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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

41卷

期数:

2024年02期

页码:

39-48

栏目:

建筑材料

出版日期:

2024-03-30

文章信息/Info

Title:

Mechanical and microscopic properties of dredged sand mortar at different thermostatic time

文章编号:

1673-2049(2024)02-0039-10

作者:

吴朝国¹,陈徐东¹,宁英杰²,张 伟^3,4

(1. 河海大学 土木与交通学院,江苏 南京 210098; 2. 浙江交工集团股份有限公司,浙江 杭州 310051; 3. 河海大学 水利水电学院,江苏 南京 210098; 4. 扬州市水利局,江苏 扬州 225000)

Author(s):

WU Chaoguo¹, CHEN Xudong¹, NING Yingjie², ZHANG Wei^3,4

(1. College of Civil Engineering and Transportation, Hohai University, Nanjing 210098, Jiangsu, China; 2. Zhejiang Communications Construction Group Co., Ltd., Hangzhou 310051, Zhejiang, China; 3. College of Water Resources and Hydropower, Hohai University, Nanjing 210098, Jiangsu, China; 4. Yangzhou Water Resources Bureau, Yangzhou 225000, Jiangsu, China)

关键词:

疏浚砂砂浆;  恒温时间;  疏浚砂掺量;  力学性能;  微观结构

Keywords:

dredged sand mortar;  thermostatic time;  dredged sand admixture;  mechanical property;  microstructure

分类号:

TU37

DOI:

10.19815/j.jace.2022.04110

文献标志码:

A

摘要:

为了对不同恒温时间下不同疏浚砂掺量砂浆的特性进行研究,选取恒温时间(4、8、12、16 h)、疏浚砂掺量(0%、15%、50%)为试验变量,利用长江下游疏浚砂替代机制砂制备了15组试件进行试验,根据试验结果分析了不同恒温时间对不同疏浚砂掺量砂浆抗压性能及微观结构的作用机理。结果表明:当疏浚砂掺量为0%和50%时,随着恒温时间增加,后期抗压强度先增大后减小,恒温时间为8 h时最大; 当疏浚砂掺量为15%时,随着恒温时间增加,后期抗压强度逐渐减小,恒温时间为4 h时最大; 恒温时间越长,蒸养损伤越大,不利于后期强度发展,不同疏浚砂掺量下变化规律不同; 随着疏浚砂掺量增加,后期抗压强度先增大后减小,疏浚砂掺量为15%时最大; 掺入疏浚砂对砂浆抗压强度有一定的优化作用,粒径极小的疏浚砂颗粒能有效填充砂浆中的孔隙缺陷,特别是经过蒸养损伤过后的砂浆,蒸养条件下疏浚砂的优化作用被放大,疏浚砂砂浆的抗压强度得到了进一步提升,疏浚砂对蒸养砂浆抗压强度的提升远大于标养砂浆,且恒温时间越长,抗压强度提升越明显; 在恒温时间为4～8 h、疏浚砂掺量为15%的情况下,能制备出性能不低于纯机制砂砂浆的蒸养疏浚砂砂浆。

Abstract:

In order to investigate the characteristics of mortars with different dredged sand admixtures and different thermostatic time, the thermostatic time(4, 8, 12, 16 h)and the dredged sand admixtures(0%, 15%, 50%)were selected as test variables. 15 sets of specimens were prepared for testing using dredged sand instead of mechanism sand from Yangtze River, and the mechanism of the effect of different thermostatic time on the compressive properties and microstructure of mortar with different dredged sand admixtures was analyzed based on the test results. The results show that when the dredged sand admixture is 0% and 50%, the later compressive strength first increases and then decreases with the increase of thermostatic time, and the maximum is at the thermostatic time of 8 h. When the dredged sand admixture is 15%, its compressive strength gradually decreases with the increase of thermostatic time, and the maximum is at the thermostatic time of 4 h. The longer the thermostatic time, the greater the distillation damage, which is unfavorable to the later strength development, and the different change laws under different dredged sand admixtures. With the increase of dredged sand admixture, the later compressive strength first increases and then decreases, and the maximum is at 15% of dredged sand admixture. Dredged sand has a certain optimization effect on the compressive strength of mortar, and dredged sand particles with very small particle size can effectively fill the pore defects in mortar, especially after the distillation damage of mortar. The optimization effect of dredged sand is amplified under the steaming condition, and the compressive strength of dredged sand mortar is further enhanced, and the enhancement of compressive strength of steam curing mortar by dredged sand is much greater than that of standard curing mortar, and the longer the thermostatic time is, the more obvious the enhancement of compressive strength is. When the thermostatic time is 4-8 h and the dredged sand admixture is 15%, the steam-raised dredged sand mortar with the performance not lower than that of pure machine-made sand mortar can be prepared.

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备注/Memo

备注/Memo:

收稿日期:2023-04-26
基金项目:国家重点研发计划项目(2021YFB2600200); 国家自然科学基金项目(51979090); 国家重点实验室开放基金项目(2019CEM002)

通信作者:陈徐东(1985-),男,工学博士,教授,博士生导师,E-mail:cxdong1985@163.com。

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更新日期/Last Update: 2024-03-25