Interfacial interactions in lightweight aggregate concretes and their influence on the concrete strength
Interfacial interactions in lightweight aggregate concretes and their influence on the concrete strength
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DOI：
10.1016/0958-9465(96)00002-9
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发表时间：
1996
影响因子：
10.5
通讯作者：
R. Wasserman;A. Bentur
中科院分区：
文献类型：
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作者：
R. Wasserman;A. Bentur
为了解决集料强度以外的因素对水泥混凝土强度的影响，研究了粉煤灰轻集料与基体之间的相互作用。生产可变性能的骨料，制备等有效水灰比的混凝土，并测试其强度和微观结构。结果发现，混凝土强度的差异并不总是占骨料强度的差异。这些趋势可能与物理和化学界面过程有关，这些过程对总强度的影响超出了骨料强度。确定的物理过程是致密化的界面过渡区由于吸收的骨料，这个过程已经在早期的年龄有相当大的影响。的化学过程与火山灰活性的聚合物和沉积的CH在孔隙中的壳的聚合物，这些过程变得有效，只有在以后的年龄，超过28天。由于这些影响，强度的增强范围在20%至40%之间。在预测混凝土强度或设计具有最佳性能的轻骨料时，应考虑这些影响。
The interactions between sintered fly ash lightweight aggregates and the matrix in portland cement concretes was studied to resolve factors other than aggregate strength which influence the concrete strength. Aggregates of variable properties were produced and concretes of equal effective water cement ratio were prepared and tested for strength and microstructure. It was found that differences in concrete strength could not always be accounted for by differences in the aggregate strength. These trends could be related to physical and chemical interfacial processes, which have an influence on the overall strength beyond that of the aggregate strength. The physical process identified was densification of the interfacial transition zone due to absorption of the aggregates; this process has considerable influence already at early age. The chemical processes were associated with pozzolanic activity of the aggregate and deposition of CH in the pores in the shell of the aggregate; these processes became effective only at later age, beyond 28 days. The enhancement in strength due to these influences ranged between 20 and 40%. Such influences should be taken into account when predicting the concrete strength or in the design of lightweight aggregate of optimal properties.