共查询到19条相似文献,搜索用时 125 毫秒
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试验将白云石岩屑磨细为粉体,用作混凝土掺和料,研究其易磨性、活性、碱-白云石活性及对混凝土力学性能和工作性能的影响。结果表明:白云石岩屑较水渣易粉磨,水渣粉磨4min时,平均粒径为18.01μm,白云石屑粉磨2min平均粒径即为4.28μm,而继续粉磨细度增长缓慢,且易结团黏聚;单独磨细白云石粉的活性低于62%,低于II级粉煤灰,而采用水渣与白云石共磨,使共磨复合掺和料的28d活性达到75%以上,较单独的白云石粉活性提高18%;在Na OH溶液中养护14d的基准试件及掺白云石粉试件膨胀率均低于0.1%,依据标准白云石粉作为掺和料不具有ACR活性危害;单掺白云石粉使混凝土早期和后期强度均降低,而白云石-水渣复合掺和料使混凝土早期强度略有增长。 相似文献
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矿渣微粉对水泥砂浆泌水性能影响的研究 总被引:3,自引:0,他引:3
采用不同比表面积、不同掺量的矿渣微粉,取代水泥配制水泥砂浆,研究磨细矿渣粉的比表面积、水泥取代率对砂浆泌水性能的影响。研究表明,在本试验条件下,磨细矿渣粉比表面积大于400m 2k/g时,随着比表面积的提高,水泥取代率的增加,砂浆的泌水量减少,和易性增加,水泥砂浆成本降低。 相似文献
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碱胶凝材料是利用磨细的高炉矿渣、粉煤灰、电热磷渣等工业废料或火山灰等天然矿物为原料,碱化合物或含碱工业废渣为激发剂制得的水硬性的胶凝材料。目前,社会上普遍关注的是环境问题和可持续发展问题,而碱胶凝材料的研制与开发实现了水泥工业的可持续发展和人与环境的相互协调,利用碱胶凝材料制备的生态混凝土工艺简单,原料来源广泛,同时在制备过程中能实现低造价和低能耗。 相似文献
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本文介绍了磨细水淬高炉矿渣在靠椅山大桥工程中的应用情况,并就磨细矿渣在桩基耐腐蚀混凝土、墩身泵送混凝土、T型梁C50高强混凝土中的作用机理进行了阐述。同时简要叙述了保证混凝土施工质量的具体控制措施。 相似文献
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钢渣微粉对高强混凝土性能的影响 总被引:2,自引:0,他引:2
试验对比研究了钢渣微粉对混凝土工作性、抗压强度、体积稳定性以及耐久性的影响.结果表明,钢渣微粉可以显著改善混凝土的工作性,但也导致了混凝土凝结时间的延长.相对于粉煤灰和矿粉,钢渣微粉的活性略低,配制出的混凝土早期强度略低,但钢渣微粉可以与粉煤灰或矿粉双掺而产生超叠加效应.且钢渣微粉可以显著降低混凝土的于燥收缩,提高混凝土的抗氯离子渗透性能,对混凝土的抗冻性也无不利的影响. 相似文献
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Mustafa Sarıdemir İlker Bekir Topçu Fatih Özcan Metin Hakan Severcan 《Construction and Building Materials》2009,23(3):1279-1286
In this study, artificial neural networks and fuzzy logic models for prediction of long-term effects of ground granulated blast furnace slag on compressive strength of concrete under wet curing conditions have been developed. For purpose of constructing these models, 44 different mixes with 284 experimental data were gathered from the literature. The data used in the artificial neural networks and fuzzy logic models are arranged in a format of five input parameters that cover the age of specimen, Portland cement, ground granulated blast furnace slag, water and aggregate, and output parameter which is 3, 7, 14, 28, 63, 90, 119, 180 and 365-day compressive strength. In the models of the training and testing results have shown that artificial neural networks and fuzzy logic systems have strong potential for prediction of long-term effects of ground granulated blast furnace slag on compressive strength of concrete. 相似文献
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In the present study, split tensile strength together with pore structure, thermal behavior and microstructure of concrete containing ground granulated blast furnace slag and SiO2 nanoparticles have been investigated. Portland cement was replaced by different amounts of ground granulated blast furnace slag and the properties of concrete specimens were measured. Although it negatively impacts the properties of concrete at early ages, ground granulated blast furnace slag was found to improve the physical and mechanical properties of concrete up to 45 wt% at later ages. SiO2 nanoparticles with the average particle size of 15 nm were partially added to concrete with the optimum content of ground granulated blast furnace slag and physical and mechanical properties of the specimens were studied. SiO2 nanoparticle as a partial replacement of cement up to 3 wt% could accelerate C-S-H gel formation as a result of increased crystalline Ca(OH)2 amount at the early age of hydration and hence increase split tensile strength of concrete specimens. The increased the SiO2 nanoparticles’ content more than 3 wt% causes the reduced the split tensile strength because of the decreased crystalline Ca(OH)2 content required for C-S-H gel formation. SiO2 nanoparticles could improve the pore structure of concrete and shift the distributed pores to harmless and few-harm pores. 相似文献
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掺矿渣微粉混凝土的抗冻性试验研究 总被引:5,自引:1,他引:5
研究了掺矿渣微粉的混凝土的抗冻性能,分析了矿渣微粉掺量及与粉煤灰复合掺入对混凝土抗冻性能的影响规律。试验结果表明,采用S95矿渣微粉及高效减水剂配制的C30级混凝土具有低御300次快速冻融循环的能力。 相似文献