Abstract
Three full-scale instrumented test slabs were constructed and tested using a heavy vehicle simulator (HVS) to evaluate the structural behavior of internally cured concrete (ICC) for use in pavements under Florida condition. Three mix designs selected from a previous laboratory testing program include the standard mixture with 0.40 water-cement ratio, the ICC with 0.32 water-cement ratio, and the ICC mixture with 0.40 water-cement ratio. Concrete samples were prepared and laboratory tests were performed to measure strength, elastic modulus, coefficient of thermal expansion and shrinkage properties. The environmental responses were measured using strain gages, thermocouples, and linear variable differential transformers instrumented in full-scale concrete slabs. A 3-D finite element model was developed and calibrated using strain data measured from the full-scale tests using the HVS. The results indicate that the ICC slabs were less susceptible to the change of environmental conditions and appear to have better potential performance based on the critical stress analysis.
Highlights
1.1 Background In recent years, the high-strength-high-performance concrete (HSHPC) has been widely used for a rapid repair of concrete bridge decks and concrete pavements
One is based on the use of light-weight aggregate (LWA), while the other is the use of superabsorbent polymers (SAP)
1.2 Objectives and Scope The primary objective of this study is to evaluate the performance and applicability of the internally cured concrete (ICC) using lightweight aggregates (LWAs) for use in pavements under Florida conditions using a laboratory and a full-scale field testing program
Summary
1.1 Background In recent years, the high-strength-high-performance concrete (HSHPC) has been widely used for a rapid repair of concrete bridge decks and concrete pavements. Since the internal curing agents are a highly porous material, an each particle of internal curing agent acts like a small reservoir inside the concrete when it is saturated This will provide water to the surrounding cement paste during the hydrating period. The ICC has been successfully used for a pavement project in Hutchins, Texas (Villarreal and Crocker 2007) They found that internal curing pavement achieved 7-day flexural strength up to 90–100 % of the required 28-day flexural strength due to an improved hydration process. 1.2 Objectives and Scope The primary objective of this study is to evaluate the performance and applicability of the ICC using lightweight aggregates (LWAs) for use in pavements under Florida conditions using a laboratory and a full-scale field testing program. A three-dimensional FE analysis was conducted to assess the potential performance of the ICC
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