粉煤灰混凝土高温后强度退化规律研究
发布时间：2018-08-03 08:16
【摘要】：水泥、沙子、石子、水、粉煤灰、外加剂是混凝土中的重要组成部分,在混凝土中掺入粉煤灰,不但可节约大量的水泥和细骨料,减少了用水量,改善了混凝土拌和物的和易性、粘聚性、保水性,并能增强混凝土的可泵性：减少了混凝土的徐变；减少水化热、热能膨胀性,从而了减少了混凝土表面产生的裂纹；提高混凝土抗渗能力和耐久性；增加混凝土的修饰性。并能够充分地利用工业废渣,减少环境污染,降低混凝土生产成本,变废为宝,化害为利,提高混凝土的性能,更有利于粉煤灰的综合利用,是目前混凝土中比较理想的掺加料。在考虑混凝土受热后的力学性能与温度、养护条件之间的关系时,必然要对粉煤灰混凝土结构残余承载能力和耐久性进行分析,并能快速、准确的评定出混凝土的残余强度,用无损检测的方法来研究其适用性,并分析计算混凝土材料的使用性能以及残余强度。采用单因素分析方法研究了不同掺量粉煤灰混凝土,在不同高温温度作用后的混凝土残余抗压强度、残余劈拉强度与回弹值、声速值之间的变化规律。利用Excel的一元线性回归、二元线性回归、二元非线性回归,分析了回弹、超声一回弹检测高温作用后混凝土残余强度方法的适用性,并且建立高温后混凝土强度与回弹值、声速值之间的回归方程。
[Abstract]:Cement, sand, stone, water, fly ash and admixture are important parts of concrete. Adding fly ash to concrete not only saves a lot of cement and fine aggregate, but also reduces water consumption. It can improve the easiness, agglomeration and water retention of concrete, and can enhance the pumpability of concrete, reduce the creep of concrete, reduce the heat of hydration and thermal expansion, and thus reduce the cracks on the surface of concrete. Improve the impermeability and durability of concrete; increase the modification of concrete. It can make full use of industrial waste residue, reduce environmental pollution, reduce the production cost of concrete, turn waste into treasure, improve the performance of concrete, and be more favorable to the comprehensive utilization of fly ash. It is an ideal admixture in concrete at present. Considering the relationship between mechanical properties, temperature and curing conditions of concrete after heating, it is necessary to analyze the residual bearing capacity and durability of fly ash concrete structure, and to evaluate the residual strength of concrete quickly and accurately. Nondestructive testing is used to study its applicability and to analyze and calculate the performance and residual strength of concrete. The variation of residual compressive strength, residual splitting tensile strength, springback value and sound velocity of concrete with different content of fly ash at different temperature and temperature were studied by single factor analysis method. By using Excel's linear regression and binary nonlinear regression, the applicability of the method of rebound and ultrasonic rebound to detect the residual strength of concrete after high temperature is analyzed, and the strength and rebound value of concrete after high temperature are established. The regression equation between the velocity of sound.
【学位授予单位】：西安工业大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU528.2
本文编号：2161154
[Abstract]:Cement, sand, stone, water, fly ash and admixture are important parts of concrete. Adding fly ash to concrete not only saves a lot of cement and fine aggregate, but also reduces water consumption. It can improve the easiness, agglomeration and water retention of concrete, and can enhance the pumpability of concrete, reduce the creep of concrete, reduce the heat of hydration and thermal expansion, and thus reduce the cracks on the surface of concrete. Improve the impermeability and durability of concrete; increase the modification of concrete. It can make full use of industrial waste residue, reduce environmental pollution, reduce the production cost of concrete, turn waste into treasure, improve the performance of concrete, and be more favorable to the comprehensive utilization of fly ash. It is an ideal admixture in concrete at present. Considering the relationship between mechanical properties, temperature and curing conditions of concrete after heating, it is necessary to analyze the residual bearing capacity and durability of fly ash concrete structure, and to evaluate the residual strength of concrete quickly and accurately. Nondestructive testing is used to study its applicability and to analyze and calculate the performance and residual strength of concrete. The variation of residual compressive strength, residual splitting tensile strength, springback value and sound velocity of concrete with different content of fly ash at different temperature and temperature were studied by single factor analysis method. By using Excel's linear regression and binary nonlinear regression, the applicability of the method of rebound and ultrasonic rebound to detect the residual strength of concrete after high temperature is analyzed, and the strength and rebound value of concrete after high temperature are established. The regression equation between the velocity of sound.
【学位授予单位】：西安工业大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU528.2
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