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史陽光^1 , 3 , 高    峰^1 ,2  ,  劉     磊 ^1 ,2

( 1. 伊犁師范大學 物理科學與技術學院； 2. 新疆凝聚態相變與微結構實驗室 ，新疆 伊寧 835000;

3. 新疆農業大學 水利與土木工程學院 ，新疆 烏魯木齊 830052)

摘   要： 為研究聚丙烯纖維對輕骨料混凝土力學性能和工作性能的影響 ，通過摻加體積分數 0、0. 1%、 0. 15% 、0. 2% 、0. 25% 、0. 3%的聚丙烯纖維開展劈拉強度 、坍落度的試驗研究 。探討劈拉強度 、坍落度在不同纖維摻量下的變化規律，利用細觀掃描成像分析劈拉試件破壞機理和流動性的變化原因，并通過能量耗散分析纖維對混凝土各階段的耗能能力。結果表明：隨著纖維摻量的增加，坍落度持續降低； 劈拉強度先增大后減小變化，且劈拉強度值均高于對照組，當纖維摻量0. 25%時 ，劈拉強度增長率最大為27. 3% ; 細觀分析表明聚丙烯纖維起到了橋接作用 ，改變了試件的破壞形態，增強了混凝土韌性。能量耗散結果表明纖維提高了輕骨料混  凝土的耗能能力，減弱了卸載階段承載力的衰減程度。

關鍵詞： 坍落度； 劈拉強度； 聚丙烯纖維； 能量耗散； 細觀分析

中圖分類號： TU528      

文獻標志碼： A      

文章編號： 1005-8249 (2023) 06-0116-06

DOI : 10. 19860/j.cnki.issn1005-8249.2023.06.019

SHI Yangguang^1 , 3 , GAO Feng^1 , 2 , LIU Lei^1 , 2

( 1. Yili Normal University College of Physical Science and Technology;

2. Xinjiang Condensed Matter Phase Transition and Microstructure Laboratory , Yining 835000 , China;

3. College of Hydraulic and Civil Engineering , Xinjiang Agricultural University , Urumqi 830052 ,  China)  

Abstract: In order to study the influence of polypropylene fiber on the mechanical properties and working properties of light aggregate concrete, experimental studies on the tensile strength and collapse degree of polypropylene fiber were carried out by adding polypropylene fiber with volume fractions of 0%, 0.1%, 0.15%, 0.25% and 0.3%. The variation of splitting strength and collapse degree under different fiber dosage was discussed, the causes of the failure mechanism and fluidity of the splitting specimen were analyzed by mesoscopic scanning, and the energy consumption capacity of the fibers at various stages of concrete was analyzed by energy dissipation. The results show that with the increase of fiber dosage, the collapse degree continues to decrease. The tensile strength increased first and then decreased, and the tensile strength value was higher than that of the control group, and when the fiber dosage was 0.25%, the maximum growth rate of the cleavage strength was 27.3%; The mesoscopic analysis showed that the polypropylene fiber played a bridging role, changed the failure form of the specimen, and enhanced the toughness of the concrete. The energy dissipation results show that the fiber improves the energy consumption capacity of light aggregate concrete and weakens the attenuation degree of bearing capacity during the unloading stage.

Keywords: slump; tensile strength; polypropylene fiber; energy dissipation; detailed analysis

?基金項目： 新疆維吾爾自治區自然科學基金資助項目  (2022D01 C339) ; 伊犁師范大學校級科研項目  ( 2021 YSYB105) ; 新疆維 吾爾自治區高校科研計劃項目  ( XJEDU2022P095) 。

作者簡介： 史陽光  (1990—) , 男 ，博士研究生 ，講師 ，主要從事混凝土材料的研究。

收稿日期： 2023-10-12