期刊文献+
共找到4篇文章
< 1 >
每页显示 20 50 100
改性压实水泥抗压强度影响因素的研究 被引量:1
1
作者 卢都友 许仲梓 唐明述 《南京化工大学学报》 1996年第3期34-38,共5页
采用DSP原理和压实技术相结合,掺加硅灰和CaCO3等细颗粒矿物外加剂改变压实水泥材料基质。研究了成型压力、细粉掺量、养护制度等因素对压实水泥强度的影响。结果表明,掺加适量硅灰和提高成型压力可显著提高压实水泥的抗压强... 采用DSP原理和压实技术相结合,掺加硅灰和CaCO3等细颗粒矿物外加剂改变压实水泥材料基质。研究了成型压力、细粉掺量、养护制度等因素对压实水泥强度的影响。结果表明,掺加适量硅灰和提高成型压力可显著提高压实水泥的抗压强度,掺加CaCO3对强度无明显影响;压实水泥存在最佳养护龄期,超过此龄期强度倒缩。 展开更多
关键词 压实水泥 硅灰 碳酸钙 强度 改性 水泥
下载PDF
硅灰改性压实水泥材料的组成和微观结构
2
作者 卢都友 许仲梓 唐明述 《南京化工大学学报》 1997年第1期1-6,共6页
用DTA、XRD及SEM分析了不同养护条件下硅灰改性前后压实水泥的组成和微观结构,并探讨了结构与耐久性的关系。结果表明:在常温水养护条件下,除Ca(OH)2外,硅灰改性前后压实水泥的组成无明显差异;压蒸条件下,随压蒸... 用DTA、XRD及SEM分析了不同养护条件下硅灰改性前后压实水泥的组成和微观结构,并探讨了结构与耐久性的关系。结果表明:在常温水养护条件下,除Ca(OH)2外,硅灰改性前后压实水泥的组成无明显差异;压蒸条件下,随压蒸时间延长伴有产物的转化和晶化,掺入硅灰后,产物向低CaO/SiO2方向转化和晶化;材料结构中未水化水泥颗粒进一步水化以及产物的转化和晶化对材料的结构和性能产生不利影响。 展开更多
关键词 压实水泥 硅灰 水泥材料 改性
下载PDF
Damage model of fresh concrete in sulphate environment 被引量:3
3
作者 张敬书 张银华 +3 位作者 冯立平 金德保 汪朝成 董庆友 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第3期1104-1113,共10页
A model of damage to fresh concrete in a corrosive sulphate environment was formulated to investigate how and why the strength of corroded concrete changes over time. First, a corroded concrete block was divided into ... A model of damage to fresh concrete in a corrosive sulphate environment was formulated to investigate how and why the strength of corroded concrete changes over time. First, a corroded concrete block was divided into three regions: an expanded and dense region; a crack-development region; and a noncorroded region. Second, based on the thickness of the surface corrosion layer and the rate of loss of compressive strength of the corroding region, a computational model of the concrete blocks' corrosion-resistance coefficient of compressive strength in a sulphate environment was generated. Third, experimental tests of the corrosion of concrete were conducted by immersing specimens in a corrosive medium for 270 d. A comparison of the experimental results with the computational formulae shows that the calculation results and test results are in good agreement. A parameter analysis reveals that the corrosion reaction plays a major role in the corrosion of fresh concrete containing ordinary Portland cement,but the diffusion of the corrosion medium plays a major role in the corrosion of concrete mixtures containing fly ash and sulphate-resistant cement. Fresh concrete with a high water-to-cement ratio shows high performance during the whole experiment process whereas fresh concrete with a low water-to-cement ratio shows poor performance during the late experiment period. 展开更多
关键词 fresh concrete sulphate corrosion corrosion coefficient computational model
下载PDF
An Experimental Study on the Wave-Induced Pore Water Pressure Change and Relative Influencing Factors in the Silty Seabed
4
作者 LI Anlong LUO Xiaoqiao +2 位作者 LIN Lin YE Qing LI Chunyu 《Journal of Ocean University of China》 SCIE CAS 2014年第6期911-916,共6页
In this study, a flume experiment was designed to investigate the characteristics of wave-induced pore water pressure in the soil of a silty seabed with different clay contents, soil layer buried depths and wave heigh... In this study, a flume experiment was designed to investigate the characteristics of wave-induced pore water pressure in the soil of a silty seabed with different clay contents, soil layer buried depths and wave heights respectively. The study showed that water waves propagating over silty seabed can induce significant change of pore water pressure, and the amplitude of pore pressure depends on depth of buried soil layer, clay content and wave height, which are considered as the three influencing factors for pore water pressure change. The pressure will attenuate according to exponential law with increase of soil layer buried depth, and the attenuation being more rapid in those soil layers with higher clay content and greater wave height. The pore pressure in silty seabed increases rapidly in the initial stage of wave action, then decreases gradually to a stable value, depending on the depth of buried soil layer, clay content and wave height. The peak value of pore pressure will increase if clay content or depth of buried soil layer decreases, or wave height increases. The analysis indicated that these soils with 5% clay content and waves with higher wave height produce instability in bed easier, and that the wave energy is mostly dissipated near the surface of soils and 5% clay content in soils can prevent pore pressure from dissipating immediately. 展开更多
关键词 wave action silty seabed pore water pressure development influencing factor
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部