Study on High-degree Recycled Aggregate for Concrete

混凝土用高等级再生骨料的研究

• 批准号: 13650639
• 负责人: KASAMI Hideo
• 金额: $ 1.98万
• 依托单位: Kogakuin University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650639/
• 关键词: recycled aggregate; heating & grinding method; oven dry specific gravity; water absorption; concrete; self-compacting concrete; strength; durability; コンクリート; 絶乾密度; 静弾性係数; 乾燥収縮; 中性化; 凍結融解; 高品質再生骨材; 副産微粉; 調合

This report presents the results of series of studies conducted to determine the quality of high degree recycled aggregate made with heating & grinding method and its effects on normal and self-compacting concrete.High-degree recycled aggregates, made with heating and grinding method and free of adhered mortar on aggregate particles, satisfied the requirements for normal aggregates of Japanese Architectural Standard Specification JASS 5 for Reinforced Concrete work. Recycled aggregates, made with mechanical grinding method did not meet with the requirement of JASS 5 for normal aggregate, oven dry specific gravity being less than 2.4g/cm^3 and water absorption being higher than 4.0%due to adhered mortar, which causes deteriorating effects on drying shrinkage and durability of concrete. The allowable maximum value of adhered mortar content was found to be 15% for the specified oven dry specific gravity of 2.5g/cm^3 and water absorption of 3.0%. Concrete containing high-degree recycled ag … More gregates with higher percentage of solid volume as much as river gravel has the equivalent strength and durability as those with crushed stone. And water content and drying shrinkage were lower and modulus of elasticity of concrete was higher than those of crushed stone concrete. High-degree recycled aggregate was found to be applicable for self-compacting concrete, with higher fluidity, lower binder content, lower dosage of super-plasicizer, lower drying shrinkage and higher modulus of elasticity than those of crushed stone concrete. By-product powder with the fineness of 400m^2/kg generated in the process of heating & and grinding can be applicable as additives for self-compacting concrete without significant adverce effects on concrete quality.Series of experimental studies were carried out to determine the properties of concrete containing high quality recycled aggregates on normal concrete and super-plasticized high-performance concrete. High quality recycled aggregate concretes showed lower water content than those with crushed stone of the same slump. Compressive strengths were equivalent to those with river gravel of the same water cement ratio and were 10% lower than those with crushed stone. Tensile strengths and moduli of elasticity were higher and drying shrinkage were lower than those with crushed stone. Less

本文介绍了一系列研究的结果，以确定高度再生骨料的质量与热磨法制成的普通和自密实混凝土的影响。高度再生骨料，采用加热研磨法制成，骨料颗粒上无粘结砂浆，满足日本建筑标准规范JASS 5钢筋混凝土工程标准骨料要求。机械研磨法制成的再生骨料不符合JASS 5对普通骨料的要求，由于粘结砂浆的存在，烘箱干燥比重小于2.4g/cm^3，吸水率大于4.0%，对混凝土的干燥收缩和耐久性有恶化的影响。在规定的烘箱干比重为2.5g/cm^3，吸水率为3.0%的条件下，粘结砂浆含量允许最大值为15%。含高回收度粉煤灰的混凝土，其强度和耐久性与含碎石的混凝土相当。混凝土含水率和干收缩率低于碎石混凝土，弹性模量高于碎石混凝土。高度再生骨料适用于自密实混凝土，比碎石混凝土具有更高的流动性、更低的粘结剂含量、更低的超塑剂用量、更低的干缩率和更高的弹性模量。在加热和研磨过程中产生的细度为400m^2/kg的副产粉末可作为自密实混凝土的添加剂，对混凝土质量没有明显的不利影响。通过对含优质再生骨料混凝土在普通混凝土和超塑高性能混凝土上的性能进行了一系列试验研究。高质量再生骨料混凝土的含水率低于相同坍落度的碎石混凝土。抗压强度与水灰比相同的河卵石相当，比碎石低10%。其抗拉强度和弹性模量均高于碎石材料，干燥收缩率低于碎石材料。少

项目成果

嵩 英雄, 阿部 道彦: "リサイクル材料の建築材料への適用に関する研究"工学院大学総合研究所地震防災・環境研究センター(EEC)研究成果報告書. No.1. 58-63 (2003)

高志英夫、阿部道彦：《再生材料在建筑材料中的应用研究》工学院大学研究所地震防灾与环境研究中心（EEC）研究成果报告第1. 58-63号（2003年）。

T.Tamai, H.Quan, H.Watanabe, H.kasami: "On the Manufacturing Methods and the Quality of Recycled Aggregates"Proceedings of Combined Convention on Materials, Japan Science Council (in Japanese). Vol.47. 267-268 (2003)

T.Tamai、H.Quan、H.Watanabe、H.kasami：“关于再生骨料的制造方法和质量”材料联合公约会议记录，日本科学理事会（日语）。

H.Quan, H.Kasami: "Experimental Study on the Application of High-degree Recycled Aggregate by Heating and Grinding Method for Self-compacting High-performance Concrete"High-strength and High-performance Concrete & Its Application (Civil Engineering Societ

H.Quan、H.Kasami：《高度再生骨料加热研磨法应用于自密实高性能混凝土的试验研究》高强高性能混凝土

倉石武, 友澤史紀, 嵩英雄, 小栗第一郎, 大西一彦: "高品質再生骨材の製造技術に関する開発 [VI] その1 開発の全体概要及び再生骨材試験"2002年度大会(北陸) 学術講演梗概集 A-1 材料施工. 1021-1022 (2002)

Takeshi Kuraishi、Fuminori Tomozawa、Hideo Take、Ichiro Oguri、Kazuhiko Onishi：“高质量再生骨料制造技术的开发[VI]第1部分开发和再生骨料测试的总体概述”2002年会议（北陆）学术讲座摘要A- 1 材料建设。1021-1022（2002）

立屋敷 久志, 嵩 英雄, 杉山 成明, 梅宮 博貴, 浅野 研一, 山崎 実: "各種のセメントを用いた高強度コンクリートから回収した高度化処理再生骨材の諸性質(その1 加熱すりもみ法による再生骨材の諸性質)"建築学会大会学術講演梗概集,A-1. (口頭論文). 777-778 (2001)

Hisashi Tateyashiki、Hideo Take、Shigeaki Sugiyama、Hirotaka Umemiya、Kenichi Asano、Minoru Yamazaki：“使用各种水泥从高强度混凝土中回收的高级处理再生骨料的性能（第 1 部分）（再生骨料的性能）”日本建筑学会会议学术讲座摘要，A-1（口头论文）。