孔隙水饱和度对粉煤灰混凝土力学性能影响的研究

发布时间：2018-03-04 04:39

本文选题：粉煤灰混凝土　切入点：孔隙水饱和度　出处：《中国矿业大学》2014年硕士论文　论文类型：学位论文

【摘要】：本文进行了孔隙水饱和度对粉煤灰混凝土力学性能影响规律的试验研究，得出了微环境相对湿度、温度、粉煤灰掺量和水胶比对粉煤灰混凝土孔隙水饱和度的影响规律，探讨了孔隙水饱和度对粉煤灰混凝土抗压强度和弹性模量的影响，并进行了孔隙水饱和度对无损检测粉煤灰混凝土抗压强度影响规律的试验研究，主要内容如下：进行了不同水胶比和粉煤灰掺量混凝土在不同温湿度条件下孔隙水饱和度的试验研究，分析了微环境相对湿度、温度、粉煤灰掺量以及水胶比对孔隙水饱和度的影响规律。研究结果表明，，孔隙水饱和度分别随微环境相对湿度的增大、温度的降低和水胶比的减小而增大，当粉煤灰掺量不超过15%时，孔隙水饱和度随粉煤灰掺量的增加而增大，当粉煤灰掺量超过15%时，孔隙水饱和度降低。最后分析了微环境相对湿度、温度、粉煤灰掺量以及水胶比与混凝土孔隙水饱和度之间的相关性。进行了不同孔隙水饱和度的粉煤灰混凝土抗压强度的试验研究，分析了孔隙水饱和度对粉煤灰混凝土抗压强度的影响规律。研究结果表明，粉煤灰混凝土的抗压强度随孔隙水饱和度的增大而降低，当孔隙水饱和度小于20%时，抗压强度随孔隙水饱和度的增大而缓慢降低，孔隙水饱和度从20%增加到60%时，抗压强度迅速下降，孔隙水饱和度大于60%时，抗压强度趋于稳定。进行了不同孔隙水饱和度对粉煤灰混凝土回弹值和超声声速影响的试验研究，分析了孔隙水饱和度对无损检测粉煤灰混凝土抗压强度的影响规律。研究结果表明，平均回弹值随孔隙水饱和度的增大而减小，超声声速随孔隙水饱和度的增大而增大，最后建立了考虑孔隙水饱和度的粉煤灰混凝土的测强曲线。进行了不同孔隙水饱和度的粉煤灰混凝土弹性模量的试验研究，分析了孔隙水饱和度对粉煤灰混凝土弹性模量的影响规律。研究结果表明，粉煤灰混凝土的弹性模量随着孔隙水饱和度的增大而增大，当孔隙水饱和度不大于20%时，弹性模量随孔隙水饱和度的增加而缓慢增大，孔隙水饱和度从20%增加到60%时，弹性模量迅速增大，孔隙水饱和度大于60%时，弹性模量缓慢增大。
[Abstract]:The effect of pore water saturation on the mechanical properties of fly ash concrete is studied in this paper. The effects of relative humidity, temperature, fly ash content and water / binder ratio on pore water saturation of fly ash concrete are obtained. The influence of pore water saturation on compressive strength and elastic modulus of fly ash concrete is discussed, and the influence of pore water saturation on nondestructive testing of compressive strength of fly ash concrete is studied. The main contents are as follows:. The pore water saturation of concrete with different water / binder ratio and fly ash content under different temperature and humidity conditions was studied, and the relative humidity and temperature of microenvironment were analyzed. The results show that the pore water saturation increases with the increase of relative humidity, the decrease of temperature and the decrease of water-binder ratio. When the content of fly ash is not more than 15, the saturation of pore water increases with the increase of the amount of fly ash, and when the content of fly ash exceeds 15, the saturation of pore water decreases. Finally, the relative humidity and temperature of microenvironment are analyzed. The correlation between the content of fly ash and the ratio of water to binder and the saturation of pore water in concrete. The compressive strength of fly ash concrete with different pore water saturation is studied, and the influence of pore water saturation on compressive strength of fly ash concrete is analyzed. The compressive strength of fly ash concrete decreases with the increase of pore water saturation. When the pore water saturation is less than 20, the compressive strength decreases slowly with the increase of pore water saturation, and the pore water saturation increases from 20% to 60. The compressive strength decreases rapidly, and when the pore water saturation is greater than 60, the compressive strength tends to be stable. The effects of different pore water saturation on the rebound value and ultrasonic sound velocity of fly ash concrete are studied. The influence of pore water saturation on nondestructive testing of compressive strength of fly ash concrete is analyzed. The average springback value decreases with the increase of pore water saturation, and the ultrasonic sound velocity increases with the increase of pore water saturation. Finally, the strength measurement curve of fly ash concrete considering pore water saturation is established. The elastic modulus of fly ash concrete with different pore water saturation is studied, and the influence of pore water saturation on elastic modulus of fly ash concrete is analyzed. The elastic modulus of fly ash concrete increases with the increase of pore water saturation. When the pore water saturation is less than 20, the elastic modulus increases slowly with the increase of pore water saturation, and the pore water saturation increases from 20% to 60. The elastic modulus increases rapidly, and when the pore water saturation is greater than 60, the elastic modulus increases slowly.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU528

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