风积沙对引气混凝土强度及孔结构的影响
引用文献：
薛慧君 郑建庭 邹春霞 李昊. 风积沙对引气混凝土强度及孔结构的影响[J]. 建筑结构，2022，48（08）：112-117.
XUE Huijun ZHENG Jianting ZOU Chunxia LI Hao. Influence of aeolian sand on strength and pore structure of air-entrained concrete[J]. Building Structure，2022,48（08）：112-117.
摘要：为了研究风积沙对不同种类引气混凝土强度和孔结构的影响，利用风积沙替代部分河砂作为混凝土细骨料，并采用皂苷和烷基两种引气剂配制风积沙引气混凝土，从抗压强度、劈裂抗拉强度与核磁共振孔结构等方面分析风积沙掺量对引气混凝土强度及孔结构的影响，利用分形理论对不同风积沙掺量下引气混凝土孔结构分形维数进行分析。研究结果表明：掺入适量风积沙可以提高引气混凝土的强度，风积沙引气混凝土能够满足C25强度设计要求；风积沙引气混凝土核磁共振T2谱呈现明显“三峰”结构，且风积沙引气混凝土核磁共振孔结构具有一定分形特征，其孔结构分形维数具有分段性。该研究可为风积沙引气混凝土强度及孔结构发展规律提供数据支撑。
关键词：风积沙混凝土，皂苷引气剂，烷基引气剂，抗压强度，劈裂抗拉强度，孔结构，分形维数
基金：内蒙古自然科学基金项目(2020BS05008)；内蒙古科技重大专项项目(2021ZD0007)；内蒙古农业大学引进人才科研启动项目(NDYB2018-40)。
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[5] CHUAH S,DUAN W,PAN Z,et al.The properties of fly ash based geopolymer mortars made with dune sand[J].Materials and Design,2016,92(12):571-578.
[6] Al-HARTHY A S,HALIM M A,TAHA R,et al.The properties of concrete made with fine dune sand[J].Construction and Building Materials,2007,21(8):1803-1808.
[7] 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,2020,247:118538.
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[9] 刘倩，申向东，董瑞鑫，等.孔隙结构对风积沙混凝土抗压强度影响规律的灰熵分析[J].农业工程学报，2019,35(10):108-114.
[10] 薛慧君，申向东，邹春霞，等.基于NMR的风积沙混凝土冻融孔隙演变研究[J].建筑材料学报，2019,22(2):199-205.
[11] 邹欲晓，申向东，李根峰，等.MgSO4-冻融循环作用下风积沙混凝土的微观孔隙研究[J].建筑材料学报，2018,21(5):817-824.
[12] 张凯，王起才，杨子江，等.多年冻土区引气混凝土抗压强度及抗冻性研究[J].铁道学报，2019,41(5):156-161.
[13] 谢剑，唐静，孙雅丹.超低温条件下引气剂对混凝土抗冻性能影响的试验研究[J].硅酸盐通报，2020,39(1):12-19.
[14] 李雪峰.气压环境对不同引气剂性能及引气混凝土气孔结构的影响[J].农业工程学报，2018,34(24):144-150.
[15] 李雪峰，付智.低气压环境对混凝土含气量及气泡稳定性的影响[J].硅酸盐学报，2015,43(8):1076-1082.
[16] 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(246):102-109.
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Influence of aeolian sand on strength and pore structure of air-entrained concrete
Abstract: In order to study the influence of aeolian sand on the strength and pore structure of different types of air-entrained concrete, aeolian sand was used to replace part of river sand as concrete fine aggregate, and aeolian sand air-entrained concrete was prepared with saponins and alkyl air-entraining agents, and the influence of aeolian sand content on the strength and pore structure of air-entrained concrete were analyzed from the aspects of compressive strength, split tensile strength and nuclear magnetic resonance pore structure. Fractal dimension of air-entrained concrete pore structure under different aeolian sand content was analyzed by fractal theory. The study results show that mixing a proper amount of aeolian sand can increase the strength of air-entrained concrete. Aeolian sand air-entrained concrete can meet the C25 strength design requirements. The nuclear magnetic resonance T2 spectrum of aeolian sand air-entrained concrete presents an obvious "three peaks" structure, and the nuclear magnetic resonance pore structure of aeolian sand air-entrained concrete has certain fractal characteristics, and nuclear magnetic resonance fractal dimension is segmented. The study can provide data support for the strength characteristics and pore structure development law of aeolian sand air-entrained concrete.
Keywords: aeolian sand concrete; saponin air-entraining agent; alkyl air-entraining agent; compressive strength; split tensile strength; pore structure; fractal dimension
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