免振捣轻骨料混凝土工作性能研究

发布时间：2018-02-28 00:30

本文关键词： 免振捣轻骨料混凝土工作性能　出处：《混凝土》2017年02期 　论文类型：期刊论文

【摘要】：研究了粉煤灰含量、硅灰含量、矿粉含量对免振捣轻骨料混凝土工作性能的影响,单掺试验表明,在粉煤灰含量小于25%时,填充高度增加的幅度最大;在硅灰含量为9%时,抗压强度最大,60 min的混凝土坍落度降低幅度最大;在矿粉含量为24%时,坍落度、扩展度和填充高度均出现最大值,分层度则随着矿粉含量的增加一直呈下降趋势;在硅灰含量为16%时,混凝土抗压强度最大。混掺试验结果表明,采用粉煤灰、硅灰、矿粉混掺合配合比的轻骨料混凝土5个试件的坍落度、扩展度、填充高度、流动性均比单掺矿物掺合料要好,坍落度达到240 mm以上,填充高度达到310 mm以上,扩展度达580 mm以上,流动性达到130 mm以上,分层度均在9.6%以下,抗压强度38.0 MPa以上,完全满足免振捣泵送的技术要求。
[Abstract]:The effects of fly ash content, silica fume content and mineral powder content on the working performance of vibration-free lightweight aggregate concrete are studied. The results of single mixing test show that when the fly ash content is less than 25, the filling height increases the most, and when the silica fume content is 9, the filling height increases the most when the fly ash content is less than 25 and when the silica fume content is 9. When the content of mineral powder is 24, the slump, extension and filling height of concrete with maximum compressive strength of 60 min are the maximum, while the stratification degree is decreasing with the increase of mineral powder content. When the content of silica fume is 16, the compressive strength of concrete is the greatest. The results of mixing test show that the slump, expansion and filling height of lightweight aggregate concrete with mixing ratio of fly ash, silica fume and mineral powder are 5. The fluidity is better than that of single mineral admixture, the slump is more than 240mm, the filling height is more than 310mm, the expansion is more than 580mm, the fluidity is more than 130mm, the stratification degree is below 9.6%, and the compressive strength is more than 38.0 MPa. Fully meet the technical requirements of vibration-free tamping pump.
【作者单位】：重庆能源职业学院;
【分类号】：TU528.2

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