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(1 甘肅省工程設(shè)計研究院有限責任公司, 蘭州 730030; 2 揚州大學建筑科學與工程學院, 揚州 225127;3 江蘇省裝配式建筑與智能建造工程研究中心, 宿遷 223800; 4 揚州市房屋安全鑒定中心, 揚州 225002)
摘要: 為研究水膠比、減水劑和礦物摻合料摻量對超高性能混凝土(UHPC)工作性能的影響以及水膠比、礦物摻合料和鋼纖維摻量對 UHPC 力學性能的影響,分別進行凈漿流動度試驗和 UHPC 抗折、抗壓強度試驗. 結(jié)果表明:提高水膠比和增加粉煤灰摻量可以改善漿體的流動性,但會降低 UHPC 的抗折強度和抗壓強度;增加礦渣粉摻量可以在改善漿體流動性的同時,提高 UHPC 后期的抗折強度和抗壓強度;隨著硅灰摻量的增加,漿體的流動性不斷降低,而 UHPC 的抗折強度和抗壓強度呈現(xiàn)先上升后下降的趨勢,當硅灰摻量為 25%時,UHPC 的強度達到峰值,抗折強度和抗壓強度分別提高 23. 7%和 32. 0%;鋼纖維摻量的增加會提高 UHPC 強度,當摻入 2%的鋼纖維時,UHPC 的抗折強度與抗壓強度分別提高 39. 7%和 59. 1%. 綜合考慮,建議硅灰摻量在 20% ~ 30%之內(nèi)為宜,礦渣粉摻量不超過 30%,粉煤灰摻量不超過 20%,鋼纖維摻量宜取 2%.
關(guān)鍵詞: 超高性能混凝土; 流動性; 力學性能; 抗壓強度; 抗折強度;礦物摻合料;鋼纖維
中圖分類號:TU528 文獻標志碼:A 文章編號:1002-848X(2023)02-0142-06
DOI:10. 19701 / j. jzjg. LS210329
Analysis on working and mechanical properties of ultra-high performance concrete
YAO Shan1, YANG Zhongping1, GE Wenjie2,3, HU Yuexiang4, LI Wei2,SUN Chuanzhi3, YAN Weihua2, CAO Dafu2
(1 Gansu Engineering Design Research Institute Co. , Ltd. , Lanzhou 730030, China; 2 College of Civil Scienceand Engineering, Yangzhou University, Yangzhou 225127, China; 3 Jiangsu Province Engineering Research Centerof Prefabricated Building and Intelligent Construction, Suqian 223800, China; 4 Yangzhou Housing Safety Appraisal Center,Yangzhou 225002, China)
Abstract: In order to study the effects of water-binder ratio, water reducing agent content and mineral admixture content onthe working performance of ultra-high performance concrete ( UHPC) and the influence of water-binder ratio, mineraladmixture content and steel fiber content on mechanical properties of UHPC, the fluidity test of slurry and the flexural andcompressive strength test of UHPC were carried out respectively. The results show that increasing the water-binder ratio andfly ash content can improve slurry fluidity, but reduce the flexural strength and compressive strength of UHPC. The flexuralstrength and compressive strength of UHPC in later period can be improved by increasing the content of slag powder whileimproving slurry fluidity. With the increase of silica fume content, the slurry fluidity decreases continuously, while theflexural strength and compressive strength of UHPC increase first and then decrease. When the silica fume content is 25%,the strength of UHPC reaches the peak, and the flexural strength and compressive strength are improved by 23. 7% and32. 0% respectively. The increase of steel fiber content can improve the strength of UHPC, when 2% steel fiber is added,the flexural strength and compressive strength of UHPC are improved by 39. 7% and 59. 1% respectively. Consideringcomprehensively, it is recommended that the silica fume content should be within 20% ~ 30%, the slag powder contentshould not exceed 30%, the fly ash content should not exceed 20%, and the steel fiber content should be 2%.
Keywords: ultra-high performance concrete; fluidity; mechanical property; compressive strength; flexural strength;mineral admixture; steel fiber
∗甘肅省建設(shè)科技計劃項目(JK2021-19),江蘇省自然科學基金面上項目(BK20201436),江蘇省裝配式建筑與智能建造工程研究中心開放基金( 2021),江蘇省建設(shè)系統(tǒng)科技項目( 2018ZD047、2021ZD06),揚州市市校合作資金項目( YZ2022194、YZU212105),揚州市建設(shè)科技項目(2022ZD03、202204).
第一作者:姚山,博士,高級工程師,主要從纖維混凝土結(jié)構(gòu)方向的研究,Email:yaoshan8@ 126. com.
[引用本文] 姚山,楊忠平,葛文杰,等. 超高性能混凝土工作及力學性能分析[ J]. 建筑結(jié)構(gòu),2023,53(2):142-147. YAO Shan, YANG Zhongping, GE Wenjie, et al. Analysis on working and mechanical properties of ultra-highperformance concrete[J]. Building Structure,2023,53(2):142-147.
