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何   蕾

 

（首都医科大学附属北京友谊医院 ，北京 100050)

摘   要 ：为提升低热硅酸盐水泥混凝土强度和抗裂性 ，制备粉煤灰复合低热硅酸盐水泥混凝土 ，测试抗压与抗折强度 、热力学特性以及不同应用环境下的抗裂性。结果表明： 粉煤灰复合低热硅酸盐水泥混凝土抗压强度平均值达 53 . 33 MPa ,  抗折强度平均值为 4. 67 MPa ,  优于低热硅酸盐水泥混凝土 ；粉煤灰复合低热硅酸盐水泥混凝土放热速率 、放热量及绝热温升均低于低热硅酸盐水泥混凝土 ，且在 25℃恒温恒湿 、35℃恒温恒湿 、35℃恒温＋持续风速 10 m/s 三种应用环境下抗裂性更优。粉煤灰复合低热硅酸盐水泥混凝土可显著改善水化热性能并抑制开裂 ，适用于大体积混凝土等温控严格的工程领域。

关键词：粉煤灰复合低热硅酸盐水泥 ；热力学 ；抗裂性

中图分类号：TV41           文献标志码：A            文章编号： 1005- 8249  (2025)  04- 0057- 05

DOI:10. 19860/j.cnki.issn1005 - 8249.2025 .04.011

 

HE Lei

(Beijing Friendship Hospital ,  Capital Medical University ,  Beijing 100050 ,  China)

Abstract : To improve the strength and crack resistance of low heat Portland cement concrete ,  fly ash composite low heat Portland cement concrete was prepared ,  and  the compressive and flexural strength ,  thermodynamic  properties ,  and  crack resistance under different application environments were tested.  The results show that the average compressive strength of fly ash composite low heat Portland cement concrete is 53 . 33 MPa ,  and the average flexural strength is 4. 67 MPa ,  which is better than low heat Portland cement concrete; The heat release rate ,  heat release ,  and adiabatic temperature rise of fly ash composite low heat Portland cement concrete are lower than those of low heat Portland cement concrete  and the crack resistance is better in three application environments :  constant temperature and humidity at 25 ℃ ,  constant temperature and humidity at 35 ℃ ,  and constant temperature and continuous wind speed at 35  ℃ + 10 m/s .  Therefore ,  fly ash composite low heat Portland cement concrete can significantly improve its hydration heat performance and suppress cracking ,  making it suitable for engineering fields with strict temperature control such as large volume concrete .

Key words : fly ash composite low heat portland cement; thermodynamics; crack resistance

作者简介： 何    蕾  (1985—) ,   女 ，本科 ，工程师 ，研究方向 ：建筑材料。

收稿日期：2025 - 03 - 31