复掺白云石粉与粉煤灰混凝土力学性能试验研究  

Experimental study on mechanical properties of concrete mixed with dolomite powder and fly ash

作　　者：崔钊玮[1,2] 杨靖韬 刘荣桂[1] 顾斌[1] CUI Zhaowei;YANG Jingtao;LIU Ronggui;GU Bin(Faculty of Civil Engineering and Mechanics,Jiangsu University,Zhenjiang 212013,China;Capital Construction Division,Jiangsu University,Zhenjiang 212013,China;Centre Testing International of Suzhou Co.,Ltd.,Suzhou 215134,China)

机构地区：[1]江苏大学土木工程与力学学院,江苏镇江212013 [2]江苏大学基本建设处,江苏镇江212013 [3]苏州华测工程检测有限公司,江苏苏州215134

出　　处：《混凝土》2022年第12期96-99,109,共5页Concrete

基　　金：国家自然科学基金(51778272)。

摘　　要：为研究复掺白云石粉与粉煤灰对高性能混凝土力学性能的影响,系统开展了白云石粉取代水泥/粉煤灰用量的混凝土抗压强度、弹性模量以及干燥收缩等力学性能试验。基于比力学性能指标法,分析了白云石粉取代量对比抗压强度、比弹性模量以及比干燥收缩量及其对应的性能贡献率的影响。研究表明:(1)同一养护龄期下,混凝土比抗压强度与强度贡献率随着白云石粉取代水泥用量的增大呈现逐渐降低的趋势,随着白云石粉取代粉煤灰用量的增大呈现逐渐增大的趋势;(2)混凝土比弹性模量与弹性模量贡献率随着白云石粉取代水泥用量的增大呈现先增加后降低趋势,随着白云石粉取代粉煤灰用量的增大呈现先降低后增加趋势;(3)混凝土比干燥收缩量随着白云石粉取代水泥/粉煤灰用量的增加均呈现逐渐降低的趋势,且对干燥收缩贡献率一般小于零,可见白云石粉能够有效缓解混凝土干燥收缩。In order to study the influence of dolomite powder and fly ash on the mechanical properties of high-performance concrete,it systematically has carried out the tests of compressive strength,elastic modulus and drying shrinkage of concrete with dolomite powder instead of cement or fly ash.Based on the relative mechanical property index method,the effects of replacement amount of dolomite powder on relative compressive strength,relative elastic modulus,relative drying shrinkage and their corresponding contribution ratio of performance have been analyzed.The results show that(1)At the same curing age,the relative compressive strength and strength contribution rate of concrete gradually decrease with the increase of the amount of dolomite powder replacing cement,and gradually increase with the increase of the amount of dolomite powder replacing fly ash.(2)The relative elastic modulus and the contribution rate of elastic modulus of concrete increase first and then decrease with the increase of the amount of dolomite powder replacing cement,and decrease first and then increase with the increase of the amount of dolomite powder replacing fly ash.(3)The relative drying shrinkage of concrete tends to decrease with the increase of the amount of dolomite powder replacing cement or fly ash,and the contribution rate to drying shrinkage is generally less than zero.It can be seen that dolomite powder can effectively alleviate the drying shrinkage of concrete.

关 键 词：白云石粉 粉煤灰 混凝土 比力学性能指标 性能贡献率 

分 类 号：TU528.041[建筑科学—建筑技术科学]