泥水盾构隧道砂的特性及其在大流量混凝土中的应用

Properties of Slurry Shield Tunnel Sand and Its Application in Large Flow Concrete.

作者信息

Ke Zierkailedi Ba Hezhuoli, Bian Libo, Wang Xiufang, Hu Xingbo, Liu Xuelei, Zhang Zhi

机构信息

School of Civil and Traffic Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China.

Beijing Shou Fa Tian Ren Ecological Landscape Co., Ltd., Beijing 100000, China.

出版信息

Materials (Basel). 2022 Jul 23;15(15):5131. doi: 10.3390/ma15155131.

DOI:10.3390/ma15155131

PMID:35897564

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9330569/

Abstract

The amount of Slurry shield tunnel slag (SSTS) from the Beijing East Sixth Ring Road renovation project is about 3 million m, and it is mainly fine and silt sand. In order to realize its resource utilization, the properties of SSTS and the performance of concrete with strength grades from C30-C60, which used the mixed sand compound with SSTS and Coarse Manufactured Sand (CMS) as a fine aggregate, were investigated. The results showed that SSTS' fineness modulus is 1.2, its clay content is 17.0% but its composition is mainly Inert Silt (IS), and SSTS replaced with 40% of the mass of CMS can obtain a mixed sand with a fineness modulus of 2.7 and a clay content of 7.0%. The morphological and filling effects of SSTS and IS will improve the workability and durability properties of concrete with no adverse effects on the compressive strength. On the other hand, clay lumps in SSTS adversely affect the workability, early cracking properties, and freeze resistance of concrete, which can be alleviated by dewatering and crushing the clay lumps in SSTS.

摘要

北京东六环改造工程产生的泥水盾构隧道渣土（SSTS）量约为300万立方米，主要为细砂和粉砂。为实现其资源利用，对SSTS的性能以及以SSTS与机制粗砂（CMS）混合砂为细骨料的C30 - C60强度等级混凝土的性能进行了研究。结果表明，SSTS的细度模数为1.2，含泥量为17.0%，但其成分主要为惰性粉土（IS），用40%质量的CMS替代SSTS可得到细度模数为2.7、含泥量为7.0%的混合砂。SSTS和IS的形态及填充效应将改善混凝土的工作性和耐久性，且对抗压强度无不利影响。另一方面，SSTS中的黏土块对混凝土的工作性、早期开裂性能和抗冻性有不利影响，可通过对SSTS中的黏土块进行脱水和破碎来缓解。