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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03期

页码:

10-17

栏目:

建筑材料

出版日期:

2024-05-20

文章信息/Info

Title:

Study on mechanical properties and water absorption characteristics of fly ash concrete modified by nano-SiO₂

文章编号:

1673-2049(2024)03-0010-08

作者:

蒋建华,卢宸宸,师效哲,陈林林,周家冰

(河海大学 土木与交通学院,江苏 南京 210024)

Author(s):

JIANG Jianhua, LU Chenchen, SHI Xiaozhe, CHEN Linlin, ZHOU Jiabing

(College of Civil and Transportation Engineering, Hohai University, Nanjing 210024, Jiangsu, China)

关键词:

粉煤灰混凝土;  纳米SiO₂;  力学性能;  吸水特性;  毛细吸水系数

Keywords:

fly ash concrete;  nano-SiO₂;  mechanical property;  water absorption characteristic;  capillary water absorption coefficient

分类号:

TU528

DOI:

10.19815/j.jace.2022.08071

文献标志码:

A

摘要:

为了探索粉煤灰混凝土的高性能,开展了纳米SiO₂改性粉煤灰混凝土的力学和吸水试验,研究了粉煤灰取代率和纳米SiO₂掺量对混凝土力学性能(抗压强度、劈拉强度、动弹性模量)和吸水特性的影响。结果表明:粉煤灰混凝土的力学性能指标均随纳米SiO₂掺量的增加先增大后减小; 当纳米SiO₂掺量从0%增加至2%时,粉煤灰混凝土28 d抗压强度、劈拉强度和动弹性模量分别提高了12.90%、7.53%和5.85%,可见纳米SiO₂对抗压强度影响更显著; 当粉煤灰取代率从10%增加至30%时,混凝土28 d抗压强度、劈拉强度和动弹性模量分别降低了7.24%、2.61%和9.87%,可见粉煤灰对动弹性模量影响更显著; 随纳米SiO₂掺量增加,粉煤灰混凝土的毛细吸水系数呈现出先下降后上升的趋势; 随粉煤灰取代率增加,混凝土毛细吸水系数增大,且纳米SiO₂对混凝土毛细吸水系数影响也越显著; 粉煤灰取代率和纳米SiO₂掺量对混凝土力学性能与毛细吸水系数之间的相关性无显著影响,混凝土抗压强度、劈拉强度以及动弹性模量与毛细吸水系数均呈现负相关性,其中抗压强度与毛细吸水系数相关性最好。

Abstract:

In order to explore the high performance of fly ash concrete, the mechanical and water absorption tests of nano-SiO₂ modified fly ash concrete were carried out. The effects of replacement rate of fly ash and nano-SiO₂ content on the mechanical properties(compressive strength, splitting tensile strength and dynamic elastic modulus)and water absorption characteristics of concrete were studied. The results show that the mechanical properties of fly ash concrete increase first and then decrease with the increase of nano-SiO₂ content. When the nano-SiO₂ content increases from 0% to 2%, the 28 d compressive strength, splitting tensile strength and dynamic elasticity modulus of fly ash concrete increase by 12.90%, 7.53% and 5.85%, respectively. Therefore, nano-SiO₂ has a more significant impact on the compressive strength. When the replacement rate of fly ash increases from 10% to 30%, the 28 d compressive strength, splitting tensile strength and dynamic elastic modulus of concrete decrease by 7.24%, 2.61% and 9.87%, respectively, so the influence of fly ash on the dynamic elastic modulus is more significant. With the increase of nano-SiO₂ content, the capillary water absorption coefficient of fly ash concrete shows a trend of first decreasing and then increasing. The capillary water absorption coefficient of concrete increases with the increase of replacement rate of fly ash. The higher the replacement rate of fly ash, the more significant the influence of nano-SiO₂ on the capillary water absorption coefficient of concrete. The replacement rate of fly ash and the content of nano-SiO₂ have no significant influence on the correlation between the mechanical properties of concrete and the capillary water absorption coefficient. The compressive strength, splitting tensile strength, and dynamic elastic modulus of concrete have negative correlation with the capillary water absorption coefficient, and the compressive strength has the best correlation with the capillary water absorption coefficient.

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相似文献/References:

[1]肖建庄,陈祥磊,李 标,等.纳米SiO2和粉煤灰复掺对再生混凝土性能的影响[J].建筑科学与工程学报,2020,37(01):26.[doi:10.19815/j.jace.2019.03027]
　XIAO Jian-zhuang,CHEN Xiang-lei,LI Biao,et al.Effect of Mixed Nano-SiO2 and Fly Ash on Properties of Recycled Aggregate Concrete[J].Journal of Architecture and Civil Engineering,2020,37(03):26.[doi:10.19815/j.jace.2019.03027]

备注/Memo

备注/Memo:

收稿日期:2023-08-11
基金项目:国家自然科学基金项目(51408192); 中央高校基本科研业务费专项资金项目(B200202232)
作者简介:蒋建华(1982-),男,工学博士,副教授,E-mail:jjhzxh@hhu.edu.cn。

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更新日期/Last Update: 2024-05-20