两阶段变速搅拌对高强混凝土稳定性的影响

材料导报

2019, Vol. 33

Issue (z1): 229-233

无机非金属及其复合材料

两阶段变速搅拌对高强混凝土稳定性的影响

胡建伟¹, 谢永江^1,2, 刘子科^1,2, 翁智财^1,2, 王月华^1,2, 何龙^1,2

1 中国铁道科学研究院,北京 100081
2 高速铁路轨道技术国家重点实验室,北京 100081

The Effect of Two-stage Variable-speed Mixing on the Stability of High-strength Concrete

HU Jianwei¹, XIE Yongjiang^1,2, LIU Zike^1,2, WENG Zhicai^1,2, WANG Yuehua^1,2, HE Long^1,2

1 China Academy of Railway Science, Beijing 100081
2 State Key Laboratory for Track Technology of High-speed Railway, Beijing 100081

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摘要采用不同搅拌工艺制备高强混凝土并进行混凝土稳定性试验,研究搅拌工艺对混凝土气泡结构参数、密度、抗压强度和显微硬度的影响规律。结果表明:两阶段变速搅拌工艺可以较好地改善混凝土拌合物的气泡结构,直径不超过500 μm的气泡含量明显提高;两阶段变速搅拌工艺显著降低了混凝土上、下层密度差,对混凝土抗压强度改善不明显,但显著降低了抗压强度离散系数;两阶段变速搅拌可降低混凝土分层趋势,显微硬度差值梯度降低,提高了混凝土的稳定性。

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关键词: 搅拌工艺高强混凝土稳定性气泡结构参数抗压强度显微硬度

Abstract: The high-strength concrete was prepared by different mixing approaches and the concrete stability test was carried out. The influence of mi-xing approach on the bubble structural parameters, density, compressive strength and microhardness of concrete was studied. The results show that two-stage variable-speed mixing approach can better improve the bubble structure of fresh concrete. The bubble content increases obviously, which is less than 500 μm. The two-stage variable-speed mixing approach reduces the density difference between the upper and lower layers of concrete significantly. The improvement of compressive strength of concrete is not obvious, but the compressive strength dispersion coefficient is significantly reduced. The two-stage variable-speed mixing approach can reduce the stratification trend of concrete, reduce the microhardness difference gradient, and improve the stability of concrete

Key words: mixing approach high-strength concrete stability bubble structural parameters compressive strength microhardness

出版日期: 2019-05-25 发布日期: 2019-07-05

ZTFLH:

TU528

基金资助: 国家重点研发计划(2017YFB0310000);中国铁道科学研究院基金项目(2017YJ043)

作者简介: 胡建伟,1988年9月生,中国铁道科学研究院桥梁与隧道工程专业博士生,主要从事水泥混凝土制品工艺、早强纳米材料的合成与应用等方面的工作。参与国家重点研发计划、铁路总公司科技项目以及中国铁道科学研究院基金项目等5项。谢永江,1964年6月生,建筑材料学硕士,研究员,博士研究生导师。现任中国铁道科学研究院集团有限公司工程材料事业部主任,铁路工程材料领域学术带头人。长期从事铁路工程材料、混凝土制品以及混凝土施工技术研究工作。主持和参加完成国家863、973、国家自然科学基金、科技部、铁道部以及铁路总公司科技攻关项目等54项,获国家科技特等奖1项、省部级奖16项,获授权国家专利40项,发表学术论文102篇,主编和参编国家及行业标准27项。xieyj2004@sina.com

引用本文:

胡建伟, 谢永江, 刘子科, 翁智财, 王月华, 何龙. 两阶段变速搅拌对高强混凝土稳定性的影响[J]. 材料导报, 2019, 33(z1): 229-233.
HU Jianwei, XIE Yongjiang, LIU Zike, WENG Zhicai, WANG Yuehua, HE Long. The Effect of Two-stage Variable-speed Mixing on the Stability of High-strength Concrete. Materials Reports, 2019, 33(z1): 229-233.

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