Physical and Mechanical Characterization of Sustainable and Innovative Porous Concrete for Urban Pavements Containing Metakaolin

被引:14
作者
Elizondo-Martinez, Eduardo-Javier [1 ]
Tataranni, Piergiorgio [2 ]
Rodriguez-Hernandez, Jorge [1 ]
Castro-Fresno, Daniel [1 ]
机构
[1] Univ Cantabria, GITECO Res Grp, Avda Castros S-N, Santander 39005, Spain
[2] Univ Bologna, DICAM Dept, Via Terracini 28, I-40131 Bologna, Italy
关键词
porous concrete; metakaolin; geopolymers; permeable pavements; urban drainage systems; PERVIOUS CONCRETE;
D O I
10.3390/su12104243
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Alternative materials to replace cement in pavements have recently been widely studied with the purpose of decreasing the environmental impacts that the construction industry generates. In this context, the implementation of sustainable urban drainage systems has grown, especially with porous pavements, with the intention to reduce water and environmental impacts. In the present investigation, the addition of alternative materials to minimize the use of cement in porous concrete pavements is evaluated. Starting from a partial substitution of Portland cement with metakaolin, experimental geopolymer concretes were produced with metakaolin and waste basalt powder according to several dosages. Two sets of mixtures were analyzed to evaluate the Porous Concrete Design (PCD) methodology for porous concrete mixtures with alternative materials. A deep analysis was proposed for the evaluation of the mechanical and volumetric properties of the mixtures. Results demonstrated that replacing 5% of cement with metakaolin can increase both permeability and indirect tensile strength. Geopolymer mixtures can achieve permeability significantly higher than the traditional porous concrete, but this decreases their indirect tensile strength. However, considering the promising results, an adjustment in the mix design of the geopolymer mixtures could increase their mechanical properties without negatively affecting the porosity, making these materials a suitable alternative to traditional porous cement concrete, and a solution to be used in urban pavements.
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页数:13
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