Category:1007 Aggregate for Base

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Revision as of 10:44, 13 March 2009 by Smithk (talk | contribs) (Per Physical Laboratory, this article was revised to agree with current MoDOT specs and to update the Lab portion to match current practice)
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This article establishes procedures for the inspection, sampling and acceptance of aggregate for base material specified in Sec 1007.

1007.1 Procedure

Inspection, testing and sampling will be governed by the instructions contained in General Requirements for Material.

Field tests required are as follows:

Table 1007

Test Template Template Description
Sieve Analysis T27 Sieve Analysis of Fine and Coarse Aggregate
Percent Deleterious SAA001Fx* NEWEST Deleterious 1007 Aggregate
Compaction SAA203Ax* NEWEST Field Soils/Aggregate Compaction
Plasticity Index SAA008Ax* NEWEST Aggregate Plasticity Index
* Test Template numbers have been depicted with a generic ‘x’ as some templates are updated and the last letter in the template name may change. The most current template for a template sequence should contain ‘NEWEST’ at the beginning of the template name.

Samples required for Laboratory tests are as follows:

(a) Initial Evaluation required if material has never been tested before.
(b) Compaction Standard
MGS Information
Current General Services Specifications (MGS) By Subject

1007.2 Acceptance

Acceptance is based on routine tests in the field to ensure compliance with Sec 1007. Samples are to be taken at destination or at the source of aggregate production by MoDOT inspectors at intervals of one per 2,000 tons.

1007.3 Records and Reports

All plant records shown in General Requirements for Material - Records and Reports shall be maintained. A sample record of aggregate inspection shall be created in SiteManager.

1007.4 Laboratory Testing for Sec 1007

1007.4.1 Types of Samples Tested

1007.4.1.1 Initial Approval Sample

Tests consist of specific gravity, absorption and Los Angeles abrasion. The minimum time required for completion of tests is four working days from the date received. Test results and calculations shall be recorded through SiteManager.

1007.4.1.2 Compaction Standard

Tests consist of sieve analysis, maximum density, optimum moisture and plasticity index. The minimum time required for completion of this test is 5 days from the date received. Test results and calculations shall be recorded through SiteManager.

1007.4.2 Procedure

1007.4.2.1 Sieve Analysis

Aggregate shall be tested in accordance with AASHTO T 27.

1007.4.2.2 Specific Gravity and Absorption

Aggregate shall be tested in accordance with AASHTO T 85 for specific gravity.

1007.4.2.3 Los Angeles Abrasion

Aggregate shall be tested in accordance with AASHTO T 96.

1007.4.2.4 Plasticity Index

The plasticity index is the numerical difference between the liquid limit and plastic limit of the material.

The liquid limit shall be determined in accordance with AASHTO T 89 Mechanical Method(Alternate).

The plastic limit shall be determined in accordance with AASHTO T 90.

1007.4.2.5 Compaction Standard

Aggregate shall be tested in accordance with AASHTO T 99, Method "C".

1007.4.2.6 Deleterious Content

The percentage of deleterious substances in coarse aggregate is to be determined according to TM-71, Deleterious Content of Aggregate. Where field determinations show a total deleterious content of 5.0 percent or less for Type 1 and 5 base aggregates, the deleterious content may be inspected visually. Otherwise, the sample is to be tested for deleterious content.

1007.4.3 Sample Record

The sample record shall be completed in SiteManager, as described in Automation Section 3510, and shall indicate acceptance, qualified acceptance, or rejection. Appropriate remarks, as described in Reporting Test Results, are to be included in the remarks to clarify conditions of acceptance or rejection. Test results shall be reported on the appropriate templates under the Tests tab.