Experimental analysis of properties of recycled coarse aggregate (RCA) concrete with mineral additives

Çakır, Özgür

doi:10.1016/j.conbuildmat.2014.06.032

Cited by 228 publications

(86 citation statements)

References 44 publications

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“…After 90 days, the splitting tensile values ranged between 8% and 10% for concretes containing SCMs, which is almost similar to NAC mix with 8%. These results are comparable with the results published by Çakır (2014) [60] with values ranged from 7.7-11.4% for RA concrete with mineral additives, such as silica fume and GGBS. In addition, the results indicated that the ratio between splitting tensile strength and compressive strength decreases when the compressive strength increases.…”

Section: Splitting Tensile Strengthsupporting

confidence: 82%

“…After 90 days, the splitting tensile values ranged between 8% and 10% for concretes containing SCMs, which is almost similar to NAC mix with 8%. These results are comparable with the results published by Çakır (2014) [60] with values ranged Generally, the results at the age of 28 days showed that the ratio between splitting tensile strength and compressive strength for NAC is about 8%, while for concretes containing RA and SCMs, it was in the range between 9% and 11%. After 90 days, the splitting tensile values ranged between 8% and 10% for concretes containing SCMs, which is almost similar to NAC mix with 8%.…”

Section: Splitting Tensile Strengthsupporting

confidence: 82%

“…Figure 16 shows the splitting tensile strength of RA concretes as a function of the compressive strength and compared to the reference equation suggested by ACI 318-14 [61] for normal concrete and the equation suggested by Çakır (2014) [60] on the utilization of RA concrete with mineral additives, i.e., silica fume and GGBS as SCMs. It can be seen that the splitting tensile strength obtained from this study for RA concrete blended with RHA, POFA and POCP is lower than that of the values proposed by ACI 318-14 [61]; however, closer values were obtained from the equations proposed by Çakır (2014) [60]. Generally, the results at the age of 28 days showed that the ratio between splitting tensile strength and compressive strength for NAC is about 8%, while for concretes containing RA and SCMs, it was in the range between 9% and 11%.…”

Section: Splitting Tensile Strengthmentioning

confidence: 99%

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Evaluation of Industrial By-Products as Sustainable Pozzolanic Materials in Recycled Aggregate Concrete

et al. 2017

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Abstract:The utilization of traditional supplementary cementitious materials (SCMs) has become more intense in the concrete industry due to their better long-term properties. This research evaluates the fresh and hardened properties of concrete that was developed using a high amount of recycled aggregate (RA) incorporated with sustainable SCMs. Rice husk ash (RHA), palm oil fuel ash (POFA) and palm oil clinker powder (POCP) were used as SCMs at 10%, 20% and 30% cement replacement levels to investigate their positive role in the performance of RA concrete. The results showed that the 10% replacement level of cement by RHA produced the highest strength at all ages tested. Although POFA and POCP were found to negatively affect the strengths at an early age, the hardened properties showed improvement after a relatively long curing time of 90 days. In addition, the targeted compressive strength of 30 MPa was achieved by using SCMs at levels up to 30%. Overall, the sustainable SCMs can reduce the quantity of cement required for concrete production, as well as reduce the conventional cement with the industrial by-products, which are considered as waste materials; thus, the concrete produced using up to 30% of SCMs as a replacement for cement could be considered as more environmentally-friendly concrete.

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Section: Splitting Tensile Strengthsupporting

confidence: 82%

“…After 90 days, the splitting tensile values ranged between 8% and 10% for concretes containing SCMs, which is almost similar to NAC mix with 8%. These results are comparable with the results published by Çakır (2014) [60] with values ranged Generally, the results at the age of 28 days showed that the ratio between splitting tensile strength and compressive strength for NAC is about 8%, while for concretes containing RA and SCMs, it was in the range between 9% and 11%. After 90 days, the splitting tensile values ranged between 8% and 10% for concretes containing SCMs, which is almost similar to NAC mix with 8%.…”

Section: Splitting Tensile Strengthsupporting

confidence: 82%

Section: Splitting Tensile Strengthmentioning

confidence: 99%

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Evaluation of Industrial By-Products as Sustainable Pozzolanic Materials in Recycled Aggregate Concrete

et al. 2017

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“…In general, RCA contains 65-70% of natural aggregate (coarse and fine) and 30-35% of cement paste by volume (Kong 2010)[16]. concrete strength decreases when RA is used and the strength reduction could be as low as 40% [4,16].The use of recycled aggregate generally increases the drying shrinkage, creep and water sorptivity and decreases the compressive strength and modulus of elasticity of recycled aggregate concrete compared to those of natural aggregate concrete [2]. The poor performance of the recycled aggregate concrete is associated with the cracks and fissures, which were formed in recycled aggregate during processing, thereby rendering the aggregate having weaker and more susceptible to permeation, diffusion and absorption of fluids [4,2].…”

