超效缓粘结预应力材料试验研究

缓粘结预应力的关键技术之一是缓凝砂浆的研究．基于此试制出了缓凝期为30d以上的超效缓凝剂;并针对其凝结时间、强度、体积稳定性等进行了研究．研究得出了缓凝砂浆的强度和凝期与配比的关系,强度和凝期与温度的关系等．可见超效缓凝砂浆配置技术可广泛应用于预应力工程,应用前景广阔．     

碳化养护对冶金渣-熟石灰砂浆性质的影响

主要研究了碳化养护对冶金渣-熟石灰（SmS-SL）砂浆性质的影响,并通过XRD、真孔隙率和DTA/TG研究了影响机理和SmS-SL砂浆的环保效果.实验结果表明：碳化养护可提升SmS-SL砂浆的强度,改善它的体积稳定性和安定性.随着复合微粉中钢渣比例的提升,碳化养护对SmS-SL砂浆的增强效果逐渐提升,而对体积稳定性的改善效果却逐渐减弱.以钢渣为原料的SmS-SL砂浆的环保效果较为显著,其钢渣利用率达到27.8％,固碳率达到6.4％.     

基于废弃物利用的自保温墙体配套砂浆制备及性能研究

采用淤泥陶砂、废弃加气混凝土结合传热系数小的玻化微珠为砂浆骨料,基于"复合化"思想,制备自保温墙体配套砂浆。采用正交实验探讨混掺砂浆的合理配比,控制4项参数:胶凝材料用量、陶砂(或废料)与玻化微珠体积比、硅灰取代量和胶粉掺量,以干容重、抗压强度、导热系数为考核指标,制备综合利废效果最佳的新型混掺复合保温砂浆。结果表明,陶砂玻化微珠复合砂浆导热系数0.16～0.29W/(m.K),随着陶玻比增大而增大,因此陶砂体积含量增加有利于提高保温性能,加气废料玻化微珠复合砂浆的导热系数0.10～1.14W/(m.K),与陶砂复合保温砂浆相比,有较大的降低。     

A Comparative Study of the Use of Visual Communicative Signals in Interactions Between Dogs (Canis familiaris) and Humans and Cats (Felis catus) and Humans.

Dogs' (Canis familiaris) and cats' (Felis catus) interspecific communicative behavior toward humans was investigated. In Experiment 1, the ability of dogs and cats to use human pointing gestures in an object-choice task was compared using 4 types of pointing cues differing in distance between the signaled object and the end of the fingertip and in visibility duration of the given signal. Using these gestures, both dogs and cats were able to find the hidden food; there was no significant difference in their performance. In Experiment 2, the hidden food was made inaccessible to the subjects to determine whether they could indicate the place of the hidden food to a naive owner. Cats lacked some components of attention-getting behavior compared with dogs. The results suggest that individual familiarization with pointing gestures ensures high-level performance in the presence of such gestures; however, species-specific differences could cause differences in signaling toward the human. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

聚丙烯纤维对砂浆早期干缩性能影响的试验研究

通过聚丙烯纤维砂浆早期干燥收缩性能试验，研究了不同掺加量、不同长度的聚丙烯纤维和搅拌方式对砂浆早期干燥收缩性能的影响．试验表明，在砂浆中加入聚丙烯纤维能有效控制砂浆的早期干燥收缩率，当加入量为0．9kg／m^3时，干缩率降低了31．6％．同时研究了聚丙烯纤维对砂浆强度的影响，发现其抗拉强度和抗压强度分别提高了27．4％和12．1％．     

点荷法砂浆强度的简化换算公式

在GRC网格布加固空心砖砌体的受剪性能试验中，使用点荷法对144个砂浆试样进行了强度测试，通过与砂浆标准试件的抗压强度值相比较，表明点荷法是一种：隹确可靠的砂浆强度测试方法；文章对大量试验数据进行回归分析，提出了点荷法计算砂浆强度的换算修正公式，通过工程实践证明了该公式结论可靠，应用简便。     

捆绑式望远镜中间块对镜筒指向误差的影响分析

运用SolidWorks软件的静态分析模块,将捆绑式望远镜中间块的动态分析转化为0°~90°范围内,均匀分布的18个位置的静态分析。中间块每转动5°,对其上基面的镜筒连接圈的位移变化进行数据采集一次,计算出各镜筒之间的夹角变化值并进行对比,最终得到镜筒之间的最大指向误差。此方法为解决同类问题提供了参考价值。     

Strategies of using fly ash and their effect on properties of cement mortar

Abstract

Three different ways of using fly ash, namely, partial replacement of cement, or sand, or both cement and sand in the cement mortar, were studied in this investigation. The replacement varied from 10 percent to 60 percent by weight. The effects of design parameters such as water‐cement ratio and curing temperature on the replacements were studied. In this paper, strategies of using fly ash in concrete construction were also proposed in order to conserve resources.     

建筑无机保温砂浆在外墙外保温工程中的应用

对建筑无机保温砂浆材料的性能、施工特点和成本优势进行了介绍,分析了影响无机保温工程施工质量的因素,并通过采取一系列的施工措施来加强对无机保温工程施工质量的控制,以达到建筑节能的效果。