-3℃养护条件下矿物掺合料对混凝土强度和孔隙结构的影响研究  

Effect of mineral admixtures on strength and pore structure of concrete at -3℃curing condition

作　　者：郭海贞 张戎令[1,2] 王起才[1,2] 代金鹏[1] 娄许煜 谢智刚 GUO Haizhen;ZHANG Rongling;WANG Qicai;DAI Jinpeng;LOU Xuyu;XIE Zhigang(Key Laboratory of Road and Bridges and Underground Engineering of Gansu Province,Lanzhou Jiaotong University,Lanzhou 730070,China;National and Provincial Joint Engineering Laboratory of Road and Bridge Disaster Prevention and Control,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学甘肃省道路桥梁与地下工程重点实验室,甘肃兰州730070 [2]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,甘肃兰州730070

出　　处：《混凝土》2020年第4期103-106,109,共5页Concrete

基　　金：国家自然科学基金资助项目(51268032,51768033);青年人才托举工程(2015QNRC001);飞天学者特聘计划;陇原青年创新人才扶持计划;长江学者和创新团队发展计划滚动支持(IRT_15R29);中国交建2016年创新平台建设应用基础研究资助项目(2016-ZJKJ-PTJS04);甘肃省基础研究创新群体(145RJIA332);甘肃省高校协同创新科技团队支持计划资助项目(2017C-08);兰州交通大学青年科学基金资助项目(2017015);兰州交通大学优秀科研团队资助项目(201606)。

摘　　要：为了研究不同养护条件下矿物掺合料对混凝土强度和孔隙结构的影响,进行-3℃和标准养护条件下,复掺粉煤灰、矿粉和硅灰对混凝土抗压强度、孔隙结构的试验。结果表明:与标准养护相比,在-3℃养护条件下,矿物掺合料的掺入对混凝土抗压强度有下降趋势,但对其孔径均有优化作用。基准组、复掺10%粉煤灰+10%矿粉+1%硅灰组、复掺10%粉煤灰+10%矿粉+3%硅灰组,28 d龄期标准养护下出现细小孔的频率是负温养护1.122~1.259倍,56 d龄期标准养护下出现细小孔的频率是负温养护1.108~1.180倍,矿物掺合料对混凝土硬化含气量和平均气泡间距均有改善作用,在标准养护条件下的优化作用明显优于负温养护条件。In order to study the effect of mineral admixtures on the strength and pore structure of concrete under different curing conditions,the tests on the compressive strength and pore structure of concrete with fly ash,mineral powder and silica fume were carried out under the condition of-3℃and standard curing conditions.The results show that,compared with the standard curing,the compressive strength of concrete can be reduced by the addition of mineral admixture at-3℃,but the pore size is optimized.The base group,10%fly ash+10%mineral powder+1%silica fume group and 10%fly ash+10%mineral powder+3%silica fume group,the frequency of small hole in 28 d age standard curing is 1.122~1.259 times the negative temperature curing,the frequency of small hole in the standard curing of56 d age is 1.108~1.180 times the negative temperature curing,and the mineral admixture is hardening gas in the concrete.Both the volume and the average bubble spacing are all improved,and the optimization effect under standard curing condition is obviously better than that under negative temperature curing condition.

关 键 词：负温养护条件 标准养护条件 矿物掺合料 抗压强度 孔结构 

分 类 号：TU528.064[建筑科学—建筑技术科学]