Section: Imentioning

confidence: 99%

Strength and Durability Study of Concrete using Recycled Aggregates along with Silica Fume - A Critical Review

Mehbub¹

2018

IJRASET

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To support the goal of "SAVE ENVIRONMENT", today's need is to use recycled materials as maximum as possible. As Concrete is the most demanded material after water in present developing countries. There is need of present globe to find the alternative materials for ingredients of concrete which can replace natural ingredients especially aggregates. Earlier researchers have presented good results of concrete using recycled coarse aggregates. Here an attempt will be made to prepare concrete using recycled coarse aggregates as well as fine aggregates. Replacement will be carried out in percentages of 0,10,20,30 and 40. Silica fumes will also used to improve the properties of the said concrete. Concrete will be prepared with and without silica fume to avail detailed comparative analysis. Proposed work will be helpful for the present as well as future research work. Keywords: Cement Recycled Finr Aggregate Recycled Coarse Aggregare, Silica Fume I.INTRODUCTION Concrete is widely used construction material all over the world for various types of structures due to its strength and stability. The ingredients of concrete like cement, fine aggregates and coarse aggregates plays an important role in the strength and durability of structures. The ordinary Portland cement is one of the main ingredients used for production of cement causes various environmental problems involves emission of large amount of CO2 gas into the atmosphere, a major contribution for greenhouse effect and global warming. So to reduce these problems we use the supplementary cementations materials like fly ash, silica fume, ground granulated blast furnace slag, rice husk ash, metakaolin as a partial replacement material of cement. A number of studies are going on in India and other countries to study the effect of these materials as replacement materials. Silica fume is a mineral admixture and a very reactive pozzolan and it causes high strength and durability. Silica fume a byproduct of producing silicon metal or ferrosilicon alloys [1]. Coarse aggregates are the major ingredient of concrete and play an also important role in strength of concrete. But due to increase in population in India, the requirements of natural aggregates are not only required to fulfill the demand for the upcoming projects, but also are the needs of the extensive repairs or replacements required for existing infrastructure. So to reduce burden on natural resources, we can easily use recycled concrete aggregates which are easily available from demolished buildings or structures [1]. Furthermore, sustainable waste management is another major issue faced by countries all over the world. In order to minimize the environmental impact and energy consistency of concrete used for construction facilities, reuse of construction and demolition (C&D) wastes can be a beneficial way which leads sustainable engineering. approaches to concrete mix design [8].To achieve this, major emphasis must be laid on the use of wastes and byproducts in cement and concrete used for new constructio...

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“…Especially procurement of these natural materials extremely modifies the natural sources and creates major environmental problems [1][2]. Taking the construction industry as an example, every year 15 billion tonnes of concrete are produced throughout the world that means 2 tonnes of concrete per inhabitant per year [3].…”

Section: Introductionmentioning

confidence: 99%

Two-factor Analysis on Compressive Strength of Recycled Aggregate Concrete

Yan¹,

Yong-tao²

2017

Proceedings of the 2016 International Conference on Architectural Engineering and Civil Engineering

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Abstract-Recycled coarse aggregate (RCA) was obtained from waste samples of C30 in the laboratory through crushing, washing and screening and cube compressive strength test was conducted on RCA concrete under different conditions. 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 experiment by taking a full consideration of the factors which have effect on the compressive strength, such as water-cement ratio, coarse aggregate replacement ratio, and the interaction between water-cement ratio and replacement ratio. The analysis of variance is established and is used to analyze the influence rate of the compressive strength. It also shows that main factor which affects the compressive strength is coarse aggregate replacement ratio and the interaction function on the watercement and replacement ratio cannot be ignored. The study offers a valuable reference to the design of recycled concrete. This electronic document is a "live" template. The various components of your paper [title, text, heads, etc.] are already defined on the style sheet, as illustrated by the portions given in this document.

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Experimental analysis of properties of recycled coarse aggregate (RCA) concrete with mineral additives

Cited by 228 publications

References 44 publications

Evaluation of Industrial By-Products as Sustainable Pozzolanic Materials in Recycled Aggregate Concrete

Evaluation of Industrial By-Products as Sustainable Pozzolanic Materials in Recycled Aggregate Concrete

Strength and Durability Study of Concrete using Recycled Aggregates along with Silica Fume - A Critical Review

Two-factor Analysis on Compressive Strength of Recycled Aggregate Concrete

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