环境作用下粗骨料对混凝土性能影响的时变研究  

Time-Varying Study on Effect of Coarse Aggregate on Concrete Performance under Environmental Action

作　　者：张文静 张戎令[3] 张岩 王玉林 张富奎 王先龙 安康乐 ZHANG Wenjing;ZHANG Rongling;ZHANG Yan;WANG Yulin;ZHANG Fukui;WANG Xianlong;AN Kangle(Gansu Provincial Transportation Research Institute Group Co.,Ltd.,Lanzhou 730000,China;Gansu Provincial Road Materials Engineering Laboratory,Lanzhou 730000,China;National and Local Joint Engineering Laboratory of Road&Bridge Engineering Disaster Prevention Technology Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;Gansu Province Highway Construction Group Co.,Ltd.,Lanzhou 730030,China;Gansu Province Planning Survey&Design Institute Co.,Ltd.,Lanzhou 730030,China)

机构地区：[1]甘肃省交通科学研究院集团有限公司,兰州730000 [2]甘肃省道路材料工程实验室,兰州730000 [3]兰州交通大学道桥工程灾害防治技术国家地方联合工程实验室,兰州730070 [4]甘肃省公交建集团有限公司,兰州730030 [5]甘肃省交通规划勘察设计院股份有限公司,兰州730030

出　　处：《硅酸盐通报》2025年第1期133-141,共9页Bulletin of the Chinese Ceramic Society

基　　金：交通运输行业重点科技项目(2021-ZD2-073);兰州市科技计划项目(2022-5-47);甘肃省科技重点研发计划(21YF11GA011);甘肃省科技厅中小企业创新基金项目(22CX3GA073)。

摘　　要：为探究冻融循环-硫酸盐腐蚀环境下辉长岩(SMK)、花岗岩(LBH)、辉绿岩(HYS)、片麻岩(LFS)、硅化英安岩(SSH)对混凝土性能的影响,通过抗压强度、孔结构等混凝土宏-微观试验,研究了5种粗骨料所制备混凝土在Na_(2)SO_(4)溶液半浸泡下经历不同冻融循环次数的时变规律。结果表明:随着冻融循次数的增加,HYS混凝土和LFS混凝土表观损失较为严重,内部部分粗骨料疏松,强度降低且骨料与水泥砂浆的界面黏结强度降低;在冻融循环初期,5组混凝土试件内孔隙快速扩展且有较多新的孔隙萌生,小孔数量增加,大孔数量减小,抗压强度也随之增大;在冻融循环后期,试样内部大孔径孔隙增多,LFS混凝土内部部分粗骨料疏松膨胀,混凝土开裂加剧;LFS混凝土孔隙扩展最大,HYS混凝土孔隙扩展次之;在冻融循环后期,5组混凝土试件的孔径变化趋势基本一致,混凝土强度降低,且与孔隙变化呈正相关,但强度降低幅度与粗骨料自身性质相关。该研究可为冻融循环-硫酸盐腐蚀环境下粗骨料质量控制及混凝土可持续利用提供借鉴。In order to explore the effects of gabbro(SMK),granite(LBH),diabase(HYS),gneiss(LFS),silicified dacite(SSH)on the properties of concrete under freeze-thaw and sulfate corrosion environment,the macro-micro tests of concrete such as compressive strength and pore structure were carried out to study the time-varying law of concrete prepared by five kinds of coarse aggregates undergoing different freeze-thaw cycle times under semi-immersion of Na_(2)SO_(4)solution.The results show that with the increase of freeze-thaw cycle times,the apparent loss of HYS concrete and LFS concrete is more serious,the internal part of coarse aggregate is loose,the strength is reduced,and the interfacial bonding strength between aggregate and cement mortar is reduced.At the beginning of freeze-thaw cycle test,the pores in the five groups of concrete specimens expand rapidly and many new pores generate.The number of small pores increases,the number of large pores decreases,and the compressive strength also increases.In the later stage of freeze-thaw cycle,the large pore size in specimen increases,the coarse aggregate in LFS concrete is loose and expanded,and the concrete cracking is aggravated.LFS concrete has the largest pore expansion,followed by the HYS concrete pore expansion.The pore size variation trend of the five groups of concrete specimens is basically the same.The strength of concrete decreases and is positively correlated with the pore change,but the strength reduction is related to the performance of coarse aggregate itself.This study can be crude in freeze-thaw and sulfate corrosion environment.The research results can provide reference for quality control of coarse aggregate and sustainable utilization of concrete under freeze-thaw sulfate corrosion environment.

关 键 词：混凝土 粗骨料劣化 冻融循环 硫酸盐腐蚀 抗蚀系数 孔结构分析 

分 类 号：TU528[建筑科学—建筑技术科学]