Date: 1/1/2024. Experimental Study on Effect of Recycled Reinforced Concrete Waste on Mechanical Properties and Structural behaviour of the Sandy Soil. Publication: IJCSM. Date: 11/30/2023. Recycled Aggregate Mortar Content and Composition Using Handheld X-Ray Fluorescence. Publication: Materials Journal. Date: 9/1/2023.
RA concrete is less durable due to high porosity of recycled aggregate. However, lower resistance to ingress of certain agents might be compensated by the combination of …
This paper discusses the suitability of producing concrete with 100 % recycled aggregate to meet durability and strength requirements for different …
Sustainable reuse of ceramic waste powder as a supplementary cementitious material in recycled aggregate concrete: Mechanical properties, durability and microstructure assessment ... with natural aggregate concrete (NAC). Nevertheless, the added adequate amount of compensated water can acquire good workability for RAC …
Abstract. Aggregate type - natural or recycled - governs a range of concrete properties (e.g. water absorption and workability). Knowing this, there are many recommended mixing methods for ...
This concrete trial was prepared using only natural, fine and coarse, aggregates to show workability, measured by slump test [ 2 ], of 100 ± 20 mm. The concrete trial used for reference showed 461.7 kg/m 3 of cement content and 0.45 of water/cement ratio. Recycled concrete were made using the reference mix design just …
ABSTRACT: This paper describes two laboratory based experimental studies to determine some plastic and hardened properties of concrete incorporating recycled concrete aggregates. One study examines the effects that the cleanliness of recycled coarse aggregate particles has on the concrete properties, where cleanliness relates to …
The workability of the recycled aggregate concrete was enhanced to level comparable to the reference concrete (165 mm) by adding superplasticizer (1% of …
The results show that the content of old mortar and the quality of recycled concrete are closely related to the durability of prepared RFA concrete. For example, …
This study provides the results of an experiment on the possibility of using high-volume ground granulated blast furnace slag (HVGGBFS)-based concrete as mass concrete. In addition to the control concrete, the total weight of the binder was 75% ground granulated blast furnace slag (GGBFS) and 25% ordinary Portland cement (OPC). For …
The utilisation of recycled concrete aggregate (RCA) in Self-Compacting Concrete (SCC) has the potential to reduce both the environmental impact and financial cost associated with this increasingly popular concrete type. However, to date limited research exists exploring the use of coarse RCA in SCC. The work presented in this …
The recycled concrete aggregates have a significant water absorption capacity in a concrete mix. The simple volume replacement of NA by RA affects concrete workability and performance. ... It shows that all mixes met the target workability apart from C0, 100 (concrete without superplasticiser and replacement of FNA by FRA). …
This study presents the effects of recycled concrete aggregate (RCA) on the key fresh and hardened properties of concrete. ... 10.1590/S1516-000039 Properties of High-Workability Concrete with Recycled Concrete Aggregate Md. Safiuddina*, Ubagaram Johnson Alengaramb, Md. Abdus Salamb, Mohd Zamin Jumaatb, Fahrol …
The recycled aggregate concrete (RAC) is widely applied in existing engineering, due to the great economy and environmental protection. However, there are several disadvantages of RAC: complex existing mix design methods, lower strength, and brittleness. This chapter initially presents a simple mixed design method.
As recycled concrete aggregate is more vulnerable to deformation than raw aggregate, the aggregates' weakness reduces the Young's modulus for concrete when RCA is used. According to Kou et al. [ 48 ], by replacing 50% coarse RCA, the elasticity modulus decreased by 12.6%, whereas with the replacement ratio, it is …
Using recycled aggregates from construction and demolition waste can preserve natural aggregate resources, reduce demand of landfill, and contribute to sustainable built environment. This study provides a comprehensive review on recycled aggregate (RA) and recycled aggregate concrete (RAC) regarding their history, …
which one mix was of normal aggregate concrete at 0% replaced by RCA and other are of recycled aggregate concrete at 20%, 30% and 60% replaced by RCA. The compressive strength of the specimens was ...
This paper describes two laboratory based experimental studies to determine some plastic and hardened properties of concrete incorporating recycled concrete aggregates. One study examined the effects that the cleanliness of recycled coarse aggregate particles has on the concrete properties, where cleanliness relates to the amount of cement paste …
Aggregates are generally thought of as inert filler within a concrete mix. But a closer look reveals the major role and influence aggregate plays in the properties of both fresh and hardened concrete. Changes in gradation, maximum size, unit weight, and moisture content can all alter the character and performance of your concrete mix.
