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阐述了粉煤灰与其他废渣生产复合砖,对粉煤灰、赤泥、钢渣等原料的性能进行了分析,并且给出了粉煤灰与废渣生产复合砖的生产工艺流程以及试验结果. 相似文献
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在以粉煤灰为主的胶结料中掺入适量的矿渣能大幅度提高其强度,矿渣掺量以控制在15% ̄25%为宜;石灰对粉煤灰和矿渣都起激发剂的作用,在本试验范围内,石灰适宜掺量为15% ̄25%;粉磨细度与强度成正比关系,综合考虑产量、质量与电耗的关系,胶结料的比表面积控制在420 ̄450m2/kg。以粉煤灰、矿渣、石灰和石膏配置的胶结料,后期强度能大幅增长,凝结时间可调,抗大气稳定性较好。若采用蒸养技术,可得到3d抗压强度达45MPa以上,后期抗压强度能继续增长的硅酸盐制品。 相似文献
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山西阳泉市1995年修建了一栋完全用自燃煤矸石建造的12层框架住宅楼,建筑面积为7436.74m2,该楼于1997年3月通过科研验收,投入使用后整体情况良好。1建筑设计本工程由阳泉市建筑设计院设计,设计的基本情况为:(1)该建筑的总面积为7436.74m2,主体12层,层高2.8m,另有地下室和水箱塔 相似文献
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Rajan Saha Kyle Malloy Emil Bautista Konstantin Sobolev 《Frontiers of Structural and Civil Engineering》2017,11(4):380-387
Atomic Force Microscope (AFM) is a relatively new technique for investigation of construction materials. In this study AFM was used to investigate the interaction of asphalt binder with fly ash. Fly ash is a coal combustion byproduct of electric power utilities having pozzolanic properties and commonly used in Portland cement concrete. In this study, an investigation was made by using different types of fly ash with two types of asphalt binders such as PG 58-28 and PG 64-28. Asphalt microstructure is divided into four subgroups such as Saturates, Aromatics, Resins and Asphaltenes (SARA). These four phases can be distinguished by the atomic force microscope. The interaction of these phases affected by introducing fly-ash was investigated and correlation with rheological properties was observed. 相似文献
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粉煤灰与其它废渣生产复合砖(一) 总被引:1,自引:0,他引:1
粉煤灰与赤泥、碱矿渣、铅锌矿尾砂、高炉渣、钢渣等工业废渣,可以生产废渣复合砖,经有关部门测试其抗压强度达到19或20MPa以上、抗折强度可达6MPa以上。1赤泥粉煤灰复合砖1.1原材料1.1.1赤泥赤泥的化学成分见表1。表1赤泥的化学成分%SiO2CaO Fe2O3Al2O3Na2O其他烧失量19.5050.007.1011.102.3010.0021.10赤泥的物理性质为:相对密度2.7~3.9;密度0.8~1g/cm3;粒径0.08~0.25mm,含水率小于20%。赤泥的矿物组成见表2。表2赤泥的矿物组成β2CaO·SiO2533CaO·Al2O3·0.6SiO2·4.9H2O7Na2O·Al2O3·1.7SiO2·2H2O6Na2O·Al2O3·2… 相似文献
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为了提高高性能胶结材料的强度,试验对硅灰、粉煤灰等材料的掺配比例不同时的胶结材料抗折强度、抗压强度影响规律进行了研究,结果显示:掺入粉煤灰和硅灰取代部分水泥用量,可较好地改善胶结材料的强度和工作性能。 相似文献
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1 前 言 粉煤灰在建筑、建材方面的应用,无论从技术角度,还是从经济角度看,都是好的,在政策支持上也不存在问题。目前之所以难以全面推广,主要原因在于使用不便,亦即粉煤灰产品的商品化程度较低。为此作者利用一般水平的发电厂排出的皿级粉煤灰,先后研制开发了可等量取代水泥的活化粉煤灰混凝土掺合料、砌筑水泥、地下工程水泥、油井水泥、大坝水泥、喷射水泥、路基水泥。蒸养水泥、建筑砂浆粉、免蒸免烧砖胶结料、煤矿灭火充填料等一系列专用粉煤灰胶凝材料,目的就是使得这类粉煤灰商品可以直接面向用户。2 系列活化粉煤灰胶凝材… 相似文献
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粉煤灰与其它废渣生产复合砖(二) 总被引:1,自引:0,他引:1
4高炉石灰复合砖某钢铁厂原每年排放大量炼钢废渣,积存有200万t。采用高炉渣水淬新工艺后,罐壳重渣每年仍有5万t排放量需要处理,这给高炉废渣生产复合砖提供了条件。4.1原材料高炉渣等原材料生产复合砖有:高炉矿渣、水泥、石灰和外加剂。某铁厂排出的高炉矿渣具有活性,结构稳定好。其化学成分见表15。表15某钢铁厂高炉渣化学成分名称CaO SiO2Al2O3MgO Fe2O3MnO其他含量,9.8031.9015.906.441.540.3≤4.124.1.1高炉矿渣高炉矿渣自身水化胶凝能力很弱,也较缓慢。它在砖中主要起骨料作用,通过筛选将颗粒粒径控制在3mm以下。实践证明,高炉… 相似文献
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采石场尾矿、高炉重矿渣、增钙液态渣、自燃煤矸石、粉煤灰等基本性能研究的基础上,以此为原料研制混凝土多孔砖,为工业废渣的综合利用开辟了有效途径.工业化生产的混凝土多孔砖,其各项指标符合JC 943-2004<混凝土多孔砖>标准的技术规定,研究人员还系统研究了碳化系数、软化系数、隔声性能、抗冻性能及保温性能. 相似文献
