Ⅲ级粉煤灰与水泥浆体的微界面改性
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长江科学院开放研究基金资助项目(CKWV2019757/KY);国家自然科学基金资助项目(51778003);江苏省建设系统科技项目(2017ZD23);陕西省高性能混凝土工程实验室开放基金资助项目(SHPC201705)


Modification of Micro interface between Grade Ⅲ Fly Ash and Cement Paste
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    摘要:

    采用电石渣对Ⅲ级粉煤灰进行高温煅烧改性,利用X射线衍射(XRD)、扫描电子显微镜(SEM)和纳米划痕仪对改性Ⅲ级粉煤灰的矿物组成和表面形貌进行表征,研究了改性Ⅲ级粉煤灰的水化性能,对比分析了未改性和改性Ⅲ级粉煤灰与水泥浆体的微界面形貌和力学性能.结果表明:改性Ⅲ级粉煤灰表面生成了水化活性较好的βC2S,其水化生成的CSH凝胶改善了Ⅲ级粉煤灰颗粒与水泥浆体的微界面,减少了微界面区的孔隙,提高了微界面的力学性能.

    Abstract:

    The surface of grade Ⅲ fly ash was modified through calcination method by mixing carbide slag. The mineral composition and surface morphology of the modified grade Ⅲ fly ash were characterized by using X ray diffraction(XRD), scanning electron microscopy(SEM) and nan scratch technique, and the hydration property of the modified grade Ⅲ fly ash was analyzed. The morphology and mechanical properties of micro interface between unmodified or modified grade Ⅲ fly ash were compared. The results show that the β C2S phase is formed on the surface of the modified grade Ⅲ fly ash, hydration of the modified grade Ⅲ fly ash will generate C S H gel which improves the micro interface microstructure between grade Ⅲ fly ash and cement paste, the porosity of micro interface of blended cement paste is decreased, and the mechanical properties of micro interface of blended cement paste is improved.

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陈登,高世明,张钰晖,王爱国,何智海.Ⅲ级粉煤灰与水泥浆体的微界面改性[J].建筑材料学报,2020,23(2):447-453

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  • 收稿日期:2018-11-12
  • 最后修改日期:2019-01-10
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  • 在线发布日期: 2020-05-11
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