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(西安科技大學(xué)地質(zhì)與環(huán)境學(xué)院, 西安 710054)

摘要: 使用破碎、篩分后的廢棄石屑代替石英砂作為骨料制備超高性能混凝土(UHPC). 基于單因素分析試驗(yàn),研究了各因素(水膠比、膠集比、減水劑摻量、鋼纖維摻量)對(duì)石屑 UHPC 抗壓強(qiáng)度、抗折強(qiáng)度及流動(dòng)度的影響規(guī)律,考查了四種不同養(yǎng)生方式下石屑 UHPC 力學(xué)性能的變化. 結(jié)果表明,當(dāng)膠集比、水膠比、減水劑摻量、鋼纖維摻量分別為 0. 63、0. 2、2. 1%和 1. 5%時(shí),石屑 UHPC 的力學(xué)性能和工作性能最優(yōu),7d 抗壓強(qiáng)度最高為 113. 7MPa,抗折強(qiáng)度為 35. 2MPa;分析應(yīng)力-應(yīng)變曲線發(fā)現(xiàn),摻加鋼纖維不僅可以提高石屑 UHPC 的力學(xué)強(qiáng)度,還能顯著提高石屑UHPC 的韌性和殘余抗壓強(qiáng)度;經(jīng)過水浴養(yǎng)護(hù)、干熱養(yǎng)護(hù)和水浴+干熱組合養(yǎng)護(hù)后,石屑 UHPC 的抗壓強(qiáng)度分別提高了 5. 7%、27. 1%和 40. 3%,但熱養(yǎng)護(hù)對(duì)抗折強(qiáng)度影響不大.

關(guān)鍵詞: 超高性能混凝土; 石屑; 力學(xué)強(qiáng)度; 流動(dòng)度; 養(yǎng)生方式

中圖分類號(hào):TU528. 31 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):1002-848X(2023)05-0058-05

DOI:10. 19701 / j. jzjg. 20201434

Experimental study on mechanical properties of UHPC prepared by stone chips

ZHAI Xueqiang, LI Xiaojun

(College of Geology and Environment, Xi??an University of Science and Technology, Xi??an 710054, China)

Abstract: Use sieved granite chips to completely replace quartz sand as aggregate to prepare ultra high performance concrete(UHPC). Based on the single factor analysis test, the influence of various factors ( binder-aggregate ratio, water-binderratio, water reducing agent content, steel fiber content) on the stone chip UHPC compressive strength, flexural strength andliquidity was studied, and examined the changes in the mechanical properties of stone chip UHPC under four different curingmethods were presented. The results show that when the binder-aggregate ratio, water-binder ratio, water reducing agentcontent, and steel fiber content are 0. 63, 0. 2, 2. 1% and 1. 5% respectively, the mechanical properties and workingperformance of stone chip UHPC are best, the 7d compressive strength is 113. 7MPa, and the flexural strength is 35. 2MPa.Analysis of the stress-strain curve found that the addition of steel fiber can not only improve the mechanical strength of stonechip UHPC, but also significantly improve the toughness and residual compressive strength of stone chip UHPC. After waterbath curing, dry heat curing and water bath + dry heat curing, the compressive strength of stone chip UHPC increased by5. 7%, 27. 1% and 40. 3% respectively, but thermal curing have little effect on the flexural strength.

Keywords:ultra high performance concrete; stone chip; mechanical strength; liquidity; curing method

∗陜西省土地工程建設(shè)集團(tuán)科研項(xiàng)目(DJNY2019-10).

第一作者:翟雪強(qiáng),碩士,主要從事固廢再生利用研究,Email:1944116417@ qq. com.

[引用本文] 翟雪強(qiáng),李曉軍. 石屑制備超高性能混凝土力學(xué)性能試驗(yàn)研究[ J]. 建筑結(jié)構(gòu),2023,53( 5):58-62.ZHAI Xueqiang,LI Xiaojun. Experimental study on mechanical properties of UHPC prepared by stone chips[J]. BuildingStructure,2023,53(5):58-62.