Long-term deformation behaviour of recycled aggregate concrete

Sixteen full-scale recycled aggregate concrete (RAC) beams were cast and tested to study their time-dependent behavior under long-term loading. The test parameters include the replacement rate of the recycled coarse aggregates (RCAs), the replacement rate of the recycled fine aggregates (RFAs), the concrete strength, and the stress ratio. The influence of the above variables on the deflection and stiffness is discussed. The results show that the RCAs will increase the deflection of the specimen at a low stress ratio; at a high stress ratio, the beams will experience nonlinear creep, and the deflection of the specimen will be affected by the RCAs and the stress ratio. The RFAs have a substantial influence on the time-dependent behavior of the specimen, and the deflection of the specimen with 100% replacement of recycled aggregates can increase by 30%; the strength of the concrete does not have a substantial influence on the time-dependent behavior of the specimen; and the stress ratio has an influence on the initial deflection of the specimen. A deflection calculation formula is established based on the stress–strain relationship of the beam under long-term loading and the characteristics of the RAC. The calculation results are in good agreement with the test results.

Download Full-text

Long-term mechanical and durability properties of recycled aggregate concrete prepared with the incorporation of fly ash

Cement and Concrete Composites ◽

10.1016/j.cemconcomp.2012.12.011 ◽

2013 ◽

Vol 37 ◽

pp. 12-19 ◽

Cited By ~ 172

Author(s):

Shi-Cong Kou ◽

Chi-Sun Poon

Keyword(s):

Fly Ash ◽

Recycled Aggregate Concrete ◽

Recycled Aggregate ◽

Aggregate Concrete ◽

Durability Properties

Download Full-text

The State-of-the-Art Study on Long-Term Property of Recycled Aggregate Concrete

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.517.522 ◽

2012 ◽

Vol 517 ◽

pp. 522-527 ◽

Cited By ~ 1

Author(s):

Jian Zhuang Xiao ◽

Hong Li

Keyword(s):

State Of The Art ◽

Fatigue Behavior ◽

Recycled Aggregate Concrete ◽

Recycled Aggregate ◽

Recycled Aggregates ◽

Comprehensive Understanding ◽

Normal Concrete ◽

Aggregate Concrete ◽

Mix Proportion

This paper presents a review of the literature on long-term property of recycled aggregate concrete (RAC), which includes the long-term strength, shrinkage, creep, durability and fatigue behavior. Based on many investigations carried out at home and abroad, it can be apparently observed that there are many differences in long-term property between the normal concrete and the RAC. However the long-term property of RAC can be improved and guaranteed by selecting the recycled aggregates replacement percentage, optimizing the mix proportion design, appending fiber or to restrict the environmental conditions. This paper can be helpful to the comprehensive understanding and further research of recycled aggregate concrete.

Download Full-text