modification of recycled concrete aggregate by calcium
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Modification of recycled concrete aggregate by calcium ...

2012-9-1  ► Calcium carbonate biodeposition method contributed to decrease in water absorption of recycled concrete aggregate. ► Better efficiency was obtained for finer aggregate fraction and in the case of aggregate of lower quality. ► Efficiency of calcium chloride and whey as culture media was confirmed. ► Observations under SEM showed covering aggregate grains with calcium carbonate.

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Modification of recycled concrete aggregate by calcium ...

Request PDF Modification of recycled concrete aggregate by calcium carbonate biodeposition A growing demand for raw materials leads to danger of premature depletion of the natural sources. An ...

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Modification of recycled concrete aggregate by calcium ...

2013-3-4  Modification of recycled concrete aggregate by calcium carbonate biodeposition Anna M. Grabieca,⇑, Justyna Klamab, Daniel Zawala, Daria Krupaa a Department of Theory of Structures and Agricultural Building Engineering, Faculty of Land Reclamation and Environmental Engineering, University of Life Sciences, Poznan, Poland bDepartment of General and Environmental Microbiology,

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Surface treatment of recycled concrete aggregates

2014-4-30  Modification of recycled concrete aggregate by calcium carbonate biodeposition Constr Build Mater , 34 ( 2012 ) , pp. 145 - 150 Article Download PDF View Record in Scopus Google Scholar

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Enhancement of recycled aggregates and concrete by ...

2021-3-29  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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Reinforcement of Recycled Aggregate by Microbial

2021-7-30  adhered on the recycled aggregate surface, which leads to high water absorption and poor durability of the recycled concrete. Moreover, a more complex ITZ between the fresh mortar and the recycled aggregate was generated in the recycled concrete, as shown in Figure1[13]. Figure 1.

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Improving the properties of recycled concrete aggregate ...

2018-11-1  In this study, a new bio-deposition approach was used to improve the properties of recycled concrete aggregate (RCA). The new bio-deposition approach is based on bacterially induced CaCO 3 precipitation through respiration, which differs from the traditional bio-deposition treatment that produces CaCO 3 by urea hydrolysis. The experimental investigation was conducted in two parts.

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Reinforcement of Recycled Aggregate by Microbial

Recycled aggregate is aggregate prepared from construction waste. With the development of a global economy and people’s attention to sustainable development, recycled aggregate has shown advantages in replacing natural aggregate in the production of concrete due to its environmental friendliness, low energy consumption, and low cost. Recycled aggregate exhibits high water absorption and a ...

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Using microbial carbonate precipitation to improve the ...

2020-1-10  This study investigates the use of microbial carbonate precipitation (MCP) by Sporosarcina pasteurii (S. pasteurii) to improve the properties of recycled fine aggregate (RFA).The factors influencing MCP are experimentally investigated. The recommended precipitation conditions for the pH, bacteria concentration, and calcium concentration are determined to be 9.5, 10 8 cells/mL, and 0.55 mol/L ...

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Improvement in corrosion resistance of recycled aggregate ...

2020-2-1  This work modified recycled aggregates (RAs) by soaking them in a nano-silica (NS) suspension and evaluated the modification effects on recycled aggregate concrete (RAC). Firstly, different soaking times were studied based on the surface microhardness and the penetration depth of NS particles in the RA.

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Treatment Methods for the Quality Improvement of

2021-1-24  for the purpose of providing references for further research and practical application about the quality improvement of RCA, in this paper, various treatment methods were firstly classified into four categories: removing old mortar (OM), strengthening OM, multi-stage mixing methods, and combination methods. Thereafter, the improvement mechanisms and important conclusions of various treatment ...

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Reinforcement of Recycled Aggregate by Microbial

Recycled aggregate is aggregate prepared from construction waste. With the development of a global economy and people’s attention to sustainable development, recycled aggregate has shown advantages in replacing natural aggregate in the production of concrete due to its environmental friendliness, low energy consumption, and low cost. Recycled aggregate exhibits high water absorption and a ...

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Recycled aggregate mortar enhanced by microbial calcite ...

2020-5-20  Influence of recycled fine aggregate on microstructure and hardened properties of concrete Authors: Ravi Kumar , Subash Chandra Bose Gurram , Ashwani Kumar Minocha Source: Magazine of Concrete Research, Volume 69, Issue 24 , 1 Dec 2017 (1288–1295)

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Using microbial carbonate precipitation to improve the ...

2019-12-20  After bio-modification, industrial sourced recycled aggregates showed decreased water absorption and recycled aggregate concrete exhibited higher compressive strength. (3) After bio-modification, the enhancement in microhardness of interfacial transition zone, between new and old mortars, explained the improvement of compressive strength at the ...

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Effect of Surface Modifications of Recycled Concrete ...

The experiment aims to test the specific way of producing concrete with recycled concrete aggregate (RCA). To reduce its negative impact on the concrete properties, two different ways of treatment of the RCA with geopolymer slurry were applied—coating during the mixing using the specific mixing approach and coating prior to the mixing of concrete.

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Modifying recycled aggregate concrete by aggregate

The recycled aggregate is the well promising construction material for producing recycled aggregate concrete [24][25][26][27][28] [29] and has more other uses as well. Reportedly, recycled ...

