冻融作用下风积沙浮石混凝土孔结构分形特征

薛慧君; 郑建庭; 邹春霞; 侯雨丰; 刘鑫

doi:10.13204/j.gyjzG21090911

冻融作用下风积沙浮石混凝土孔结构分形特征

doi: 10.13204/j.gyjzG21090911

1. 内蒙古农业大学水利与土木建筑工程学院, 呼和浩特 010018;
2. 内蒙古农业大学能源与交通工程学院, 呼和浩特 010018;
3. 鄂尔多斯应用技术学院土木工程系, 内蒙古鄂尔多斯 017000

基金项目:

内蒙古科技重大专项项目（2021ZD0007）；内蒙古自然科学基金项目（2020BS05008）；内蒙古农业大学引进优秀博士人才科研启动资助项目（NDYB2018-40）。

详细信息

作者简介:
薛慧君,男,1989年出生,讲师,博士。电子信箱:xuehuijun@yeah.net

计量
- 文章访问数: 132
- HTML全文浏览量: 28
- PDF下载量: 0
- 被引次数: 0
出版历程
- 收稿日期: 2021-09-09
- 网络出版日期: 2022-04-24

Fractal Characteristics of Pore Structure of Aeolian Sand Pumice Concrete Subjected to Freeze-thaw Cycles

1. College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China;
2. College of Energy and Traffic Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China;
3. Department of Civil Engineering, Ordos Institute of Technology, Ordos 017000, China

摘要

摘要: 利用天然浮石作为粗骨料，以沙漠风积沙等质量替代部分河砂作为细骨料，配制风积沙浮石混凝土并对其进行抗冻耐久性试验。借助核磁共振技术对冻融循环作用下不同风积沙替代率的浮石混凝土孔结构进行测试，并揭示冻融循环作用下风积沙浮石混凝土孔结构与分形维数间关系。结果表明：风积沙替代率低于40%对浮石混凝土抗冻性影响不大，但风积沙替代率为60%的浮石混凝土抗冻性不满足设计要求；风积沙浮石混凝土中大毛细孔（100 nm<r≤1 000 nm）占比多可增强其抗冻性，而有害孔（r>1 000 nm）占比多会削弱其抗冻性；分形维数D_max变化可反映混凝土微毛细孔（r≤100 nm）和有害孔（r>1 000 nm）占比变化。该研究可以为风积沙浮石混凝土在寒冷地区土木与水利工程中的应用提供理论支撑。
- 冻融循环 /
- 风积沙 /
- 浮石混凝土 /
- 核磁共振 /
- 孔结构 /
- 分形维数
Abstract: Natural pumice stone was used as coarse aggregate, and part of river sand was replaced by desert aeolian sand as fine aggregate. Aeolian sand pumice concrete was prepared and tested for frost resistance and durability. With the help of nuclear magnetic resonance, the pore structure of pumice concrete with different replacement rates of aeolian sand under the action of freeze-thaw cycles was tested, and the relations between the pore structure of aeolian sand pumice concrete under the action of freeze-thaw cycles and the fractal dimension was revealed. The results showed that:the replacement rate of aeolian sand lower than 40% had little effect on the frost resistance of pumice concrete, but the frost resistance of pumice concrete with the replacement rate of aeolian sand 60% did not meet the design requirements; a greater proportion of large pores in the aeolian sand pumice concrete (100 nm<r ≤ 1 000 nm) could increase its frost resistance, while a greater proportion of harmful pores (r>1 000 nm) could weaken its frost resistance; the change of fractal dimension D_max could reflect the change in the proportion micropores (r ≤ 100 nm) and harmful pores (r>1 000 nm) of concrete. The research could provide theoretical support for the applications of aeolian sand pumice concrete in civil and water conservancy projects in cold regions.
- freeze-thaw cycle /
- aeolian sand /
- pumice concrete /
- nuclear magnetic resonance /
- pore structure /
- fractal dimension

HTML全文

参考文献(24)

