共查询到20条相似文献,搜索用时 62 毫秒
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采用正交试验分析,研究了粉煤灰掺量、矿渣掺量、水灰比对泡沫混凝土性能的影响关系。试验结果表明,在双掺粉煤灰矿渣泡沫混凝土中,矿渣掺量对泡沫混凝土抗压强度有显著地影响,随着矿渣掺量的增加,泡沫混凝土的抗压强度不断增加,并且导热系数也随之增加。当矿渣掺量为10%时,双掺粉煤灰矿渣泡沫混凝土具有最低的导热系数。 相似文献
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Zhang Qing-fang 《建筑技术开发》2007,34(4)
充分利用了矿渣和粉煤灰这些工业废渣及其活性特点进行试验。该试验所研究的混凝土强度等级为 C30,选用42.5强度等级的普通硅酸盐水泥,通过对8种方案进行试配,测试分析混凝土的性能和混凝土4个龄期的抗压强度,通过对各种配合比的矿渣粉煤灰混凝土各龄期抗压强度与基准混凝土同龄期抗压强度的对比分析,找出理想的矿渣粉煤灰混凝土的配合比。总结了每种方案中最佳配合比掺量。 相似文献
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研究了钢渣粉与粉煤灰二元复合配制混凝土的工作性能和力学性能,分析比较了复合型掺合料的混凝土与单掺一种掺合料的混凝土的差异,并得出了一些指导性结论。 相似文献
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本文针对用比表面积为4000cm^2/g的磨细矿粉和粉煤灰配制成的C60级的高性能混凝土,探讨了各自的作用机理和叠加效应。 相似文献
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大体积混凝土易出现温度裂缝,利用粉煤灰和矿粉双掺技术的配合比设计控制裂缝的出现。临沂市商业银行营业服务大楼工程基础筏板采用60d强度粉煤灰、矿粉双掺的配合比。结果表明,双掺配比中筏板内部水化热温度低,无裂缝出现,并且降低成本。 相似文献
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通过超细矿渣粉与Ⅱ级粉煤灰在混凝土中的力学试验,研究了双掺矿渣粉和粉煤灰对混凝土工作性及强度的影响,对测试结果进行了分析,得出了合理可行的双掺路线。 相似文献
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M.L. Berndt 《Construction and Building Materials》2009,23(7):2606-2613
The suitability of using more “sustainable” concrete for wind turbine foundations and other applications involving large quantities of concrete was investigated. The approach taken was to make material substitutions so that the environmental, energy and CO2-impact of concrete could be reduced. This was accomplished by partial replacement of cement with large volumes of fly ash or blast furnace slag and by using recycled concrete aggregate.Five basic concrete mixes were considered. These were: (1) conventional mix with no material substitutions, (2) 50% replacement of cement with fly ash, (3) 50% replacement of cement with blast furnace slag, (4) 70% replacement of cement with blast furnace slag and (5) 25% replacement of cement with fly ash and 25% replacement with blast furnace slag. Recycled concrete aggregate was investigated in conventional and slag-modified concretes. Properties investigated included compressive and tensile strengths, elastic modulus, coefficient of permeability and durability in chloride and sulphate solutions. It was determined that the mixes containing 50% slag gave the best overall performance. Slag was particularly beneficial for concrete with recycled aggregate and could reduce strength losses. Durability tests indicated slight increases in coefficient of permeability and chloride diffusion coefficient when using recycled concrete aggregate. However, values remained acceptable for durable concrete and the chloride diffusion coefficient was improved by incorporation of slag in the mix. Concrete with 50% fly ash had relatively poor performance for the materials and mix proportions used in this study and it is recommended that such mixes be thoroughly tested before use in construction projects. 相似文献