【摘 要】
：
The influence of a new type of antifreeze-reinforced material (AFRM) on Vc value, strength, freeze-thaw resistance, water absorptivity and void parameters of roller compacted concrete (RCC) were inves
【机 构】
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State Key Laboratory of Water Resources & Hydropower Engineering Science, Wuhan University,Wuhan 430
【出 处】
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The 14th International Congress on the Chemistry of Cement (
论文部分内容阅读
The influence of a new type of antifreeze-reinforced material (AFRM) on Vc value, strength, freeze-thaw resistance, water absorptivity and void parameters of roller compacted concrete (RCC) were investigated.Results showed, when the AFRM was incorporated into RCC, the VC value was not affected while the mechanical properties of RCC were greatly improved.In comparison to the reference concrete without incorporation of AFRM, the compressive strengths of RCC were increased by 16.7% and 28.3% respectively with incorporation of AFRM of 0.3% or 0.6%, while increased by 29.7% and 43.8% compared to air-entrained concrete of 5% air content.The mixtures incorporated AFRM showed less scaling and higher relative dynamic modulus than the control mixture and the air-entrained mixtures after exposure to the same cycles.The rate and coefficient of water absorption in RCC incorporated with AFRM were lowest among all RCC specimens, which confirmed that the structure of capillary pores of RCC was ameliorated by incorporation of AFRM.The air void parameters were determined, which proved that a great number of small, spherical and closely-spaced micro pores were introduced into the hardened RCC by incorporation of AFRM.The average pore radius was approximately 230μm and spacing factor varied with AFRM content, ranging from 199.22μm to 164.26μm,which interpreted why the RCC with incorporation of AFRM showed better freeze-thaw resistance.Therefore,AFRM can be considered as a new functional component to improve RCC performance in high altitude and severely cold area.
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