- 摘 要
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(1 遼寧工程技術大學土木與交通學院，阜新 123000；2 遼寧工程技術大學建筑工程學院，阜新 123000；3 大連大學建筑工程學院，大連 116622)
［摘要］為了研究再生粗骨料在再生混凝土中的骨架增強作用和其對再生混凝土性能的影響規(guī)律，采用試驗分析的方法，通過配制不同強度的再生混凝土，分析了再生粗骨料不同的取代率和最大粒徑對混凝土強度、坍落度、抗壓強度和抗折強度等性能的影響。結(jié)果表明：隨著再生粗骨料用量的減少，再生混凝土的抗壓強度逐漸提高，抗折強度趨于增加，且抗折強度隨著再生粗骨料最大粒徑的增大而降低，再生粗骨料的最佳粒徑為9.5mm；隨著再生粗骨料摻量的增加，再生混凝土的坍落度提高。在保持混凝土配合比中的單位用水量不變的前提下，隨著再生混凝土中水泥用量的減少，再生混凝土砂漿的強度也隨之減小。
［關鍵詞］再生粗骨料; 顆粒級配; 抗壓強度; 抗折強度; 試驗分析
中圖分類號：TU528.79 文獻標識碼：A 文章編號：1002-848X(2014)14-0017-04
Influence of recycled coarse aggregate on recycled concrete performance
Liu Shuxian1,2, Wei Xiaogang 1, Wang Wei1, Lu Shasha1, Ma Fenghai3
(1 College of Civil and Transportation Engineering, Liaoning Technical University, Fuxin 123000, China; 2 College of Architecture and Civil Engineering, Liaoning Technical University, Fuxin 123000, China; 3 College of Civil Engineering and Architecture, Dalian University, Dalian 116622, China)
Abstract: In order to study the skeleton improving activity of the recycled coarse aggregate in recycled concrete and the influencing laws of recycled coarse aggregate on the recycled concrete performance, experimental analysis method was adopted. Recycled concrete with different strength were prepared, and the influences of different replace quantity and maximum particle size of recycled coarse aggregate on concrete strength, slump, compressive strength and bending strength were studied. Results show that as the decrease of the content of the recycled coarse aggregate, the compressive strength of recycled concrete improves gradually, the bending strength of the recycled concrete tends to increase and reduces with the increase of the maximum particle size of recycled coarse aggregate. The best particle size of recycled coarse aggregates is 9.5mm. Along with the increase of the content of recycled aggregate, the slump of recycled concrete increases. Given the unit water use in concrete mixture ratio, the mortar strength decreases with the reduction of the cement content in recycled concrete.
Keywords: recycled coarse aggregate; particle gradation; compressive strength; bending strength; experimental analysis
*國家自然科學基金資助(51174038)，遼寧省教育廳科學技術研究項目（L2012111），中國煤炭工業(yè)協(xié)會科研項目（MTKJ2012-319），遼寧工程技術大學市場調(diào)研信息立項基金（SCDY2012010）。
作者簡介：劉書賢，教授，博士生導師，Email:zzxmwxg@163.com。
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