摘要
在实际工程中,大体积混凝土常因为内外温差太大,而导致混凝土表面出现裂缝。为了解决该问题,采用功能梯度混凝土设计思路,在混凝土芯部采用大掺量矿物掺合料粉煤灰+矿粉,并外掺新型内养护型水化热抑制剂,降低混凝土内胶凝材料的水化放热量,进而降低混凝土的内外温差;在外圈0.5~2 m范围内的混凝土中掺加聚丙烯纤维及膨胀剂,提高混凝土抗开裂性能。通过计算机模拟结果发现,该方法能够将混凝土的内外温差降为19.5℃;最小抗裂安全性由1.04提高到1.47,抗裂安全性得到明显的提高。并且现场实验结果也符合模拟结果,其内外温差分别为20.4℃和12.2℃,都满足≤25℃的控制标准。
In actual engineering,cracks often appear on the surface of mass concrete because of the large temperature difference between inside and outside.The design idea of functionally graded concrete is adopted.A large amount of mineral admixture of fly ash+mineral powder is used in the core of concrete,and a new internal curing type and hydration heat inhibitor are added to reduce the internal temperature;Polypropylene fiber and expansion agent are added to the concrete within 0.5~2 m of the outer ring to improve the cracking resistance of the concrete.A computerized simulation for functionally graded concrete is carried out.Results show that the temperature difference between inside and outside concrete can be reduced to 19.5℃;And the minimum anti-crack safety was increased from 1.04 to 1.47,the anti-crack safety was significantly improved.The field test results also conform to the simulation results,with the internal and external temperature differences of 20.4℃and 12.2℃,both meeting the control standard of≤25℃.
作者
谢红
周志金
江昂
冯童
刘诗娟
张永园
XIE Hong;ZHOU Zhi-jin;JIANG Ang;FENG Tong;LIU Shi-juan;ZHANG Yong-yuan(Hubei Hanjiang Yakou Navigation Hub Project Construction Headquarters,Xiangyang 441499,China;State Key Laboratory of Silicate Building Materials for Architecture,Wuhan University of Technology,Wuhan 430070,China)
出处
《武汉理工大学学报》
CAS
2023年第2期13-19,共7页
Journal of Wuhan University of Technology
关键词
功能梯度混凝土
温度场
温度应力
functionally graded concrete
temperature field
temperature stress
