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干混砂浆中材料组分对性能的影响 总被引:1,自引:0,他引:1
干混砂浆是由水泥、细集料、矿物掺合料、化学外加剂等材料组分均匀混合而成的新型建筑材料。本文主要探讨了矿渣、减水剂和可再分散聚合物粉末对干混砂浆性能的影响。 相似文献
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预拌砂浆是一种新型绿色建筑材料,是在专业生产厂内将水泥、砂、矿物掺合料和各种功能性添加剂按一定比例混合而成的混合物,其在节约资源、保护环境、提高工程质量等方面发挥着显著的作用。本文分析了预拌砂浆运用与发展,并对预拌砂浆使用进行了总结。 相似文献
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干粉砂浆中常用添加剂及作用 总被引:2,自引:1,他引:1
对干粉砂浆中常用添加剂定义和分类进行了综述,分析了常用矿物添加剂和化学外加剂及纤维对干粉砂浆性能的影响,并探讨了这些添加剂的作用机理,对配制干粉砂浆和治理硬化砂浆出现的问题具有重要意义。 相似文献
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干混砂浆的技术优势与推广策略 总被引:5,自引:0,他引:5
干混砂浆(dry—mixed mortar),又称砂浆干混(混)料.系指由专业生产厂家生产的。经干燥筛分处理的细集料与无机胶结料、保水增稠材料、矿物掺合料和添加剂按一定比例混合而成的一种颗粒状或粉状混合物。它可由专用罐车运输至工地加水拌和使用。与传统砂浆相比。干混砂浆具有以下技术优势: 相似文献
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利用废砖粉作为矿物掺合料分别取代10%、20%和30%水泥量制备干粉砂浆,通过对干粉砂浆的28d抗压强度、稠度、保水率和14d拉伸黏结强度等性能研究。结果表明:废砖粉具有一定的水化活性,可以作为矿物掺合料制备干粉砂浆。 相似文献
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干粉砂浆的应用及发展方向 总被引:1,自引:1,他引:0
为了适应现代建筑业发展的需要,人们研制出具有优良特性的新型的干粉砂浆。干粉砂浆又称干混砂浆或砂浆干拌料,系指由专门的厂家生产的一种新型建筑砂浆品种。其主要由胶凝材料、细骨料以及掺合料和化学添加剂等经干燥、计量、混合系统混合均匀后袋装或散装运至施工现场加水搅拌直接使用的砂浆产品。 相似文献
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研究了珊瑚砂-水泥砂浆(珊瑚砂浆)的力学性能,以及复合矿物掺和料对珊瑚砂浆的改性作用,并与标准砂浆进行对比.采用扫描电子显微镜-能量弥散X射线谱(SEM-EDS)、X射线衍射(XRD)和傅里叶变换红外光谱(FTIR),对砂浆力学性能、体积稳定性和水化作用的微观机理进行了研究.结果表明:珊瑚砂浆的力学强度低于标准砂浆,加入复合矿物掺和料后可改善水泥石基体及界面过渡区的微观结构,提高珊瑚砂浆的力学性能,使其28d抗压强度较标准砂浆提高了2.1%;珊瑚砂凹凸不平的表面能与硬化水泥浆体形成紧密的啮合状态,有助于提高砂浆的体积稳定性;珊瑚砂的内养护作用使砂浆的力学性能和抵抗收缩能力得到了提高;粉煤灰和矿粉的微集料填充作用和火山灰效应,提高了珊瑚砂浆的力学性能和抗氯离子扩散能力;珊瑚砂持续释放出的Ca^2+、Mg^2+参与了水泥的水化反应,有助于生成更多的水化产物. 相似文献
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水泥砂浆韧性改善的试验研究 总被引:2,自引:0,他引:2
引入缓慢弯曲试验法,对水泥砂浆的增韧改性进行了试验研究。结果发现,适量掺加沸石矿粉,对水泥砂浆韧性的提高有一定贡献;适量引气剂的掺入,可以在较大程度上提高其断裂能;合理加大砂灰化,也是提高水泥砂浆断裂能(韧性)廉价而有效的方法之一。 相似文献
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At this moment there is no national specification concerning the application of desert sand with very fine grain. To be able to apply desert sand to mortar and concrete in civil engineering, mortar and concrete made of Tenggeli desert sand and Maowusu sandy land sand have been tested in order to clarify their engineering characteristics. Based on the determined chemical composition and the physical characteristics of desert sand, the mechanical properties of mortar and concrete made of two types of desert sand as fine aggregate were investigated. The results of the tests indicate that desert sand can be used as a fine aggregate in mortar and concrete for general civil engineering. 相似文献
