共查询到19条相似文献,搜索用时 103 毫秒
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矿渣粉是较好的胶凝材料,尤其S105级高等级矿渣粉具有较高的活性。加入高品质矿渣粉的混凝土强度高、和易性能好、脱模快,能改善混凝土的抗渗性、抗冻性,增加塌落度。 目前市场应用的矿渣粉达到国家标准S105级的较少,市场份额大约不到5%;S95级矿渣粉市场份额只有35%以下,不能满足建筑市场尤其是国家重点建设工程的需要。高等级矿渣粉占比低的主要原因是矿渣粉活性指数低,达不到建筑工程设计要求。因此,找出矿渣粉活性低的原因,寻求提高其活性的方法,是大家十分关注并希望解决的问题。 相似文献
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早强助磨剂对矿渣粉磨作用的初探 总被引:1,自引:0,他引:1
高炉矿渣的易磨性差,早期强度偏低是生产矿渣微粉的两大难题。为了解决以上问题在实验室拟定了掺加早强助磨剂的试验方案,以研究能否达到降低粉磨时间,提高粉磨效率,提高早强的目的。试验证明,选用合适的早强助磨剂可以达到以上目的。 相似文献
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在给某搅拌站供S95级矿渣粉时,对方要求按GB/T18046-2008《用于水泥和混凝土中的粒化高炉矿渣粉》检测。在供应过程中,对方提出我公司的矿渣粉活性偏低,甚至有的不合格。我公司的矿渣粉一直定期做活性指数试验,并没有出现不合格现象,故认为造成这种结果的原因是出在对方的检验和用于做对比检验的水泥样品上。为此,做了分析和试验。 相似文献
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粒化高炉矿渣粉是水泥生产中的重要活性混合材料,矿粉活性的高低直接影响水泥产品质量。生产过程中存在磨机开停或检修后磨合阶段,此阶段所生产的矿粉存在细度偏粗、比表面积低、早期活性偏低等问题。针对此问题,我公司将该部分矿粉通过水泥磨头物料仓微机计量入磨与熟料、石膏和其它辅助混合材共同粉磨,达到稳定水泥质量,实现最终消化的目的。 相似文献
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钢渣-矿渣立磨联合粉磨助剂的研究与应用 总被引:1,自引:0,他引:1
以不同比例钢渣替代矿渣,并添加适量改性剂CHJ-S制备了复合粉。研究探讨了CHJ-S对复合粉细度、活性指数的影响,并通过SEM、MIP对掺加复合粉的硬化水泥浆体微观结构进行了分析。结果表明:掺入CHJ-S可有效改善钢渣-矿渣的易磨性,对于掺加20%钢渣的复合粉,其7d和28d活性指数略高于空白矿粉。CHJ-S可提前释放钢渣的膨胀,加速钢渣-矿渣复合粉的水化,生成更多的水化产物,改善了硬化浆体的孔隙结构。通过大磨生产综合分析,钢渣-矿渣立磨联合粉磨方案具有显著的经济效益和社会效益。 相似文献
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Utilization of fly ash and ground granulated blast furnace slag as an alternative silica source in reactive powder concrete 总被引:1,自引:0,他引:1
Reactive powder concrete (RPC) is an ultra high strength cement-based material. Cement and silica fume (SF) content of RPC are generally rather high compared to the conventional concrete. The aim of this study is to decrease the cement and SF content of RPC using with fly ash (FA) and/or ground granulated blast furnace slag (GGBFS). The effect of these mineral admixtures on compressive strength of RPC has been investigated under autoclave curing. In the first stage, the effect of autoclave time and SF content on compressive strength was determined. In the second stage, SF was gradually decreased and cement was replaced with FA and/or GGBFS at different proportions. The microstructure was investigated by scanning electron microscope (SEM). Test results indicate that, the utilization of FA and/or GGBFS in RPC is possible without significant mechanical performance loss. SEM micrographs revealed the tobermorite having different morphology. 相似文献
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Activation of blast furnace slag by a new method 总被引:3,自引:0,他引:3
Blast furnace slag is used as supplementary cementing material for the production of blended cement and slag cement. Its latently hydraulic properties can be activated by several methods. Most applications employ the use of high pH values in the pore solution (> 13.0) to accelerate the corrosion of the glass network of the slag.It is shown in this work that activation is also possible by lowering the pH to a range between 11.8 and 12.2 by the addition of calcium hydroxide and soluble calcium salts. Among the salts investigated in this study are calcium chloride, calcium bromide, calcium nitrate, calcium formate, and calcium acetate. Other salts can be used alternatively as long as they are able to increase the calcium ion concentration and thus reduce the pH in the pore solution via the calcium hydroxide equilibrium. Complex formation of organic anions with calcium ions in the pore solution is a serious handicap when using organic calcium salts.This concept was tested on a particular slag improving its early compressive strength. It was possible to increase the strength of mortar bars produced from the pure slag from 3 MPa to 25 MPa after seven days by adding calcium hydroxide, calcium carbonate and calcium acetate. The early strength of slag cement containing 80% slag was increased from 6 to 16 MPa after two days by adding calcium chloride. The final strength was increased from 36 to 53 MPa after 28 days (water/cement-ratio = 0.40, 20 °C).Analytical data is included to demonstrate that application of the aforementioned concept is able to increase heat liberation and degree of slag consumption. 相似文献
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当前,抗击新冠肺炎疫情正处在关键时期,各地建材企业克服市场需求不足、生产销售与物流受限、人员返岗不足,资金供应短缺等诸多困难,积极采取多种灵活有效的措施,应对当前疫情对行业、企业造成的冲击。为深入贯彻落实习近平总书记关于坚决打赢疫情防控阻击战的重要指示精神和党中央、国务院关于在做好疫情防控工作同时统筹抓好“六稳”工作的有关决策部署,引导建材行业广大企业坚定信心,有效采取各种措施,在切实加强疫情防控工作的前提下,因地制宜,因业、因企施策,根据上下游市场需求变化,全面筹划、合理有序部署好全年的改革发展,有效组织好当前的复工复产,努力推进行业发展和经济稳增长,保障生产经营顺利进行,继续扎实推进行业结构调整和高质量发展,确保全年各项发展任务和经济增长目标顺利实现。现提出如下指导意见 相似文献