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Relationship Between Coarse/Fine Aggregate Space Coefficient and Properties of Self-compacting Concrete

武汉理工大学学报 2010年第17期32卷 158-164,169页

作者： LONG G C LIU Y H XIE Y J School of Civil engineering and Architecture Central South UniversityChangsha 410075China quality intendance and inspect station of construction engineering Chenzhou 423000China

For the sake of expounding the relationship between coarse/fine aggregate volume content and properties of self-compacting concrete(SCC),a parameter of aggregate space coefficient is proposed to study systematically the effects of fine/ coarse aggregates on workability,strength and volume stability of SCC by experiments. The optimized coarse/fine aggregates volume content of SCC was discussed with regard to specified properties. Results indicate there is a close relationship between aggregate space coefficient and properties of SCC not only in fresh state but also in hardened state. With the increasing coarse/fine aggregate space coefficients,workability of fresh SCC will be improved,the compressive strength decreases slightly and shrinkage of SCC however increases. When coarse aggregate space coefficient ranges from 1.2 to 1.7 and the fine aggregate space coefficients is from 0.6 to 1.0,SCC can meet self-compactability requirements in fresh state and have a good volume stability and appropriate strength in hardened state. The results will benefits for developing a new mixing design method for SCC.

关键词： self-compacting concrete aggregate space coefficient workability compressive strength shrinkage

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土体冻胀量计算方法研究（英文）

土体冻胀量计算方法研究（英文）

引用

The Fourth International Symposium on Permafrost engineering

作者：宋玲周池绪陈建新李斌 Dept.of Civil engineering Shihezi University station of quality inspect the Railway Company of North Xinjiang

Considerable studies have been done on the damage to the construction acted by the frost-upheaval *** was known that soil frost-upheaval was relative to the composing of the grain size and the salinity,the load and the liner *** to the data collected in the experiment,many formulae were ***,the formulae were relevant to the water table or a certain special factor under the environment,they had regionalism more or *** the exact capacity of soil frost-upheaval under construction couldn t be achieved,the analysis of the frost-upheaval force acted normal to the construction couldn t be carried out,*** on the previous achievements,from the angle of energy,with the knowledge of conduct mechanics,the capacity of froze-upheaval was more accurately calculated in the paper by modern *** only the soil frost-upheaval but also the classification to the character of frost-upheaval was mainly depended on the composing of the grain *** for a certain kind of soil,the dimension of frost-upheaval had concern with its frozen depth（namely the least distance from the temperature isotherm of being frozen up to the surface）,which was the result interacting of those factors such as the temperatures of soil and air,the salinity in the soil,the load,the liner and so *** the thinking above,the calculation of the dimension of frost-upheaval could be divided into two steps:1)determining the character of frost-upheaval,2)calculating the frozen depth in the real *** the capacity of frost-upheaval in winter could be worked out more *** analysis and calculation on the construction acted by the frozen force could be worked out,*** researches provided the basic theory about the anti-freezing design of building.

关键词： capacity of frost-upheaval frost-upheaval frozen depth calculating method

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