排序方式： 共有42条查询结果，搜索用时 109 毫秒
1.
分别通过对3个不同水灰比(0.25,0.30,0.35)和4个不同养护温度(10℃,20℃,30℃,40℃)条件下28d龄期内水泥胶砂自收缩的测定,揭示了水泥胶砂自收缩与养护温度之间的依存关系,为高强混凝土自收缩温度依存性的后续研究提供必要的参考依据.得出同一水灰比的胶砂,随着养护温度的升高,早龄期自收缩速率加快,自收缩量明显增大;随着水灰比的降低,自收缩量显著增大等初步结论. 相似文献
2.
王钰锋 《邵阳学院学报(社会科学版)》2003,2(2):115-116
介绍了建筑装饰工程用水泥砂浆的配制、工地现场快速分析配比的方法，以及适用范围及注意事项，对工程实际有一定的指导作用． 相似文献
3.
砂浆填充理论在混凝土配合比设计中的运用 总被引：1，自引：0，他引：1
刘建波 《石家庄铁路职业技术学院学报》2005,4(4):21-26
通过对砂浆填充理论设计混凝土配合比理论的分析，应用计算机实现对传统的混凝土配合比设计方法的改进。 相似文献
4.
Lidia Armelao Arianna Bassan Renzo Bertoncello Guido Biscontin Sergio Daolio Antonella Glisenti 《Journal of Cultural Heritage》2000,1(4)
The study of the interaction between silica glass and saturated Ca(OH)2 solutions can be a useful approach to resolve the problem of the adhesion between lime-sand mortar and clay bricks. Since it is reasonable that the silica–calcium hydroxide system well simulates a brick–mortar system, experimental observations concerning the interaction of silica glass and this strong basic solution should be of value for the comprehension of the chemical reactions that could take place at the mortar–brick interface, maybe affecting the adhesion between the two building materials. We demonstrated the effects of saturated Ca(OH)2 solutions on commercial pure silica glass (fused silica) and on silica films obtained via a sol–gel process by means of dip-coating. Silica samples were dipped in the solutions at different temperatures (room temperature, 60 and 80 °C) and at different time intervals (1 and 21 h) and then they were analysed by means of surface techniques: X-ray photoelectron spectroscopy (XPS), secondary ion mass spectrometry (SIMS) and atomic force microscopy (AFM). It has been shown that Ca(OH)2 reacts with the silica glass network. The experimental results clearly show a very different behaviour of sol–gel silica with respect to fused silica, probably because of their different nanostructure. Many problems concerning the interaction of silica and Ca(OH)2 are still to be solved, but the results of this research strengthen the idea that adhesion between lime-sand mortar and clay bricks is caused not only by carbonation of calcium hydroxide contained in the mortar, but even by some chemical reactions involving the brick constituents and calcium hydroxide itself. The final products, calcium silicates, may induce a chemical continuity between lime-sand mortar and clay bricks. 相似文献
5.
采用干排粉煤灰、水泥、矿粉、干砂及复合外加剂，经配比、粉磨和搅拌混合等工艺，研制出蒸压粉煤灰加气砼(以下简称加气砼)专用抹面砂浆，其物理力学性能及施工性能满足加气砼墙体粉刷要求，并能实现干作业，综合效益与社会效益好，是解决目前加气砼墙体空鼓，开裂等质量通病的创新产品。 相似文献
6.
7.
选取了市场中常见的几种可再分散乳胶粉,采用低掺量配比拌制粘接砂浆,列出试验资料,分析了在较低的可再分散乳胶粉掺量下,胶粉对EPS薄抹灰系统中胶粘剂拉伸粘结强度的影响效果。 相似文献
8.
王超 《湖北第二师范学院学报》2012,(2):68-70
将水泥砂浆与聚合物等材料以适当比例配制而形成的聚合物水泥砂浆,因其材料组成中有热塑性高分子化合物,在固化剂作用下可形成不溶、不熔硬质的复合材料,此复合材料具有包括抗冲耐磨性能在内的许多优良力学性能。因此,选择合适的材料组成成分并确定其配合比,是实现材料优良性能的先决条件。 相似文献
9.
Slađana Popović Nikola Unković Gordana Subakov Simić Milica Ljaljević Grbić 《文物保护研究》2018,63(5):292-302
The presence of biofilms on stone monuments can lead to biodeterioration processes that significantly lower not only the aesthetic value of cultural heritage sites but also cause considerable physical and chemical damage to stone surfaces. In terrestrial environments, cyanobacteria have a significant role in biofilm formation on a variety of natural and artificial stone substrata, including granite, sandstone, limestone, lime mortar, etc. Studies on cyanobacterial diversity and estimation of biodeteriorative activity on stone cultural heritage objects can be very important for conservators and restorers, and cyanobacteria removal from stone monuments is currently a great challenge for conservation science. In that sense, the diversity of terrestrial cyanobacteria was investigated at six localities in Serbia. Samples for cyanobacterial analyses were taken from surface biofilms covering different substrata: granite and lime mortar (The Monument to the Unknown Hero), sandstone (Branko's Bridge, Eiffel’s Lock) and carbonate rock (Medieval tombstones from Mramorje and Rasti?te, Gradac Monastery). A total of 18 cyanobacterial taxa were identified. The highest diversity was found on carbonate rock, followed by sandstone. Cyanobacteria were also recorded on an artificial substratum – lime mortar, while cyanobacteria were not found on granite. All detected cyanobacteria seriously impaired the structural and aesthetic integrity of the studied monuments via mechanical and chemical actions, so their presence must not be overlooked. 相似文献
10.
我国砖混结构建筑存量大,大部分抗震性能差,抗震加固形势紧迫。针对几种常用砖混结构抗震加固技术,从施工、造价、力学性能、适用范围等方面进行综合分析,并提出一种施工简单、造价适中、力学性能合理、适用范围广的新型抗震加固技术——高延性砂浆夹碳纤维网格布新技术。介绍其应用及研究情况,指出需要进一步研究的内容,对合理选择砖混建筑加固技术和未来研究方向有重要参考价值。 相似文献