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气凝胶-水泥复合多孔材料的孔结构与硬化性能
Study on Pore Structure Characterization and Hardened Properties of Aerogel-Cement Porous Composites
2020年第9期
气凝胶浆料;水泥基材料;孔结构;力学性能;保温隔热性能
Aerogel slurry; Cement-based material; Pore structure; Mechanical property; Thermal insulation performance
2020年第9期
10.19761/j.1000-4637.2020.09.011.05
国家重点研发计划项目(2016YFC0701004);四川省科技计划项目(2018GZ0152、18YYJC0904)。
路 珏1,2,蒋 俊1,卢忠远1,李 军1
1.环境友好能源材料国家重点实验室,四川 绵阳 621010;2.西南科技大学 材料科学与工程学院,四川 绵阳 621010

路 珏1,2,蒋 俊1,卢忠远1,李 军1

路珏,蒋俊,卢忠远,等.气凝胶-水泥复合多孔材料的孔结构与硬化性能[J].混凝土与水泥制品,2020(9):11-15.

LU J,JIANG J,LU Z Y,et al.Study on Pore Structure Characterization and Hardened Properties of Aerogel-Cement Porous Composites[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(9):11-15.

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摘   要:采用体积取代法将气凝胶浆料引入水泥基体中,制备了气凝胶-水泥复合多孔材料(ACPC),结合压汞(MIP)、氮吸附(NAD)和扫描电子显微镜(SEM)对ACPC孔结构和微观形貌进行表征,研究了ACPC的孔结构和硬化性能。试验结果表明,当气凝胶浆料取代量由0 增加到66%时,材料孔隙率从23.0%上升至78.1%,平均孔径从45.3 nm增加至198.3 nm。气凝胶的引入可以细化孔结构,材料介孔孔容由0.03 mL/g增加到0.20 mL/g,孔结构得到改善。在水泥浆体中引入气凝胶浆料,可以得到干密度为365~1 262 kg/m3、抗压强度为0.8~24.1 MPa、导热系数为0.066~0.364 W/(m·K)的ACPC。 Abstract: Aerogel slurry was introduced into cement system to prepare aerogel-cement porous composites (ACPC) by volume substitution method. MIP, NAD and SEM were used to characterizate the pore structure and morphology of ACPC. The pore structure and hardened properties of ACPC were investigated. The results show that the porosity of ACPC increases from 23% to 78.1% and the average pore diameter of ACPC increases from 45.3 nm to 198.3 nm with the increasing aerogel slurry replacement from 0 to 66 %. The aerogel slurry can refine voids, and the mesoporous volume increases from 0.03 mL/g to 0.20 mL/g. Adding aerogel slurry into cement paste can get ACPC with a dry density, compressive strength and thermal conductivity of 365~1 262 kg/m3, 0.8~24.1 MPa, and 0.066~0.364 W/(m·K), respectively.  
英文名 : Study on Pore Structure Characterization and Hardened Properties of Aerogel-Cement Porous Composites
刊期 : 2020年第9期
关键词 : 气凝胶浆料;水泥基材料;孔结构;力学性能;保温隔热性能
Key words : Aerogel slurry; Cement-based material; Pore structure; Mechanical property; Thermal insulation performance
刊期 : 2020年第9期
DOI : 10.19761/j.1000-4637.2020.09.011.05
文章编号 :
基金项目 : 国家重点研发计划项目(2016YFC0701004);四川省科技计划项目(2018GZ0152、18YYJC0904)。
作者 : 路 珏1,2,蒋 俊1,卢忠远1,李 军1
单位 : 1.环境友好能源材料国家重点实验室,四川 绵阳 621010;2.西南科技大学 材料科学与工程学院,四川 绵阳 621010

路 珏1,2,蒋 俊1,卢忠远1,李 军1

路珏,蒋俊,卢忠远,等.气凝胶-水泥复合多孔材料的孔结构与硬化性能[J].混凝土与水泥制品,2020(9):11-15.

LU J,JIANG J,LU Z Y,et al.Study on Pore Structure Characterization and Hardened Properties of Aerogel-Cement Porous Composites[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(9):11-15.

摘要
参数
结论
参考文献
引用本文

摘   要:采用体积取代法将气凝胶浆料引入水泥基体中,制备了气凝胶-水泥复合多孔材料(ACPC),结合压汞(MIP)、氮吸附(NAD)和扫描电子显微镜(SEM)对ACPC孔结构和微观形貌进行表征,研究了ACPC的孔结构和硬化性能。试验结果表明,当气凝胶浆料取代量由0 增加到66%时,材料孔隙率从23.0%上升至78.1%,平均孔径从45.3 nm增加至198.3 nm。气凝胶的引入可以细化孔结构,材料介孔孔容由0.03 mL/g增加到0.20 mL/g,孔结构得到改善。在水泥浆体中引入气凝胶浆料,可以得到干密度为365~1 262 kg/m3、抗压强度为0.8~24.1 MPa、导热系数为0.066~0.364 W/(m·K)的ACPC。

Abstract: Aerogel slurry was introduced into cement system to prepare aerogel-cement porous composites (ACPC) by volume substitution method. MIP, NAD and SEM were used to characterizate the pore structure and morphology of ACPC. The pore structure and hardened properties of ACPC were investigated. The results show that the porosity of ACPC increases from 23% to 78.1% and the average pore diameter of ACPC increases from 45.3 nm to 198.3 nm with the increasing aerogel slurry replacement from 0 to 66 %. The aerogel slurry can refine voids, and the mesoporous volume increases from 0.03 mL/g to 0.20 mL/g. Adding aerogel slurry into cement paste can get ACPC with a dry density, compressive strength and thermal conductivity of 365~1 262 kg/m3, 0.8~24.1 MPa, and 0.066~0.364 W/(m·K), respectively.

 

关键词:
复合
acpc
the
and
to
凝胶
of
slurry
结构
aerogel
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(1)采用气凝胶浆料体积取代水泥浆体制备ACPC,无采用外掺气凝胶粉制备轻质水泥基材料存在的问题,成功获得性能良好的水泥基保温材料。
(2)气凝胶对复合材料的微观结构产生影响,气凝胶掺量越高,材料内部结构越疏松多孔,材料孔隙率增加,平均孔径变大;同时气凝胶的加入可以增加介孔含量并细化气孔,孔结构得到改善。
(3)气凝胶浆料的加入降低了材料的力学性能和导热性能,当气凝胶掺量从25%增加至66%,得到ACPC抗压强度为0.8~24.1 MPa、导热系数为0.066~0.364 W/(m·K),缓解了力学性能与保温性能之间的矛盾。

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路珏,蒋俊,卢忠远,.气凝胶-水泥复合多孔材料的孔结构与硬化性能[J].混凝土与水泥制品,2020(9):11-15.

LU J,JIANG J,LU Z Y,et al.Study on Pore Structure Characterization and Hardened Properties of Aerogel-Cement Porous Composites[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(9):11-15.

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