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Modification of Lightweight Aggregate Concretes with ...

Lightweight concrete (LWC), according to the EN 206-1 [], is defined as having a density below 2000 kg/m 3.LWCs can be divided into six density classes, from 800 kg/m 3 with a grading of 200 kg upwards [].The use of lightweight aggregates for the production of concrete has many advantages [10,11,12].Some of these can particularly include a reduced dead load, high thermal efficiency, and ...

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Modification of Waste Aggregate PET for Improving the ...

2019-12-19  The slump value of plastic aggregate concrete (PAC) was found to be lower in the Ca (ClO)2-treated waste PET aggregates than the PET treated with H2O and H2O2. (ii) Concrete with PET satisfies the lightweight concrete density specification. The density of PAC reduced as the percentage of PET replacement increased.

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Microstructural analysis of recycled brick aggregate ...

2021-7-19  Microstructural analysis of recycled brick aggregate concrete modified by Structural Concrete ( IF 3.131) Pub Date : 2021-07-19, DOI: 10.1002/suco.202100144 Pei Ge, Wei Huang, Jiarui Zhang, Wenli Quan, Yuting Guo

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Performance of Recycled Aggregate Concrete

2009-9-1  aggregate concrete ,the slump test was about 1.0cm slump for 60 % coarse recycled aggregate concrete and increases as the percent of recycled aggregate decreases . The compressive strength of recycled aggregate concrete with 60 % recycled aggregate, is about 76 % of natural aggregate concrete. The compressive strength increases as the

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Recycled Aggregate in Concrete Production: A New

2017-12-19  Grabiec AM, Klama J, Zawal D, Krupa D (2012) Modification of recycled concrete aggregate by calcium carbonate biodeposition. Constr Build Mater 34(9):145–150 CrossRef Google Scholar Kou S, Zhan B, Poon CS (2012) Feasibility study of using recycled fresh concrete waste as coarse aggregates in concrete.

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Recycled aggregate mortar enhanced by microbial calcite ...

2020-5-20  The effects of calcium sources on bacterially induced MCP were investigated, and the efficiency of MCP for improving RFAs was evaluated in terms of physical and mechanical properties. Results show calcium chloride is an optimal calcium supplement that is useful for generating calcium carbonate, as compared with the effect of calcium nitrate.

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Effect of Surface Modifications of Recycled Concrete ...

The experiment aims to test the specific way of producing concrete with recycled concrete aggregate (RCA). To reduce its negative impact on the concrete properties, two different ways of treatment of the RCA with geopolymer slurry were applied—coating during the mixing using the specific mixing approach and coating prior to the mixing of concrete.

Get Price

Modifying recycled aggregate concrete by aggregate

The recycled aggregate is the well promising construction material for producing recycled aggregate concrete [24][25][26][27][28] [29] and has more other uses as well. Reportedly, recycled ...

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Use of Recycled Concrete Aggregate in High-Calcium Fly

The comparison results of using crushed limestone (NA) and recycled concrete aggregates (RCA) as coarse aggregates in high-calcium fly ash geopolymer concrete with and without temperature curing are presented. Local river sand with a fineness modulus of 2.1, sodium hydroxide solution concentrations of 8, 12, and 16 Molar, and sodium silicate were used to produce geopolymer concrete (GC).

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Use of RECYCLED AGGREGATES In CONCRETE- A

2021-8-19  The extensive research on recycled concrete aggregate and recycled aggregate concrete (RAC) as started from year 1945 in various part of the world after second world war, but in a fragmented manner. First effort has been made by Nixon in 1977 who complied all the work on recycled aggregate carried out between 1945-1977 and prepared a state-of ...

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Recycled Concrete Aggregate Crushed Concrete

2021-3-5  Recycled Concrete Aggregate is that the use of debris from dismantled concrete structures. utilization is cheaper and a lot of ecological than truckage debris to a lowland.. Crushed debris is often used for road gravel, revetments, holding walls, landscaping gravel, or staple for brand spanking new concrete. giant items are often used as bricks or slabs or incorporated with new concrete

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Enhancing the Properties of Recycled Aggregate

2015-5-20  curing of recycled aggregate Effects of carbonated RA on density of concrete 2,200 2,250 2,300 2,350 2,400 0 20 40 60 80 100 Density of cocnrete (Kg/m 3) Replacement of NRCA by volume (%) Non-carbonated New RCAs Carbonated New RCAs 2,240 2,260

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EFFECT OF CARBONATION TECHNOLOGY OF RECYCLED

2020-10-1  However, Ratio of recycled concrete production to Japanese concrete production is less than 0.1%. The reason is due to the quality of the recycled aggregate and the cost of manufacturing the aggregate. In order to solve this cause, we develop aggregate modification technology using

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Frost Resistance of Thermoinsulating Recycled-Aggregate ...

2020-12-17  Glazed hollow bead (GHB) is an innovative material that gives concrete very good thermal-insulation properties and improves concrete frost resistance, when used as a partial replacement of ordinary fine aggregate. The improvement in frost resistance under freeze-thaw cycles and the deterioration mechanisms of recycled aggregate thermoinsulating concretes (RATICs) is the objective

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