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Enhancement of recycled aggregates and concrete by ...

Mar 29, 2021  Performance enhancement of recycled concrete aggregate – a review J. Cleaner Prod. , 112 ( 2016 ) , pp. 466 - 472 , 10.1016/j.jclepro.2015.08.057 Article Download PDF View Record in

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Enhancement of recycled aggregates and concrete by ...

Accelerated carbonation, regarded as one of the sustainable and economical methods for enhancing recycled concrete aggregates (RCAs), has a potential to be further enhanced through pretreating the RCA with Ca 2+ rich solutions before carbonation as the externally provided Ca 2+ was expected to yield more precipitation of calcium carbonate in the pores.

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Enhancement of recycled aggregate properties by ...

May 01, 2018  Strengthening the attached old cement mortar of recycled concrete aggregate (RCA) is a common approach to enhance the RCA properties. Accelerated CO 2 curing has been regarded as an alternative way to enhance the properties of RA. However, the improvement of the properties of RCA was limited by the shortage of reactive components in the old cement mortar available for the carbonation reactions.

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Enhancement of recycled aggregate concrete properties by a ...

However, using recycled concrete aggregate (RCA) in concrete involves various obstacles and controversial issues in controlling the quality of recycled aggregate concrete (RAC). This study is an effort to improve the quality of RAC containing 100% coarse RCA by using pozzolanic and sodium silicate solution as

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Enhancement of recycled aggregate concrete properties by a ...

The quality of Recycled Aggregate (RA) concrete having 100% coarse RCA got improved by using pozzolanic and sodium silicate solution as new treatment solutions. At 20% concentration of sodium ...

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Enhancement of recycled aggregate properties by ...

As replacing natural aggregates (NA) with recycled concrete aggregates (RCA) would lead to inferior new concrete properties, enhancement approaches are usually adopted when incorporating RCA in ...

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Performance enhancement of recycled concrete

Jan 20, 2016  Recycled concrete aggregate differ from natural aggregate as the former contains hardened cement mortar. The adhered cement mortar on recycled concrete aggregate has higher porosity and water absorption and lower strength than natural aggregate do. ... Performance enhancement of recycled concrete aggregates through carbonation. J. Mater. Civ ...

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Flexural strength enhancement of recycled aggregate ...

Aug 01, 2021  Using recycled materials is a new method to manufacture reinforced concrete (RC) elements in civil engineering. Recycled materials come from different sources such as old buildings demolition, glass waste, stone powder, among others. These materials could be

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Enhancement of properties of recycled coarse aggregate ...

4.4 Properties of fine and recycled coarse aggregate Locally available sand (fine aggregate) conforming to IS: 383-1970 [46] is collected from a nearby river and used in the present study. For recycled coarse aggregate, the parent concrete is crushed through a mini jaw crusher maintaining the

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Performance Enhancement of Recycled Concrete Aggregates ...

Nov 11, 2015  The cement paste attached to natural aggregates has a significant effect on the quality of recycled concrete aggregates (RCAs) because it usually has higher porosity and lower strength than natural aggregates. This work attempted to improve the quality of RCAs through carbonation of

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Enhancement of recycled aggregates and concrete by ...

Enhancement of recycled aggregates and concrete by combined treatment of spraying Ca 2+ rich wastewater and flow-through carbonation. / Fang, Xiaoliang; Zhan, Baojian; Poon, Chi Sun. In: Construction and Building Materials, Vol. 277, 122202, 29.03.2021. Research output: Journal article publication › Journal article › Academic research ...

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Enhancement of recycled aggregate properties by ...

As replacing natural aggregates (NA) with recycled concrete aggregates (RCA) would lead to inferior new concrete properties, enhancement approaches are usually adopted when incorporating RCA in ...

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Enhancement Treatment of Recycled Concrete Aggregate

Jul 22, 2021  Aggregate is an essential component in concrete, occupying 60–70% of the concrete by volume. Nevertheless, the application of natural aggregate (NA) is restricted due to the finite resources and long regeneration period. Recycled concrete aggregate (RCA), as common CD waste, has received widespread attention for its usage to replace NA.

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Performance Enhancement of Recycled Concrete Aggregates ...

