C80高强泵送混凝土试验研究.pdf

全国中文核心期刊
新型十
中国科技核心期刊
c80高强泵送混凝士试验硏究
范庆新,姚志允1,简振锷1,林东2,王恒昌2
东工业大学,东州510
2.华南埋工大学,广东广州510640
摘要:采用正交试验,研究了水胶比、硅灰掺量、矿粉掺量对C80高强泵送混凝十强度和可泵件的影响。结果表明,对于C80混
凝十的28d强度,各因素的影响大小顺序为:硅灰掺量>矿粉掺量>水胶比:对于可泵性,倒坍落度筒时间试验表明,矿粉摻量的影
响非常显著,水胶比次之,硅灰掺量対倒坍落度筒吋间影响不显著。在正交试验的基础上,得到了C80高强泵送混凝土的最优配合
比:m(水泥)m(砂):m(石)m(硅粉):m(矿粉)m(减水剂):m(水)=450:739:1006:30:120:13.2:144。混凝土28d抗压强度为96MPa,达到
C80混凝土的设计要求:泥凝土初始坍洛度在200-220mm,2h内坍落度损失小丁20mm,新拌混凝土倒坍洛度筒时间低了10s,粘度
低,具有良好的可泵性
关键词:高强泵送混凝土:强度;可泵性
中图分类号:TU528,31
文献标识码:A文章编号:1001-702X(201707-0141-03
Experimental study on C80 high strength pumped concrete
FAN Qingxin YAO Zhiyun JIAN Zhene LIN Don, WANG Hengchang?
(1.Guangdong University of Technology, Guangzhou 510000, China
2. South China University of Technology, Guangzhou 510640, China)
Abstract: The effects of water-cement ratio, silicon content an la content n he strenth and pump ability of C80 high
strength pumped concrete are studied by orthogonal test The results of orthogonal test showed that the order of influencing factors
of 28 days strength of 80 concrete was silica fume content>slag content water cement ratio, for pump ability, the test of slum
time showed that the influence of slag dosage was very significant, the ratio of water-cement was the second, and the influence of
silica fume content on the slumping time was non-significant On the basis of orthogonal test, the optimum mix proportion of C0
high enth pumping concrete was obtained m(em man m( oe i ca um m(meal powder): m( water reducing
m(water)=450: 39: 1006: 30: 10: 13.2: 144. The test results show that the concrete strength is 96 Mpa in 28 d, reaches the design
requirements of 80 concrete Concrete initial lump is between 200-220 mm, and the slump loss is within 20 mm in 2 h, fresh
oncrete collapsed to fall cone time less than 10 s, with low viscosity, good pump ability
Key words: high strength pumped concrete, strength, pump ability
目前混凝上施工大多采用泵送技术,具有施工便捷,浇灌
范围人,工效高,适应性较强等优点。随着现代建筑业的发展,1试验
高强混凝土的应川也越米越广泛。但高强混凝土在泵送过程1.1原材料
中,随着混凝上强度的提高,混凝士的粘度增大,泵送阻
水泥:珠江水泥有限公司公司生产的P?⊥42.5水泥,实
力增加,泵送难度急剧上升?。因此,研究高强混凝土的泵送特测3d、28d抗压强度分别为36.3MPa、57.5MPa,3d、28d抗
性,改善其可泵性,对于高强混凝土的推广应用具有重要意折强度分别为7,4MPa、10.3MPa,均符合GB175-2007《通
用硅酸盐水泥》的要求。
砂:西江河砂,细度模数为2.7,Ⅱ区中砂,含泥量0.9%
收稿日期:2017-03-06;修订日期:2017-03-25
泥块含量0.1%,表观密度2640kgim
作者简介:范庆新,女,1967年生,广东梅州人,副教授。地止:'州市
石:惠州生产的反击破碎石,粒径5-20m,实测级配合
大学城外环西路100号,E-mail:fanqingxinc126.com
格,针片状颗粒含量1.8%,压碎指标5.2%,含泥量0.2%,泥块
NEW BUILDING MATERALS
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万方数括