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. |
关键词: 改性Ⅲ级粉煤灰 水化 微界面 力学性能 |
DOI:103969/j.issn1007 9629202002030 |
分类号: |
基金项目: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) |
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Modification of Micro interface between Grade Ⅲ Fly Ash and Cement Paste |
CHEN Deng1, GAO Shiming1, ZHANG Yuhui1, WANG Aiguo2, HE Zhihai3
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1.School of Civil Engineering, Suzhou University of Science and Technology, Suzhou 215011, China;2.Anhui Key Laboratory of Advanced Building Materials, Anhui Jianzhu University, Hefei 230022, China;3.College of Civil Engineering, Shaoxing University, Shaoxing 312000, China
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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. |
Key words: modified grade Ⅲ fly ash hydration micro interface mechanical property |