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改性Ⅲ级粉煤灰对混凝土强度和自收缩的影响
Influence of Modified Grade Ⅲ Fly Ash on Strength and Autogenous Shrinkage of Concrete
２０19年第11期
改性Ⅲ级粉煤灰；混凝土；强度；自收缩；微界面
Modified grade Ⅲ fly ash; Concrete; Strength; Autogenous shrinkage; Micro-interface
２０19年第11期
10.19761/j.1000-4637.2019.11.017.04
国家自然科学基金项目（51778003）；陕西省高性能混凝土工程实验室开放基金资助项目（SHPC201705）；江苏省建设系统科技项目（2017ZD23）；苏州市建筑节能科技支撑项目（苏住建科[2019]4号）。
陈 登1,2，张钰晖2，高世明2，宋旭艳2
1.陕西省高性能混凝土工程实验室，渭南714000；2.苏州科技大学土木工程学院，215011

陈 登1,2，张钰晖2，高世明2，宋旭艳2

陈登,张钰晖,高世明,等.改性Ⅲ级粉煤灰对混凝土强度和自收缩的影响[J].混凝土与水泥制品,2019(11):17-20.

CHEN D,ZHANG Y H,GAO S M,et al.Influence of Modified Grade Ⅲ Fly Ash on Strength and Autogenous Shrinkage of Concrete[J].China Concrete and Cement Products,2019(11):17-20.

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摘 要：采用电石渣对Ⅲ级粉煤灰进行增钙煅烧改性，利用XRD对改性Ⅲ级粉煤灰的矿物组成进行分析，测定了掺入改性Ⅲ级粉煤灰的C30混凝土的抗压强度和自收缩，并采用BSEM和纳米压痕仪分析了改性Ⅲ级粉煤灰与水泥浆体的微界面结构及微界面力学性能。结果表明：Ⅲ级粉煤灰经增钙煅烧改性后生成了水硬性矿物β-C2S，水化可生成C-S-H凝胶，改善了Ⅲ级粉煤灰颗粒与水泥浆体的微界面区结构，提高了微界面区的弹性模量和硬度，从而提高了掺Ⅲ级粉煤灰混凝土的强度，并降低了其自收缩。 Abstract: The grade Ⅲ fly ash was modified through calcination method by mixing carbide slag, the mineral compositions of the modified grade Ⅲ fly ash were characterized by XRD. The effects of modified grade Ⅲ fly ash on compressive strength and autogenous shrinkage of C30 concrete were investigated. The microstructure and mechanical properties of micro-interface between modified grade Ⅲ fly ash and cement paste were analyzed by using backscattered electron microscopy (BSEM) and nanoindentation technique. The results show that the β-C2S phases are formed after the grade Ⅲ fly ash was modified. Due to the hydration of the β-C2S, C-S-H gel is generated, the microstructure of micro-interface between grade Ⅲ fly ash and cement paste is densified, the nanoindentation modulus and hardness of micro-interface are improved. Therefore, the compressive strengths of concrete containing grade Ⅲ fly ash are increased, and the autogenous shrinkages of concrete are decreased.
英文名 : Influence of Modified Grade Ⅲ Fly Ash on Strength and Autogenous Shrinkage of Concrete
刊期 : ２０19年第11期
关键词 : 改性Ⅲ级粉煤灰；混凝土；强度；自收缩；微界面
Key words : Modified grade Ⅲ fly ash; Concrete; Strength; Autogenous shrinkage; Micro-interface
刊期 : ２０19年第11期
DOI : 10.19761/j.1000-4637.2019.11.017.04
文章编号 :
基金项目 : 国家自然科学基金项目（51778003）；陕西省高性能混凝土工程实验室开放基金资助项目（SHPC201705）；江苏省建设系统科技项目（2017ZD23）；苏州市建筑节能科技支撑项目（苏住建科[2019]4号）。
作者 : 陈 登1,2，张钰晖2，高世明2，宋旭艳2
单位 : 1.陕西省高性能混凝土工程实验室，渭南714000；2.苏州科技大学土木工程学院，215011

陈 登1,2，张钰晖2，高世明2，宋旭艳2

陈登,张钰晖,高世明,等.改性Ⅲ级粉煤灰对混凝土强度和自收缩的影响[J].混凝土与水泥制品,2019(11):17-20.

CHEN D,ZHANG Y H,GAO S M,et al.Influence of Modified Grade Ⅲ Fly Ash on Strength and Autogenous Shrinkage of Concrete[J].China Concrete and Cement Products,2019(11):17-20.

