Abstract
Concrete is prone to shrinkage thus induces pavement cracking at early age. In this study superabsorbent polymers (SAP) and basalt fibers are utilized in concrete for pavement to mitigate the shrinkage and cracking. The effect of different SAP meshes (particle sizes), SAP contents, absorption ratios, and fiber contents on the key properties, including compressive and flexural strength, dynamic elastic modulus, autogenous shrinkage, and permeability, were investigated. The mixture design parameters were optimized by the weighted grey target optimization method. The results showed that the concrete was able to increase 4.6% in compressive strength, 5.66% in dynamic elastic modulus, and decrease 50.52% in autogenous shrinkage and 38.45% in RCM coefficient by properly combined SAP and basalt fibers at 28 day. Based on microstructure observation results, the enhancement mechanism of SAP and basalt fibers on the concrete performance were analyzed. The combination of SAP and basalt fibers, which can provide internal curing effect and bridging effect, proved to be beneficial for the crack resistance and service life of the concrete pavement.
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