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(1 內(nèi)蒙古科技大學(xué)土木工程學(xué)院， 包頭 014010; 2 中國(guó)二冶集團(tuán)有限公司， 包頭 014010;3 內(nèi)蒙古科大工程項(xiàng)目管理有限責(zé)任公司， 包頭 014010）

［摘要］生態(tài)修復(fù)再生混凝土是利用再生骨料制備的用于水中生物生態(tài)環(huán)境修復(fù)的一種大孔混凝土，具有節(jié)約資源和保護(hù)環(huán)境的雙重意義。利用再生粗骨料分別制備孔隙率為15%，20%，25%的生態(tài)修復(fù)再生混凝土試件，并利用改進(jìn)的快凍法對(duì)生態(tài)修復(fù)再生混凝土的抗凍性能進(jìn)行研究，分析不同膠凝材料用量和孔隙率對(duì)生態(tài)修復(fù)再生混凝土抗凍性能的影響。研究結(jié)果表明：在快速凍融循環(huán)條件下，生態(tài)修復(fù)再生混凝土的抗凍性隨著膠凝材料用量增加而增加，隨著孔隙率增大而減小；當(dāng)膠凝材料用量為300～400kg/m3，孔隙率小于25%時(shí)，生態(tài)修復(fù)再生混凝土抗凍性能滿足50次凍融循環(huán)要求；膠凝材料用量達(dá)到400kg/m3，孔隙率不大于15%時(shí)，生態(tài)修復(fù)再生混凝土的抗凍性可滿足75次凍融循環(huán)要求。

［關(guān)鍵詞］生態(tài)修復(fù)再生混凝土； 孔隙率； 抗凍性； 膠凝材料用量； 凍融循環(huán)； 再生粗骨料； 改進(jìn)的快凍法

中圖分類號(hào)：TU502文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2020)15-0080-05

Experimental study on anti-freezing performance of ecological restoration regenerated concrete

WANG Chenxia1, YANG Yuhao1, CAO Fubo1, CHEN Xiaojie2, ZHANG Zhanbiao3

（1 School of Civil Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China; 2 China Second Metallurgy Group Co., Ltd., Baotou 014010, China; 3 Inner Mongolia University of Science and Technology Project Management Co., Ltd., Baotou 014010, China）

Abstract:Ecological restoration regenerated concrete is a kind of macro-porous concrete which is used in the restoration of biological environment in water by using recycled coarse aggregates. It has the double meaning of saving resources and protecting the environment. The regenerated coarse aggregates were used to make ecological restoration regenerated concrete specimen with porosity 15%, 20%, and 25% respectively, and the improved quick-freezing method was used to study the anti-freezing performance of ecological restoration regenerated concrete. The influence of different amount of cementing material and porosity on the anti-freezing performance of ecological restoration regenerated concrete was analyzed. The research results show that under the conditions of rapid freeze-thaw cycles, the anti-freezing performance of ecological restoration regenerated concrete increases with the increase of the amount of cementing material and decreases with the increase of the porosity. When the amount of cementing material is 300～400kg/m3 and the porosity is not more than 25%，the anti-freezing performance of ecological restoration regenerated concrete can meet the requirements of 50 times freeze-thaw cycles; when the amount of cementing material reaches 400kg/m3 and the porosity is not more than 15%, the anti-freezing performance of ecological restoration regenerated concrete can  meet the requirements of 75 times freeze-thaw cycles.

Keywords:ecological restoration regenerated concrete; porosity; anti-freezing performance; amount of cementing material; freeze-thaw cycle; regenerated coarse aggregate; improved-quick freezing method

*國(guó)家自然科學(xué)基金項(xiàng)目(51868061），內(nèi)蒙古自然科學(xué)基金項(xiàng)目（2020MS05071）。

作者簡(jiǎn)介：王晨霞，博士，副教授，Email: wangchenxia77@qq.com; 通訊作者：曹芙波，博士，教授，Email:caofubo@139.com。