A series of consolidated drained triaxial compression tests were performed on recycled concrete aggregates to investigate the feasibility of their use as a backfill material for geotechnical engineering structures requiring a high stability while allowing a limited amount of deformation, such as embankments and conventional type and geosynthetic …
This study investigated the physical and chemical characteristics of recycled concrete powders (RCP) generated by repeated recycling of concrete and discussed their application as a partial replacement for cement in mortar. RCPs smaller than 0.15 mm were obtained from three different generations of multi-recycled coarse …
The pursuit of sustainable construction practices has led to a growing interest in the utilization of recycled materials in concrete production. To enhance the utilization of recycled aggregate concrete, its performance in terms of mechanical characteristics need to be optimized. This study investigates the effect of fly ash and …
To improve the deformation performance of recycled concrete with tailings (TRC), its carbonization characteristics and deterioration mechanism with different polypropylene fiber content were analyzed macroscopically and microscopically. The results showed that the fiber had little effect on the compressive strength, which increased first …
The experimental study on stress–strain characteristics of natural and recycled concrete containing waste foundry sand and additives can be concluded as: The stress–strain characteristics of construction waste concrete are inferior to those of natural aggregate concrete; the strength and failure strain decrease in CW concrete.
The results from a series of repeated load triaxial tests on recycled concrete aggregate (RCA), crushed bricks (CB), and waste excavation rock (WR) reported that most of the recycled C&D materials produced comparatively smaller permanent strain and greater resilient modulus than those of the commonly used granular subbase natural …
However, the characteristics of micro pores for concrete, especially for recycled aggregate concrete, under the coupling action of various environmental …
According to the research results of the research group, among the different mix ratios with the substitution rate of 20%, 30%, 40%, 50% and 60% and the mixing ratio of recycled brick-concrete aggregate of 0:1, 3:7, 5:5, 7:3 and 1:0, the mix ratio with the substitution rate of 30% and the mixing ratio of 1:1 has the best mechanical properties.
In order to examine the effect of high temperatures on the microstructural characteristics and residual mechanical properties of recycled aggregate concrete mixed with glazed hollow beads (RATIC ...
This paper discusses the suitability of producing concrete with 100 % recycled aggregate to meet durability and strength requirements for different applications. Aggregate strength, gradation, absorption, specific gravity, shape and texture are some of the physical and mechanical characteristics that contribute to the strength and durability …
This paper reviews the findings of research on the effects of recycled fine aggregates (RFAs) on the permeability, drying shrinkage, carbonation, chloride ion …
The saturated hydraulic conductivity (ksat) and water characteristic curves (WCCs) of three recycled asphalt pavements (RAPs) and three recycled concrete aggregates (RCAs) were measured.
DOI: 10.1016/j.conbuildmat.2019.117978 Corpus ID: 213535023; An evaluation of the recycled aggregate characteristics and the recycled aggregate concrete mechanical properties @article{Bai2020AnEO, title={An evaluation of the recycled aggregate characteristics and the recycled aggregate concrete mechanical properties}, …
The objective of this paper is to provide a comprehensive study about the performance of concrete using mixed coarse recycled aggregate (MCRA) as an alternative for natural aggregate (NA) at replacement levels of 0, 30, 60, and , which can greatly reduce the environmental pollution by incorporating the construction and demolition …
As granular waste from iron ore smelting, IOT have the obvious characteristics of fine powder and pozzolanic activation [].The porosity and related mechanical properties of recycled aggregate concrete are lower than those of ordinary concrete due to the existence of adhesive mortar [2,3].At the same time, the utilization …
31 rowsRecycled concrete and masonry (RCM) aggregate can be described as graded aggregate produced from sorted and clean waste concrete and masonry. The RCM …
concrete increased by 28% and 15%, respectively. e recycled aggregate is pretreat ed with silica fume slurry by Sasanipour et al. (2021), leading to an improvem ent of resistivity of relevan t ...