This research paper presents an experimental evaluation of the effect of water-cement ratio on the flexural strength of reinforced concrete beams made with 50% replacement of coarse aggregates ...
The workability and mechanical properties of ternary composite geopolymer concrete (i.e., GGBS, FA, and RFBP) made by recycled aggregates containing recycled clay brick aggregates at different replacement ratios (i.e., different replacement ratio of RFBP and RA-RFBA) and different mix proportions were investigated.
The use of recycled aggregates concrete (RAC) with coarse recycled concrete aggregates (CRCA) has been widely studied in literature. A number of works …
This concrete trial was prepared using only natural, fine and coarse, aggregates to show workability, measured by slump test [ 2 ], of 100 ± 20 mm. The …
Recycled concrete aggregates (RCA) sourced from waste concrete are a sustainable alternative to natural crushed stone aggregates. The strength and durability properties of concrete containing RCA were evaluated by a comprehensive …
The slump test is the common and practical workability test for fresh concrete and is performed in accordance with ASTM C143 [17]. Fig. 1 shows the slump values for HPCs that are prepared with natural aggregate (b) and RA (c). The maximum detected slump value of HPC without RA was 185 mm [18].Previous studies, however, had …
Replacing natural sand with crushed clay brick aggregate in the concrete mix reduces the workability of the mix. This is due to the excessive water absorption capacity of the CCBA material and the angular structure of the CCBA particles, which reduces the fluidity of the concrete mix; hence the use of a superplasticizer is highly recommended.
Abstract. The use of recycled aggregates (RA) for concrete production usually involves a reduction of the workability as measured by slump. This reduction is mainly due to higher absorption rates ...
This study presents the effects of recycled concrete aggregate (RCA) on the key fresh and hardened properties of concrete. RCA was used to produce high-workability concrete substituting 0- natural coarse aggregate (NCA) by weight. The slump and slump flow of fresh concretes were determined to ensure high workability. In addition, …
The use of recycled aggregate concrete can save natural resources and reduce environmental pollution, which has been widely concerned in recent years. ... concrete workability is poor, concrete vibration and compaction are very difficult, and is also not conducive to the formation of high–strength concrete. Fig. 3 (a) ...
1.2 Advantages of recycling of construction materials -: Used for construction of precast & cast in situ gutters &kerb‟s. Cost saving: - There are no detrimental effects on concrete & it is expected that the increase in the cost of cement could be offset by the lower cost of Recycled Concrete Aggregate (RCA).
The compressive strength of the RCWA concrete is acceptable at all RCWA replacement for grade 15 and 25 concrete with strengths higher than the design values of 15 and 25 MPa. For grade 40 ...
Concrete formed with dolomite aggregate, slump = 11 cm, performs better than concrete including recycled aggregate, slump = 9 cm, in terms of workability, according to the results. This is because recycled aggregate is more porous and has a higher water absorption value than dolomite aggregate, as shown in Table 4 .
Recycled concrete aggregate shows high porosity, low density, high water absorption and low strength than normal aggregate concrete ... In order to improve the workability of concrete, Auramix-300 which is advanced low viscosity retarding super plasticizer (SP) was used. The mixtures were prepared at four water cement ratios …
The difference between RCA and natural coarse aggregates is adhered/bonded mortar from old concrete on the RCA surface (Kim et al., 2018).As RCA are obtained through the crushing of construction and demolition waste, RCA possess adhered/bonded mortar from old concrete along with natural aggregates, as shown in …
Large quantities of construction and demolition waste are generated annually, and in many parts of the world, it is disposed of in landfills. Utilizing this waste to produce coarse aggregates for concrete production offers a potentially sustainable approach that mitigates environmental impacts. Despite the widespread encouragement of using …
Workability. Aggregates influence the workability of the concrete by the amount of aggregate, the relative proportions of fine and coarse aggregate, and the different aggregate properties. ... concrete needs two to three percent more sand by absolute volume and 6 to 9 kilograms more water per cubic meter when crushed sand is used …
Recycled concrete aggregates (RCA) obtained from C&D waste can be considered as an essential source of supplementary building material in producing 'green concrete' or recycled aggregate concrete (RAC). ... Properties of high-workability concrete with recycled concrete aggregate. Mater. Res., 14 (2011), pp. 248-255, …
After an extensive review of the literature, Padmini et al. [2] highlight the following aspects: recycled aggregates from concrete requires more water for the same workability than conventional concrete; density, compressive strength and modulus of elasticity are relatively lower than that of the parent concrete; and for a given …