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周志威，王杰，余中華，劉佳欣， 肖東

（ 成都城投城建科技有限公司 ， 四川成都 610500)

摘 要：為有效降低超高性能混凝土 (UHPC) 中鋼纖維的使用成本，采用混摻不同長(zhǎng)度鋼纖維方式，對(duì)UHPC的基本工作性能和力學(xué)性能進(jìn)行對(duì)比研究。結(jié)果表明：鋼纖維長(zhǎng)度對(duì)UHPC擴(kuò)展度有一定影響，總體上長(zhǎng)纖維混摻組的擴(kuò)展度小于短纖維混摻組，鋼纖維摻量比鋼纖維長(zhǎng)度對(duì)擴(kuò)展度的影響更大；熱水養(yǎng)護(hù)可以促進(jìn)UHPC 中氫氧化鈣迅速反應(yīng)生成強(qiáng)度更高的 C - S- H 凝膠物質(zhì)，熱水養(yǎng)護(hù)3d 的UHPC力學(xué)強(qiáng)度明顯高于標(biāo)準(zhǔn)養(yǎng)護(hù)28d的力學(xué)強(qiáng)度；熱水養(yǎng)護(hù)混摻 8 、20 mm 長(zhǎng)鋼纖維的UHPC抗壓強(qiáng)度最高，混摻16 、20mm 長(zhǎng)鋼纖維的UHPC抗折強(qiáng)度最高，標(biāo)準(zhǔn)養(yǎng)護(hù)混摻16 、20mm長(zhǎng)鋼纖維的UHPC抗壓和抗折強(qiáng)度最高；通過(guò)層次分析法對(duì)UHPC綜合性能進(jìn)行計(jì)算分析，發(fā)現(xiàn)在采用13、20mm或者16 、20mm 混摻方案時(shí)，綜合性能可以超過(guò)13mm 長(zhǎng)鋼纖維單摻3%的UHPC綜合性能，通過(guò)混摻優(yōu)化可使UHPC材料生產(chǎn)成本降低600 ~ 700元/m3 。

關(guān)鍵詞：超高性能混凝土；鋼纖維長(zhǎng)度；混摻；層析分析法；綜合性能

中圖分類號(hào)：U444 

文獻(xiàn)標(biāo)志碼：A 

文章編號(hào)：1005- 8249 (2024) 03- 0030- 05 

DOI：10.19860/j.cnki.issn1005-8249.2024.03.007

ZHOU Zhiwei, WANG Jie, YU Zhonghua, LIU Jiaxin, XIAO Dong

(Chengdu Chengtou Urban Construction Technology Co. ，Ltd. ，Chengdu 610500 , China)

Abstract : In order to effectively reduce the cost of steel fibres in ultra- high performance concrete ( UHPC) , a comparative study of the basic working and mechanical properties of UHPC was carried out by mixing different lengths of steel fibres . The results show that : the length of steel fibre has a certain effect on the degree of expansion of UHPC , in general , the degree of expansion of the long fibre mixing group is smaller than that of the short fibre mixing group , and the amount of steel fibre mixing has a greater effect on the degree of expansion compared with the length of steel fibre; hot water curing can promote the rapid reaction of calcium hydroxide to generate a higher strength of the C - S- H gel substance in UHPC , and the mechanical strength of the UHPC in hot water curing for 3 d is significantly higher than that of the standard curing. The mechanical strength of UHPC in hot water conditioning for 3d is significantly higher than that of standard conditioning for 28d; the compressive strength of UHPC with 8 and 20 mm steel fibres in hot water conditioning is the highest , the flexural strength of UHPC with 16 and 20 mm steel fibres in hot water conditioning is the highest , and the compressive and flexural strengths of UHPC with 16 and 20 mm steel fibres in standard conditioning are the highest; the comprehensive performance of UHPC was calculated through the hierarchical analysis , and the calculation and analysis of UHPC performance were found to be the highest with the mixing scheme of 13 and 20 mm or 16 and 20 mm. It is found that the comprehensive performance of UHPC with 13 and 20 mm or 16 and 20 mm mixing scheme can exceed the comprehensive performance of UHPC with 13 mm long steel fibre single mixing 3% , and the optimization of mixing can reduce the production cost of UHPC material by 600 ~ 700 RMB/m3 .

Keywords : ultra high performance concrete; steel fiber length; mixing; chromatography analysis method; comprehensive performance

作者簡(jiǎn)介：周志威 (1990—) , 男，碩士，工程師，研究方向： 市政 、水利 、建筑材料相關(guān)研究工作。

通信作者： 王 杰 (1990—) , 男，本科，工程師，研究方向： 市政 、橋梁方面研究工作。

收稿日期：2023-05-30