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However, currently ANN are mainly used in concrete made only with natural aggregates, and is rarely adopted in the concrete containing recycled aggregates because of their complex composition of recycled aggregates, although Topçu and Sarıdemir made a trial on predicting the compressive and splitting tensile strengths of recycled aggregate concretes containing silica fume.

Total four concrete mix batches were tested in which one mix was of normal aggregate concrete at 0% replaced by RCA and other are of Recycled aggregate concrete at 20%, 40% and 60% replaced by RCA. The result of the test are shown in the table 1.The compressive strength of the specimens was calculated by following formula.

14.05.2015 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 of concrete.

te compressive strength, as well as the methods of crushing of recycled aggregate [2,9]. 2.6. Presence of harmful substances Harmful substances, which may be present in recycled aggregate, are a consequence of harmful substances present in the original concrete, further- more, of exposure of the original concrete to aggres-sive effects of various chemicals during the original exploitation, of ...

Recycled aggregate concretes (RACs) made of building wastes can achieve good environmental and economic benefits. Since fire is one of the most common disaster in modern high-rise buildings, the strength, deformation and bearing capacity of recycled concrete structures under high temperatures should be carefully studied in design.

the effect of recycled concrete aggregate on the strength of ordinary concrete. The basic engineering properties of Recycled Concrete Aggregate (RCA) is evaluated and it is compared with the Normal Aggregate (NA). Similarly, the basic concrete properties like, compressive strength, workability etc. are

The corresponding result for gravel concrete 0.94, 0.92; The compressive strength at 28 days of concrete made with granite on bare ground is 26.49 N/mm 2 , that of concrete mixed on Concrete ...

and density with time. Reduction in the 28 -day compressive strength of concrete due to complete replacement of natural aggregates with recycled concrete aggregate ran ges from 11% to 33%. RCA can replace NA in the production of both non -structural and structural concrete. Patil.et.al. (2013), this study aimed to evaluate physical properties

15.11.2017 Study on effect of compressive strength of recycled aggregate concrete with water cement ratio. Concrete. 2005;2:46–8. Google Scholar. 16. Poon CS, Azhar S, Anson M, Wong YL. Strength and durability recovery of fire-damaged concrete after post-fire-curing. Cem Concr Res. 2001;31(9):1307–18. CrossRef Google Scholar. 17. ACI Committee 555. Removal and reuse of hardened concrete

Download Citation On Jan 1, 2017, Chunling YAN and others published Two-factor Analysis on Compressive Strength of Recycled Aggregate Concrete

Study of recycled concrete aggregate quality and its relationship . with recycled concrete compressive strength using database analysis. I. González-Taboada, B. González-Fonteboa *, F. Martínez-Abella, D. Carro-López. Department of Construction Technology, E.T.S.I. Caminos, Canales, Puertos. University of A Coruña. Campus Elviña (A ...

In this study 192 concrete cylinders (100 phi x200mm) and 192 mortar cubes (50x50x50mm) were cast and tested at 28days for compressive strengths of natural aggregate concretes (NAC) and recycled ...

Research on this subject started with basic observations on the effects of using recycled concrete aggregates (RCA) on the compressive strength of concrete (Buck, 1973, Frondistou-Yannas, 1977), as well as its economic feasibility (Frondistou-Yannas and Itoh, 1977). Since then, research on recycled aggregate concrete (RAC) has become ...

The sustainable Conventional Concrete (with 20% class F-fly ash recycled aggregates) developed a lesser 14 and 28-days compressive strength compared with M20 graded Conventional Concrete

Compressive Strength. Compressive strength of RCA concrete can be influenced by the properties and amount of recycled aggregate. Several factors can influence the compressive strength in RCA concrete, including the water/cement (w/c) ratio, the percentage of coarse aggregate replaced with RCA, and the amount of adhered mortar on the RCA. Most ...

This paper investigates the effect of recycled con-crete aggregate (RCA) on the rate of concrete compressive strength and stiffness gain with time and on the bond strength between seven-wire steel prestressing strand and concrete. The use of RCA did not have a significant effect on the rate of concrete compressive strength or stiffness gain, but it did have a small effect on the strand bond ...

The compressive strength of recycled aggregate concrete was found to range between 18 and 65 MPa, and therefore a prediction equation is proposed for recycled aggregate concrete that considers the ratio and types of recycled coarse aggregates used. Keywords: concrete. Full Text References. Cited By. Related content. Effect of mixed recycled aggregates on mechanical properties of recycled ...

Aggregate (RA) on compressive strength of Recycled Aggregate Concrete (RAC) were investigated. RA is used to replace natural aggregate (NA) as coarse aggregate in concrete mixes. This research also covered RAC mixtures at different water-cement ratio (0.4, 0.5, 0.6). It was found that RAC had lower compressive strength compared to Natural Aggregate Concrete (NAC). At the age of 28

This paper deals with the possibility of using fresh concrete waste as recycled aggregates in concrete. An experimental program based on two variables (proportion of fine aggregates replacement and proportion of coarse aggregates replacement) was implemented. The proportions of replacement were 0%, 50%, and 100% by mass of aggregates.

The database has made it possible to analyse the different properties of recycled concrete aggregate (aggregate recycled from concrete waste), such as density, water absorption, Los Angeles coefficient, etc. Relationships between these properties and also between some of them and the compressive strength of recycled concrete have been established. This has provided a design methodology for ...

