Abstract

In the present study, the effect of simultaneous use of different non-conventional water types and zeolite percentages on the compressive strength of concrete was investigated. The experiment was conducted in two cement contents for long-term curing ages up to 365 days. Finally, data of 1176 cubic samples were statistically analyzed. Also, the relationship between water type, zeolite percentage, cement content, and curing age as independent variables and compressive strength of concrete as the dependent variable was extracted by the single and multiple linear regressions. Dummy coding was used in the regression procedure. Results showed that despite the significant decreasing effect of zeolite on the compressive strength of concrete in low cement content, a negative effect on this property was not seen up to zeolite usage 20% in high cement content. Also, while in low cement content, the use of all types of non-conventional water led to an increase in the compressive strength of concrete, in the high cement content, this property was reduced within the permissible limit of 10% by all types of non-conventional mixing water. Three-way interaction of zeolite percentage, water type and cement content on compressive strength of concrete revealed that negative effect of the simultaneous use of zeolite and non-conventional water compared to the condition of tap water and without zeolite usage mostly was less in the cement content 350 Kg.m⁻³ than 250 Kg.m⁻³. Finally, it was concluded that permissible limits of mixing water impurities of which are presented in the different standards possibly have not adequately credited for all conditions.

摘要

在本研究中，研究了同时使用不同的非常规水类型和沸石百分比对混凝土抗压强度的影响。该实验在两种水泥含量中进行，长期养护年龄可达 365 天。最后对1176个立方样本的数据进行统计分析。此外，通过单次和多元线性回归，提取了作为自变量的水类型、沸石百分比、水泥含量和养护年龄与作为因变量的混凝土抗压强度之间的关系。在回归过程中使用了虚拟编码。结果表明，尽管沸石对低水泥含量混凝土的抗压强度有显着的降低作用，在高水泥含量中使用高达 20% 的沸石时，没有看到对这一特性的负面影响。此外，虽然在低水泥含量下，所有类型的非常规水的使用导致混凝土的抗压强度增加，但在高水泥含量下，所有类型的混凝土在允许的 10% 范围内降低了这一性能。非常规混合水。沸石含量、水的类型和水泥含量对混凝土抗压强度的三元交互作用表明，与自来水和不使用沸石的条件相比，同时使用沸石和非常规水的负面影响在水泥中较小。含量 350 Kg.m 在水泥含量高的情况下，该性能在所有类型的非常规混合水的允许范围内降低了 10%。沸石含量、水的类型和水泥含量对混凝土抗压强度的三元交互作用表明，与自来水和不使用沸石的条件相比，同时使用沸石和非常规水的负面影响在水泥中较小。含量 350 Kg.m 在水泥含量高的情况下，该性能在所有类型的非常规混合水的允许范围内降低了 10%。沸石含量、水的类型和水泥含量对混凝土抗压强度的三元交互作用表明，与自来水和不使用沸石的条件相比，同时使用沸石和非常规水的负面影响在水泥中较小。含量 350 Kg.m^-3大于 250 Kg.m ^-3。最后，得出的结论是，不同标准中规定的混合水杂质的允许限值可能并未充分考虑所有条件。