摘要
利用正交试验的方法对高活性矿物掺合料混凝土(以下简称掺合料混凝土)的强度进行试验。研究偏高岭土掺量、超细粉煤灰掺量、硅灰掺量对掺合料混凝土7 d、14 d、28 d抗压强度和劈裂抗拉强度的影响,并对数据结果进行系统分析。试验结果表明,偏高岭土对掺合料混凝土早期的力学性能影响最大,力学性能随着偏高岭土掺量的增加而增加。通过多元线性回归,建立不同因素对掺合料混凝土各龄期抗压强度、劈裂抗拉强度的数学表达式,得到偏高岭土和硅灰对掺合料混凝土均为正影响,而超细粉煤灰为负影响的结果。当偏高岭土的掺量为10%(质量分数),超细粉煤灰掺量为15%(质量分数),硅灰掺量为5%(质量分数)时,掺合料混凝土力学性能达到最佳。最后进行微观分析得出,矿物掺合料的复合化具有超叠加效应,能增强掺合料混凝土各龄期的力学性能。
Orthogonal experiment method was applied to analyze the mechanical properties of high active mineral admixture concrete.The effects of metakaolin content,ultrafine fly ash content and silica fume content on the compressive strength and splitting tensile strength of admixture concrete at 7 d,14 d and 28 d were studied,and the results were analyzed systematically.Test results show that metakaolin has the greatest influence on the early mechanical properties of admixture concrete,and the mechanical properties increase with the increase of metakaolin content.The mathematical formula of different factors on compressive strength and splitting tensile strength of admixture concrete at each age are established through multiple linear regression.Metakaolin and silica fume have positive effects on the admixture concrete,while ultrafine fly ash has negative effects.When the content of metakaolin is 10%(mass fraction),ultrafine fly ash content is 15%(mass fraction),and silica fume content is 5%(mass fraction),the mechanical properties of the admixture concrete reach the best.Finally,the microscopic analysis shows that the compounding of mineral admixture has super-compound,which enhances the mechanical properties of admixture concrete at each ages.
作者
庞建勇
陈旭鹏
PANG Jianyong;CHEN Xupeng(School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan 232001,China)
出处
《硅酸盐通报》
CAS
北大核心
2020年第10期3143-3151,共9页
Bulletin of the Chinese Ceramic Society
基金
安徽省高校自然科学研究重点项目(KJ2019A1043)。
关键词
混凝土
矿物掺合料
力学性能
正交试验
最佳配比
多元回归模型
微观分析
concrete
mineral admixture
mechanical property
orthogonal test
optimum proportion
multiple regression model
microanalysis
作者简介
庞建勇(1964—),男,教授。主要从事岩土工程方面的教学与研究工作。E-mail:pangjyong@163.com。
