Stress–strain relationship analysis of recycled aggregate concrete based on orthogonal analysis

The addition of macro-polypropylene fibres improves the stress-strain performance of natural aggregate concrete (NAC). However, limited studies focus on the stress-strain performance of macro-polypropylene fibre-reinforced recycled aggregate concrete (RAC). Considering the variability of coarse recycled aggregates (CRA), more studies are needed to investigate the stress-strain performance of macro-polypropylene fibre-reinforced RAC. In this study, a new type of 48 mm long BarChip macro-polypropylene fibre with a continuously embossed surface texture is used to produce BarChip fibre-reinforced NAC (BFNAC) and RAC (BFRAC). The stress-strain performance of BFNAC and BFRAC is studied for varying dosages of BarChip fibres. Results show that the increase in energy dissipation capacity (i.e., area under the curve), peak stress, and peak strain of samples is observed with an increase in fibre dosage, indicating the positive effect of fibre addition on the stress-strain performance of concrete. The strength enhancement due to the addition of fibres is higher for BFRAC samples than BFNAC samples. The reduction in peak stress, ultimate strain, toughness and specific toughness of concrete samples due to the utilisation of CRA also reduces with the addition of fibres. Hence, the negative effect of CRA on the properties of concrete samples can be minimised by adding BarChip macro-polypropylene fibres. The applicability of the stress-strain model previously developed for macro-synthetic and steel fibre-reinforced NAC and RAC to BFNAC and BFRAC is also examined.

Download Full-text

Compressive stress–strain behavior of steel fiber reinforced-recycled aggregate concrete

Cement and Concrete Composites ◽

10.1016/j.cemconcomp.2013.11.006 ◽

2014 ◽

Vol 46 ◽

pp. 65-72 ◽

Cited By ~ 105

Author(s):

Jodilson Amorim Carneiro ◽

Paulo Roberto Lopes Lima ◽

Mônica Batista Leite ◽

Romildo Dias Toledo Filho

Keyword(s):

Compressive Stress ◽

Steel Fiber ◽

Recycled Aggregate Concrete ◽

Recycled Aggregate ◽

Fiber Reinforced ◽

Stress Strain ◽

Aggregate Concrete ◽

Strain Behavior

Download Full-text

Stress–Strain Behavior of FRP-Confined Recycled Aggregate Concrete in Square Columns of Different Sizes

Journal of Composites for Construction ◽

10.1061/(asce)cc.1943-5614.0001150 ◽

2021 ◽

Vol 25 (5) ◽

pp. 04021040

Author(s):

Guangming Chen ◽

Junjie Zhang ◽

Yufei Wu ◽

Guan Lin ◽

Tao Jiang

Keyword(s):

Recycled Aggregate Concrete ◽

Recycled Aggregate ◽

Stress Strain ◽

Aggregate Concrete ◽

Strain Behavior

Download Full-text

Experimental Research on Mechanical Properties of Recycled Aggregate Concrete under Uniaxial Loading

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.671-674.1736 ◽

2013 ◽

Vol 671-674 ◽

pp. 1736-1740

Author(s):

Xue Yong Zhao ◽

Mei Ling Duan

Keyword(s):

Elastic Modulus ◽

Coarse Aggregate ◽

Strain Curve ◽

Recycled Concrete ◽

Recycled Aggregate Concrete ◽

Recycled Aggregate ◽

Peak Strain ◽

Stress Strain ◽

Aggregate Concrete ◽

Recycled Coarse Aggregate

The complete stress-strain curves of recycled aggregate concrete with different recycled coarse aggregate replacement percentages were tested and investigated. An analysis was made of the influence of varying recycled coarse aggregate contents on the complete stress-strain curve, peak stress, peak strain and elastic modulus etc. The elastic modulus of RC is lower than natural concrete (NC), and with the recycled coarse aggregate contents increase, it reduces. While with the increase of water-cement ratio (W/C), recycled concrete compressive strength and elastic modulus improve significantly. In addition, put forward a new equation on the relationship between Ec and fcu of the RC.

Download Full-text

Experimental and Theoretical Investigation on the Thermo-Mechanical Properties of Recycled Aggregate Concrete Containing Recycled Rubber

Frontiers in Materials ◽

10.3389/fmats.2021.655097 ◽

2021 ◽

Vol 8 ◽

Author(s):

Yunchao Tang ◽

Wanhui Feng ◽

Zheng Chen ◽

Yumei Nong ◽

Minhui Yao ◽

...

Keyword(s):

Mechanical Properties ◽

Elevated Temperatures ◽

Microstructural Analysis ◽

Strain Curve ◽

Recycled Aggregate Concrete ◽

Recycled Aggregate ◽

Recycled Aggregates ◽

Stress Strain ◽

Aggregate Concrete ◽

Recycled Rubber

The utilization of recycled aggregates made from construction wastes and recycled rubber made from waste tires is an effective method to realize the sustainable development. Thus, this study aims to determine the feasibility of using recycled aggregate concrete containing rubber, named rubberized recycled aggregate concrete (RRAC) as a new type of green-building material. The experimental carbon emissions test verified RRAC as a low-carbon material. In addition, the residual mechanical properties of RRAC were investigated under elevated temperatures. After exposure at 200, 400, and 600 C for 60 min, the stress−strain curve, compressive strength, energy absorption capacity, and spalling resistance of RRAC with recycled aggregate replacement ratios of 50 and 100%, rubber contents of 0, 5, 10, and 15% were explored with microstructural analysis. Moreover, empirical models were proposed to describe the effects of heated temperatures and rubber contents on the stress–strain relationship of RRAC. The results indicated that the rubber particles could reduce the spalling of specimens based on the vapor pressure theory. Therefore, this study provided scientific guidance for the design of structures made with RRAC for resisting high temperatures.

Download Full-text