Using Recycled Concrete Aggregate | Specify Concrete
However, using a recycled aggregate of more than 65% can impact the mix's durability significantly, reducing its physical properties tenfold. The optimum amount blended in with the concrete should be 35%. Some experiments have shown that the recycled aggregate is durable, no doubt, but not as sturdy as natural coarse aggregate.
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Mix Design Recycled Aggregate Pervious Concrete and the …
The compressive strength and the permeability coefficient of recycled aggregate pervious concrete based on this mix proportion are 25.07 Mpa and 6.23 mm/s, respectively, which are in line with the provisions of Technical Specification for Application of Recycled Aggregate Pervious Concrete (CJJ/T 253-2016) and can be used for …
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Recycled Aggregate Concrete | SpringerLink
4.2.1 Review Points. The basic idea of NAC mix proportion design in China [] is that the concrete mix proportion design depends on three parts: the w/c ratio, water amount, and sand- aggregate ratio.According to the preparation of the concrete strength and the actual strength of cement, the w/c ratio is obtained by calculations using the …
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Mix design development of fly ash-GGBS based recycled aggregate
The manufacturing of recycled aggregate geopolymer concrete is one of the cost-effective ways to dispose vast amounts of debris. The use of recycled aggregate geopolymer concrete as structural concrete is not encouraged due to lack of appropriate mix design methodology. The current study aims to develop a new mix design …
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Intelligent mix design of recycled brick aggregate concrete …
Compressive and splitting tensile strength tests on recycled concrete with CRCA ( substituting limestone aggregate) made from two mixed SC with varying strengths, have been implemented to ...
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Strength and Durability Evaluation of Recycled Aggregate Concrete
This paper discusses the suitability of producing concrete with 100 % recycled aggregate to meet durability and strength requirements for different applications. ... E., & Gomart, H. (2014). Mix design and properties of recycled aggregate concretes: Applicability of Eurocode 2. International Journal of Concrete Structures and Materials, …
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Mix design procedure for recycled aggregate concrete
In this paper, the most-concerned questions of recycled aggregate concrete (RAC) application, i.e., the structural safety performance, the availability of design code and project experience, and ecological and economic costs, are overviewed, aiming to find the answer to whether it is feasible to apply RAC in main structural …
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(PDF) Mix Design Method for Self-Compacting Recycled Aggregate Concrete
This article is on the development of a mix design method for self-compacting recycled aggregate concrete (SCRAC) by considering the adhered mortar content (AMC) on the surface of the aggregate.
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Use of recycled aggregate concrete in structural members: …
Notable examples include studies on: recycled concrete aggregate properties with amounts of old adhered mortars (Duan and Poon Citation 2014), ... Furthermore, considering the appropriate mix design and binder materials when using RCA can enhance the overall density of the concrete mixture.
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Concrete Mix Design for Completely Recycled Fine Aggregate by …
The undesirable properties of conventional recycled fine aggregate (RFA) often limit its application in the construction industry. To overcome this challenge, a method for preparing completely recycled fine aggregate (CRFA), which crushes all concrete waste only into fine aggregate, was proposed. The obtained CRFA had high apparent …
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Mix design for recycled aggregate thermal insulation concrete …
The effects of the UFS and NS mineral admixtures produced greater performance improvements in the concrete than the recycled coarse aggregate. Finally, the optimal mix proportion was determined. For this mix, the thermal conductivity coefficient and compressive strength of the concrete were 0·305 W/(m.K) and 46·7 MPa respectively.
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The Simple Mix Design Method and Confined Behavior …
The results show that the proposed mix design method can mix different stable strength grades of RAC promptly and efficiently, and the steel tube and GFRP tube can provide a well confining effect on core RAC to improve the mechanical behavior of column. For the environment protection and sustainable development in building construction, waste …
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Mix Design of Recycled Aggregate Concrete …
This paper. is devoted to the studies of material and mechanical properties of recycled aggregate concrete using. packing density method. This paper considers mix of two different aggregate …
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Sustainable mix design of recycled aggregate concrete
Sustainable mix design of recycled aggregate concrete using artificial intelligence. February 2024. Journal of Cleaner Production. DOI: 10.1016/j.jclepro.2024.140994. License.
