Shear transfer behavior between substrate recycled aggregate concrete and new natural aggregate concrete

Abstract

This paper investigated the shear transfer behavior between substrate recycled aggregate concrete and new natural aggregate concrete. A total of 72 push-off tests with substrate-to-new concrete specimens were performed considering the effects of concrete strength grade, replacement ratios of recycled coarse aggregate, and lateral constraints ratios. Existing design codes and empirical models for calculating shear strength were reviewed and verified. Results show that concrete cracks occurred and developed along the shear transfer plane. Increasing the concrete grade and lateral constraints can both improve the crack stress and shear strength, while the incorporation of recycled coarse aggregate has a slight adverse effect on them. The model in fib Model Code 2010 based on shear-friction theory gave the most accurate but still conservative values compared with experimental results and can be used to predict the shear transfer behavior between substrate recycled aggregate concrete and new natural aggregate concrete.

Retracted: Predicting the compressive strength of modified recycled aggregate concrete

“…In addition to the destruction of natural resources, it imposes a lot of solid waste in the environment. 19,29,32,33,38,39,42,56,62 Abbreviations: AC, curing age; ADR, additive regression; B, total binder; BAG, bagging predictors; CA, coarse aggregate; CS, compressive strength; DT, decision table; GF, glass fiber; GPR, Gaussian process regression; LWL, locally weighted linear; M5R, M5-Rules; MLP, multilayer perceptron; RA, recycled aggregates; RAC, recycled aggregate concrete; REPT, reduced-error pruning tree; RF, random forest; SF, silica-fume; SSD, saturated surface dried; SVR, support vector regression; W, water.…”

“…Most of the solid waste of countries is usually caused by construction and demolition in the construction industry. In addition to the destruction of natural resources, it imposes a lot of solid waste in the environment 19,29,32,33,38,39,42,56,62 …”

Mixture ratio optimization of basalt fiber recycled aggregate concrete based on RSM

“…With the acceleration of urbanization, a large number of old buildings will be demolished, which will inevitably produce a large amount of construction waste [1][2][3]. Construction waste mainly includes waste concrete and waste bricks.…”

Innovative modeling framework of chloride resistance of recycled aggregate concrete using ensemble-machine-learning methods

“…Waste valorization is achieved by crushing concrete rubble into recycled aggregates (RA) and then being used to replace, partly or totally, natural aggregate (NA) in new concrete manufacture [5]. Despite some negative effects brought by such substitution, the resulting products, i.e., recycled aggregate concrete (RAC), is believed to be able to meet general engineering needs [6][7][8][9]. As a result, RAC is increasingly encouraged for structural applications [10][11][12].…”