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趙靜怡

（ 安康學(xué)院陜南生態(tài)經(jīng)濟(jì)發(fā)展研究中心 ，陜西 安康 725000)

摘   要 ：為有效提升建筑廢料再生綠色混凝土 ( RAC)   的力學(xué)性能 ，室內(nèi)利用鋼纖維和聚丙烯纖維分別制備了鋼纖維改良 RAC 、聚丙烯纖維改良 RAC 以及鋼－聚丙烯纖維改良 RAC ,  并對三種RAC 材料開展了坍落度試驗和力學(xué)試驗。研究發(fā)現(xiàn)： (1)  素 RAC 拌合物坍落度較高 ，可以達(dá)到 168. 87 mm;  單摻或混摻鋼纖維和聚丙烯 纖維材料后RAC 拌合物的坍落度顯著降低 ，單摻 1% 鋼纖維材料的混凝土拌合物坍落度為 92. 16  mm ,  單摻 0. 8%PF 材料的 RAC 拌合物坍落度為 108. 95 mm 。 (2)  單摻鋼纖維后混凝土的承載能力明顯增強(qiáng)，而聚丙烯纖 維則會劣化RAC 試件的承載能力 ，單摻聚丙烯纖維后RAC 強(qiáng)度出現(xiàn)輕微降低 。當(dāng)鋼纖維和 PF 材料的摻量較大時，RAC 試件的立方體抗壓強(qiáng)度又出現(xiàn)了明顯的降低 。(3)  當(dāng)聚丙烯或鋼纖維摻量較低時 ，RAC 試件的抗拉強(qiáng) 度隨另一種纖維材料摻量的增大逐漸增大；而當(dāng) PF 或鋼纖維摻量較大時，RAC 試件的抗拉強(qiáng)度則會出現(xiàn)減小 的現(xiàn)象 。研究成果為我國建筑廢料的回收利用以及混凝土的改良提供了一定的借鑒作用。

      關(guān)鍵詞 ：混凝土改良 ；鋼纖維 ；聚丙烯纖維 ；再生粗骨料 ；建筑垃圾回收 ；力學(xué)試驗

      中圖分類號 ：TU528. 1           

      文獻(xiàn)標(biāo)志碼 ：A            

      文章編號 ：1005- 8249  (2023)   06- 0088- 05

DOI : 10. 19860/j . cnki . issn1005- 8249. 2023 . 06. 014

ZHAO Jingyi

( Ankang University Shaannan Eco-economy Research Center ,  Ankang 725000 ,   China)

Abstract: To effectively improve the mechanical properties of recycled green concrete (RAC) from construction waste, steel fiber modified RAC, polypropylene fiber modified RAC and steel polypropylene fiber modified RAC were prepared by using steel fiber and polypropylene fiber respectively, and slump test and mechanical test were carried out on three RAC materials. It is found that: (1) the slump of plain RAC mixture is high, which can reach 168.87 mm; The slump of RAC mixture is significantly reduced after single or mixed with steel fiber and polypropylene fiber materials. The slump of concrete mixture with 1% steel fiber materials is 92.16 mm and that of Rac mixture with 0.8% pf materials is 108.95 mm. (2) After adding steel fiber alone, the bearing capacity of concrete is significantly enhanced, while polypropylene fiber will degrade the bearing capacity of RAC specimens, and the strength of RAC decreases slightly after adding polypropylene fiber alone. When the content of steel fiber and PF material is large, the cube compressive strength of RAC specimen decreases obviously. (3) When the content of polypropylene or steel fiber is low, the tensile strength of RAC specimen increases gradually with the increase of the content of another fiber material; When the content of PF or steel fiber is large, the tensile strength of Rac specimen will decrease. The research results provide a certain reference for the recycling of construction waste and the improvement of concrete in China.

Keywords: concrete improvement, steel fiber, polypropylene fiber, recycled coarse aggregate, construction waste recycling, mechanical test

作者簡介 ：趙靜怡  (1987—) ,  女 ，碩士 ，講師 。主要研究方向 ：工程管理。

收稿日期 ：2023- 05- 1 1