Mechanical strengths and durability properties of pervious concretes with blended steel slag and natural aggregate
Mechanical strengths and durability properties of pervious concretes with blended steel slag and natural aggregate
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DOI：
10.1016/j.jclepro.2020.122590
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发表时间：
2020-10
影响因子：
11.1
通讯作者：
Shunxiang Wang;Guofang Zhang;Bo Wang;Min Wu
中科院分区：
文献类型：
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作者：
Shunxiang Wang;Guofang Zhang;Bo Wang;Min Wu
采用钢渣（SS）替代天然骨料（NA）配制透水混凝土（PC），研究了其主要性能。SS的替代水平分别为25%、50%、75%和100%。研究了聚碳酸酯的抗压强度、劈裂抗拉强度、抗折强度、体积密度、连通孔隙率和透水系数等性能。此外，还对PC的耐碳化性和耐磨性进行了评价。结果表明，随着SS置换量的增加，PC的体积密度、连通孔隙率和透水系数总体呈增加趋势。结果表明，SS的加入对PC的抗压强度、劈拉强度和弯曲强度的提高有积极的作用。所有的PC都表现出优异的抗碳化性能。此外，PC纳入SS表现出更好的耐磨性比对照混合物。SEM图像显示，与掺NA的PC相比，掺SS的PC中水泥水化产物发育良好，且与SS结合较紧密。碳酸化后观察到大量CaCO3的形成。一般来说，钢渣可以作为替代骨料，以取代天然骨料制备PC。
Steel slag (SS) was used to replace natural aggregate (NA) in pervious concretes (PCs) and important properties of the PCs were investigated in this work. The replacement levels of SS were 25%, 50%, 75% and 100%, respectively. The properties of the PCs, including the compressive strength, the splitting tensile strength and the flexural strength as well as the bulk density, the connected porosity and the water permeability coefficient, were studied. Additionally, the carbonation resistance and the abrasion resistance of the PCs were also evaluated. It is found that the bulk density, the connected porosity and the water permeability coefficient of the PCs increase with SS replacement level overall. Incorporating SS shows positive effects on the development of compressive strength, splitting tensile strength and flexural strength of the PCs. All the PCs show excellent carbonation resistance. Moreover, the PCs incorporating SS exhibit better abrasion resistance than the control mix. SEM images reveal that the hydrates of cement develop well in the PCs incorporating SS and rather tightly link with SS, compared with the PCs incorporating NA. The formation of a significant amount of CaCO3is observed after carbonation. In general, steel slag can be used as alternative aggregate to replace natural aggregate in preparing PCs.