預(yù)拌混凝土各齡期抗拉和抗壓強(qiáng)度換算關(guān)系試驗(yàn)研究
陳萌1,劉立新1,彭少民2
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(1 鄭州大學(xué)土木工程學(xué)院,鄭州 450002; 2 武漢理工大學(xué),武漢 430070)[摘要]對225個(gè)混凝土試件分別進(jìn)行了5個(gè)齡期的立方體抗壓強(qiáng)度、劈裂抗拉強(qiáng)度和軸心抗拉強(qiáng)度試驗(yàn)研究。在試驗(yàn)數(shù)據(jù)基礎(chǔ)上,回歸了60d齡期內(nèi)各個(gè)齡期混凝土的立方體抗壓強(qiáng)度與劈裂抗拉強(qiáng)度、軸心抗拉強(qiáng)度以及劈裂抗拉強(qiáng)度與軸心抗拉強(qiáng)度之間的換算公式,公式計(jì)算結(jié)果與試驗(yàn)結(jié)果符合良好,可為防止和控制混凝土結(jié)構(gòu)早期收縮裂縫提供重要強(qiáng)度指標(biāo)。試驗(yàn)數(shù)據(jù)可為混凝土規(guī)范中有關(guān)耐久性條目修訂提供參考。[關(guān)鍵詞]預(yù)拌混凝土;軸心抗拉強(qiáng)度;立方體抗壓強(qiáng)度;換算關(guān)系Experimental study on relationships between tensile strength and compressive strength of readymixed concrete at different ageChen Meng1, Liu Lixin1, Peng Shaomin2(1 School of Civil Engineering,Zhengzhou University,Zhengzhou 450002,China; 2 Wuhan University of Technology,Wuhan 430070,China)Abstract:Experimental study on strength indexes is studied. Based on the experimental results, the conversion formulas(between the compressive strength and the splitting tensile strength, between the compressive and the axial tensile strength,between the splitting tensile strength and the axial tensile strength) at different ages in 60-day are received. The calculation results of the formulas are well identical with the experimental results.The above formulas can supply data and material to the code.Keywords:ready-mixed concrete; axial tensile strength; axial compressive strength; conversion relationships*河南省高等學(xué)校青年骨干教師項(xiàng)目資助。作者簡介:陳萌,副教授,Email:cmhlx@zzu.edu.cn。參考文獻(xiàn)[1]ARSHAD A KHAN,WILLIAM D COOK,DENIS MITHELL.Early age compressive stress-strain properties of low,medium,and high-strength concretes[J].ACI Material Journal,1995(3-4):617-624.[2]張勇強(qiáng),林皋,閻東明.混凝土早期強(qiáng)度的試驗(yàn)研究[J].沈陽建筑工程學(xué)院學(xué)報(bào),2003,(4):85-89.[3]陳萌.混凝土結(jié)構(gòu)收縮裂縫的機(jī)理分析與控制[D].武漢:武漢理工大學(xué),2006.
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