Effects of water/cement ratio on early age hydration phases composition and strength development of concrete in thermal environment

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Title: Effects of water/cement ratio on early age hydration phases composition and strength development of concrete in thermal environment

Author(s): Fengchen Zhang, Lingling Ai and Dejian Shen

Publication: China Concrete and Cement Products

Volume:

Issue: No.5 2010(Total 175)

Appears on pages(s): 7-10

Keywords: Thermal environment, Water to cement ratio, Early age, Strength development, Hydration phases composition

Date: 10/20/2010

Abstract:
Cement hydration at early age is in a certain temperature field because of hydration heat of mass concrete as well as ce-ment productions curing with high temperature.Therefore phases composition and strength development in thermal environment are com-monly different from those in normal curing conditions.Phases composition and strength development at early age of concrete with differ-ent water to cement ratio(w/c) cured in different thermal environment are studied,and the brittleness is evaluated by means of tensile-splitting strength to compressive strength ratio.Experimental results show that compressive strength of concrete with different w/c are im-proved with the increase of curing temperature.Tensile-splitting strength increases most at 50℃ and decreases when the curing tempera-ture continued to increase.Moreover,tensile-splitting strength of concrete with lower w/c decreases obviously.In lower temperature envi-ronment,the w/c has little effects on phases composition,while in higher temperature environment,phases composition varies with the w/ c.
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