Quality improvement of mixed and ceramic recycled aggregates by biodeposition of calcium carbonate

García-González, Julia; Rodríguez-Robles, Desirée; Wang, Jianyun; Belie, Nele De; Pozo, Julia Mͣ Morán-del; Guerra‐Romero, M. Ignacio; Juan-Valdés, Andrés

doi:10.1016/j.conbuildmat.2017.08.039

Cited by 65 publications

(25 citation statements)

References 63 publications

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“…Quality improvements of mixed and ceramic recycled aggregates (RAs) obtained from construction demolition waste were studied by García-González et al using MICP treatments [ 78 ]. Ceramic RAs from different recycling plants were specially chosen by their ceramic composition as follows: TEC-REC (Tecnología y Reciclado S.L., Madrid-Spain, 33.6% ceramic), ANTWERP (Antwerp Recycling Company, Antwerp-Belgium, 38.4% ceramic), and BIERZO (Bierzo Recicla S.L., Leon-Spain, 97.9% ceramic) samples.…”

Section: Microbiologically Induced Carbonate Precipitation On Solimentioning

confidence: 99%

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Microbiologically Induced Carbonate Precipitation in the Restoration and Conservation of Cultural Heritage Materials

2020

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Microbiologically induced carbonate precipitation (MICP) is a well-known biogeochemical process that allows the formation of calcium carbonate deposits in the extracellular environment. The high concentration of carbonate and calcium ions on the bacterial surface, which serves as nucleation sites, promotes the calcium carbonate precipitation filling and binding deteriorated materials. Historic buildings and artwork, especially those present in open sites, are susceptible to enhanced weathering resulting from environmental agents, interaction with physical-chemical pollutants, and living organisms, among others. In this work, some published variations of a novel and ecological surface treatment of heritage structures based on MICP are presented and compared. This method has shown to be successful as a restoration, consolidation, and conservation tool for improvement of mechanical properties and prevention of unwanted gas and fluid migration from historical materials. The treatment has revealed best results on porous media matrixes; nevertheless, it can also be applied on soil, marble, concrete, clay, rocks, and limestone. MICP is proposed as a potentially safe and powerful procedure for efficient conservation of worldwide heritage structures.

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Section: Microbiologically Induced Carbonate Precipitation On Solimentioning

confidence: 99%

“… SEM images of ( a ) CaCO 3 precipitated over recycled aggregates surface, ( b ) CaCO 3 precipitated inside a pore of recycled aggregates (RA) sample, ( c ) CaCO 3 globular precipitate with Energy-dispersive X-ray spectroscopy (EDX) spectrum showing the composition of the precipitate. Adapted with permission from [ 78 ] 2017, Elsevier. …”

Section: Figurementioning

confidence: 99%

Microbiologically Induced Carbonate Precipitation in the Restoration and Conservation of Cultural Heritage Materials

2020

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“…It is widely known that said recycled materials, due to their own nature, present a higher coefficient of water absorption than their natural counterparts. This absorption can be alleviated by various methods, including pre-saturation [46] or the bio deposition of calcium carbonate [47], among others. There are even international reference guides and standards for the use of CRCA in the production of concrete with some notable differences between some countries and others [14,[48][49][50][51].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Mechanical Characteristics of Cement Mortar with Fine Recycled Concrete Aggregates (FRCA)

et al. 2021

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One of the growing demands in concrete manufacture is the availability of natural fine aggregates, which account for 35% to 45% of the total concrete. An alternative method of disposal of fine recycled concrete aggregates (FRCA) generated from demolition and construction waste (C&DW) is their usage in mortar and the development of recycled mortar. The main aim of this research work is to evaluate the viability of incorporating FRCA from urban C&DW for the manufacture of cement-based mortars. Simple processing techniques like washing and sieving are adopted to improve the FRCA quality. Physical and chemical characterization of ingredients is carried out. In total four mixes of 1:3 (cement: sand) mortar with partial replacement of normalized sand with FRCA (0%, 25%, 50%, and 100%) are evaluated for mechanical properties. Water to cement ratio for all four mortar mixes are determined by fixed consistency. Mechanical and physical properties like density, compressive strength, and flexural strength are studied for various curing periods, and the result is that the optimum usage of FRCA is 25% based on a 90-day curing period.

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“…Currently, researchers are mainly focused on the bio-deposition in concrete cracks [26,27,28,29]. For RCA, this method is based on the ability of bacteria to induce calcium carbonate deposition in a calcium-rich environment to fill or bind micro-cracks of RCA [30,31,32,33,34]. In the past, ureolytic bacteria were most commonly applied by researchers; this involved decomposition of CO(NH 2 ) 2 into CO 3 2− and NH 4 + and then precipitation of CaCO 3 in a calcium-rich environment.…”

Section: Introductionmentioning

confidence: 99%

Properties of Concrete Prepared with Recycled Aggregates Treated by Bio-Deposition Adding Oxygen Release Compound

Zhu

et al. 2019

Materials

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Recycled aggregates have high water absorption and crushing index. In order to improve the properties of recycled aggregates in concrete production, various treatments were used to modify the aggregates. In recent years, bio-deposition as a new treatment method of recycled aggregates was environmentally friendly. An improved method of bio-deposition was implemented to modify the properties of recycled mortar aggregates (RMA). O-bio-deposition is based on aerobic bacteria induced CaCO3 precipitation by respiration by varying the distance between the RMA and the bottom of the container and by adding an oxygen release compound to the culture solution that contains bacteria to promote the induction of CaCO3. First, the physical properties, including water absorption, crushing value, and apparent density, of the coarse RMA under different treatment methods were determined, and an o-bio-deposition treatment method was obtained. The fine RMA was treated and compared with the untreated RMA. Concretes were then prepared from the treated coarse RMA, and compressive strength and slump were determined. In addition, the effect of the o-bio-deposition treatment on the RMA surface and the micro-cracks of concretes were observed by scanning electron microscopy (SEM). It was found that the water absorption and crushing index of the coarse RMA treated by o-bio-deposition were reduced by 40.38 and 19.76% compared with untreated RMA, respectively. Regarding the concrete, the slump and the compressive strength (28 d) of concrete were increased by 115% and 25.3%, respectively compared with the untreated concrete.

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Quality improvement of mixed and ceramic recycled aggregates by biodeposition of calcium carbonate

Cited by 65 publications

References 63 publications

Microbiologically Induced Carbonate Precipitation in the Restoration and Conservation of Cultural Heritage Materials

Microbiologically Induced Carbonate Precipitation in the Restoration and Conservation of Cultural Heritage Materials

Evaluation of Mechanical Characteristics of Cement Mortar with Fine Recycled Concrete Aggregates (FRCA)

Properties of Concrete Prepared with Recycled Aggregates Treated by Bio-Deposition Adding Oxygen Release Compound

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