Freeze-Thaw Resistance of Field and Laboratory Produced Portland Cement Pervious Concrete

摘要

High porosity with interconnected voids between aggregate particles is the primary characteristic of Portland cement pervious concrete (PCPC), which endows it with many environmental-friendly functions. However, due to its open pore structures, significant reductions in the strength and durability are caused, and one of the main concerns and controversy topics of PCPC is its durability under extremely cold climates. In this study, the freeze-thaw resistance of field fabricated pervious concrete was investigated through laboratory experiments, and a PCPC pavement section was paved in a pedestrian road for the purpose. Vinyl acetate ethylene (VAE) copolymer latex, polypropylene fiber, and polycarboxylate superplasticizer (SP) were added in the mixtures expecting to improve the freeze-thaw resistance of pervious concrete. The testing results indicated that in a saturated condition the PCPC could still suffer from freezing and thawing damages. The mixtures with latex modified exhibited relatively higher freeze-thaw resistance than other mixtures due to the enhancement of cementitious matrix and bonding strength between aggregate particles. In addition, single-length fibers were found have no apparent influence on the porosity and freeze-thaw resistance of PCPC.