Abstract
Permeable concrete pavements are designed to absorb rainfall, however they suffer from a number of challenges, which prevent their widespread adoption. Current permeable pavements are prone to clogging by sediments and have both low strength and durability. A clogging resistant permeable pavement (CRP, also known as Kiacrete) has been developed that has improved permeability, clogging resistance, strength and freeze–thaw durability. This paper reports on the performance of CRPs of the same open porosity made with different pore sizes, pore wall thicknesses and target entraining air content when exposed to 56 freeze–thaw cycles. The tests involved exposing samples to temperature varying from -20 °C to +20 °C and measuring changes in mass, ultrasonic pulse velocity, and compressive and flexural strength. The samples made with the Kiacrete tiles, which is the in-situ delivery method, were also vacuum impregnated and imaged using a stereomicroscope to determine the effect of target entrained air content and freeze–thaw cycles on microcracking. The results show that CRP is highly resistant to freeze–thaw degradation and no further addition of air entraining agent is required. The microcracks that occur do not have any notable impact on the overall durability performance. This study presents the first high strength clogging resistant permeable pavement that is highly durable under frost action, without requiring air entrainment inclusion, enabling permeable concrete pavements to be adopted in cold climates.
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