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(內(nèi)蒙古農(nóng)業(yè)大學水利與土木建筑工程學院, 呼和浩特 010018)
摘要: 為了研究風積沙對不同種類引氣混凝土強度和孔結構的影響,利用風積沙替代部分河砂作為混凝土細骨料,并采用皂苷和烷基兩種引氣劑配制風積沙引氣混凝土,從抗壓強度、劈裂抗拉強度與核磁共振孔結構等方面分析風積沙摻量對引氣混凝土強度及孔結構的影響,利用分形理論對不同風積沙摻量下引氣混凝土孔結構分形維數(shù)進行分析. 研究結果表明:摻入適量風積沙可以提高引氣混凝土的強度,風積沙引氣混凝土能夠滿足 C25 強度設計要求;風積沙引氣混凝土核磁共振 T2 譜呈現(xiàn)明顯“三峰”結構,且風積沙引氣混凝土核磁共振孔結構具有一定分形特征,其孔結構分形維數(shù)具有分段性. 該研究可為風積沙引氣混凝土強度及孔結構發(fā)展規(guī)律提供數(shù)據(jù)支撐.
關鍵詞: 風積沙混凝土; 皂苷引氣劑; 烷基引氣劑; 抗壓強度; 劈裂抗拉強度; 孔結構; 分形維數(shù)
中圖分類號:TU528 文獻標志碼:A 文章編號:1002?848X(2022)08?0112?06
DOI:10. 19701 / j.jzjg.LS210181
Influence of aeolian sand on strength and pore structure of air?entrained concrete
XUE Huijun, ZHENG Jianting, ZOU Chunxia, LI Hao
(College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China)
Abstract: In order to study the influence of aeolian sand on the strength and pore structure of different types ofair?entrained concrete, aeolian sand was used to replace part of river sand as concrete fine aggregate, and aeolian sandair?entrained concrete was prepared with saponins and alkyl air?entraining agents, and the influence of aeolian sand contenton the strength and pore structure of air?entrained concrete were analyzed from the aspects of compressive strength, splittensile strength and nuclear magnetic resonance pore structure. Fractal dimension of air?entrained concrete pore structureunder different aeolian sand content was analyzed by fractal theory. The study results show that mixing a proper amount ofaeolian sand can increase the strength of air?entrained concrete. Aeolian sand air?entrained concrete can meet the C25strength design requirements. The nuclear magnetic resonance T2spectrum of aeolian sand air?entrained concrete presentsan obvious " three peaks" structure, and the nuclear magnetic resonance pore structure of aeolian sand air?entrainedconcrete has certain fractal characteristics, and nuclear magnetic resonance fractal dimension is segmented. The study canprovide data support for the strength characteristics and pore structure development law of aeolian sand air?entrainedconcrete.
Keywords:aeolian sand concrete; saponin air?entraining agent; alkyl air?entraining agent; compressive strength; splittensile strength; pore structure; fractal dimension
∗內(nèi)蒙古自然科學基金項目(2020BS05008),內(nèi)蒙古科技重大專項項目(2021ZD0007),內(nèi)蒙古農(nóng)業(yè)大學引進人才科研啟動項目(NDYB2018-40).
第一作者:薛慧君,博士,講師,主要從事新型混凝土材料與結構研究,Email:xuehuijun@ yeah.net.
[引用本文] 薛慧君,鄭建庭,鄒春霞,等. 風積沙對引氣混凝土強度及孔結構的影響[J]. 建筑結構,2022,52(8):112?117. XUE Huijun, ZHENG Jianting, ZOU Chunxia, et al. Influence of aeolian sand on strength and pore structure ofair?entrained concrete[J]. Building Structure,2022,52(8):112?117.