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Performance of Recycled Fine-Aggregate Concrete Using Novel Mix
The result shows that the developed mix design uses lesser quantities of cement and fine aggregates. Replacement of about 30% river sand (RS) by RFA was found optimum. ... S., S. Kumar, and S. V. Barai. 2017. "Recycled aggregate concrete: particle packing method (PPM) of mix design approach." Constr. Build. Mater. 152 …
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A strength-based mix design method for recycled aggregate concrete …
This paper puts forward a strength-based mix design method for recycled aggregate concrete using a modified empirical formula. A total of 30 mixes, the amount of cement varies from 300 kg/m 3 to 500 kg/m 3 and the proportion of recycled coarse aggregate ranges from 0% to , were prepared for the regression analysis of …
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A Novel Mix Design Method for Mixed Recycled Coarse Aggregate Concrete …
Due to the complex component of coarse aggregate used in mixed recycled aggregate concrete (MRC), the conventional mix design method is not suitable for MRC. The increase of coarse aggregate heterogeneity, larger total mortar volume of MRC, and the weaker strength of CRA and BRA are the primary differences between MRC and natural …
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Durability of recycled aggregate concrete designed with equivalent
The RCA-concrete mixes were proportioned using a new concrete mix design method, termed the equivalent mortar volume (EMV) method. The EMV method is based on the hypothesis that RCA is a composite material comprising mortar and natural aggregate; therefore, when proportioning a concrete mixture containing RCA, one must …
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The Simple Mix Design Method and Confined Behavior …
For the environment protection and sustainable development in building construction, waste concrete can be processed into recycled aggregate to mix the recycled aggregate concrete (RAC). However, the existing mix design methods of RAC were complex, and the mechanical properties of RAC were more weakened than …
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The Simple Mix Design Method and Confined Behavior …
2. The Simple Mix Design Method of Recycled Aggregate Concrete. The simple mix design method, including the orthogonal test method and the single-factor test method, were combined to determine the mix proportion of RAC in this section. The former was firstly applied to find the main factors.
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Mix Design for Pervious Recycled Aggregate Concrete
Moreover, sriravindrarajah et al. [23] in their mix design of pervious recycle aggregate concrete stated that using aggregate size variation from 5 to 13 mm and 13 to 20 mm increased the ...
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recycled concrete Topic
The reason for recycling is the reduction of waste in order to protect nature against pollution, the increasing shortage of suitable dumping grounds, and to save energy and natural resources. Concrete debris is typically reclaimed as recycled aggregate (RCA). By recycling concrete, valuable landfill space and natural resources are …
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Mix design of recycled aggregate concrete
This paper prepared recycled aggregate pervious concrete by replacing natural aggregate with volume of waste concrete. We carried out experiments to study the influences of strength grade and ...
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Studying the mix design and investigating the …
The orthogonal experimental investigation indicated that water-to-binder ratio had the most significant effect on concrete compressive strength, followed by ratio of RCAs to binder, and replacement ratio of RCAs to natural aggregates. The optimized mix design for pervious concrete containing RCAs was identified to achieve highest strength (i.e ...
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Basic creep and fracture response of fine recycled aggregate concrete
Table 1 displays the mix design of both natural sand mortar and recycled concrete aggregate mortars. We followed standard ASTM C 305 for the casting procedure. After casting, the specimens were poured into prismatic molds, covered with plastic film, and left to cure for 24 h under vibration.
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Effect of Aggregate Size on Recycled Aggregate …
The replacement levels of recycled aggregate were 25% and 50%, and equivalent mortar volume mix design was applied for recycled aggregate concrete. The results show that the mechanical …
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Evaluation of conventional and equivalent mortar volume mix design
The EMV method is a type of mix design that maintains the volume of total mortar in RAC (i.e., the adhered mortar in recycled aggregate and fresh mortar) constant by considering the adhered mortar ...
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Influence of Mix Design on Physical, Mechanical and …
The decrease in the quality of recycled aggregate due to an increase in the number of recycling is a primary factor that limits the multi-recycling of concrete. This degradation adversely affects concrete performance; thus, the characteristics of recycled aggregate should be considered during the mix design stage, but little research has …
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Optimum mix design of recycled concrete based on the
The reuse of recycled aggregates in the composition of concrete is a major challenge today in response to the high cost of construction and the environmental impact of waste This work evaluates ...
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Evaluation of conventional and equivalent mortar volume mix design
The use of recycled aggregate concrete (RAC) is undoubtedly on the increase and further research is required for more appropriate mix design methods. This paper presents the result of investigations into the mix design of RAC. The study examined experimentally two conventional and one unconventional mix design methods. The …
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