低热硅酸盐水泥高温强度特性及其机理研究

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (9): 3100-3108.

低热硅酸盐水泥高温强度特性及其机理研究

沈鑫, 王敏, 黄文, 张坤悦, 郭随华, 文寨军

中国建筑材料科学研究总院有限公司,北京 100024

收稿日期:2023-05-08 修订日期:2023-07-03 出版日期:2023-09-15 发布日期:2023-09-14
通信作者: 郭随华,博士,教授级高级工程师。E-mail:sh_guo@sina.com
作者简介:沈鑫(1998—),男,硕士研究生。主要从特种水泥方面的研究。E-mail:599292237@qq.com
基金资助:
中国建材集团攻关专项资助(2021HX0708)

Strength Characteristics and Mechanism of Low-Heat Portland Cement at High Temperature

SHEN Xin, WANG Min, HUANG Wen, ZHANG Kunyue, GUO Suihua, WEN Zhaijun

China Building Materials Academy Co., Ltd., Beijing 100024, China

Received:2023-05-08 Revised:2023-07-03 Online:2023-09-15 Published:2023-09-14

摘要/Abstract

摘要： 低热硅酸盐水泥具有高温下强度稳定增长的特性,本文以硅酸盐水泥和低热硅酸盐水泥互为对比,研究了在水泥砂浆成型之后直接进行热养护(50~80 ℃)和标准养护1 d后再进行热养护两种情况下的强度发展和水泥浆体的物相组成、孔隙发展、微观形貌特征。结果表明:高温条件下水泥强度损伤行为源于水化后期的微结构劣化,但这一行为与水化初期受热密切相关,低热硅酸盐水泥在高温下较低的水化速率使其水化产物更均匀、密实,浆体的孔结构不随温度的升高以及受热方式的改变出现明显劣化,因此其强度在高温下仍能保持稳定增长;硅酸盐水泥后期由高温引发的钙矾石分解并没有直接导致强度倒缩,但水化初期过高的水化速率使水泥浆体出现更多的孔洞和缺陷,加速了后期由高温引起的单硫型水化硫铝酸钙(AFm)、Ca(OH)₂析出与生长,且诱发浆体孔隙率增大。

关键词: 低热硅酸盐水泥, 养护温度, 水化产物, 孔结构, 微观形貌

Abstract: Low-heat Portland cement has the characteristic of stable strength growth at high temperature. In this paper, the strength development of mortar and phase composition, pore development and micromorphology of cement paste under thermal curing (50~80 ℃) after forming and thermal curing after standard curing for 1 d were studied by comparing Portland cement and low-heat Portland cement. The results show that the cement strength collapses under high temperature conditions due to the microstructure deterioration in the later stage of hydration, but this behavior is closely related to the heat in the early stage of hydration. The slow hydration rate of low-heat Portland cement at high temperature makes the hydration products uniform and dense, and the pore structure of paste does not deteriorate with the increase of temperature and the change of heating way. Therefore, its strength can maintain a steady increase at high temperature. The decomposition of ettringite caused by high temperature in the later stage of Portland cement does not directly lead to strength collapse, but the quickly hydration rate of Portland cement in the early stage leads to more holes and defects in the cement paste, accelerates the precipitation and growth of AFm and Ca(OH)₂ caused by high temperature in the later stage, and induces the increase of porosity.

Key words: low-heat Portland cement, curing temperature, hydration product, pore structure, micromorphology

中图分类号:

TQ172.1

沈鑫, 王敏, 黄文, 张坤悦, 郭随华, 文寨军. 低热硅酸盐水泥高温强度特性及其机理研究[J]. 硅酸盐通报, 2023, 42(9): 3100-3108.

SHEN Xin, WANG Min, HUANG Wen, ZHANG Kunyue, GUO Suihua, WEN Zhaijun. Strength Characteristics and Mechanism of Low-Heat Portland Cement at High Temperature[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(9): 3100-3108.

