共查询到19条相似文献,搜索用时 62 毫秒
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目前,矿渣粉的制备,国外普遍采用立式磨+选粉机组成圈流系统的生产工艺,国内除极个别企业采用该工艺外,多数为小型球磨机,开流系统。立式磨生产的主要特点是单机产量高、能耗低,但一次性投资较大,国内一般企业难以承受。而小型球磨机开路生产又存在单机产量低、能耗高、产品细度不易控制等缺陷,故难以承担起大批量生产的重任。不过,球磨机的优势是技术成熟,运转可靠,操作简单。对此,我们经过全面分析,结合自身实际情况,选择了南京水泥设计研究院开发的Φ3.0m×11m两仓球磨机和XWXK19高效组合式选粉机,组成圈流生产系统,建成了年产10万t矿… 相似文献
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掺粒化高炉矿渣微粉混凝土的性能 总被引:2,自引:0,他引:2
1 前言粒化高炉矿渣是钢铁厂高炉炼铁时的副产品 ,它是熔融高炉渣经水急冷后得到的一种粒状物。由于经水急冷 ,矿物质来不及结晶 ,因此大部分为玻璃质 ,保持了较高的潜在活性。粒化高炉矿渣长久以来 ,一直作为水泥混合材使用。由于水淬矿渣比水泥熟料难磨 ,所以在水泥中矿渣粒度较粗。除了较细的颗粒活性得到发挥外 ,较粗颗粒矿渣活性没有得到发挥 ,仅起到微集料的作用。本世纪 50年代以来 ,南非、英国、美国、加拿大、日本等先后单独用细磨的粒化高炉矿渣粉取代一定量的水泥作为混凝土掺合料用于混凝土中。近代的高炉矿渣粉的概念不同于粒… 相似文献
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高炉矿渣微粉对水泥性能的影响 总被引:4,自引:0,他引:4
根据市散办与万安企业总公司1997年7月8日签定的《高炉矿渣微粉生产技术及开发研究(工业性生产)》的科研合同,我厂化验室制定了试验计划,于1997年8月开始,在金山水泥厂生产的P·O525和P·S425水泥中,按一定比例掺入不同比表面积的高炉矿渣微粉... 相似文献
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1前言 随着新型干法水泥的发展,高标号优质熟料的市场占有量逐步增大。优质高标号熟料为提高混合材掺量,生产复合水泥提供了有利条件,如何提高混合材的潜在活性,最大限度的提高混合材掺加量,同时充分考虑高掺量水泥的施工使用性能等,已成为大家关注的焦点问题。 相似文献
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为了推动高炉矿渣粉在我国水泥与混凝土工程中的应用 ,规范该产品的品质 ,由中国建材研究院 ,冶金建筑研究总院和宝钢集团企业开发总公司负责起草了粒化高炉矿渣粉国家标准。GB/T1 80 4 6主要是参照 ASTMC989-95和 JISA62 0 6-1 997两个标准结合我国国情制定的。1 关于适用范围粒化高炉矿渣细磨作为水泥或混凝土的掺合料 ,用于提高强度并改善其他性能 ,可以较大地提高粒化高炉矿渣的利用价值。矿渣单独粉磨后掺入硅酸盐水泥混匀的矿渣水泥 ,或作为单独组分掺入混凝土所取得的效果已得到证明。美、英、加、法、日、澳等国都制定相应的… 相似文献
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采用不同掺量的粒化高炉矿渣微粉(GGBS)对淤泥质土进行固化处理,利用动三轴试验,确定GGBS的最优掺量,并分析最优掺量固化土在不同围压下的动强度、动弹性模量和动阻尼比的变化规律,最后利用SEM和EDS分析固化土的微观结构和元素变化,揭示其固化机理。结果表明,当GGBS掺量为20%(质量分数,下同)时,固化土动强度呈台阶式增大,20%为最优掺量。20%掺量固化土动强度是淤泥质土的2~4倍,增大45~60 kPa,动弹性模量最大值是淤泥质土的3~4倍,动阻尼比相对减小,100 kPa和150 kPa围压下动阻尼比减小尤为明显。SEM照片显示,20%GGBS掺量的固化土颗粒成团聚状,颗粒间的孔隙大大降低,土体变得相对致密。EDS能谱显示,大量的Ca2+发生离子交换团粒化作用,从而增强了土颗粒之间的结合力,土颗粒的内摩擦角变大,土体的强度也随之提高。 相似文献
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《Cement and Concrete Research》1986,16(5):662-670
The objective of this study is the characterization of slags from different sources by their chemical composition, glass content, rate and total heat of hydration and compressive strength development with a view to establish a relationship between some of their properties and compressive strength. Binders incorporating 50 per cent slag present the same classification derived from total heat evolved as from slag activity indexes. 相似文献
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粒化高炉矿渣的水化机理探讨 总被引:8,自引:0,他引:8
以上海梅山钢铁公司的矿渣为研究对象,探讨粒化高炉矿渣在无激发剂存在的条件下的水化机理,并建立矿渣水化反应过程的化学模型。为矿渣的大规模、无害化、资源化和高附加值利用奠定理论基础。研究表明:在没有化学激发剂存在的条件下,梅山矿渣的水化产物是水化硅酸钙C2SH(C)、水化硅酸钙2CaO·SiO·(2 ̄4)HO和钙铝黄长石22Ca2Al(Al,Si)2O7。初期的水化过程是矿渣中的Ca2 等网络改变体阳离子与水中的H之间的置换,随着这种置换反应的进 行,溶液中的pH值不断升高,当pH高到一定程度时,矿渣颗粒表面上的HSiO4的溶解度将提高,溶解了的各种形态4的硅酸离子和溶液中的Ca2 、OH反应生成水化硅酸钙凝胶。 相似文献
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A.M. Alshamsi 《Cement and Concrete Research》1997,27(12):1851-1859
The heat of hydration of cement mixes is of great importance to civil engineers. A testing setup was developed to provide a continuous recording of temperature inside cement mixes by means of a computer, digital voltmeter, and thermo-couples. Four mixes were tested by the suggested testing setup. A plain normal Portland cement (NPC), 90% NPC/10% microsilica, 40% NPC/ 10% microsilica/50% ground granulated blast furnace slag (ggbs), and 50% NPC/50% sand mixes were used. Microsilica reduced the temperature rise in paste and ggbs reduced it even further. Cement content was seen, as expected, to have significant effect on the rise in hydration temperature. Cement replacement materials had also clear effect on the time needed to reach the peak temperature. Microsilica slightly accelerated the arrival time at peak temperature, whereas ggbs significantly delayed it. Moreover, ggbs clearly reduced the differential change in temperature as a function of time compared to the other mixes. 相似文献
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Investigation of hydraulic activity of ground granulated blast furnace slag in concrete 总被引:3,自引:0,他引:3
Ground granulated blast furnace slag (GGBFS), a by-product of the steel manufacturing industry, being used as an effective partial cement replacement material, has already been proven to improve several performance characteristics of concrete. The reactivity of GGBFS has been found to depend on the properties of slag, which vary with the source of slag, type of raw material used, method and the rate of cooling. The present work aims at bringing out a novel relationship between the Hydraulic Index (HI) of slag at 7 and 28 days (HI7 and HI28) and the influencing properties of slag, namely, glass content, fineness and chemical composition by employing multiple regression analysis on 37 slag samples from various sources. HI7 and HI28, thus obtained, have been mapped onto a Slag Activity Index (SAI) plot, giving an indication of the ranges of strength of slag. 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