磨细凝灰岩制备机制砂混凝土力学性能研究  

Mechanical Properties of Machine-made Sand Concrete Prepared from Finely Ground Tuff

作　　者：夏益健 张宇 张云升 朱微微[3] 朱文轩 XIA Yijian;ZHANG Yu;ZHANG Yunsheng;ZHU Weiwei;ZHU Wenxuan(School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Gansu Advanced Civil Engineering Materials Engineering Research Center,Lanzhou 730050,China;School of Materials Science and Engineering,Southeast University,Nanjing 211189,China)

机构地区：[1]兰州理工大学土木工程学院,兰州730050 [2]甘肃省先进土木工程材料工程研究中心,兰州730050 [3]东南大学材料科学与工程学院,南京211189

出　　处：《材料导报》2025年第9期67-73,共7页Materials Reports

基　　金：国家自然科学基金(52208249,U21A20150,52208292);甘肃省青年科学基金(22JR5RA288);甘肃省高等学校自然科学创新基金(2022CYZC-25);甘肃省绿色智慧公路关键技术示范项目(21ZD3GA002);公路混凝土桥梁耐久性关键技术,高性能土木工程材料国家重点实验室(2022CEM009)。

摘　　要：本工作研究凝灰岩石粉掺量(0%、10%、20%、30%、40%)、细度(5.58%、6.98%、7.56%和9.23%)和复掺粉煤灰、矿粉对机制砂混凝土工作性能、抗压和抗折强度的影响。利用SEM、XRD、NMR等分析技术研究了掺凝灰岩石粉混凝土的水化产物和孔结构。试验结果表明:随着凝灰岩石粉掺量增加,混凝土坍落度呈先增大后减小的趋势,抗压与抗折强度下降,孔径增大;凝灰岩石粉细度对混凝土工作性能与抗压、抗折性能影响较小;复掺粉煤灰和矿粉可以提升混凝土28 d力学强度,增加小孔的数量,但由于粉煤灰与矿粉级配分布较大,大孔的数量也随之增加。In this work,the variation of working performance,compressive and flexural strength of machine-made sand concrete were studied through the changes in gelation composition such as tuff powder content(0%,10%,20%,30%,40%),tuff powder fineness(5.58%,6.98%,7.56%and 9.23%)and compound mixing of fly ash and mineral powder.SEM,XRD,NMR and other analytical techniques were used to study the hydration products and pore structure of tuff-mixed pulverized concrete.The test results show that as the amount of tuff powder increases,the slump of concrete increases first and then decreases,the compressive and flexural strength decreases,and the pore size increases greatly.The fineness of tuff powder has a slight effect on the working performance,compressive and flexural properties.The compound mixing of fly ash and mineral powder can improve the mechanical strength of concrete of 28 d and increase the number of small holes,but the number of large holes also increases due to the large gradation distribution of fly ash and mineral powder.

关 键 词：凝灰岩 机制砂混凝土 力学性能 石粉 

分 类 号：TU528[建筑科学—建筑技术科学]