【摘 要】
：
Experimental results about concrete under sulfate attack are summarized,which include the variation of mass density of samples and velocity of ultrasonic wave p
【机 构】
：
The Faculty of Mechanical Engineering and Mechanics,State Key Laboratory of Turbulence and Complex S
论文部分内容阅读
Experimental results about concrete under sulfate attack are summarized,which include the variation of mass density of samples and velocity of ultrasonic wave propagating in samples.The evolution damage is analyzed in terms of the experimental results,and close attention is paid to the effect of damage evolution on Poissons ratio.This study shows that Poissons ratio is significantly affected by the concentration of solution and water-cement ratio.Poissons ratio of concrete changes very little when the water-cement ratio is selected as 0.6 or 0.8,so that such change may be neglected.If water-cement is 0.4,however,the Poissons ratio of the sample significantly changes.When the concrete sample of 0.4 water-cement ratio is immersed in sodium sulfate solution of 8％ concentration for 285 days,Poissons ratio increase 10.14％ compared with its initial value.There exist a sensitive region and a non-sensitive region for the change rate of Poissons ratio with respect to corrosion time.The change rate of Poissons ratio monotonously decreases with corrosion time in the sensitive region; in the non-sensitive region,the change rate of Poissons ratio is almost equal to zero.
其他文献
传统医药知识是在待定自然环境条件和历史文化背景下,人类社会与自然界相互作用的产物,具有突出的民族性、地域性和历史传承性.宽筋藤在傣医药学、泰国兰纳医药学以及中医药
As semi-conductor technologies move down to the nanometer scale, leakage power has become a significant component of the total power consumption. In this paper,
文章通过对城市污水处理厂污泥的产生过程、污泥减量机理的研究以及各种污泥减量技术的对比,提出利用微生物进行污泥减量的实用性和可行性.
The increase of atmospheric carbon dioxide and the global warming due to its greenhouse effect resulted in worldwide concerns. On the other hand, carbon dioxide
The single crystals of the azo copper(Ⅱ)-complex have been obtained from the solution of the compound dissolved in the ethanol by slow evaporation at room temp
本文以监理工作的实际工作经验,着重阐述了监理工程师在工程施工现场对施工工序的质量控制,对施工工序的质量控制重点及对策进行了分析介绍.
A wet impact crusher was used to breakdown waste printed circuit boards (PCBs) in a water medium.The relationship between the yield of crushed product and the o
为了提高管碟法测定抗生素效价的准确性.我们按操作步骤逐步分析,并提出合理的解决方案.结果,减少外界因素与人为因素给试验带来的误差可以提高测定结果的准确性.
为研究复合顶板沿空巷道围岩变形破坏机理及控制技术,基于该类巷道变形破坏特征的分析,得到巷道变形破坏的主要原因是没有考虑复合顶板沿空巷道围岩特性、支护强度低、变形不
Chromium and/or arsenate removal by Fe(Ⅱ) as a function of pH, Fe(Ⅱ) dosage and initial Cr(Ⅵ)/As(Ⅴ) ratio were examined in batch tests. The presence of arse