Section snippets Materials and specimen preparation. This study used ordinary silicate Portland cement P.O. 42.5 with a fineness modulus of 0.63 as the binder, natural medium-sized sand with a fineness modulus of 2.8 as the natural fine aggregate, and natural coarse aggregate and recycled coarse aggregate with a particle size …
The recycled aggregate ratio in concrete has been altered to determine the effect on the mechanical and fracture properties. For determining fracture parameters, a 3-point bending single-edge notched fracture test was used. The results indicated that the steel fiber-reinforced concrete made with recycled aggregate showed similar …
The properties of the recycled aggregate and of the new concrete made from it, with nearly of aggregate replacement, were tested.Significant differences …
This influenced by strength of crushed concrete, water to cement ratio of crushed and new concrete. For concrete produced from both recycled coarse and fine aggregate is between 15 to 40%. 2. Strength Variations Strength variation of concrete produced from recycled aggregate is higher than concrete made from natural aggregate.
The poor performance of recycled aggregate concrete (RAC) limits its application on wide filed. This paper attempted to study the influence of fly ash (FA), slag powder (SP) and silica fume (SF) on the performance of RAC from a microscopic point of view. ... Pore characteristics of recycled aggregate concrete and its relationship with ...
In this paper, a comprehensive literature review was conducted on the utilization of recycled concrete aggregate (RCA), which is the dominant construction …
Replacing natural aggregate with construction waste to prepare concrete is an effective way of its resource utilization, which is in line with China 's " carbon peaking and carbon neutrality " strategy and the green development needs of the construction industry.Due to the existing technology is difficult to completely separate waste bricks …
At present, compared with other recycled coarse aggregate types, recycled concrete aggregate is the most extensive implemented RA in construction, and organizations in many countries have developed specifications [10], [11], [12]. In this paper, the performance and application of recycled concrete aggregate were focused on.
Different types of shredded recycled PET fibres, straight and deformed, together with different fibre lengths, 30 mm and 50 mm, have been assessed, for varying percentage addition in concrete. The tensile properties and pull out characteristics of the fibres have been determined.
This paper discusses the suitability of producing concrete with 100 % recycled aggregate to meet durability and strength requirements for different applications.
Relationships between recycled concrete aggregates characteristics and recycled aggregates concretes properties. Author links open overlay panel Safiullah Omary, Elhem Ghorbel, George Wardeh. Show more. ... The analysis of the frost resistance performance show that recycled concrete gravels are less resistant to freeze/thaw than …
This study assessed the efficacy of water leach tests (WLTs) and pH-static leach tests in evaluating the leaching behavior of distinctly carbonated recycled concrete aggregates (RCA). The leaching of barium (Ba), calcium (Ca), chromium (Cr), magnesium (Mg), and sulfate (SO 4) from seven RCA samples were studied. WLTs at several liquid …
The physical and mechanical properties of recycled aggregates (RA) among different particle sizes are compared. Results demonstrate that adhesive mortar content is a significant factor in determining the properties of recycled aggregate concrete (RAC). The adhesive mortar content on the surface of recycled aggregates is critical in selecting the …
Recycled concrete aggregate (RCA) has been widely used as a resource in reinforced soil structures, especially as a substitute for natural aggregate. Direct shear tests were conducted using a dynamic direct shear apparatus to study the effects of particle-size gradation (0.06–37.5 mm) on the shear properties of RCA-geogrid interface, in which ...
AbstractSulfate-induced deterioration can reduce the service life of recycled aggregate concrete (RAC). To demonstrate the transport behavior of sulfate ions in RAC, a two-dimensional, six-phase numerical model of RAC is proposed in this study. Sulfate ...
From Table 9, it was observed that concrete made with C&DW-based coarse recycled concrete aggregate either sourced from the RCA plant or manufactured in the laboratory by crushing concrete cube ...
The cracking in recycled concrete initiates earlier; the fracture length is generally larger and the use of high proportion of recycled aggregate results in higher strain gradients in the fracture process zone. ... The characteristics of recycled aggregate and ITZ can highly influence the mechanical properties of RAC [9], [11], [12], [13 ...