The Effect of Curing Conditions on Selected Properties of Recycled Aggregate Concrete

Applied Sciences

WaheedAdewale Rasaq¹  AnnaM. Grabiec²  Daniel Zawal² 

[1] Aqua Stone, 60-002 Poznań, Poland;Institute of Construction and Geoengineering, Poznań University of Life Science, 60-649 Poznań, Poland;

关键词: curing conditions;    carbonated recycled concrete aggregate;    eco-efficiency indexes;    eco-efficient index;   

DOI  :  10.3390/app10134441

来源: DOAJ

【 摘 要 】

The paper presents the influence of different curing conditions—wet, dry, and protection against water evaporation (PEV)—on selected properties of concretes with different amounts of recycled concrete aggregate (RCA) previously subjected to atmospheric CO₂ sequestration. Two types of cement were used, Portland cement and blast-furnace slag cement. The study was performed in laboratory conditions (at the temperature of 20 ± 1 °C and relative humidity of about 60%), according to currently applicable test procedures for most of the measured characteristics of concrete. Additionally, the eco-efficiency indexes (b_i and c_i) as well as the eco-durability S-CO₂ index were calculated. It was found that dry conditions cause the properties of concrete to deteriorate, especially concrete made of blast-furnace slag cement, while PEV allows the achievement of results comparable to wet conditions. Moreover, for series with the highest amounts of coarse recycled aggregate and after longer periods of curing, the difference between the effects of wet curing and protection against water evaporation disappears. The eco-efficiency and eco-durability indexes approach confirms the beneficial effect of blast-furnace slag cement used as a binder, but on the condition of using a proper way of curing.

【 授权许可】

Unknown