Permeable concrete mixed with various admixtures

This paper presents the performance of permeable concrete mixed with various alternative construction materials such as fly ash, fibers, and tire chips subjected to instantaneous live load intensity representing traffic-induced distress. Attention is paid to load-bearing capacity and hydraulic characteristics that affect the functionality of these concrete mixtures. Two test categories are examined depending upon the presence of fly ash and each category encompasses seven specimens with a combination of the admixture materials. Experimental results show that the inclusion of fly ash and tire chips decreases the load-carrying capacity of the permeable concrete, whereas that of fibers increases the capacity. The infiltration rate of the concrete is improved by the fibers and the degree of improvement is reliant upon their geometric configurations. Tire chips tend to clog pores and decreases infiltration. The instantaneous load intensity causes significant degradation in hydraulic conductivity, Reynolds number, and infiltration rate; particularly critical when mixed with fly ash. Predictive approaches based on multiple-regression and reliability theory provide useful information on achieving the sustainable design and practice of permeable concrete with the admixtures. (C) 2016 Elsevier Ltd. All rights reserved.