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The cathode ray tubes (CRTs) glass of discarded computer monitors and television sets are identified as hazardous materials due to its high content of lead, however, nowadays appropriate CRT glass remediation technologies are insufficient. This research work studies the feasibility of CRT glass (MG, G) use in the mortar as natural river sand fine aggregate replacement. Fly ash (F) and ground granulated blast-furnace slag (GGBFS) as mineral admixture were used to replace 25% Portland cement. The effect of MG, G on the fresh mortar behavior and properties of mortar containing different mineral admixtures were investigated, the results showed higher initial slump flow diameter values and better slump flow preservation. Higher mechanical properties of mortar were observed when natural river sand (R) was replaced by MG, G, while the presence of the MG, G in mortar enhanced drying shrinkage and alkali-silica reaction (ASR) expansion values. 相似文献
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干粉类聚合物水泥防水砂浆的研制 总被引:1,自引:0,他引:1
介绍了干粉类聚合物水泥防水砂浆性能特点及主要原材料,研究了不同聚灰比对防水砂浆压折比的影响,超细矿物粉与可分散胶粉的协同作用以提高砂浆抗渗性、耐久性及粘结性能的机理,级配砂与纤维对防水砂浆抗裂性及收缩率的影响. 相似文献
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用以石膏为细菌载体及以乳酸钙、尿素为底物的自修复剂,基于微生物诱导碳酸钙沉淀(MICP)技术实现了珊瑚砂砂浆裂缝的自修复,验证了石膏作为细菌载体修复珊瑚砂砂浆裂缝的可行性,探讨了自修复剂配比和养护方式对自修复效果的影响,分析了裂缝区生成物的矿物成分及形态.结果 表明:掺入石膏为细菌载体的自修复剂后,试样裂缝自修复效果良好;裂缝生成物主要是方解石和球霰石型碳酸钙;当含菌载体和底物掺量均为3.0%时,试样裂缝有较好的自修复效果,同时对珊瑚砂砂浆强度影响相对较小. 相似文献
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为更好研究机制砂的合理应用,选取了3种不同岩性的机制砂,通过分级筛分后调配成Ⅱ区中砂,设计了三种不同级配的机制砂。研究了不同机制砂的化学组成、矿物组成和微观形貌,以及不同机制砂对胶砂性能的影响。研究表明:不同机制砂颗粒的长径比和圆形度有一定的差异,个别粒级的参数差异较大;级配对钙基机制砂胶砂强度影响没有硅基机制砂显著;细度模数较大时,钙基机制砂胶砂强度大于硅基机制砂。 相似文献
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《Construction and Building Materials》2010,24(1):113-117
A powder obtained as a by-product of marble sawing and shaping was characterized from a chemical and physical point of view in order to use it as mineral addition for mortars and concretes, especially for self-compacting concrete. This marble powder showed a very high Blaine fineness value of about 1500 m2/kg, with 90% of particles finer than 50 μm and 50% under 7 μm. For rheological studies, several cement pastes were prepared using marble powder, with and without the addition of an acrylic-based superplasticizer. Water to cementitious materials ratio was also varied. In order to evaluate the effects of the marble powder on mechanical behaviour, many different mortar mixtures were tested, all prepared with sand to cement ratio of 3:1 at about the same workability. Mixtures were evaluated based upon cement or sand substitution by the marble powder. Results obtained show that 10% substitution of sand by the marble powder provided maximum compressive strength at about the same workability. 相似文献