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(1 同濟(jì)大學(xué)土木工程學(xué)院, 上海 200092; 2 廣西大學(xué)土木建筑工程學(xué)院, 南寧 530004)

摘要: 石粉含量對(duì)機(jī)制砂混凝土的性能有較大的影響. 對(duì)不同石粉含量的機(jī)制砂混凝土梁開(kāi)展受彎試驗(yàn),對(duì)比研究了不同石粉含量機(jī)制砂混凝土梁和天然砂混凝土梁受彎破壞形式、極限荷載、鋼筋和混凝土應(yīng)變以及梁跨中撓度等. 結(jié)果表明,機(jī)制砂混凝土的抗壓強(qiáng)度和彈性模量隨石粉含量的增加先增大再減小,當(dāng)石粉含量范圍在 5% ~ 15%時(shí),機(jī)制砂混凝土的抗壓強(qiáng)度和彈性模量?jī)?yōu)于天然砂混凝土. 與天然砂混凝土梁相比,石粉含量為 5%和 10%的機(jī)制砂混凝土梁受彎極限承載力分別提高了 50%和 52%,開(kāi)裂荷載分別增加了 70%和 75%,當(dāng)石粉含量為 10%時(shí),試驗(yàn)梁極限荷載最大. 合適的石粉含量對(duì)機(jī)制砂混凝土梁受彎性能的提升有較好的促進(jìn)作用,建議石粉含量取為 5%~10%.

關(guān)鍵詞: 機(jī)制砂; 石粉; 混凝土梁; 受彎性能; 破壞模式

中圖分類(lèi)號(hào):TU528 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):1002-848X(2023)12-0074-06

DOI:10. 19701 / j. jzjg. 20211543

Experimental study and analysis on flexural behavior of concrete beams with manufactured sand

BAI Meiyan1,2, WU Yuching1, XIAO Jianzhuang1, XIE Kaizhong2

(1 College of Civil Engineering, Tongji University, Shanghai 200092, China; 2 College of Civil Engineeringand Architecture, Guangxi University, Nanning 530004, China)

Abstract: The stone powder content has a great influence on the performance of manufactured sand concrete. The bendingtests of manufactured sand concrete beams with different stone powder content were carried out, the bending failure forms ofmanufactured sand concrete beams with different stone powder content and natural sand concrete beams, the ultimate load,strain and deflection of reinforcement and concrete, and mid span deflection were studied. The results show that thecompressive strength and elastic modulus of manufactured sand concrete first increase and then decrease with the increase ofstone powder content. When the stone powder content ranges from 5% to 15%, the compressive strength and elasticmodulus of manufactured sand concrete are better than natural sand concrete. Compared with natural sand concrete beams,the ultimate bearing capacity of manufactured sand concrete beams with stone powder content of 5% and 10% is increasedby 50% and 52% respectively, and the cracking load is increased by 70% and 75% respectively. When the stone powdercontent is 10%, the ultimate load of the test beam is the largest. The appropriate content of stone powder can promote theimprovement of flexural performance of manufactured sand concrete beams, and it is suggested that the content of stonepowder should be 5% to 10%.

Keywords:manufactured sand; stone powder; concrete beam; flexural performance; failure mode

∗國(guó)家自然科學(xué)基金項(xiàng)目(51868007,51368005).

第一作者:柏美巖,碩士,主要從事新型混凝土材料及廢棄物資源化,Email: baimeiyan@ # edu.

[引用本文] 柏美巖,吳宇清,肖建莊,等. 機(jī)制砂混凝土梁受彎性能試驗(yàn)研究與分析[ J]. 建筑結(jié)構(gòu),2023,53(12):74-79. BAI Meiyan,WU Yuching,XIAO Jianzhuang,et al. Experimental study and analysis on flexural behavior ofconcrete beams with manufactured sand[J]. Building Structure,2023,53(12):74-79.