Comparative Study on Natural and Recycled Concrete Aggregate …
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 …
Strength and Durability Evaluation of Recycled …
This paper discusses the suitability of producing concrete with 100 % recycled aggregate to meet durability and strength requirements for different …
A Comprehensive Review on Recycled Aggregate and
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, …
The Utilization of Recycled Aggregate in High Performance Concrete…
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 …
Aggregate in Concrete
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.
Workability study of concretes made with recycled …
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 …
Workability and Rheology of Fresh Recycled Aggregate Concrete
The use of recycled aggregates concrete (RAC) with coarse recycled concrete aggregates (CRCA) has been widely studied in literature. A number of works investigated both mechanical and durability-related properties of these concretes; however, fresh properties of RAC have not been extensively analyzed yet. Limited studies were …
Properties of high-workability concrete with recycled concrete aggregate
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, …
Recycled aggregate concrete: mechanical and durability …
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 …
Use Of Recycled Aggregate In Concrete
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).
Properties of Recycled Aggregate Concrete
The workability of recycled aggregate concrete not only depends on the absorption capacity of recycled aggregate but also on the shape and texture of …
Effects of recycled fine aggregates on properties of concrete
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, …
Recycled Aggregates
Recycled concrete aggregates are being considered for use in the O'Hare Modernization Project (OMP). Laboratory testing using a two-stage mixing method showed that using RCA from Chicago O'Hare International …
Mass GGBFS Concrete Mixed with Recycled Aggregates as …
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 …
Effect of recycled concrete aggregates on the mechanical …
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 …
A study on the strength and durability characteristics of fiber
The mechanical properties and other attributes of recycled concrete aggregates are impacted by the parent concrete source attributes, such as proportioning of mixes and workability [21]. The durability and mechanical characteristics of concrete samples produced with recycled concrete aggregates are generally worst as related to …
Effect of Moisture Condition and the Composition of Aggregate …
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 …
The effect of superplasticisers on the workability and …
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). …
Recycled aggregates from construction and demolition
For recycled concrete aggregate from concrete waste, the use of up to 90% of recycled aggregate is allowed if water absorption is at most equal to 10% and content of contaminants up to 0.2%; meanwhile, for recycled concrete aggregate from demolition waste, the content of recycled aggregate is limited to 70%, while the limits …
WORKABILITY AND COMPRESSIVE STRENGTH PROPERTIES OF CONCRETE …
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 …
Sustainable Construction: Use of Recycled Concrete Aggregate
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 …
MECHANICAL AND PHYSICAL PROPERTIES OF RECYCLED AGGREGATES CONCRETE
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 ...
Impact of Incorporating Rice Husk Ash (RHA) into …
workability of concrete if the ratio increases. Wilson et al. [12] used the RHA as partial ... The recycled concrete aggregates used were gathered from the removed road pavement in the project of DPWH 3rd Engineering District of Palawan in Zigzag Road, Puerto Princesa City. The road was constructed in 2009 but removed in 2016 due to the traffic ...
Workability and mechanical properties of GGBS-RFBP-FA
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 effect of superplasticisers on the workability and …
More recent research on concrete made with coarse recycled concrete aggregates [4], [5], [6] and fine recycled concrete aggregates (FRA) [7] has led to positive results concerning the use of RA in structural concrete. ... It shows that all mixes met the target workability apart from C0, 100 (concrete without superplasticiser and …
Experimental Work of Compressive Strength and …
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 ...
Durability of recycled aggregate concrete
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 …
Properties of high-workability concrete with recycled concrete aggregate
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 …
Mechanical performance of recycled aggregate concrete in …
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) ...
Strength and Durability Evaluation of Recycled …
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 …