论文部分内容阅读
由于再生细骨料在初次筛分后所含杂质较多,而且级配较粗细粉较多,直接应用于试验或是工程不能达到砂浆用砂的要求。所以本文在试验过程中必须首先对再生细骨料的杂质和级配进行处理。通过对再生细骨料和天然细骨料的各项基本性能的测定得出再生细骨料颗粒多棱角、表面粗糙、粒形较差、多裂纹、孔隙率高、吸水率大、堆积密度小,而且还含有大量的硬化水泥浆,再生细骨料的这些特点会造成再生砂浆性能或多或少的提高或降低。本文进行了不同再生细骨料以不同取代率取代天然砂来配制再生砂浆,并研究了再生砂浆的和易性和强度在不同取代率下的变化规律。试验结果表明再生细骨料应用于砂浆是可行的,而且试验结果与预期的再生砂浆的结果是相同的。
As the regenerated fine aggregate after the initial screening contains more impurities, and grading more coarse powder more directly applied to the test or project can not meet the requirements of sand mortar. Therefore, in this paper, we must first deal with the impurities and gradation of recycled fine aggregate. Through the determination of the basic properties of regenerated fine aggregates and natural fine aggregates, it is concluded that the regenerated fine aggregates have the advantages of multi-angularity, rough surface, poor grain shape, multiple cracks, high porosity, large water absorption and small bulk density , But also contains a large amount of hardened cement slurry, these characteristics of recycled fine aggregate will cause the performance of recycled mortar to increase or decrease more or less. In this paper, different regenerated fine aggregates were used to replace natural sand with different substitution rates to prepare recycled mortar, and the variation of workability and strength of recycled mortar under different substitution rates was studied. The test results show that the application of recycled fine aggregate to mortar is feasible, and the test results are the same as those of the expected recycled mortar.