建筑技术ArchitectureTechnology·1938·第54卷第16期2023年8月Vol.54No.16Aug.2023贝壳含量对中高强混凝土强度和耐久性影响研究谢嘉磊，张晨剑，王志豪，方思怡，巴明芳（宁波大学土木工程与地理环境学院，315211，浙江宁波）摘要：为了确定海砂中颗粒直径小于4.75mm的贝壳对30~60MPa中高强混凝土性能的影响，分别研究了贝壳含量不同的中高强混凝土的抗压强度和耐久性特征。结果表明：随着贝壳含量的增加，30~40MPa中高强混凝土抗压强度呈现增长趋势，同时该强度等级混凝土碳化后抗压强度的降低值减少，而强度在40~60MPa的混凝土碳化后抗压强度的降低值增加。30~50MPa的混凝土经硫酸盐侵蚀60次后抗压强度明显降低，50~60MPa的混凝土经硫酸盐侵蚀60次后抗压强度有所提高。总体上，以上中高强混凝土中贝壳含量越高，钢筋自腐蚀电位、腐蚀电流密度越大，相应氯离子迁移系数也越高。关键词：净化海砂；贝壳含量；中高强混凝土；碳化；抗氯离子渗透性能；干湿硫酸盐侵蚀中图分类号：TU528文献标志码：A文章编号：1000-4726(2023)16-1938-09STUDYONTHEEFFECTOFSHELLCONTENTONSTRENGTHANDDURABILITYOFMEDIUM-HIGHSTRENGTHCONCRETEXIEJia-lei,ZHANGChen-jian,WANGZhi-hao,FANGSi-yi，BAMing-fang(SchoolofCivilEngineeringandGeographicalEnvironment,NingboUniversity,315211,Ningbo,Zhejiang,China)Abstract:Inordertodeterminetheeffectofshellswithparticlediameterslessthan4.75mminseasandontheperformanceofmedium-highstrengthconcreteat30~60MPa,thecompressivestrengthanddurabilitycharacteristicsofmedium-highstrengthconcreteatdifferentconcentrationsofshellswerestudied.Theresultsshowthatwiththeincreaseofshellcontent,thecompressivestrengthof30~40MPamedium-highstrengthconcreteshowsanincreasingtrend.Atthesametime,thedecreaseincompressivestrengthofconcretewiththisstrengthlevelaftercarbonizationdecreases,whilethedecreaseincompressivestrengthofconcretewithastrengthbetween40~60MPaaftercarbonizationincreases.Thecompressivestrengthofconcretewithapressurerangeof30~50MPadecreasedsignificantlyafter60timesofsulfateattack,whilethecompressivestrengthofconcretewithapressurerangeof50~60MPaincreasedaftersulfateattack.Overall,thehighercontentofshellsinthemedium-highstrengthconcretementionedabove,...
