粗骨料对自密实混凝土流变性能影响的研究-《混凝土与水泥制品》杂志社

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粗骨料对自密实混凝土流变性能影响的研究

Study of Effects of Coarse Aggregate on Rheological Properties for Self-compacting Concrete

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关键词：

自密实混凝土；粗骨料间距系数；坍落扩展度；V型漏斗流出时间

Key words：

Self-compacting concrete; Coarse aggregate-space coefficient; Slump flow; V-funnel flow time

刊期：

２０17年第3期

DOI：

文章编号：

1000-4637（2017）03-05-04

基金项目：

北京市自然科学基金重大项目（8100001）

作者：

蒋玉川，王阳，许金娥

单位：

中国建材检验认证集团股份有限公司，中国建筑材料科学研究总院，北京 100024

摘要

摘要：研究了粗骨料间距系数对自密实混凝土流变性能的影响。试验结果表明，在粗骨料最大粒径为16mm、砂子与砂浆体积比为0.43、水胶比为0.38情况下，粗骨料间距系数对自密实混凝土拌合物坍落扩展度和V型漏斗流出时间有显著影响。粗骨料间距系数越大，坍落扩展度越大，V型漏斗流出时间越小。本文试验条件下，自密实混凝土粗骨料间距系数取值范围为1.31～1.58较为合适，既可以保证拌合物具有优良的流变性能，又可以保证混凝土的稳定性。本文试验中，粗骨料间距系数对抗压强度影响不大。

Abstract: The influence of coarse aggregate-space coefficient on the rheological performance of self-compacting concrete (SCC) is studied. The results indicate that coarse aggregate-space coefficient has significant influence on slump flow and V-funnel flow time of SCC, when the maximum aggregate particle size is 16mm and the volume ratio of sand and motor is 0.43, meanwhile water binder ratio is 0.38. The higher coarse aggregate-space coefficient, the lager slump flow and the shorter V-funnel flow time. The range of coarse aggregate-space coefficient of SCC is suitable for 1.31～1.58 under the condition of the paper. The suitable range can guarantee excellent rheological performance and stability of SCC mixture. There is little effect of coarse aggregate-space coefficient on compressive strength in this paper tests.

结论

（1）粗骨料间距系数在1.16～2.11之间时，与在混凝土中的体积含量存在较好的线性关系，线性相关系数达到0.9725。

（2）在粗骨料最大粒径16mm、砂子与砂浆体积比为0.43、水胶比为0.38情况下，自密实混凝土拌合物坍落扩展度随着粗骨料间距系数的增加而增大，V型漏斗流出时间随着粗骨料间距系数的增加而减小。粗骨料间距系数在1.16～1.58之间变化时，坍落扩展度和V型漏斗流出时间有显著变化；间距系数在1.58～2.11之间时，对坍落扩展度和V型漏斗流出时间的影响较小。

（3）本文试验条件下，自密实混凝土粗骨料间距系数在1.31～1.58之间较为合适，并且优先选取较大值，既可以保证拌合物具有优良的流变性能，又可以保证混凝土中有足够量的粗骨料起到骨架作用以保持混凝土的稳定性。

（4）本文试验条件下，粗骨料间距系数在1.16～2.11之间时，自密实混凝土的抗压强度基本保持不变，最大偏差为7.1%。

参考文献

[1] RSoussel N, Lemaitre A, Flatt RJ, et al. Steady state flow of cement suspensions: A micromechanical state of the art[J]. Cement and Concrete Research, 2010, 40(1):77-84.

[2] Murata J. Flow and deformation of fresh concrete[J]. Materiaux et Construction,1984,17(2): 117-129.

[3] Saak A W, Jennings H M, Shah S P. A generalized approach for the determination of yield stress by slump and slump flow[J]. Cem Concr Res, 2004, 34(3): 363-371.

[4] Roussel N. The LCPC BOX: a cheap and simple technique for yield stress measurements of SCC[J]. Materials and Structures, 2007, 40(9): 889-896.

[5] Hans W R, Wustholz T. About the influence of the content and composition of the aggregates on the rheological behaviour of self-compacting concrete[J]. Materials and Structures, 2006, 39:683-693.

[6] Brouwers H J H, Radix H J. Self-compacting concrete: Theoretical and experimental study[J]. Cement and Concrete Research, 2005, 35: 2116-2136.

[7] Bonen D, Shah Surendra P. Fresh and hardened properties of self-compacting concrete[J]. Progress Structure Engineering Material, 2005(7): 14-26.

[8] Yammine J, Chaouche M, Guerinet M, et al. From ordinary rhelogy concrete to self-compacting concrete: A transition between frictional and hydrodynamic interactions[J]. Cement and Concrete Research, 2008, 38: 890-896.

[9] Goltermann P, Johansen V, Palbol L. Packing of aggregates: an alternative tool to determine the optimal aggregate mix[J]. ACI Mater J, 1997, 94(5): 435-443.

[10] 徐定华,冯文元.混凝土材料实用指南[M].北京:中国建材工业出版社,2005.

[11] Funk J E, Dinger D R. Predictive Process Control of Crowded Particulate Suspensions[M]. Applied to Ceramic Manufacturing. Boston: Kluwer Academic Press, 1994.

[12] De Larrard F. Concrete mixture proportioning: a scientific approach[M].London: E and FN Spon, 1999.

[13] ]Roussel N. A theoretical frame to study stability of fresh concrete. Materials and Structures, 2006, 39: 81-91.

[14] De Larrard F, Sedran T. Mixture-proportioning of high-performance concrete[J]. Cement and Concrete Research, 2002, 32(11): 1699-1704.

[15] Long G C, Liu Y H, Xie Y J. Relationship between coarse/fine aggregate space coefficient and properties of self-compacting concrete[J]. 武汉理工大学学报,2010,32(17):158-164.

引用本文

蒋玉川,王阳,许金娥.粗骨料对自密实混凝土流变性能影响的研究[J].混凝土与水泥制品,2017(3):5-8.

JIANG Y C, WANG Y, XU J E.Study of Effects of Coarse Aggregate on Rheological Properties for Self-compacting Concrete[J].China Concrete and Cement Products,2017(3):5-8.

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