纳米SiO_2提高不同龄期混凝土力学性能试验  

Mechanical Properties Improvement in Concrete of Every Age by Using Different Contents of Nano-SiO_2

作　　者：唐小萍 魏秀瑛 刘晓文 王学彦 

机构地区：[1]湖南高速铁路职业技术学院,湖南衡阳421001

出　　处：《科技导报》2011年第21期64-69,共6页Science & Technology Review

基　　金：湖南省科技厅科研计划项目(2010GK3148);湖南省教育厅科研计划项目(10CO159);衡阳市科技局科研计划项目(2010KG66)

摘　　要：以实际工程项目为背景,用纳米SiO2等量替换水泥制作混凝土试块,分别进行龄期为7、28、56d的立方体抗压强度试验、弹性变形试验、耐久性试验。采用线性回归的分析方法,对混凝土抗压强度试验数据进行分析,研究纳米SiO2的掺入量与提高混凝土强度之间的数值关系,建立了以纳米SiO2掺量为自变量,混凝土龄期分别是7、28、56d的抗压强度计算表达式。对弹性变形试验数据进行统计分析,研究不同纳米SiO2的掺入量对混凝土各龄期弹性模量的改善和提高、纳米SiO2对混凝土微观结构的改变、对抗渗标号和抗氯离子渗透能力的提高的影响,得出纳米SiO2的最佳掺入量,指导纳米SiO2混凝土的生产。Based on the actual projects,tests of concrete cubic-compressive strength,tests of elastic modulus,and tests of durability involving the concrete which cement is replaced with the same amount of nano-SiO2 making concrete blocks in the age periods of 7,28,and 56 days are respectively conducted.The data is analyzed,and the numerical relationship between incorporation of nano-SiO2 and concrete strength elevation is studied by using linear regression method.The calculation expression for the cubic-compressive strength of concrete with nano-SiO2 content and concrete periods of 7,28,and 56 days is established.The test data of elastic modulus is statistically analyzed,and the ways for improving and increasing of elastic modulus in different concrete ages with different contents of nano-SiO2,the effects of nano-SiO2 on the change of concrete microstructure and on the increase of anti-penetration grade and chloride-penetration resistance are explored.The best mixing amount of nano-SiO2 is obtained in order to guide the production of concrete contained nano-SiO2.

关 键 词：纳米SIO2 抗压强度 线性回归 弹性模量 

分 类 号：TU528.79[建筑科学—建筑技术科学]