冻融循环下沙漠砂纤维混凝土损伤模型研究

硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (7): 2225-2231.

冻融循环下沙漠砂纤维混凝土损伤模型研究

张广泰^1,2, 耿天娇¹, 鲁海波¹, 王明阳¹, 李雪藩¹

1.新疆大学建筑工程学院,乌鲁木齐 830047;
2.新疆维吾尔自治区建筑结构与抗震重点实验室,乌鲁木齐 830047

收稿日期:2021-01-28 修回日期:2021-02-08 出版日期:2021-07-15 发布日期:2021-08-04
通讯作者: 耿天娇,硕士研究生。E-mail:1585618269@qq.com
作者简介:张广泰(1963—),男,教授。主要从事混凝土结构和减隔震方面的研究。E-mail:zgtlxh@126.com
基金资助:
国家自然科学基金(51968070)

Damage Model of Desert Sand Fiber Reinforced Concrete under Freeze-Thaw Cycles

ZHANG Guangtai^1,2, GENG Tianjiao¹, LU Haibo¹, WANG Mingyang¹, LI Xuefan¹

1. School of Engineering, Xinjiang University, Urumqi 830047, China;
2. Key Laboratory of Building Structure and Earthquake Resistance of Xinjiang Uygur Autonomous Region, Urumqi 830047, China

Received:2021-01-28 Revised:2021-02-08 Online:2021-07-15 Published:2021-08-04

摘要/Abstract

摘要： 为研究冻融循环作用下沙漠砂纤维混凝土的损伤模型,对沙漠砂纤维混凝土进行0次、25次、50次、75次、100次、125次及150次的快速冻融试验,分析不同冻融循环次数后沙漠砂纤维混凝土相对动弹性模量、抗压强度及劈裂抗拉强度的衰减规律。结合试验数据,基于指数函数和二次函数建立沙漠砂纤维混凝土的冻融损伤劣化模型。结果表明:与沙漠砂混凝土相比,掺入聚丙烯纤维的沙漠砂混凝土的抗冻融能力有效提高;相对动弹性模量随冻融循环次数的增加而下降;与未冻融相比,150次冻融循环后,沙漠砂纤维混凝土的抗压强度降低了49.5%,劈裂抗拉强度降低了70.13%;建立了两种冻融循环下沙漠砂纤维混凝土损伤模型,其计算值与试验值吻合较好,可为沙漠砂纤维混凝土在严寒地区的应用提供理论参考。

关键词: 沙漠砂, 纤维混凝土, 动弹性模量, 损伤量, 冻融损伤模型

Abstract: In order to study the damage model of desert sand fiber reinforced concrete under freeze-thaw cycles, the rapid freeze-thaw tests of 0 times, 25 times, 50 times, 75 times, 100 times, 125 times and 150 times were carried out on desert sand fiber concrete. The attenuation law of relative dynamic elastic modulus, compressive strength and splitting tensile strength of desert sand fiber concrete after different freeze-thaw cycles were analyzed. Combined with test data, the freeze-thaw damage deterioration model of desert sand fiber concrete was established based on exponential function and quadratic function. The results show that compared with desert sand concrete, the freeze-thaw resistance of desert sand concrete with polypropylene fiber is effectively improved. With the increase of freeze-thaw cycles, the relative dynamic elastic modulus decreases continuously. After 150 freeze-thaw cycles, the compressive strength and splitting tensile strength of desert sand fiber concrete decrease by 49.5% and 70.13% respectively compared with 0 times freeze-thaw cycle. Two damage models of desert sand fiber concrete under freeze-thaw environment are established, and the calculated values are in good agreement with experimental values, which can provide a theoretical reference for the application of desert sand fiber concrete in severe cold areas.

Key words: desert sand, fiber reinforced concrete, dynamic modulus of elasticity, damage amount, freeze-thaw damage model

中图分类号:

TU528

张广泰, 耿天娇, 鲁海波, 王明阳, 李雪藩. 冻融循环下沙漠砂纤维混凝土损伤模型研究[J]. 硅酸盐通报, 2021, 40(7): 2225-2231.

ZHANG Guangtai, GENG Tianjiao, LU Haibo, WANG Mingyang, LI Xuefan. Damage Model of Desert Sand Fiber Reinforced Concrete under Freeze-Thaw Cycles[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(7): 2225-2231.

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