compacted low strength material (clsm) made with material such as fly ash and recycled aggregates is used as filler at city infrastructure canals without compaction need. experimental small specimens and large canals were casted with this concrete and tested to give several results. test results of compression strengths on 12 different designs shows that this concrete with high workability and ...

The research reported herein studied the permeability of concrete containing recycled-concrete aggregate (RA), superfine phosphorous slag (PHS), and ground granulated blast-furnace slag (GGBS) with and without stress. Test results showed that the chloride diffusion coefficient of RA concrete (RAC) without external loads decreased with time, and the permeability of RAC is much lower than that of...

Two groups of concrete mixtures, one without sodium sulfate and other with sodium sulfate, as an activator, were made with recycled powdered gypsum-wallboard for this investigation. Group 1 concrete mixtures were made using up to 20% of ASTM Class C fly ash and 20% powdered gypsum while Group 2 contained up to 60% of fly ash and 20% of powdered gypsum by mass. Relevant properties of concrete we...

Abstract This study investigates the effect of replacement recycled concrete as coarse aggregates using Densified Mixture Design Algorithm Method (DMDA) in unconfined behavior. DMDA was applied to produce with least void. Compressive strength, flexural strength and split tensile tests were conducted on 7-, 14-, 28- 56-day old specimens. test results showed that specimens 20, 30, 40% RCA replace...

The main strategy to reduce the environmental impact of the concrete industry is to reuse the waste materials. This research has considered the combination of cement replacement by industrial by-products, and natural coarse aggregate substitution by recycled aggregate. The aim is to evaluate the behavior of concretes with a reduced impact on the environment by replacing a 50% of cement by indus...

Concrete pavement recycling is a relatively simple process that involves breaking, removing and crushing hardened concrete from an acceptable source to produce recycled concrete aggregate (RCA). The formal process of RCA production typically involves an initial evaluation of the existing source concrete; pavement preparation, which may include removal of an asphalt overlay; pavement breaking, r...