共查询到19条相似文献,搜索用时 218 毫秒
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粉煤灰对混凝土补偿收缩性能的影响 总被引:7,自引:2,他引:5
本文阐述了粉煤灰对普通混凝土和补偿收缩混凝土的收缩膨胀性能的不同影响。指出掺加优质粉煤灰可使混凝土减少用水量,降低收缩值;但却使补偿收缩混凝土的膨胀量降低,原因是粉煤灰的火山灰效应会对水化产物钙矾石的形貌和性能产生影响。 相似文献
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在低热矿渣硅酸盐水泥生产过程中,掺加一定含量的方镁石,能够使水泥本身具有缓慢的微膨胀性能,有效补偿大体积混凝土的收缩裂缝。 相似文献
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在低热矿渣硅酸盐水泥生产过程中,掺加一定含量的方镁石,能够使水泥本身具有缓慢的微膨胀性能,有效补偿大体积混凝土的收缩裂缝. 相似文献
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叶青 《混凝土与水泥制品》1999,(5):15-17
本文将膨胀型超细矿粉引入高强混凝土,意在补偿其自缩,冷缩,干缩和内收缩,提高其耐久性,使高强混凝土真正成为高性能混凝土。本文借助水泥与混凝土胀缩和强度试验以及X射线衍射物相分析,研究了掺超细矿粉和掺膨胀型超细矿粉高强混凝土及其水泥石的体积稳定性。 相似文献
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掺加混合材的水泥石自收缩特性研究 总被引:13,自引:2,他引:11
研究了不同种类的混合材对水泥石自收缩的影响,并试图通过复合粉煤灰或石灰石粉来降低掺加超细矿渣的水泥石自收缩;应用了交流阻抗谱技术来研究自收缩现象,研制结果表明,水泥石自收缩会随超细矿渣细度的增加而增加;掺加硅灰会增大水泥石的自收缩;石灰石和粉煤灰能够有效地降低自收缩;大量掺加石灰石粉或粉煤灰能够降低复合了超细矿渣的水泥石自收缩;水泥石的交流阻抗值与自收缩率之间有良好的对应关系,自收缩率增加,阻抗值增大。 相似文献
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大掺量矿渣微粉与粉煤灰在大体积混凝土中的应用 总被引:7,自引:0,他引:7
介绍了大掺量矿渣微粉和粉煤灰混凝土在浮山所大体积底板工程的浇筑。利用矿渣微粉和粉煤灰的微集料效应和火山灰效应.解决了大体积混凝土的水化热和收缩问题,并取得了较好的经济和社会效益。 相似文献
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李晖 《膨胀剂与膨胀混凝土》2006,(4)
通过对掺加膨胀剂和聚丙烯纤维配制的补偿收缩纤维混凝土性能的研究、讨论和工程应用,表明补偿收缩纤维混凝土能有效地控制混凝土结构早期塑性收缩、干缩和温度应力引起的裂缝,提高结构的抗裂防水能力和耐久性。 相似文献
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补偿收缩混凝土在设计及施工中的应用 总被引:1,自引:1,他引:0
从补偿收缩混凝土的基本性能、其对干缩及冷缩的联合补偿作用、无缝设计的理论依据三方面,介绍了补偿收缩混凝土的设计和理论依据,对于大体积混凝土的无缝设计与施工具有重要意义。 相似文献
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Khalifa S. Al-Jabri Makoto Hisada Abdullah H. Al-Saidy S.K. Al-Oraimi 《Construction and Building Materials》2009,23(6):2132-2140
This research study was conducted to investigate the performance of high strength concrete (HSC) made with copper slag as a fine aggregate at constant workability and to study the effect of superplasticizer addition on the properties of HSC made with copper slag. Two series of concrete mixtures were prepared with different proportions of copper slag. The first series consisted of six concrete mixtures prepared with different proportions of copper slag at constant workability. The water content was adjusted in each mixture in order to achieve the same workability as that for the control mixture. Twelve concrete mixtures were prepared in the second series. Only the first mixture was prepared using superplasticizer whereas the other eleven mixtures were prepared without using superplasticizer and with different proportions of copper slag used as sand replacement. The results indicated that the water demand reduced by almost 22% at 100% copper slag replacement compared to the control mixture. The strength and durability of HSC were generally improved with the increase of copper slag content in the concrete mixture. However, the strength and durability characteristics of HSC were adversely affected by the absence of the superplasticizer from the concrete paste despite the improvement in the concrete strength with the increase of copper content. All concrete mixtures did not meet the strength and durability design requirements due to the segregation and dryness of the concrete paste. Therefore it can be concluded that the use of copper slag as sand substitution improves HSC strength and durability characteristics at same workability while superplasticizer is very important ingredient in HSC made with copper slag in order to provide good workability and better consistency for the concrete matrix. 相似文献
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优异的混凝土膨胀剂(TEA) 总被引:2,自引:0,他引:2
依据与水泥生成超细粒致密系统浆体理论,利用天然非金属硅酸盐矿物与水泥形成不透水凝胶体的特有膨胀性能,研制出高抗渗、抗收缩的TEA-膨胀型防水剂。它具有14d水养的关期微膨胀和14d后(空气中)混凝土收缩期(286d)的延迟微膨胀,因而不仅适用于水工、建筑用补偿收缩混凝土,也适用于钢管混凝土。 相似文献
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首都国际机场停车楼高性能混凝土施工技术 总被引:3,自引:0,他引:3
首都国际机场车楼工程中,采用C50及C60以上高性能混凝土,为最大限度减少水泥用量,降低水化热,减少收缩与裂缝,提高混凝土的性能,优选了有效成分含量高、质量好的水淬高炉矿渣磨细后单独掺用, 相似文献