Using Natural Pozzolans to Partially Replace Cement in Pervious Concretes: A Sustainable Alternative?

Concrete is one of the most widely used construction materials all around globe. Associated with urban expansion, concrete pavements increase impermeable surfaces that affect hydrological cycle and generate heat islands. Cement main components concrete, its production sources worldwide CO2 emissions. Pervious partial cement replacement represents a more sustainable alternative. In this paper, use natural pozzolans zeolite pumicite, as in pervious mixtures, analyzed. The mechanical hydraulic properties concretes using different percentages pumicite to replace (0% 20%) were evaluated by series tests on compressive strength, flexural permeability, porosity, microanalysis SEM for samples. Additionally, experiments plasticizer additive conducted. results show mixtures 0.35 W/C ratio present better properties; shows performance than zeolite, achieved at 10% replacement; addition increased final strengths. It recommended partially adding consider 0.7% plasticizer.