摘要
为研究高吸附性的花岗斑岩石粉含量对机制砂混凝土性能的影响,对5组不同石粉含量的混凝土和易性能、收缩性能、抗开裂性能、抗压强度和抗氯离子渗透性能进行了测试与分析,并通过MIP与SEM试验,研究了不同石粉含量的机制砂混凝土的微观结构。试验结果表明:高吸附性的花岗斑岩石粉对混凝土性能及微观结构的影响与石灰石粉存在一些不同之处,混凝土需水量随石粉含量的增加而提高,早龄期收缩率随石粉含量的增加而增大;石粉含量小于8%时,混凝土抗裂性能、抗压强度和抗氯离子渗透性能随石粉含量的增加得到改善,花岗斑岩石粉对混凝土微观结构性能的影响以“填充”、“成核”作用为主,微观结构性能随石粉含量增加而提高,石粉含量的增加有利于混凝土力学性能和耐久性能的发展;但当石粉含量超过8%时,混凝土抗裂性能和抗氯离子渗透性随石粉含量的增加而降低,抗压强度随石粉含量的不断增加出现大幅度的波动,花岗斑岩石粉对混凝土微观结构性能的影响趋向于“多元化”,石粉含量的增加已不利于混凝土力学性能与耐久性能的发展。
In order to study the effect of the content of high-adsorption granite porphyry powder on the performance of manufactured sand concrete,five groups of concrete with different stone powder content were tested for workability,shrinkage performance,crack resistance,compressive strength and chloride ion penetration resistance.The microstructure of manufactured sand concrete with different stone powder content was studied by MIP(mercury intrusion porosimetry)and SEM(scanning electron microscope)tests.The results show that there are some differences between the high-adsorption granite porphyry powder and ordinary limestone powder on properties and microstructure of concrete.The water demand of concrete increases with the increase of stone powder content,and the shrinkage rate of early age concrete increases with the increase of stone powder content.When the stone powder content is less than 8%,the crack resistance,compressive strength and chloride ion permeability of concrete will be improved with the increase of stone powder content;the main influence of granite porphyry powder on the microstructure performance of concrete is"filling"and"nucleation",and the microstructure performance increases with the increase of stone powder content;the increase of the stone powder content is beneficial to the development of concrete mechanical properties and durability.However,when the stone powder content continues to increase after it exceeds 8%,the crack resistance and chloride ion permeability of concrete decrease with the increase of the stone powder content,and the compressive strength value will fluctuate greatly as the stone powder content continues to increase.The influence of high-adsorption granite porphyry powder on the microstructure performance of concrete tends to be"diversified",and the increase in the content of granite porphyry powder is not conducive to the development of concrete mechanical properties and durability.
作者
于本田
刘通
王焕
谢超
李盛
YU Ben-tian;LIU Tong;WANG Huan;XIE Chao;LI Sheng(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;China Railway 14th Bureau Group Co.,Ltd.,Jinan 250014,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)
出处
《吉林大学学报（工学版）》
EI
CAS
CSCD
北大核心
2022年第5期1052-1062,共11页
Journal of Jilin University:Engineering and Technology Edition
基金
中国铁路总公司科技研究开发计划项目(P2018G004)
长江学者和创新团队发展计划项目(IRT_15R29)。
关键词
花岗斑岩
机制砂
石粉
混凝土
力学性能
耐久性能
微观结构
granite porphyry
manufactured sand
stone powder
concrete
mechanical properties
durability
microstructure
作者简介
于本田(1979-),男,副教授,博士.研究方向:混凝土材料与结构耐久性.E-mail:yubentian@mail.lzjtu.cn。
