【摘 要】
：
By means of "Mortar Bar Method",the ratio of cement to aggregate was kept as a constant 1∶2.25,the water-cement ratio of the mixture was 0.40,and six prism spe
【基金项目】
：
湖北省科技厅自然科学基金;湖北省武汉市科技局科研项目
论文部分内容阅读
By means of "Mortar Bar Method",the ratio of cement to aggregate was kept as a constant 1∶2.25,the water-cement ratio of the mixture was 0.40,and six prism specimens were prepared for each batch of mixing proportions with dimensions of 10×10×60mm3 at 38±2℃ and RH≥95%, the influences of content and particle size of active aggregate, sort and content of alkali component and type of slag on the expansion ratios of alkali-activated slag cement(ASC) mortars due to alkali aggregate reaction(AAR) were studied. According to atomic absorption spectrometry,the amount of free alkali was measured in ASC mortars at 90d.The results show above factors affect AAR remarkably,but no dangerous AAR will occur in ASC system when the amount of active aggregate is below 15% and the mass fraction of alkali is not more than 5% (Na2O).Alkali participated in reaction as an independent component, and some hydrates containing alkali cations were produced, free alkalis in ASC system can be reduced enormously.Moreover,slag is an effective inhibitor, the possibility of generating dangerous AAR in ASC system is much lower at same conditions than that in ordinary Portland cement system.
其他文献
随着我国高铁建设的不断加快，高铁已经延伸到国内广袤地域，因此软土路基的加固处理技术越来越重要。软土路基的稳固与否，直接影响道路的沉降问题。为了确保铁路施工的顺利进行，道
分析了双向有线广播电视网络改造的几种模式,提出了在双向HFC网络的改造中利用EPON+EOC/LAN技术方式.
The effects of mineral admixtures on fluidity,mechanical and hydrational exothermic behavior were studied.The results show that,double-adding ways,i e,fly ash a
本文针对食业会计电算化存在的一些问题,提出了加强和改进的思路,促进会计电算化健康发展,更好地提高会计工作水平.
Using Al-Mg and Al-Mg-Y alloys as raw materials and nitrogen as gas reactants, AlN powders and composite AlN powders by in-situ synthesis method were prepared.
A single-mode fiber acousto-optic (AO) switch based on a null coupler at wavelength of 1.55 μm is reported.According to the coupled mode theory,power distribut
Based on the idea of the set-membership identification, a modified recursive least squares algorithm with variable gain, variable forgetting factor and resettin
The distortion structure in nanocrystalline NiAl is studied using molecular dynamics simulation. The rounded grain boundaries in these nanograins are a direct s
The effects of Si, Mn and Al on the microstructure and mechanical properties of ADI weld have been studied. The microstructure of ADI weld metal mainly consists
参考国际及国外时医疗领域的相应标准,结合我国有关的规范、标准,对手术室供配电系统作出了探讨;论述了盯配电系统在医院的应用范围;分析了IT系统接地故障的特点;提出了医院