Nov 11, 2015  The cement paste attached to natural aggregates has a significant effect on the quality of recycled concrete aggregates (RCAs) because it usually has higher porosity and lower strength than natural aggregates. This work attempted to improve the quality of RCAs through carbonation of

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Performance enhancement of recycled concrete aggregate-A ...

The utilization of recycled aggregate (RA) in concrete is one such attempt. Generally, use of RA is restricted to lower grade applications because of its strength and durability problems. The use ...

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Enhancement of properties of recycled coarse aggregate ...

Due to rapid construction, necessity for raw materials of concrete, especially coarse aggregate, tends to increase the danger of early exhaustion of the natural resources. An alternative source of raw materials would perhaps delay the advent of this early exhaustion. Recycled coarse aggregate (RCA) plays a great role as an alternative raw material that can replace the natural coarse aggregate ...

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Performance Enhancement of Permeable Asphalt Mixtures

The incorporation of recycled concrete aggregate (RCA) in permeable asphalt mixtures (PAMs) is an efficient method of utilizing construction demolished waste. Keywords: recycled concrete aggregate, permeable asphalt mixture, permeability, pavement, enhancement Created Date: 9/14/2020 3:52:59 PM

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Chemico-thermal treatment for quality enhancement of ...

May 29, 2019  Utilization of recycled concrete fine aggregates to full potential in the construction sector is necessary to increase the ecological value and solves the issues of natural sand scarcity. However, the quality of recycled concrete fine aggregates is inferior to conventional aggregates. Hence, a treatment process is obviously essential for improving the quality of recycled concrete fine ...

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Fast enhancement of recycled fine aggregates properties by ...

Accelerated carbonation for recycled concrete aggregate (RCA) was one of the effective and economic solutions for improving the quality of RCA and its concrete products. Previously, a fast wet carbonation method was developed and proved to be effective for property enhancement of the coarse fraction of RCA by transforming the carbonation ...

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Frontiers Performance Enhancement of Permeable Asphalt ...

Sep 16, 2020  The incorporation of recycled concrete aggregate (RCA) in permeable asphalt mixtures (PAMs) is an efficient method of utilizing construction demolished waste. It not only conforms to the trend of building sponge cities, but also alleviates the problem of overexploitation of natural aggregate resources. As the performance of PAM containing recycled aggregate is not comparable to natural ...

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Effect of Chemical Enhancing-Technology on the Properties ...

Jul 31, 2020  Strengthening the attached old cement mortar of recycled aggregate (RA) is a common approach to enhance the RA properties. In this study, four representative chemical enhancing-technologies were chosen. Through the analysis of physical properties, mechanical properties, and shape indexes, the changes of performance before and after strengthening were tested, so as to grasp the influence of ...

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Critical Review of Recycled Aggregate Concrete Properties ...

Nov 11, 2020  Although the properties of recycled aggregate concrete are widely considered to be inferior to those of natural aggregate concrete, research in the field still is of merit due to growing awareness of environmental concerns relating to the concrete construction and demolition industry. In addition, some methods have been proposed to improve the ...

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Mechanical Performance of Concrete Made with Recycled ...

This research aims at analysing the mechanical performance of concrete with recycled aggregates from concrete pavements. First, the characteristics of various natural and recycled aggregates used in the concrete were thoroughly analysed. The composition of the recycled aggregates was determined and several physical and chemical tests of the aggregates were performed.

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Fatigue performance enhancement and high-temperature ...

Hou et al. designed the asphalt stabilized base ATB-25 with recycled concrete aggregate (RCA) and pretreated it with three kinds of activators. The results show that the residual Marshall stability, tensile strength ratio and low temperature bending strain of ATB decrease as the increase of the RCA content.

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Enhancement of properties of recycled coarse aggregate ...

Recycled coarse aggregate Concrete that has been removed is often seen as worthless and dumped as demolition material after the destruction of ancient roadways and structures. Used concrete aggregates (RCAs) are created by removing old concrete from the ground and breaking it down (Fig 1).

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Enhancing the quality of recycled coarse aggregates by ...

The compressive strength of fully recycled aggregate concrete increased most obviously, and the 28d compressive strength of fully recycled concrete with 7% nano metakaolin increased by 27.1%.

