机制砂与天然砂的性能对比及在泵送混凝土中的应用困境

Comparison of Performance between Mechanized Sand and Natural Sand and Application Dilemma in Pumped Concrete

文中首先介绍了机制砂的由来与发展趋势,以及泵送混凝土中砂的选取。随后,重点从定义、规格、等级和特点、配置要求、颗粒级配、原料和粒型、自身特点、配制出的混凝土的特点、检验标准,应用标准等各个方面研究和总结了机制砂。再从石粉含量、组成结构、细度模数、黏合性和抗压性等四个方面对比分析了机制砂和天然砂的区别。最后,针对超高层泵送混凝土中对砂的性能要求,给出了泵送混凝土砂的选用办法,最后针对机制砂中一些待研究的问题给出了相应的建议。

This article first introduces the origin and development trend of manufactured sand,as well as the selection of sands in pumped concrete.Subsequently,the focus was on researching and summarizing manufactured sand from various aspects such as definition,specifications,grades and characteristics,configuration requirements,particle size distribution,raw materials and particle types,their own characteristics,characteristics of the prepared concrete,inspection standards,application standards,etc.The differences between manufactured sand and natural sand are compared from four following aspects:stone powder content,composition structure,fineness modulus,adhesion and compression resistance.Finally,in response to the performance requirements for sands in pumped concrete for super high-rise buildings,a selection method for sands in pumped concrete for super high-rise buildings is provided.Finally,corresponding suggestions are given for some issues to be studied in manufactured sand.