Guidelines for Early-Opening-to-Traffic Portland Cement Concrete for Pavement Rehabilitation (2005) / Chapter Skim
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From page 5... ...
2.1.1 Constituent Materials For the most part, EOT concrete is composed of the same constituents as normal paving concrete. Coarse and fine aggregates are blended with portland cement, water, and admixtures to produce a stiff but moldable mass that hardens through a chemical process referred to as hydration.
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Standard specifications for blended hydraulic cements are provided in AASHTO M 240. These cements are formed by intimately blending portland cement with fine materials such as ground granulated blast-furnace slag, fly ash or other pozzolans, hydrated lime, and pre-blended cement combinations 6 of these materials (Kosmatka et al.
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200 Sieve and Mineral Aggregates by Washing AASHTO T 176: Plastic Fines in Graded Aggregates and Soils by the Use of the Sand Equivalent Test Aggregate shape, angularity, and texture AASHTO T 304: Uncompacted Void Content of Fine Aggregate AASHTO TP 56: Uncompacted Void Content of Coarse Aggregate (As Influenced by Particle Shape, Surface Texture, and Grading) ASTM D 4791: Test Method for Flat and Elongated Particles in Coarse Aggregate Aggregate thermal expansion AASHTO TP-60: Standard Test Method for the Coefficient of Thermal Expansion of Hydraulic Cement Concrete Aggregate abrasion CSA A23.2-23A: Resistance of Fine Aggregate to Degradation by Abrasion in the Micro-Deval Apparatus AASHTO TP 58: Resistance of Coarse Aggregate to Degradation by Abrasion in the Micro-Deval Apparatus AASHTO T 96: Resistance to Degradation of Small-Size Coarse Aggregate by Abrasion and Impact in the Los Angles Machine Elastic modulus ASTM C 469: Static Modulus of Elasticity and Poisson's Ratio of Concrete in Compression Polishing ASTM D 3042: Test for Acid Insoluble Residue in Carbonate Aggregates Aggregate strength British Standard 812 (Part 3)
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. In these publications, it is noted that EOT concrete repair materials use similar constituents and proportioning as normal paving concrete, except that higher cement contents and lower w/c ratios are common.
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specified for use in 6- to 8-hour EOT concrete mixtures. Admixtures commonly specified for use in 6- to 8-hour EOT concrete mixtures included air entrainers, accelerators, and water reducers.
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TABLE 4 Summary of SHA specifications for 6- to 8-hour EOT repair materials in 2000
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GGBFS: ground granulated blast furnace slag. HES: high early strength.
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All of the 11 states required use of Type I, II, or III portland cement for the 20- to 24-hour EOT concrete. The specified minimum cement content ranged from 335 to 502 kg/m3 (564 to 846 lb/yd3)
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From page 13... ...
This might not be a desirable outcome for EOT concrete repairs where heat generated by solar radiation accelerates hydration and thus early strength gain. Concrete repairs located in mountainous and arid climates may require heavier dosage rates of resin-based curing compound meeting AASHTO M 148, Type 2, Class B requirements.
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