文档介绍：2013 届毕业设计
外加剂掺量对混凝土性能的影响
院、部: 湖南工学院材料与化学学院
学生姓名: 谭贝
指导教师: 李治军职称讲师
专业: 无机非金属材料工程
班级: 材本0902班
完成时间: 2013年4月25日
摘要
外加剂是现代混凝土必不可少的组分之一,有些学者甚至称其为混凝土的第五元素。聚梭酸高效减水剂作为新一代减水剂具有掺量低、减水率高、保坍性能强、相容性强、生产无污染等优点。因此使用聚梭酸高效减水剂业已成为我国混凝土行业的发展趋势。
本毕业设计论文通过在C30混凝土中掺加不同掺量的聚羧酸高效减水剂VIVI-500,试验不同掺量下混凝土的活易性能(坍落度大小与损失程度)和物理性能(抗压、抗折强度)。分析其掺量对混凝土性能的影响。并利用优选相似对称原理,确定试验C30配比中聚羧酸减水剂VIVI-500的最佳掺量。
实验结果表明聚羧酸高效减水剂VIVI-500掺量最主要影响混凝土的坍落度大小,改善混凝土活易性能,减少坍落度损失,保持混凝土塑性,保证泵送施工。而对混凝土力学抗压,抗折强度影响不大。在混凝土外加剂的饱和掺量前随外加剂掺量的增加,混凝土坍落度快速增加,增幅比较大。而混凝土抗压,抗折强度会在初次掺加外加剂时略有降低然后回升,增幅较小。而在混凝土外加剂超过饱和掺量后,其混凝土活易性能,物理性能都会相对降低,对混凝土性能的改善起反作用。
关键词:外加剂掺量;坍落度大小;坍落度损失;抗压强度;抗折强度
ABSTRACT
Admixture is one of the ponents of modern concrete, some scholars have even referred to as the fifth element of concrete. Poly shuttle acid high efficiency water reducing agent as a new generation of water reducing agent with low dosage, high water reducing rate, collapse performance is strong, patibility, production of pollution-free, etc. So using poly shuttle acid high efficiency water reducing agent has e the development trend of the concrete industry in our country.
This graduation design paper through in C30 concrete mixed with different dosage of poly carboxylic acid high efficiency water reducing agent VIVI - 500 test live easy characteristics of concrete under different proportion of size and the loss rate (slump) and physical properties (compressive strength, bending strength). Analysis of the content on the properties of concrete. Determine test, and use the select similar symmetry principle, ratio of C30 poly carboxylic acid water reducing agent in the best dosage of VIVI - 500.
Experimental results show that poly carboxylic acid high efficiency water reducing agent dosage of VIVI - 500 the main size effect of concrete slump and live easy to improve concrete performance, reduce slump loss, maintain plastic, concrete pumping construction. And mechanics of pressive strength, flexural strength. In front of the c