参考文献

[1] TAYLOR H F W. Cement chemistry[M]. London: Thomas Telford Publishing, 1997.
[2] BAHAFID S, GHABEZLOO S, FAURE P, et al. Effect of the hydration temperature on the pore structure of cement paste: experimental investigation and micromechanical modelling[J]. Cement and Concrete Research, 2018, 111: 1-14.
[3] LOTHENBACH B, WINNEFELD F, ALDER C, et al. Effect of temperature on the pore solution, microstructure and hydration products of Portland cement pastes[J]. Cement and Concrete Research, 2007, 37(4): 483-491.
[4] GAJEWICZ-JAROMIN A M, MCDONALD P J, MULLER A C A, et al. Influence of curing temperature on cement paste microstructure measured by ¹H NMR relaxometry[J]. Cement and Concrete Research, 2019, 122: 147-156.
[5] GALLUCCI E, ZHANG X, SCRIVENER K L. Effect of temperature on the microstructure of calcium silicate hydrate (C-S-H)[J]. Cement and Concrete Research, 2013, 53: 185-195.
[6] 谭克锋, 刘涛. 早期高温养护对混凝土抗压强度的影响[J]. 建筑材料学报, 2006, 9(4): 473-476.
TAN K F, LIU T. Effect of high temperature curing on compressive strength of concrete[J]. Journal of Building Materials, 2006, 9(4): 473-476 (in Chinese).
[7] NIU D T, ZHANG S H, WANG Y, et al. Effect of temperature on the strength, hydration products and microstructure of shotcrete blended with supplementary cementitious materials[J]. Construction and Building Materials, 2020, 264: 120234.
[8] 彭波. 蒸养制度对高强混凝土性能的影响[D]. 武汉: 武汉理工大学, 2007: 83-89.
PENG B. Influence of steam curing system on properties of high strength concrete[D]. Wuhan: Wuhan University of Technology, 2007: 83-89 (in Chinese).
[9] 王晶, 郭随华, 隋同波, 等. 高贝利特水泥的高温强度特性研究[J]. 中国建材科技, 1999, 8(1): 8-13.
WANG J, GUO S H, SUI T B, et al. Study on high temperature strength characteristics of high belite cement[J]. China Building Materials Science & Technology, 1999, 8(1): 8-13 (in Chinese).
[10] 沈鑫, 郭随华, 李文伟, 等. 低热硅酸盐水泥水化及性能研究现状[J]. 硅酸盐通报, 2023, 42(2): 383-392.
SHEN X, GUO S H, LI W W, et al. Research status of hydration and properties of low-heat Portland cement[J]. Bulletin of the Chinese Ceramic Society, 2023, 42(2): 383-392 (in Chinese).
[11] SHIRANI S, CUESTA A, MORALES-CANTERO A, et al. Influence of curing temperature on belite cement hydration: a comparative study with Portland cement[J]. Cement and Concrete Research, 2021, 147: 106499.
[12] 阎培渝, 黎梦圆, 周予启. 高温蒸汽养护混凝土试件强度损失的原因分析[J]. 电子显微学报, 2019, 38(1): 82-86.
YAN P Y, LI M Y, ZHOU Y Q. Cause analysis of strength loss of concrete specimens cured by high temperature steam[J]. Journal of Chinese Electron Microscopy Society, 2019, 38(1): 82-86 (in Chinese).
[13] 吴中伟, 廉慧珍. 高性能混凝土[M]. 北京: 中国铁道出版社, 1999: 85.
WU Z W, LIAN H Z. High performance concrete[M]. Beijing: China Railway Publishing House, 1999: 85 (in Chinese).
[14] WANG L, YANG H Q, ZHOU S H, et al. Hydration, mechanical property and C-S-H structure of early-strength low-heat cement-based materials[J]. Materials Letters, 2018, 217: 151-154.

[1]	郭政, 穆松, 庄智杰, 张浩, 张蕾. 中/高度真空环境下水泥基材料性能的研究进展[J]. 硅酸盐通报, 2023, 42(9): 3075-3082.
[2]	李学亮, 赵庆朝, 李伟光, 李勇, 朱阳戈, 宋厚彬, 杨浩, 张艳平. 煤系偏高岭土对混凝土力学性能及微观结构的影响机理[J]. 硅酸盐通报, 2023, 42(9): 3221-3230.
[3]	张涛, 王腾, 张琰, 谭洪波, 刘佳龙, 董超. 矿渣微粉对水泥净浆性能及氯离子固化作用的影响[J]. 硅酸盐通报, 2023, 42(9): 3240-3247.
[4]	邱伟, 孔德文, 崔庚寅, 黄莹蓥, 王玲玲. 偏高岭土-磷石膏基复合胶凝材料性能试验研究[J]. 硅酸盐通报, 2023, 42(9): 3267-3276.
[5]	裴天蕊, 齐冬有, 邹德麟, 蔡永慧, 汪智勇, 郝禄禄, 王亚丽, 张钰, 刘洪印. 矿渣-高贝利特硫铝酸盐水泥抗硫酸盐侵蚀机理的研究[J]. 硅酸盐通报, 2023, 42(8): 2683-2691.
[6]	石信超, 房晶瑞, 郅晓, 陈阁, 马腾坤, 张帅, 曲齐齐. 孔结构和含水量对水泥净浆矿化养护性能的影响[J]. 硅酸盐通报, 2023, 42(8): 2692-2702.
[7]	周丽波, 陈平, 胡成, 荣北国, 张健, 梁翔, 夏海洋, 梁志锋. 钢渣-赤泥-水泥基复合砂浆的水化硬化特性[J]. 硅酸盐通报, 2023, 42(8): 2837-2845.
[8]	陈濛濛, 宋亚坤, 崔佳乐, 曹君营, 李冰, 刘军辉, 刘振. 介孔CuCo/FeCeO_x催化剂协同催化类Fenton反应[J]. 硅酸盐通报, 2023, 42(8): 2985-2993.
[9]	余震, 孙江涛, 吴定略, 卢自立, 何涛, 李志堂, 沈卫国. 机制砂中泥粉对砂浆与混凝土性能的影响[J]. 硅酸盐通报, 2023, 42(7): 2372-2381.
[10]	陈盟, 周明凯, 王杰, 陈立顺. 循环流化床飞灰对泡沫混凝土性能的影响[J]. 硅酸盐通报, 2023, 42(7): 2447-2457.
[11]	刘进, 韩达, 张增起. 单掺粉煤灰和矿渣粉对磷酸镁水泥水化进程及强度的影响[J]. 硅酸盐通报, 2023, 42(7): 2472-2478.
[12]	赵燕茹, 张建新, 李娜, 关鹤. 基于核磁共振法的纳米TiO₂混凝土抗冻性能研究[J]. 硅酸盐通报, 2023, 42(6): 2015-2026.
[13]	刘玉涛, 高艺榕, 马必聪. 内养生混凝土力学行为及抗氯离子渗透性能研究[J]. 硅酸盐通报, 2023, 42(6): 2027-2036.
[14]	陈曦平, 王诏田, 罗洪杰, 程岩, 吴林丽, 姜昊. 粉煤灰基多孔地聚物的结构及过滤性能[J]. 硅酸盐通报, 2023, 42(6): 2081-2091.
[15]	谢虢伦, 钟卿瑜, 杨翼玮, 黄敦文, 彭晖. 偏高岭土-矿渣地聚物孔结构及介质传输性能研究[J]. 硅酸盐通报, 2023, 42(6): 2092-2105.