摘要
参数
结论
参考文献
引用本文

摘  要：采用电石渣对Ⅲ级粉煤灰进行增钙煅烧改性，利用XRD对改性Ⅲ级粉煤灰的矿物组成进行分析，测定了掺入改性Ⅲ级粉煤灰的C30混凝土的抗压强度和自收缩，并采用BSEM和纳米压痕仪分析了改性Ⅲ级粉煤灰与水泥浆体的微界面结构及微界面力学性能。结果表明：Ⅲ级粉煤灰经增钙煅烧改性后生成了水硬性矿物β-C2S，水化可生成C-S-H凝胶，改善了Ⅲ级粉煤灰颗粒与水泥浆体的微界面区结构，提高了微界面区的弹性模量和硬度，从而提高了掺Ⅲ级粉煤灰混凝土的强度，并降低了其自收缩。
Abstract: The grade Ⅲ fly ash was modified through calcination method by mixing carbide slag, the mineral compositions of the modified grade Ⅲ fly ash were characterized by XRD. The effects of modified grade Ⅲ fly ash on compressive strength and autogenous shrinkage of C30 concrete were investigated. The microstructure and mechanical properties of micro-interface between modified grade Ⅲ fly ash and cement paste were analyzed by using backscattered electron microscopy (BSEM) and nanoindentation technique. The results show that the β-C2S phases are formed after the grade Ⅲ fly ash was modified. Due to the hydration of the β-C2S, C-S-H gel is generated, the microstructure of micro-interface between grade Ⅲ fly ash and cement paste is densified, the nanoindentation modulus and hardness of micro-interface are improved. Therefore, the compressive strengths of concrete containing grade Ⅲ fly ash are increased, and the autogenous shrinkages of concrete are decreased.

关键词:
改性Ⅲ级粉煤灰；混凝土；强度；自收缩；微界面
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（1）Ⅲ级粉煤灰经增钙煅烧改性后，能提高掺Ⅲ级粉煤灰混凝土的抗压强度，同时降低混凝土的自收缩。
（2）改性Ⅲ级粉煤灰生成的水硬性矿物β-C2S，水化生成了C-S-H凝胶，可以改善Ⅲ级粉煤灰颗粒与水泥浆体的微界面区结构，提高微界面区的弹性模量和硬度。

[1] LURA P,JENSEN O M,VAN B K.Autogenous shrinkage in high-performance cement paste: An evaluation of basic mechanisms[J].Cement and Concrete Research,2003,33(2):223-232.
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[4] 郝成伟,邓敏,莫立武,等.粉煤灰对水泥浆体自收缩和抗压强度的影响[J].建筑材料学报,2011(6):746-751.
[5] 王雪芳,郑建岚.矿物掺合料对高性能混凝土自收缩影响及计算模型研究[J].建筑结构学报,2010,31(2):93-98.
[6] 田倩.低水胶比大掺量矿物掺合料水泥基材料的收缩及机理研究[D].南京:东南大学,2005.
[7] SEMWI Y, HASAN S A. Effects of fly ash fineness on the mechanical properties of concrete[J].Sādhanā,2012(3):389-403.
[8] 刘飞鹏,龚爱民,彭玉林,等.掺碱激发剂粉煤灰-水泥胶砂强度性能试验研究[J].水利发电,2014(7):100-102.
[9] 李诗杨.粉煤灰表面改性及其对水泥浆体干燥收缩和强度的影响[D].南京:南京工业大学,2010.
[10] MA Y, YE G. The shrinkage of alkali activated fly ash[J]. Cement and Concrete Research,2015,68:75-82.
[11] Tangtermsirikul S. Effect of chemical composition and particle size of fly ash on autogenous shrinkage of paste[C]. Proceedings of the International Workshop on Autogenous Shrinkage of Concrete, JCI, Hiroshima, Japan,1998:175-186.
[12] HAO C W,DENG M, MO L W,et al. Surface modification of fly ashes with carbide slag and its effect on compressive strength and autogenous shrinkage of blended cement pastes[J]. Journal of Wuhan University of Technology-Mater.Sci.Ed,2012, 27(6):1149-1153.
 

陈登,张钰晖,高世明,等.改性Ⅲ级粉煤灰对混凝土强度和自收缩的影响[J].混凝土与水泥制品,2019(11):17-20.

CHEN D,ZHANG Y H,GAO S M,et al.Influence of Modified Grade Ⅲ Fly Ash on Strength and Autogenous Shrinkage of Concrete[J].China Concrete and Cement Products,2019(11):17-20.

 

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