高性能填充轻集料混凝土试验研究

发布时间：2018-06-16 17:23

本文选题：轻集料混凝土 + 填充混凝土　；参考：《北京工业大学学报》2017年06期

【摘要】：为了解决钢管混凝土结构高性能填充材料的制备问题,选用高强水泥、粉煤灰、硅灰、膨胀剂、页岩陶粒、页岩陶砂与天然砂组成的混合细集料、高效减水剂和增稠剂制备出具有轻质、微膨胀和自密实性能的高强混凝土,设计18个试验组对比分析了混合细集料中天然砂体积分数、胶凝材料用量和体积砂率对混凝土工作性能、物理力学性能和硬化变形性能的影响规律.研究结果表明:选用上述原材料,采用内掺法和松散体积法进行掺合料和混合细集料用量设计,调整混合细集料中天然砂和陶砂的体积比来改良颗粒级配,每m3混凝土掺入540~570 kg胶凝材料,体积砂率取值47%左右,可制备出适用于钢管轻集料混凝土结构的高性能填充轻集料混凝土.
[Abstract]:In order to solve the problem of preparation of high performance filling material for concrete filled steel tube structure, high strength cement, fly ash, silica fume, expansive agent, shale ceramsite, shale pottery sand and natural sand are selected as fine aggregate. High-strength concrete with light-weight, micro-expansion and self-compacting properties was prepared by high efficiency water reducer and thickener. The volume fraction of natural sand in mixed fine aggregate was compared and analyzed in 18 test groups. The effects of cement content and volume sand ratio on the working properties, physical and mechanical properties and hardening and deformation properties of concrete. The results show that the volume ratio of natural sand and pottery sand in the mixed fine aggregate is adjusted to improve the particle gradation by adopting the above mentioned raw materials and adopting the method of inner admixture and loose volume to design the dosage of admixture and mixed fine aggregate. High performance filled lightweight aggregate concrete suitable for light aggregate concrete structure of steel tube can be prepared by adding 540 ~ 570kg cementitious material per m ~ 3 concrete and taking about 47% of volume sand ratio.
【作者单位】：北京工业大学北京城市交通协同创新中心;中铁十六局集团有限公司;
【基金】：国家自然科学基金资助项目(51538001) 北京市自然科学基金资助项目(8161001) 北京市朝阳区协同创新资助项目(XC1402)
【分类号】：TU528.2

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