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《Construction and Building Materials》2000,14(1):17-23
The object of the study was the influence of chemically modified silica fume (MSF) on the sulfate resistance of cement-based materials. MSF is a liquid product prepared from a suspension of silica fume and a water solution of a reactant under the defined composition of suspension, defined ambient temperature and time of procedure. MSF is added into mortar or concrete mixtures instead of water in the quantities needed for the desired consistency. The results obtained at the application of MSF shows a significant increase of sulfate resistance of materials based on Portland cement slag blends and slag binder. This positive effect represents a further beneficial potential of MSF that has already been shown as an effective hardening accelerator together with its ability to increase the acidic resistance of materials based on Portland cement slag blends and slag binder. 相似文献
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《Construction and Building Materials》1999,13(5):271-277
The aim of the study was to estimate the conditions of the effectiveness of a novel use of silica fume in concrete. This represents chemically modified silica fume (MSF). The activity of MSF evidently is predominantly based on the production of calcium silicate hydrates in the binding systems resulting in the advantageous densifying of the formatted pore structure and in the increase in strength of the material. The results obtained have shown that MSF is a very effective admixture for the acceleration of hardening of mineral binder based materials. A very important fact is its high activity in the binding systems based on Portland cement slag blends with very low Portland cement content and on basic blast furnace slag alone. Therefore, MSF seems to be a prospective component for development for blend binders with very low content in Portland cement and untraditional binders based only on solid waste materials, predominantly containing calcium silicate and alumino silicate constitutions. MSF seems to be worthy of more detailed study on the effective utilisation of its positive effects. 相似文献
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煤矸石对水泥基材料海水中化学稳定性的影响 总被引:1,自引:0,他引:1
通过在人造海水侵蚀液中长期浸泡的试验,研究了煤矸石对水泥砂浆在海水中化学稳定性的影响,并与矿粉和粉煤灰进行了比较.结果表明,煤矸石能明显提高水泥砂浆抗海水化学侵蚀能力,但效果不如矿粉和粉煤灰.掺不同种类掺和料的水泥浆体其孔径的细化是其抗海水化学侵蚀能力提高的根本原因. 相似文献
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为研究两种水胶比粒化高炉矿渣高强水泥基材料的盐冻与自愈性能,利用快速冻融法进行盐冻与自愈试验。结果表明,经过500次盐冻循环后,粒化高炉矿渣高强水泥基材料的总体抗压强度下降率与普通石英砂高强水泥基材料类似;盐冻循环后经过适当养护,粒化高炉矿渣高强水泥基材料和普通石英砂高强水泥基材料的抗压强度均有提高。扫描电镜(SEM)及硬化混凝土气孔结构测定仪测试结果表明,不同冻融循环下的含气量均表明粒化高炉矿渣高强水泥基材料有一定的自愈能力。 相似文献
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钢渣机敏混凝土的性能研究 总被引:4,自引:0,他引:4
将钢渣掺入到水泥基体中,不仅起到增强作用,而且还可以改善其导电性。本文试验研究了钢渣水泥基材料在单轴压应力下的机敏性,并探讨了将其用作监测材料对混凝土内部损伤进行监控的可行性。结果表明,该导电混凝土在压应力作用下,电阻率的变化趋势可近似地符合二次多项式方程;随钢渣掺量增加,钢渣混凝土的机敏效应增强。 相似文献
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集料在水泥基材中具有重要的作用。混凝土材料中集料相与基体相对水泥基材料力学性能具有协同作用,表现出复合材料的力学行为。本文主要从集料品种、最大粒径、粒形、级配、碱活性等方面对混凝土强度、弹性模量及变形等方面的影响规律进行阐述。 相似文献
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针对水泥基材料受海水腐蚀的情况,通过质量损失率、抗压强度损失率、抗渗性能及外观分析,评价水泥基材料在10倍海水浓度各化学成分长期浸泡下的抗腐蚀性能。结果表明在海水的主要成分中,对水泥基材料侵蚀性能由大到小的顺序为MgSO4、K2SO4、MgCl2、NaCl。降低水胶比和添加掺合料可以有效提高水泥基材料抗海水腐蚀性能。在长期浸泡条件下,海水化学成分对水泥基材料的侵蚀破坏分别表现为Mg(OH)2和钙矾石的生成。主要侵蚀成分为Mg2+和SO42-,其中SO42-略严重,二者复合对水泥基材料侵蚀更加严重。 相似文献
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将块状锰合金渣破碎成颗粒后制备为连续级配的锰合金渣粗集料,并以25%、50%、75%和100%的取代率取代天然粗集料以研究其对路面混凝工作性能、力学性能和耐磨性能的影响。结果表明:锰合金渣粗集料的针片状颗粒含量和吸水率大于天然粗集料,但按照适当比例级配后适用于各类路面混凝土;路面混凝土的坍落度随着锰合金渣粗集料取代率的增大而有较大幅度的减小;锰合金渣粗集料取代率小于50%时对路面混凝土的力学性能和耐磨性能影响不大,取代率超过50%以后路面混凝土的力学性能和耐磨性能相对于基准组分别提高了约10%和30%,利用锰合金渣粗集料可制备性能优良的路面混凝土。 相似文献
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对水泥基材料表面处理是提高其耐久性和服役寿命的有效方法之一,但是目前的表面处理方法存在各种弊端。采用正硅酸乙酯(TEOS)和常用的表面处理剂硅酸钠对水泥基材料进行表面防护,研究其对水泥基材料强度、吸水量、抗氯离子渗透性能和抗碳化性能的影响。结果表明,TEOS对水泥基材料的性能提升具有较好的作用;采用TEOS处理后,水泥净浆、砂浆和混凝土的强度提高率分别为20.8%、10.2%、12.5%;TEOS相对于硅酸钠能够更好地减小碳化深度、氯离子渗透性能和吸水量;采用TEOS处理后,碳化深度减少51.4%,氯离子渗透深度减少50.0%,吸水量减少55.5%。 相似文献
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Serdar Aydn 《Fire Safety Journal》2008,43(8):610-617
The effects of high temperatures up to 900 °C on the mechanical properties and the microstructure of cement-based pumice mortars incorporating different amounts of ground granulated blast furnace slag (GGBFS) were investigated in this study. The residual compressive and flexural strength of mortar specimens were determined after exposure to high temperatures. The results have indicated that the effect of GGBFS incorporation on high-temperature resistance of pumice mortar is shown significantly at 900 °C. At this temperature level, the mortar containing 80% GGBFS exhibited only 23% and 28% compressive strength loss when cooled in air and water, respectively, where as mortars without GGBFS lost almost 70% of their strength. Furthermore, none of the GGBFS incorporated mortar specimens showed compressive strength loss up to 600 °C when cooled in air. The most severe conditions in terms of strength loss due to high temperatures were flexural loading and water cooling case. 相似文献
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聚合物水泥基防水涂料是一种新型、高效的双组份水性建筑防水涂料,代表着防水材料的发展方向之一。但目前聚合物水泥基防水涂料仍存在力学性能不够理想,耐水性、耐久性差等问题,限制了该类涂料的推广和应用。本文通过对丙烯酸酯系聚合物水泥防水涂料合理配合比设计及其涂膜物理性能测试,得出以下结论:JS(I)型涂料的液粉比可以适当减小,而涂膜物理性能组合得到优化;聚灰比是影响聚合物水泥基防水涂料物理性能的关键因素。 相似文献