泡沫流态粉煤灰的配合比设计与性能研究

发布时间：2018-02-28 02:41

本文关键词： 公路工程建筑材料性能试验泡沫流态粉煤灰配合比设计强度　出处：《广西大学学报(自然科学版)》2017年01期 　论文类型：期刊论文

【摘要】：为解决软土地基上修建高速公路时常出现的较大沉降及路桥衔接处差异沉降引起的桥头跳车等工程问题,同时着重考虑节能环保,达到节约建筑材料的目的,提出并设计了泡沫流态粉煤灰这一新型轻质建筑材料。通过系统的试验,在材料配合比初步设计的基础上,分析了泡沫流态粉煤灰的密度、抗压强度、水稳定性、冻融稳定性等技术性能,以及配合比对材料各项技术指标的影响规律,提出了三种推荐采用的泡沫流态粉煤灰配合比。试验结果表明:发泡剂、水泥的掺入量、含水量均对泡沫流态粉煤灰的技术性能具有显著影响;当发泡剂含量从0增加到含水量的1/30时,泡沫流态粉煤灰的干密度、7 d龄期抗压强度、水稳定系数和冻融稳定系数(BDR)分别降低了23%、50%、10%~15%和20%左右;当水泥含量8%提高至20%时,7 d龄期抗压强度、水稳定系数和冻融稳定系数(BDR)分别提高了58.1%、38.2%和20.9%;当含水量从40%提高至60%时,干密度降低了约25%,推荐配合比的泡沫流态粉煤灰干密度比普通土低40%以上。表明泡沫流态粉煤灰是一种良好的轻质建筑材料。
[Abstract]:In order to solve the engineering problems such as the large settlement often occurring in the expressway construction on soft soil foundation and the bridge head jump caused by the differential settlement at the junction of road and bridge, the energy saving and environmental protection are emphatically considered, and the purpose of saving the building materials is achieved. A new type of lightweight building material, foamed fly ash, is proposed and designed. The density, compressive strength and water stability of foamed fly ash are analyzed on the basis of the preliminary design of material mix ratio. The technical properties, such as freeze-thaw stability, and the influence of mixing ratio on the technical indexes of materials, are proposed. The results show that the foaming agent and cement are mixed with three kinds of recommended foamed fly ash. When the content of foaming agent increased from 0 to 1/30 of water content, the dry density and compressive strength of foamed fly ash at 7 d age were significantly affected by water content. The water stability coefficient and freeze-thaw stability factor (BDRR) were reduced by 23% and 50%, respectively. When the cement content increased from 8% to 20, the water stability coefficient and freeze-thaw stability factor increased by 58.2% and 20.90.When the cement content increased from 40% to 60th, the water stability coefficient and freeze-thaw stability coefficient increased by 58.2% and 20.9respectively. When the cement content increased from 8% to 20, the water stability coefficient and freeze-thaw stability coefficient increased by 58.2% and 20.90.When the cement content increased from 40% to 60th, The dry density of foamed fly ash is reduced by about 25%, and the dry density of foamed fly ash is lower than that of ordinary soil by more than 40%, which indicates that foamed fly ash is a good lightweight building material.
【作者单位】：河北工业大学土木与交通学院;天津市市政工程设计研究院;
【基金】：国家自然科学基金资助项目(50878073) 天津市市政公路局科技计划项目(2013-06)
【分类号】：U414

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