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Fast enhancement of recycled fine aggregates properties by ...

Accelerated carbonation for recycled concrete aggregate (RCA) was one of the effective and economic solutions for improving the quality of RCA and its concrete products. Previously, a fast wet carbonation method was developed and proved to be effective for property enhancement of the coarse fraction of RCA by transforming the carbonation ...

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Enhancement of properties of recycled coarse aggregate ...

Enhancement of properties of recycled coarse aggregate concrete using bacteria. Due to rapid construction, necessity for raw materials of concrete, especially coarse aggregate, tends to increase the danger of early exhaustion of the natural resources. An alternative source of raw materials would perhaps delay the advent of this early exhaustion.

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Performance Enhancement of Permeable Asphalt Mixtures

The incorporation of recycled concrete aggregate (RCA) in permeable asphalt mixtures (PAMs) is an efficient method of utilizing construction demolished waste. Keywords: recycled concrete aggregate, permeable asphalt mixture, permeability, pavement, enhancement Created Date: 9/14/2020 3:52:59 PM

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Evaluation on the Mechanical Performance of Low-Quality ...

recycled aggregates in order to expand the distribution of recycled aggregates generated from concrete waste in Japan, and there have been advances in the recycling system for concrete (Choi et al. 2012). However, low-quality recycled aggregates manufactured by simple processing is a major cause of reduced concrete performance, and low quality is

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A Study on the Properties of Recycled Aggregate Concrete ...

aggregate fine powder, and impurities. The characteristics of concrete using a recycled aggregate type and ratio were studied. 2. Scope and Method of Research In this research, the quality improvement of the recycled fine aggregate and the characteristics of concrete using

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Critical Review of Recycled Aggregate Concrete Properties ...

Nov 11, 2020  Although the properties of recycled aggregate concrete are widely considered to be inferior to those of natural aggregate concrete, research in the field still is of merit due to growing awareness of environmental concerns relating to the concrete construction and demolition industry. In addition, some methods have been proposed to improve the ...

Get Price

Effect of Chemical Enhancing-Technology on the Properties ...

Jul 31, 2020  Strengthening the attached old cement mortar of recycled aggregate (RA) is a common approach to enhance the RA properties. In this study, four representative chemical enhancing-technologies were chosen. Through the analysis of physical properties, mechanical properties, and shape indexes, the changes of performance before and after strengthening were tested, so as to grasp the influence of ...

Get Price

Mechanical Performance of Concrete Made with Recycled ...

This research aims at analysing the mechanical performance of concrete with recycled aggregates from concrete pavements. First, the characteristics of various natural and recycled aggregates used in the concrete were thoroughly analysed. The composition of the recycled aggregates was determined and several physical and chemical tests of the aggregates were performed.

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MICROBIAL CARBONATE PRECIPITATION IN RECYCLED

Aggregates to be used to see the effects that recycled aggregates makes on the strength of the concrete as we can derive from the Literature review that we can replace the Natural Aggregates by Waste concrete aggregates to between 20%-30% and it won’t make any effect on the strength of concrete.

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First Graphene Ltd. Technical Article GRAPHENE ENHANCED ...

Recycled Aggregate Concrete (RAC) was investigated. PureGRAPH® graphene concrete additives were dispersed with superplasticiser in water to prepare a cement mortar and then RAC concrete prepared. An enhancement in RAC performance was achieved by washing the recycled aggregate and doping the cement mortar with 0.01%w/w of PureGRAPH®

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Mechanical Properties and ITZ Microstructure of Recycled ...

Jun 18, 2018  SHI C, LI Y, ZHANG J, et al. Performance Enhancement of Recycled Concrete Aggregate–A Review[J]. Journal of Cleaner Production, 2016, 112: 466–472. Article Google Scholar [7] KOU S C, ZHAN B J, POON C S. Use of a CO 2 Curing Step to Improve the Properties of Concrete Prepared with Recycled Aggregates[J]. Cement and Concrete ...

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A review of experimental results on structural performance ...

Jun 30, 2020  (2018) Properties enhancement of recycled aggregate concrete through pretreatment of coarse aggregates—comparative assessment of assorted techniques. Journal

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