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This paper presents the effects of aggregate properties such as strength, porosity, water absorption, bulk density and specific gravity on the strength and durability of lightweight fly ash aggregate concrete (LWAC). The influence of properties of four aggregates (sintered lightweight fly ash aggregates, cold-bonded lightweight fly ash aggregate and normalweight aggregate) on mechanical and durability properties of concrete is discussed. Experimental results revealed that durable high-strength air-entrained lightweight concretes could be produced using sintered or cold-bonded lightweight fly ash aggregates, having comparable performance with the normalweight concretes. The use of lightweight aggregates (LWA) instead of normalweight aggregates in concrete production decreased the strength and stiffness due to the higher porosity and lower strength of the aggregate included in the concrete. However, permeability of sintered fly ash aggregate lightweight concretes was comparable and slightly lower than normalweight concrete whereas permeability of cold-bonded fly ash lightweight concrete was greater than the others. All concretes had a durability factor greater than 85, which met the requirements by showing quite perfect resistance to freeze–thaw. 相似文献
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使用粉煤灰和碱激发剂制备粉煤灰基土壤聚合物混凝土,并系统研究其物理力学性能、干缩和耐久性能。粉煤灰基土壤聚合物混凝土早期强度相对较低,后期增长明显。粉煤灰基土壤聚合物砂浆的干缩主要发生在早期,14d龄期后的干缩率均显著小于普通水泥砂浆,在150d龄期时为普通水泥砂浆的71.8%。硫酸盐侵蚀试验表明:在3%硫酸钠溶液中,粉煤灰基土壤聚合物砂浆没有产生任何膨胀,具有优良的抗硫酸盐侵蚀性能。即使粉煤灰基土壤聚合物含碱量高达10.6%,也不会产生危害性的碱-硅酸反应。粉煤灰基土壤聚合物混凝土快速碳化28d的碳化深度为14.0mm,抗冻等级在F100以上。自然浸泡法试验表明:粉煤灰基土壤聚合物混凝土的水溶性氯离子有效扩散系数为1.79×10-12m2/s,是混凝土的30.5%,具有比普通混凝土更好的抗氯离子侵蚀性能。粉煤灰基土壤聚合物混凝土具有适用的物理力学性能,较低的干缩,优良的耐久性能,是一种新型的结构材料。 相似文献
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《Construction and Building Materials》2007,21(6):1295-1300
About 10 million tonnes of fly ash are produced yearly as waste from coal fired thermal power plants in Turkey. Only a small portion of this waste is utilized as a raw material in the production of cement and concrete. In this study, Seyitömer power plant fly ash was investigated in the production of light weight bricks. Fly ash, sand and hydrated lime mixtures were steam autoclaved under different test conditions to produce brick samples. An optimum raw material composition was found to be a mixture of 68% fly ash, 20% sand and 12% hydrated lime. The optimum brick forming pressure was 20 MPa. The optimum autoclaving time and autoclaving pressure were found 6 h and 1.5 MPa, respectively. The compressive strength, unit volume weight, water absorption and thermal conductivity of the fly ash–sand–lime bricks obtained under optimum test conditions are 10.25 MPa, 1.14 g/cm3, 40.5% and 0.34 W m−1 K−1 respectively. The results of this study suggested that it was possible to produce good quality light weight bricks from the fly ash of Seyitömer power plant. 相似文献