沙漠砂对混凝土徐变的影响

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (12): 4417-4423.

沙漠砂对混凝土徐变的影响

邱成江^1,2, 赵勇^3,4, 何智海⁵

1.滇西应用技术大学建筑工程学院, 大理 671000;
2.滇西应用技术大学建筑材料检测技术工程研究中心, 大理 671000;
3.云南省建筑科学研究院有限公司, 昆明 650223;
4.云南省建筑结构与新材料企业重点实验室, 昆明 650223;
5.绍兴文理学院土木工程学院, 绍兴 312000

收稿日期:2024-05-30 修订日期:2024-07-01 出版日期:2024-12-15 发布日期:2024-12-19
通信作者: 何智海,博士,教授。E-mail:zhihaihe1981@126.com
作者简介:邱成江(1986—),男,高级工程师。主要从事混凝土方面的研究。E-mail:2210059@wyuas.edu.cn
基金资助:
国家自然科学基金(51602198);滇西应用技术大学项目(2021KYPT0004)

Influence of Desert Sand on Creep of Concrete

QIU Chengjiang^1,2, ZHAO Yong^3,4, HE Zhihai⁵

1. School of Civil Engineering and Architecture, West Yunnan University of Applied Sciences, Dali 671000, China;
2. Engineering Research Center for Building Material Testing Technology, West Yunnan University of Applied Sciences, Dali 671000, China;
3. Yunnan Institute of Building Research Co.,Ltd., Kunming 650223, China;
4. Yunnan Enterprise Key Laboratory of Building Structure and Innovative Material, Kunming 650223, China;
5. School of Civil Engineering, Shaoxing University, Shaoxing 312000, China

Received:2024-05-30 Revised:2024-07-01 Published:2024-12-15 Online:2024-12-19

摘要/Abstract

摘要： 为进一步推动沙漠砂混凝土的应用,采用预应力加载方式研究了沙漠砂取代不同掺量(25%、50%和75%,质量分数)河砂对混凝土徐变的影响,结合孔结构和微观形貌分析了影响机理。结果表明,当沙漠砂取代25%河砂时,混凝土抗压强度和弹性模量增加,28 d抗压强度和弹性模量分别增加了7.5%和3.6%,混凝土徐变降低,180 d徐变应变降低了31.7%,180 d徐变度降低了35.7%,180 d徐变系数降低了32.1%,继续增加沙漠砂取代率,混凝土强度和弹性模量降低,徐变增加。沙漠砂取代河砂时,与徐变相关的孔径小于50 nm的孔隙率增加;沙漠砂取代25%河砂时,与强度相关的大于50 nm的孔径孔隙率降低,混凝土内部结构变得密实,进一步增加沙漠砂取代率,混凝土内部结构变得疏松。

关键词: 沙漠砂, 混凝土, 徐变, 力学性能, 孔结构, 微观结构

Abstract: In order to further promote the application of desert sand concrete, the influence of desert sand replacing river sand with different content (25%, 50% and 75%, mass fraction) on the creep of concrete was studied by prestressed loading method, and the influence mechanism was analyzed in the combination with pore structure and microscopic morphology. The results show that the desert sand replacing 25% river sand increases the compressive strength and elastic modulus of concrete, which increase by 7.5% and 3.6% at 28 d, respectively, and reduces creep of concrete. The creep strain of concrete at 180 d is reduced by 31.7%, the specific creep at 180 d is reduced by 35.7% and the creep coefficient at 180 d is reduced by 32.1%. With the further increase of the replacement rate of desert sand, the compressive strength and elastic modulus of concrete are reduced, and the creep of concrete is improved. The desert sand replacing river sand increases the porosity with pore diameter less than 50 nm which is associated with the creep. The desert sand replacing 25% river sand reduces the porosity with pore diameter greater than 50 nm of concrete which is associated with the strength, and the internal structure of concrete is improved. With the further increase of the replacement rate of desert sand, the internal structure of concrete is loosened.

Key words: desert sand, concrete, creep, mechanical property, pore structure, microstructure

中图分类号:

TU528

邱成江, 赵勇, 何智海. 沙漠砂对混凝土徐变的影响[J]. 硅酸盐通报, 2024, 43(12): 4417-4423.

QIU Chengjiang, ZHAO Yong, HE Zhihai. Influence of Desert Sand on Creep of Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(12): 4417-4423.