Compressive strength of mortar and concrete which used RCA gradually decreased as the amount of the recycled materials increased. Regardless of curing conditions and fly ash addition, the 28 days strength of the recycled aggregate concrete was greater than the design strength, 40 MPa, with a complete replacement of coarse aggregate and a replacement level of natural fine aggregate by fine

In terms of the use of recycled aggregate, the percentage of recycled aggregate should be determined because the strength of concrete would not be obtained by the high percentage of recycled aggregate.The scope of study is about comparison between recycle coarse aggregate and natural aggregate in terms of specific gravity, apparent specific gravity, absorption, los Angeles. Moreover,

The results show that the compressive strength of recycled aggregate concrete (RAC) decreases with the amounts of RCA generally increase of the replacement ratio on recycled aggregate in the same water-cement ratio. However, when the replacing 50% the natural coarse aggregate (NCA), the compressive strength of RAC appears to jump. Two-factor analysis is used to arrange the

On statistical characteristics of the compressive strength of recycled aggregate concrete

Compressive strength decreased with the increase in the recycled aggregate content, and a concrete mix with 40% recycled aggregate exhibited the best strength. Concrete mix with 30% recycled aggregate had the lowest chloride penetration after 2 weeks of saturation and performed better than a concrete mix with 100% natural aggregate. Owing to the lower density and higher water absorption of ...

Estimation of compressive strength of high-strength concrete with recycled aggregate using non-destructive test and numerical analysis Y S Cho1, S K Baek1, Y T Lee2, S H Kim2 and S U Hong*2 The purpose of the study is to provide reliable data on high-strength recycled aggregate concrete.. Know More. Influence of Surface. Influence of Surface-Treated Coarse Recycled Concrete Aggregate on ...

ABSTRACT: Compressive strength is the basic mechanical properties and one of the indicators to determine the performance of a concrete. In this paper, the effects of various percentages (0%, 25%, 50%, 75%, 100%) of Recycled Aggregate (RA) on compressive strength of Recycled Aggregate Concrete (RAC) were investigated. RA is used to

In order to explore the effect of RCA on the compressive strength of concrete, two RCAs from different sources are utilized to take experiments in this study. Four groups of concrete, including three RACs incorporated with various RCAs and another one made with natural aggregate (i.e. normal aggregate concrete (NAC)) are tested under an identical laboratory condition.

Results show that the measured 28‐day compressive strength of recycled aggregate concrete containing presoaked RCA is higher than that containing direct mixing of NS in concrete. The volume of permeable voids, water sorptivity, and chloride ion penetration measured after 28 days curing is also reduced in recycled aggregate concrete containing presoaked RCA in NS solution than that

With the increase in the use of recycled aggregate concrete (RAC), it is necessary to clearly understand its behavior and characteristics. In this paper, experimental study on compressive strength of RAC with same water/cement ratio is conducted. Firstly, influence of recycled coarse aggregate contents on cube compressive strength of RAC is studied.

Electric arc furnace (EAF) slag is a by-product of steel production in electric arc furnaces. Several studies have tried to demonstrate its suitability in civil engineering application, such as in bituminous mixtures and cement-based materials, due to its good physical, chemical and mineralogical properties. Particularly the re-use as coarse aggregate for concrete production has been shown to ...

ABSTRACT: Compressive strength is the basic mechanical properties and one of the indicators to determine the performance of a concrete. In this paper, the effects of various percentages (0%, 25%, 50%, 75%, 100%) of Recycled Aggregate (RA) on compressive strength of Recycled Aggregate Concrete (RAC) were investigated. RA is used to

In terms of the use of recycled aggregate, the percentage of recycled aggregate should be determined because the strength of concrete would not be obtained by the high percentage of recycled aggregate.The scope of study is about comparison between recycle coarse aggregate and natural aggregate in terms of specific gravity, apparent specific gravity, absorption, los Angeles. Moreover,

To apply those models, it was necessary to estimate before concrete density and compressive strength at 28 days, which is obtained with the expressions proposed by Thomas et al. : where the coefficients and depend on the recycled coarse aggregate substitution ratio and are listed in Table 2.

In order to explore the effect of RCA on the compressive strength of concrete, two RCAs from different sources are utilized to take experiments in this study. Four groups of concrete, including three RACs incorporated with various RCAs and another one made with natural aggregate (i.e. normal aggregate concrete (NAC)) are tested under an identical laboratory condition.

The results show that the compressive strength of recycled aggregate concrete (RAC) decreases with the amounts of RCA generally increase of the replacement ratio on recycled aggregate in the same water-cement ratio. However, when the replacing 50% the natural coarse aggregate (NCA), the compressive strength of RAC appears to jump. Two-factor analysis is used to arrange the

Results show that the measured 28‐day compressive strength of recycled aggregate concrete containing presoaked RCA is higher than that containing direct mixing of NS in concrete. The volume of permeable voids, water sorptivity, and chloride ion penetration measured after 28 days curing is also reduced in recycled aggregate concrete containing presoaked RCA in NS solution than that

Compressive strength and capillary water absorption tests were made after heating, and the experiments showed higher residual strength in concretes with the greatest content of recycled aggregates. However, a statistical analysis made with additional data available in the literature seemed to predict otherwise, and the recycled aggregate replacement would have a negative effect on the

This paper presents a proposed uniaxial damaged plastic constitutive relation of recycled aggregate concrete (RAC) based on the experimental studies. A total of five groups of RAC specimens with different recycled coarse aggregate (RCA) replacement percentages of 0, 25%, 50%, 75%, and 100%, respectively, are tested under both monotonic loading and cyclic loading.

23.04.2020 Compressive strength and capillary water absorption tests were made after heating, and the experiments showed higher residual strength in concretes with the greatest content of recycled aggregates. However, a statistical analysis made with additional data available in the literature seemed to predict otherwise, and the recycled aggregate replacement would have a negative effect on the

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