可再分散乳化沥青粉末改性水泥砂浆的力学性能和微观形貌

doi:10.16085/j.issn.1000-6613.2021-0875

化工进展 ›› 2022, Vol. 41 ›› Issue (4): 2015-2021.DOI: 10.16085/j.issn.1000-6613.2021-0875

可再分散乳化沥青粉末改性水泥砂浆的力学性能和微观形貌

刘竞¹(), 郑新国¹(), 李铁军², 王财平², 赵彦旭³, 李颖¹, 楼梁伟¹, 沈伟⁴

^1.高速铁路轨道技术国家重点实验室，北京 100081
^2.中国铁路兰州局集团有限公司高铁基础设施段，甘肃兰州 730070
^3.中铁二十一局集团有限公司，甘肃兰州 730070
^4.中国铁路乌鲁木齐局集团有限公司高铁基础设施段，新疆乌鲁木齐 830000

收稿日期:2021-04-25 修回日期:2021-05-29 出版日期:2022-04-23 发布日期:2022-04-25
通讯作者: 郑新国
作者简介:刘竞（1982—），男，硕士，副研究员，研究方向为土木工程材料。E-mail：705478890@qq.com。
基金资助:
中国铁道科学研究院集团有限公司科研项目(2021YJ067);甘肃省科技重大专项(19ZD2FA001);中国铁建科技研发计划(2019-B08);兰州局集团公司科技研究开发计划(LZJKY2021056-2)

Mechanical properties and micromorphology of redispersible emulsified asphalt powder modified cement mortar

LIU Jing¹(), ZHENG Xinguo¹(), LI Tiejun², WANG Caiping², ZHAO Yanxu³, LI Ying¹, LOU Liangwei¹, SHEN Wei⁴

^1.State Key Laboratory of High-Speed Railway Track Technology, Beijing 100081, China
^2.High-speed Railway Infrastructure Section, China Railway Lanzhou Group Co. , Ltd. , Lanzhou 730070, Gansu, China
^3.China Railway 21st Bureau Group Co. , Ltd. , Lanzhou 730070, Gansu, China
^4.High-speed Railway Infrastructure Section, China Railway Urumqi Group Company Limited, Urumqi 830000, Xinjiang, China

Received:2021-04-25 Revised:2021-05-29 Online:2022-04-23 Published:2022-04-25
Contact: ZHENG Xinguo

摘要/Abstract

摘要：

为解决水泥基材料脆性大、韧性差问题，本文提出了掺加可再分散乳化沥青粉末（REAP）以改善水泥基材料韧性的方法。试验制备了REAP 掺量为胶凝材料用量0、10%、20%、30%的可再分散乳化沥青颗粒改性水泥砂浆（REAPMCM），研究了REAP对REAPMCM抗压、抗折强度、折压比、弹性模量等力学性能影响，分析了其对水泥水化产物微观形貌影响，对比了其与采用乳化沥青制备水泥乳化沥青砂浆微观形貌。结果表明，随着REAP掺量增加，REAPMCM抗压、抗折强度与弹性模量均有所降低，折压比有所提高，REAP掺量30%的REAPMCM折压比为28.5%，其相比未掺加REAP砂浆的折压比提高了46.6%；掺入REAP改善了水泥基材料的韧性，但其改善效果随着水泥水化龄期增长而有所降低；随着REAP掺量增加，一方面浆体总孔隙率含量有所增大，另一方面水泥水化产物间填充覆盖的沥青膜面积增大，且其断面显微形貌与相同沥青固含量掺量的乳化沥青砂浆断面基本类似，证实了REAP亦可较好分散、成膜分布于水泥水化产物间，达到了其与乳化沥青乳浊液对水泥基材料改性相类似的使用效果。

关键词: 沥青, 水泥, 砂浆, 力学性能, 显微结构

Abstract:

In order to solve the problem of high brittleness and poor toughness of cement-based materials, a method of doping redispersible emulsified asphalt powder (REAP) to improve the toughness of cement-based materials was presented. The redispersible emulsified asphalt particle modified cement mortar (REAPMCM) was prepared, and the REAP contents were 0, 10%, 20% and 30% of the cementitious material, respectively. The effects of REAP on the mechanical properties of REAPMCM, such as compressive strength, flexural strength, flexural-compression ratio and elastic modulus, were studied. The effects of REAP on the micromorphology of cement hydration products were analyzed, and the micromorphology of cement emulsified asphalt mortar prepared with emulsified asphalt was compared. The results showed that with the increase of REAP content, the compressive, flexural strength and elastic modulus of REAPMCM were reduced, and the flexural-compression ratio was increased. The flexural-compression ratio of REAPMCM with 30% REAP was 28.5%, which was 46.6% higher than that without REAP. The addition of REAP improved the toughness of cement-based materials, but as the age of cement hydration increased, its improvement effect decreased. As the amount of REAP increased, the total porosity of the slurry and the asphalt film area between cement hydration products increased, and its section micromorphology was basically similar to that of emulsified asphalt mortar with the same asphalt solid content. It was proved that REAP also had good dispersibility and can be distributed in the cement hydration product as a film, achieving similar application effect as the modification of cement-based materials by emulsified asphalt emulsion.

Key words: asphalt, cement, mortar, mechanical properties, microstructure

中图分类号:

TB332

刘竞, 郑新国, 李铁军, 王财平, 赵彦旭, 李颖, 楼梁伟, 沈伟. 可再分散乳化沥青粉末改性水泥砂浆的力学性能和微观形貌[J]. 化工进展, 2022, 41(4): 2015-2021.

LIU Jing, ZHENG Xinguo, LI Tiejun, WANG Caiping, ZHAO Yanxu, LI Ying, LOU Liangwei, SHEN Wei. Mechanical properties and micromorphology of redispersible emulsified asphalt powder modified cement mortar[J]. Chemical Industry and Engineering Progress, 2022, 41(4): 2015-2021.

图/表 10

表1 高贝利特硫铝酸盐水泥物理力学性能

项目

比表面积

/m²·kg^–1

凝结时间/min

抗压强度/MPa

抗折强度/MPa

初凝

时间

终凝

时间

表2 高贝利特硫铝酸盐水泥化学组成（质量分数）单位：%

SiO₂	Al₂O₃	Fe₂O₃	CaO	MgO	SO₃	TiO₂
17.53	14.82	1.16	46.65	4.86	12.96	0.63

表3 REAPMCM具体配比

样品编号	沥青类型	m_A/m_C	m_W/m_C	m_C/m_S
M0	—	0	0.5	0.5
M1	REAP	0.1	0.5	0.5
M2	REAP	0.2	0.5	0.5
M3	REAP	0.3	0.5	0.5
EM3	EA	0.3	0.5	0.5

图1 不同REAP 掺量的REAPMCM抗压强度

图2 不同REAP掺量的REAPMCM抗折强度

图3 不同REAP 掺量的REAPMCM折压比

图4 不同REAP 掺量的REAPMCM弹性模量

图5 不同REAP 掺量的REAPMCM断面的显微形貌

图6 掺加EA砂浆断面的显微形貌

图7 不同REAP 掺量的REAPMCM的累计孔体积

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可再分散乳化沥青粉末改性水泥砂浆的力学性能和微观形貌

Mechanical properties and micromorphology of redispersible emulsified asphalt powder modified cement mortar

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