石灰石粉对再生混凝土力学性能及抗冻性影响研究  

Study on the Effect of Limestone Powder on Mechanical Properties and Frost Resistance of Recycled Concrete

作　　者：刘晓峰 蒋琼明[2] LIU Xiao-feng;JIANG Qiong-ming(Zhejiang Guangsha University of Applied Construction Technology , Dongyang 322110;Guangxi University,Nanning 530000 China)

机构地区：[1]浙江广厦建设职业技术大学,浙江东阳322110 [2]广西大学,广西南宁530000

出　　处：《湘潭大学学报（自然科学版）》2020年第2期120-126,共7页Journal of Xiangtan University(Natural Science Edition)

基　　金：浙江省教育厅一般科研项目(Y201840361)。

摘　　要：为研究石灰石粉对再生混凝土力学性能及抗冻性的影响,通过室内配合比试验,分别对不同石灰石粉掺量的再生混凝土试块进行抗压强度、抗折强度及快速冻融循环试验,得出以下结论:(1)再生混凝土拌合物的坍落度随着石灰石粉掺量的增大逐渐增大,质量损失随之呈先减后增变化,抗压强度、抗折强度及相对动弹性模量则随之呈先增后减变化;(2)适量的石灰石粉有利于提高再生混凝土的工作性、抗冻性及力学性能,但石灰石粉过量则对各项性能不利;(3)综合再生混凝土的流动性、抗冻性及力学性能方面考虑,石灰石粉的最佳掺量范围为5%~10%.In order to study the effect of limestone powder on the mechanical properties and frost resistance of recycled concrete,the compressive strength,bending strength and rapid freeze-thaw cycle test of recycled concrete with different limestone powder content were carried out through indoor mix ratio test,and the following conclusions were drawn:(1)The slump of recycled concrete mixture increased gradually with the increase of limestone powder content,and the mass loss decreased at first and then increased.The compressive strength,bending strength and relative dynamic elastic modulus increased at first and then decreased.(2)Proper amount of limestone powder is beneficial to improve the workability,frost resistance and mechanical properties of recycled concrete,but the excessive amount of limestone powder is disadvantageous.(3)Take into account the fluidity,the freezing resistance and the mechanical property of the comprehensive regenerated concrete,the optimal content range of the limestone powder is 5%~10%.

关 键 词：石灰石粉 再生混凝土 坍落度 力学性能 抗冻性 

分 类 号：O152.1[理学—数学]