Mechanical characterization of thermal activated low-carbon recycled cement mortars

被引:95
作者
Bogas, J. A. [1 ]
Carrico, A. [1 ]
Pereira, M. F. C. [2 ]
机构
[1] Univ Lisbon, Inst Super Tecn, DECivil, CERIS ICIST, Ave Rovisco Pais, P-1049001 Lisbon, Portugal
[2] Univ Lisbon, Inst Super Tecn, CERENA, Ave Rovisco Pais 1, P-1049001 Lisbon, Portugal
关键词
Recycled cement; Recycled concrete; Cement rehydration; Mortars with recycled cement; Mechanical characterization; HYDRATED CEMENT; CONCRETE; DURABILITY; TEMPERATURE; DEHYDRATION; REDUCTION; EMISSIONS; STRENGTH;
D O I
10.1016/j.jclepro.2019.01.325
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
In this study, low-carbon recycled cement (RC) was produced from thermally activated concrete and cement paste wastes and its incorporation in mortars, as cement replacement, was investigated. The calcination temperatures were defined based on thermogravimetric and X-ray diffraction analysis. Mortars were characterized in terms of their main fresh and mechanical properties (compressive and flexural strength, ultrasonic pulse velocity and dynamic modulus of elasticity). The influence of RC replacement ratio (20%, 50%, 75% and 100%), RC treatment temperature and RC fineness were analyzed. In all tested properties, RC from concrete waste showed significant lower efficiency than that from cement paste waste. The RC rehydration capacity was improved by increasing its fineness and preheating temperature. Mortars produced with 100% of 650 degrees C pre-heated RC were able to attain as high as 8.3 MPa of compressive strength at 28 days, corresponding to about 20% of that found in reference mortars without RC. In addition, mechanical properties were little affected by RC replacement ratios up to 20%. This study shows the efficient rehydration capacity of thermal activated RC and suggests its high potential for the construction industry. (C) 2019 Elsevier Ltd. All rights reserved.
引用
收藏
页码:377 / 389
页数:13
相关论文
共 35 条
[1]   The use of thermal analysis in assessing the effect of temperature on a cement paste [J].
Alarcon-Ruiz, L ;
Platret, G ;
Massieu, E ;
Ehrlacher, A .
CEMENT AND CONCRETE RESEARCH, 2005, 35 (03) :609-613
[2]   Freeze-thaw resistance of concrete produced with fine recycled concrete aggregates [J].
Alexandre Bogas, J. ;
de Brito, J. ;
Ramos, Duarte .
JOURNAL OF CLEANER PRODUCTION, 2016, 115 :294-306
[3]   Compressive strength evaluation of structural lightweight concrete by non-destructive ultrasonic pulse velocity method [J].
Alexandre Bogas, J. ;
Gloria Gomes, M. ;
Gomes, Augusto .
ULTRASONICS, 2013, 53 (05) :962-972
[4]   Dehydration and rehydration processes of cement paste exposed to high temperature environments [J].
Alonso, C ;
Fernandez, L .
JOURNAL OF MATERIALS SCIENCE, 2004, 39 (09) :3015-3024
[5]  
[Anonymous], 2008, CHEM WORLD UK
[6]  
[Anonymous], 2021, 125044 TS EN
[7]  
[Anonymous], 2006, 10156 BS EN
[8]  
[Anonymous], 2016, 19632016 EN
[9]  
[Anonymous], 2010, SENCOND INT C SUSTAI
[10]  
[Anonymous], 2016, 4591 CEN