Abstract
A novel recycled aggregate concrete was prepared by replacing the natural aggregate with recycled lightweight aggregate. Subsequently, the mechanical properties and compressive stress‐strain constitutive relation of the recycled lightweight aggregate concrete (RLWAC) were explored. For this purpose, the recycled lightweight aggregate (RLWA) replacement ratio (0%, 25%, 50%, 75%, and 100%) was selected as a variable, and the compressive strength of 15 cube and 30 prism specimens was evaluated. The failure morphology of the specimen was subsequently characterized, along with the cubic compressive strength, axial compressive strength, peak strain, ultimate strain, and other performance indices. The influence of the replacement ratio for the specimen indices of the RLWAC was also analyzed. It was observed that the dry apparent density of RLWAC decreased gradually on increasing the replacement ratio. Compared with 0% replacement ratio, a decrease of 6.50%, 11.39%, 21.84%, and 27.54% was observed, respectively. On enhancing the RLWA replacement ratio, the compressive strength, peak strain, and ultimate strain of RLWAC were observed to be gradually reduced. As the replacement ratio was increased from 75% to 100%, the peak strain was noted to decrease the most by about 6.8%. As the replacement ratio was increased from 50% to 75%, the ultimate strain decreased the most by about 14.2%. Based on the experimental findings, the functional relationships of the strength indices and the conversion value of each strength index with the replacement ratio were also established. Finally, based on the model proposed by the existing model, the stress‐strain equation of RLWAC was developed, and the fitting results were observed to be in good agreement with the test results.
Highlights
Owing to the piling of construction waste in China, the effective use of the waste has become a serious concern [1, 2]
[8,9,10], the recycled coarse aggregate has been mostly derived from ordinary concrete; the recycled lightweight aggregate (RLWA) produced from the recycled lightweight aggregate concrete (RLWAC) structures after dismantling has not been explored in detail [11, 12]
The specimens were dried to a constant weight in an electric drying oven (SY1012) at 105 °C, followed by the measurement of the quality. e measured dry apparent density under 0%, 25%, 50%, 75%, and 100% replacement ratio were 2353 kg/m3, 2200 kg/m3, 2085 kg/m3, 1839 kg/m3, and 1705 kg/m3, respectively
Summary
Owing to the piling of construction waste in China, the effective use of the waste has become a serious concern [1, 2]. In this respect, after the construction waste is crushed and graded, a fraction (or even all) of the natural coarse and fine aggregates can be replaced as per the specific composition. As a source of construction waste, LWAC can achieve resource utilization of RLWAC construction waste through RAC technology [16,17,18].
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