纳米CaCO3对粉煤灰再生骨料混凝土性能及微结构的影响
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武汉工程大学

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TU528???????????????????????????

基金项目:

湖北省重点研发计划(2020BAB071);武汉工程大学研究生创新基金资助项目(CX2021121)


Effect of Nano CaCO3 on Properties and Microstructure of Fly Ash Recycled Aggregate Concrete
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Wuhan Institute of Technology

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Key research and development plan of Hubei Province(2020BAB071);Project supported by graduate innovation fund of Wuhan Institute of Technology(CX2021121)

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    摘要:

    研究了纳米CaCO3(NC)和粉煤灰(FA)单掺、复掺对再生骨料混凝土坍落度、强度、水化反应特性和微观结构的影响.结果表明:复掺FA能够减小掺入NC引起的坍落度负面影响;复掺NC可以弥补FA掺入导致再生骨料混凝土早期强度降低的缺点;单掺NC的再生骨料混凝土90 d抗压强度增幅降低,两者复掺后,再生骨料混凝土90 d的抗压强度得到提升.随着NC和FA的掺入,再生骨料混凝土氢氧化钙(CH)晶体含量明显降低;NC能够提高水泥的水化反应速率,细化水化产物,修复老砂浆和新砂浆之间的界面过渡区(ITZ),提高再生骨料混凝土微观结构的密实度.

    Abstract:

    The effects of nano CaCO3 (NC) and fly ash (FA) on the slump, strength, hydration reaction characteristics and microstructure of recycled aggregate concrete were studied. The results show that the negative effect of slump caused by adding NC can be reduced by adding FA; The addition of NC can make up for the decrease of early strength of recycled aggregate concrete caused by the addition of FA; The increase of 90 d compressive strength of recycled aggregate concrete mixed with NC is reduced, and the 90 d compressive strength of recycled aggregate concrete is improved after they are mixed together. With the addition of NC and FA, the content of calcium hydroxide (CH) crystal in recycled aggregate concrete decreases significantly; NC can improve the hydration reaction rate of cement, refine hydration products, repair the interface transition zone (ITZ) between old mortar and new mortar, and improve the compactness of microstructure of recycled aggregate concrete.

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  • 收稿日期:2022-03-07
  • 最后修改日期:2022-05-04
  • 录用日期:2022-05-05
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