参考文献

[1] WANG X F, DONG C Y, LIU Y H, et al. Effects of seawater and sea sand on early creep of concrete under different stress levels[J]. Construction and Building Materials, 2024, 423: 135765.
[2] AMEL C L, KADRI E H, SEBAIBI Y, et al. Dune sand and pumice impact on mechanical and thermal lightweight concrete properties[J]. Construction and Building Materials, 2017, 133: 209-218.
[3] JIANG J Y, FENG T T, CHU H Y, et al. Quasi-static and dynamic mechanical properties of eco-friendly ultra-high-performance concrete containing aeolian sand[J]. Cement and Concrete Composites, 2019, 97: 369-378.
[4] LI Y G, ZHANG H M, LIU G X, et al. Multi-scale study on mechanical property and strength prediction of aeolian sand concrete[J]. Construction and Building Materials, 2020, 247: 118538.
[5] 刘海峰, 刘一江, 姜彦杰, 等. 冻融循环作用下沙漠砂混凝土抗冻性能研究[J]. 工业建筑, 2023, 53(增刊1): 616-622.
LIU H F, LIU Y J, JIANG Y J, et al. Study on frost resistance of desert sand concrete under freeze-thaw cycle[J]. Industrial Construction, 2023, 53(supplement 1): 616-622 (in Chinese).
[6] 刘海峰, 马荷姣, 刘宁, 等. 粉煤灰及沙漠砂对混凝土抗碳化性能的影响[J]. 硅酸盐通报, 2017, 36(11): 3823-3828+3847.
LIU H F, MA H J, LIU N, et al. Influence of fly ash and desert sand on the carbonation resistance property of concrete[J]. Bulletin of the Chinese Ceramic Society, 2017, 36(11): 3823-3828+3847 (in Chinese).
[7] 王丹, 车佳玲, 舒宏博, 等. 沙漠砂-水泥基材的收缩特性[J]. 材料科学与工程学报, 2021, 39(6): 1021-1027.
WANG D, CHE J L, SHU H B, et al. Shrinkage properties of desert sand cementitious materials[J]. Journal of Materials Science and Engineering, 2021, 39(6): 1021-1027 (in Chinese).
[8] LEE E, PARK S, KIM Y. Drying shrinkage cracking of concrete using dune sand and crushed sand[J]. Construction and Building Materials, 2016, 126: 517-526.
[9] 王雪艳, 刘明辉, 刘萱, 等. 沙漠砂+机制砂混凝土力学性能及碳排放研究[J]. 土木工程学报, 2022, 55(2): 23-30.
WANG X Y, LIU M H, LIU X, et al. Study on mechanical properties and carbon emissions of desert sand and machine-made sand concrete[J]. China Civil Engineering Journal, 2022, 55(2): 23-30 (in Chinese).
[10] 许建疆, 郭军林, 甘丹, 等. 粉煤灰微珠-沙漠砂陶粒混凝土力学性能试验[J]. 复合材料学报, 2024, 41(1): 348-360.
XU J J, GUO J L, GAN D, et al. Experimental study on mechanical properties of fly ash cenospheres-desert sand ceramsite concrete[J]. Acta Materiae Compositae Sinica, 2024, 41(1): 348-360 (in Chinese).
[11] HE Z H, QIAN C X. Internal relative humidity and creep of concrete with modified admixtures[J]. Progress in Natural Science: Materials International, 2011, 21(5): 426-432.
[12] 苏英. 盐冻环境下风积沙混凝土耐久性研究[D]. 包头: 内蒙古科技大学, 2019.
SU Y. Study on durability of aeolian sand concrete in salt freezing environment[D]. Baotou: Inner Mongolia University of Science & Technology, 2019 (in Chinese).
[13] HE Z H, LI L Y, DU S G. Creep analysis of concrete containing rice husk ash[J]. Cement and Concrete Composites, 2017, 80: 190-199.
[14] HONG S H, CHOI J S, YUAN T F, et al. A review on concrete creep characteristics and its evaluation on high-strength lightweight concrete[J]. Journal of Materials Research and Technology, 2023, 22: 230-251.
[15] WANG L, YANG H Q, DONG Y, et al. Environmental evaluation, hydration, pore structure, volume deformation and abrasion resistance of low heat Portland (LHP) cement-based materials[J]. Journal of Cleaner Production, 2018, 203: 540-558.
[16] MEHTA P K, MONTEIRO P J M. Concrete: microstructure, properties, and materials[M]. 3rd ed. New York: McGraw-Hill, 2006.