Mechanical properties of high-volume fly ash roller compacted concrete designed by maximum density method
Mechanical properties of high-volume fly ash roller compacted concrete designed by maximum density method
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DOI：
10.1016/j.conbuildmat.2012.07.109
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发表时间：
2013
影响因子：
7.4
通讯作者：
A. Mardani‐Aghabaglou;K. Ramyar
中科院分区：
文献类型：
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作者：
A. Mardani‐Aghabaglou;K. Ramyar
为了研究高掺量粉煤灰对碾压混凝土力学性能的影响，除了不含粉煤灰的对照混合料外，在两个不同系列的混合料中部分水泥或骨料被粉煤灰替代。使用最大密度法设计的所有混合物的最大骨料尺寸均为25mm。对照混合物的水泥含量为250kg/m3。在一系列混合物中，20、40 和 60wt% 的水泥被粉煤灰替代。在另一个系列中，部分骨料（相当于水泥的 20、40 和 60wt%）被粉煤灰替代。总共制备了28种具有四种不同的水/粘合剂比例（0.30、0.35、0.4和0.45）的混合物。其中，选择了七种含水量最佳的混合物进行进一步研究。据观察，在用粉煤灰代替水泥的混合物中，增加粉煤灰含量会导致所有龄期（甚至长达 180 天）的抗压强度、劈裂拉伸强度和弯曲强度值降低。另一方面，当骨料被粉煤灰替代时，与对照样品相比，增加粉煤灰含量会增加所有龄期的混合物的强度值。
In order to study the effect of high volume fly ash on mechanical properties of roller compacted concrete, in addition to control mixture containing no fly ash, in two different series of mixtures cement or aggregate was partially replaced with fly ash. The maximum aggregate size was 25mm in all of the mixtures which were designed using maximum density method. The cement content of the control mixture was 250kg/m3. In one series of the mixtures 20, 40 and 60wt% of cement was replaced with fly ash. In another series, a part of aggregate (equal to 20, 40 and 60wt% of cement) was replaced with fly ash. Totally 28 mixtures having four different water/binder ratios (0.30, 0.35, 0.4 and 0.45) were prepared. Among these, seven mixtures containing optimum water content were selected for further research. It was observed that in the mixtures where cement was substituted with fly ash, increasing the fly ash content caused reduction in compressive, splitting tensile and flexural strength values at all of the ages up to even 180days. On the other hand, when aggregate was replaced with fly ash, increasing the fly ash content increased the strength values of the mixture at all ages compared to these of the control specimen.