凝灰岩型隧道洞砟机制砂混凝土和易性与力学性能研究

引用文献:

张广田 刘娟红 刘昆 付士峰 刘东基. 凝灰岩型隧道洞砟机制砂混凝土和易性与力学性能研究[J]. 建筑结构,2022,48(02):120-126.

ZHANG Guangtian LIU Juanhong LIU Kun FU Shifeng LIU Dongji. Study on workability and mechanical properties of tuff-typed tunnel ballast machine-made sand concrete[J]. Building Structure,2022,48(02):120-126.

作者:张广田 刘娟红 刘昆 付士峰 刘东基
单位:北京科技大学土木与资源工程学院 河北省建筑科学研究院有限公司;河北省固废建材化利用科学与技术重点实验室
摘要:利用杭绍台高速公路隧道洞砟,制备凝灰岩型机制砂,分析了机制砂及石粉特性,研究其对砂浆、混凝土流动性与强度的影响,利用条形筛检测机制砂中片状颗粒,探究不同片状颗粒含量对砂浆与混凝土和易性的影响规律,并研究不同砂率对C30与C35混凝土性能的影响。试验结果表明:凝灰岩型机制砂为硅质机制砂,表面的断键导致石粉易团聚,对亚甲蓝值不敏感,需水量大。随着石粉与片状颗粒含量的增加,砂浆与混凝土的流动性与强度不断降低。凝灰岩片状颗粒含量大于石灰岩片状颗粒含量对强度的影响程度,片状颗粒含量对低水胶比砂浆流动性及强度影响幅度大于高水胶比影响幅度。考虑混凝土的工作性和抗压强度,机制砂中石粉含量宜小于8%,片状颗粒含量宜小于10%,选定C30的砂率为43%,C35的砂率为41%。
关键词:凝灰岩,石灰岩机制砂,和易性,流动性,石粉,片状颗粒
作者简介:张广田,博士,高级工程师,主要从事固废资源化利用、高品质砂石、尾矿资源化利用等方面研究,Email:syzx1206@163.com。刘娟红,博士,教授,主要从事现代混凝土技术教学与研究,Email:juanhong1966@hotmail.com。
基金:国家自然科学基金面上项目(51678049);国家自然科学基金重点项目(51834001);河北省重点研发计划(19274104D)。
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Study on workability and mechanical properties of tuff-typed tunnel ballast machine-made sand concrete
ZHANG Guangtian LIU Juanhong LIU Kun FU Shifeng LIU Dongji
(College of Civil and Resources, University of Science and Technology Beijing Hebei Academy of Building Research Hebei Province Science and Technology Key Laboratory of Solid Waste for Building Materials)
Abstract: Using the tunnel ballast of Hangzhou shaotai expressway, tuff-typed machine-made sand was prepared. The characteristics of machine-made sand and stone powder were analyzed, and their effects on the fluidity and strength of mortar and concrete were studied. Strip sieve was used to detect the flake particles in the machine-made sand and explore the influence of different flake particles contect on the workability of mortar and concrete, and the impact of different sand rates on concrete performance of C30 and C35 was studied. The test results show that the tuff-typed machine-made sand is siliceous machine-made sand, and the broken bond on the surface causes the stone powder to easily agglomerate, and it is not sensitive to the methylene blue value, and requires a large amount of water. As the content of stone powder and flaky particles increases, the fluidity and strength of mortar and concrete continue to decrease. The influence of contect of flake particles of tuff on the strength is greater than that of contect of limestone flake particles, and the influence of contect of flake particles on the fluidity and strength of mortar with low water-binder ratio is greater than that of high water-binder ratio. Considering the workability and compressive strength of concrete, the stone powder content in machine-made sand should be less than 8%, and the contect of flake particles should be less than 10%, and the selected C30 sand rate is 43%, and the C35 sand rate is 41%.
Keywords: tuff; limestone; machine-made sand; workability; flowability; stone powder; flake particle
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