[1]	CAI G, NOGUCHI T, DEGÉE H, et al. Volcano-related materials in concretes:a comprehensive review[J]. Environmental Science and Pollution Research, 2016, 23(8):1-24.
[2]	OKTAY H, YUMRUTAR, AKPOLAT A. Mechanical and thermos physical properties of lightweight aggregate concretes[J]. Construction and Building Materials, 2015, 96:217-225.
[3]	薛慧君,申向东,邹春霞,等.浮石及浮石轻骨料混凝土材料研究进展[J].硅酸盐通报, 2016,35(5):1536-1540 ,1546.
[4]	MARíA G, SUSANA L. Aeolian sands:characterization, options of improvement and possible employment in construction-the state-of-the-art[J]. Construction and Building Materials, 2014,73:728-739.
[5]	SHAO X, SUN W, LI X, et al. Experimental study on the mechanical properties and failure characteristics of layered aeolian sand paste-like backfill-a case study from Shanghe coal mine[J]. Minerals, 2021,11(6):577.
[6]	李玉根,张慧梅,刘光秀,等.风积砂混凝土基本力学性能及影响机理[J].建筑材料学报,2020,23(5):1212-1221.
[7]	董伟,肖阳,苏英,等.风积沙混凝土轴心受压力学性能研究[J].工程科学与技术,2020,52(3):86-92.
[8]	薛慧君,申向东,刘倩,等.高寒灌区风沙吹蚀对农业水利工程混凝土抗冻耐久性的影响[J].农业工程学报,2017,33(15):133-140.
[9]	LI Y, ZHANG H, LIU G, et al. Multi-scale study on mechanical property and strength prediction of aeolian sand concrete[J]. Construction and Building Materials, 2020,247.DOI: 10.1016/j.conbuildmat.2020.118538.
[10]	DONG W, SHEN X, XUE H, et al. Research on the freeze-thaw cyclic test and damage model of aeolian sand lightweight aggregate concrete[J]. Construction and Building Materials, 2016, 123:792-799.
[11]	DOMAGATA L. The influence of porous aggregate on microstructure of the interfacial transition zone in lightweight concrete[J]. Cement Wapno Beton, 2011,16(2):101.
[12]	KORAT L, DUCMAN V, LEGAT A, et al. Characterisation of the pore-forming process in lightweight aggregate based on silica sludge by means of X-ray micro-tomography (micro-CT) and mercury intrusion porosimetry (MIP)[J]. Ceramics International, 2013, 39(6):6997-7005.
[13]	刘倩,申向东,薛慧君,等.氯盐侵蚀和干湿循环条件下浮石混凝土的耐久性[J].农业工程学报,2018,34(21):137-143.
[14]	王仁远,申向东,薛慧君,等.浮石混凝土风沙吹蚀与冻融耦合的破坏机理研究[J].应用基础与工程科学学报, 2019,27(2):418-429.
[15]	WANG X, SHEN X, WANG H, et al.Nuclear magnetic resonance analysis of freeze-thaw damage in natural pumice concrete[J].Materiales De Construcción, 2016, 66:322.
[16]	KAMSEU E, PONZONI C, TIPPAYASAM C, et al. Influence of fine aggregates on the microstructure, porosity and chemico-mechanical stability of inorganic polymer concretes[J]. Construction and Building Materials, 2015, 96:473-483.
[17]	中华人民共和国建设部.普通混凝土长期性能和耐久性能试验方法标准:GB/T 50082-2009[S].北京:中国建筑工业出版社,2010.
[18]	WANG X, SHEN X, WANG H, et al. Nuclear magnetic resonance analysis of concrete-lined channel freeze-thaw damage[J]. Journal of the Ceramic Society of Japan, 2015, 123(1):43-51.
[19]	李杰林,周科平,张亚民,等.基于核磁共振技术的岩石孔隙结构冻融损伤试验研究[J].岩石力学与工程学报, 2012,31(6):1208-1214.
[20]	周华,李英亮,高峰,等.低场单边核磁对砖石材料加固效果的评价[J].建筑材料学报,2013,16(6):1097-1102.
[21]	YAMAN I O, HEARN N, AKTAN H M. Active and non-active porosity in concrete:part I:experimental evidence[J]. Materials and Structures, 2002,35(3):102-109.
[22]	郭耀华,丁红岩,张浦阳,等.基于压汞试验的SAP混凝土孔结构特征[J].建筑材料学报,2018,21(1):138-142.
[23]	吴国铭,李熙喆,高树生,等.基于分形理论探究碳酸盐岩CT图像二值化最佳阈值[J].石油地球物理勘探, 2017,52(5):1025-1032 ,881.
[24]	毛灵涛,连秀云,郝丽娜.基于数字体图像三维裂隙的分形计算及应用[J].中国矿业大学学报,2014,43(6):113-1139.