''501.2.6.5''' A copy of the approval of the mix design using the above admixtures shall be submitted to the State Construction and Materials Engineer.
Line 922:		Line 922:
	Class A-1 Concrete was created for prestress work. It provides a smaller aggregate, which is necessary to accommodate the often-minimal clearance between forms and reinforcement, or within the reinforcement cage. It also provides additional cement to accommodate the water demand associated with the smaller rock, and to obtain faster strength gain. Class A-1 Concrete for work other than prestress may be modified as follows:		Class A-1 Concrete was created for prestress work. It provides a smaller aggregate, which is necessary to accommodate the often-minimal clearance between forms and reinforcement, or within the reinforcement cage. It also provides additional cement to accommodate the water demand associated with the smaller rock, and to obtain faster strength gain. Class A-1 Concrete for work other than prestress may be modified as follows:

	'''501.2.7.1''' Gradation D stone may be substituted for Gradation E stone, when the piece being cast does not have clearance problems that might cause Gradation D stone to bridge and cause voids or low density areas within the piece. When the ~~District~~ and the precaster are in agreement on the desirability of the Gradation D substitution, Construction and Materials shall be contacted with the proposal.		'''501.2.7.1''' Gradation D stone may be substituted for Gradation E stone, when the piece being cast does not have clearance problems that might cause Gradation D stone to bridge and cause voids or low density areas within the piece. When the district and the precaster are in agreement on the desirability of the Gradation D substitution, Construction and Materials shall be contacted with the proposal.

	'''501.2.7.2''' Construction and Materials will review the proposal and will approve or disapprove the substitution of Gradation D stone for Gradation E stone in the designated application.		'''501.2.7.2''' Construction and Materials will review the proposal and will approve or disapprove the substitution of Gradation D stone for Gradation E stone in the designated application.
Line 929:		Line 929:

	===501.2.8 Testing Equipment===		===501.2.8 Testing Equipment===
	All Quality Control (QC) testing shall be performed on QC test equipment. Quality Assurance (QA) testing shall be performed on QA test equipment. QC tests shall not be performed using QA testing equipment and QA tests shall not be performed using QC testing equipment. QA samples may be submitted to the Central Laboratory for testing if the ~~District~~ does not have the necessary testing equipment.		All Quality Control (QC) testing shall be performed on QC test equipment. Quality Assurance (QA) testing shall be performed on QA test equipment. QC tests shall not be performed using QA testing equipment and QA tests shall not be performed using QC testing equipment. QA samples may be submitted to the Central Laboratory for testing if the district does not have the necessary testing equipment.

	===501.2.9 Aluminum Powder===		===501.2.9 Aluminum Powder===