【作者】 何涛；

【导师】 赵青林；

【作者基本信息】 武汉理工大学 ， 建筑材料与工程， 2011， 硕士

【摘要】 随着经济的飞速发展,各种大型的高层、超高层或地下工程建设规模同益增大,对工程安全性的要求也逐渐提高,灌浆是解决上述问题的一个重要方法,并且对我国的基础建设具有很重要的意义。一方面,随着节能减排的日益推进,结合中国现有的资源,利用粒化高炉矿渣制备出低污染有绿色之称的超硫酸盐水泥(SSC)制备低水灰比灌浆材料。通过力学性能的研究表明,在矿渣掺量为80%以上时,选取合适的碱性激发剂,28d抗压强度能够达到60MPa,硅灰以及偏高岭土对碱性激发剂掺量1%、3%的SSC灌浆料3d强度影响较大,但是对其28d强度影响值很小；通过料浆流动性能研究表明,硅灰较偏高岭土对SSC灌浆料的流动性影响较大,聚羧酸型减水剂较三聚氰胺型减水剂提高SSC灌浆料流动性较好,进一步通过力学性能研究得出两种减水剂对强度值影响差异很小；通过SSC膨胀性能研究得出,减水剂引入后对SSC硬化浆体收缩膨胀值有明显影响作用,具体表现为未掺减水剂时浆体未表现出收缩现象,掺后在不同龄期会有收缩现象出现。水灰比以及养护方式对SSC硬化浆体收缩影响不同,恒温空气中养护时都表现出收缩,当碱性激发剂在1%掺量时水浴养护都表现出微膨胀现象；通过碳化性能试验表明SSC碳化的主要原因是由于水化产物多为钙矾石,其易形成多孔骨架结构,所以外界二氧化碳易进入硬化浆体内进行酸碱反应,通过引气剂的发泡阻断连通孔以及微集料填充紧密效应综合处理能有效改善SSC碳化率；通过对SSC硬化浆体微观性能分析,得出其主要水化产物为钙矾石与水化硅酸钙凝胶,此外产物中还有大量结晶的二水石膏、无水石膏及未反应的粒化高炉矿渣,在此基础上提出SSC水化历程图。另一方面,为了满足某些特细砂或者较细空隙加固要求时,需要较高水灰比,所以本文制备出水灰比分别为1.0、1.5、2.0、3.0灌浆材料。在满足高流态的同时也能满足料浆的稳定性要求,且得出温轮胶对料浆的稳定效果最好,纤维素醚对料浆的稳定性效果最差；减水剂中三聚氰胺与温轮胶的配伍性能最好；水灰比对固砂强度影响较大,外加剂对强度影响值较小,在28d时,水灰比分别为1.0、1.5、2.0、3.0时,其固砂强度分别达到15.4MPa、3.9 MPa、1.6 MPa、0.9 MPa；对不同料浆的流变性能测试并计算其流变模型均与Herschel-Bulkey模型有良好的匹配度,相关系数都在0.96以上；料浆的粘度值主要取决于料浆的水灰比、料浆本身水泥水化的时间以及柠檬酸的掺量三者之间的关系,并不是受到单一因素的影响；料浆的触变性在水灰比为1.0与水灰比为1.5时主要受料浆的水化时间影响较大,但是在水灰比为2.0与水灰比为3.0时受到柠檬酸的影响较大。更多还原

【Abstract】 With the rapid economic development, the scale of various kinds of high-rise block, skyscraper or underground engineering has become increasingly large, requirements for the security of the project has also gradually enhanced, grouting is an important way to solve those problems above.On the one hand, with the push of energy conservation and emission reduction, combined with the resources available in China, Super sulfate cement (SSC) known as "green" of low pollution prepared by using graining blast furnace slag can prepare the grouting materials of low water-cement ratio. The results showed that when the content of slag is above 80%, the compressive strength of 28 days can reach 60MPa above. Silica fume has more influence on the liquidity of the SSC grouting materials than metakaolin, the polycarboxylate superplasticizer can improve the liquidity of SSC grouting materials greater than melamine water-reducer, but these two water-reducers has little difference of the effect on the value of the strength. The introduction of the water-reducer can affect the values of contraction-expansion of SSC paste, incorporating that paste show no any phenomena of shrinkage without adding the water reducer and appear shrinkage after the addition of the water-reducer in different ages. Silica fume and metakaolin have great effect to the strength of 3 days of the SSC grouting material with the mixing alkaline activator amount of 1%, 3%, but have little influence to the strength of 28 days. Water-cement ratio and curing way affect the shrinkage of the SSC paste differently, the SSC paste show shrinkage by the curing process of constant temperature in air, and show slight expansion by the water curing when the mixing amount of alkaline activator is 1%.The main reason of the carbonation of the SSC paste is that the hydration products is mostly ettringite which is easy to form porous skeleton structures. So the CO2 from outside is liable to intrude the paste to conduct acid-base reaction. The carbonation rate of SSC can be improved by the foaming of the air-entraining agent to block the interlocking pore and by the filling and tightly-piled effect of the microaggregates.The main hydration products are ettringite and hydrated calcium silicate gel by the micro-analysis of the SSC paste, abundance of gypsum crystals included. On this basis, the figure of the SSC hydration process is proposed.On the other hand, it requires high water-cement ratio to meet requirements of some superfine sand or the reinforcement of finer interspace, the grouting materials are prepared with the water-cement ratio of 1.0,1.5,2.0,3.0 in this paper respectively.lt should meet the high flow state and the stability of the paste, and the result showed that the welan gum was the best stabilizer and the cellulose ether is the worst stabilizer. Coordinated with the melamine, the welan gum can create the best result. The water-cement ratio affected the strength greatly, the admixtures little opposed, when the water-cement ratio were 1.0,1.5,2.0,3.0 and its strength were 15.4MPa,3.9MPa,1.6MPa,0.9MPa respectively at 28 days. The rheological properties were tested and the rheological modelcalculated which had good match with the Herschel-Bulkey Model with the correlation coefficient beyond 0.96.The viscosity value of the paste mainly depends on the relationship amongst the water-cement ratio, the hydration time of the slurry itself, and mixing amount of the citric acid, not by a single factor. The thixotropy of the paste was influenced mainly by the hydration time of the slurry when the water-cement ratio was 1.0 and 1.5, and by the citric acid when the water-cement ratio was 2.0 and 3.0.更多还原