Modified recycled concrete aggregates for asphalt mixture using microbial calcite precipitation

Pan, Zhong-Yao; Li, Gengying; Hong, Chengyu; Kuang, Hui-Ling; Yu, Yu; Feng, Fo-Xiong; Liu, Dongming; Du, Hong

doi:10.1039/c5ra04203h

Cited by 35 publications

(8 citation statements)

References 50 publications

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“…al. (Pan et al 2015) confirm this statement. (IV) By chemically changing the acidic and basic components of the aggregate, the calcium carbonate coating increases the cohesion between the cationic bitumen (an acidic material) and aggregate.…”

Section: Discussionmentioning

confidence: 53%

“…This method is intended to evaluate the potential of medium culture containing bacteria and urea-CaCl2 nutrient solution in creating lime depositions for improving CMA's mechanical properties. Different methods have been introduced for bio-deposition treatment of the aggregates' surfaces in the literature (Pan et al 2015, García-González et al 2017. Aggregates passing the No.…”

Section: Bio-deposition Treatmentmentioning

confidence: 99%

“…Pan et al studied the effects of Microbial carbonate precipitation (MCP) on direct tensile strength between two concrete specimens, attached by an asphalt layer. They observed that the treated specimens shows good adhesion between asphalt and the specimens' surfaces compared with the control specimens (Pan et al 2015). In another study, the effects of MCP on the adhesion between the concrete substrate and the repair materials was investigated employing a slant shear test.…”

Section: Introductionmentioning

confidence: 99%

“…Results show that the CaCO3 precipitations fills the pores in porous aggregates, therefore, water absorption and compressive strength of concrete with treated aggregates will increase (García-González et al 2017. In recent years, utilization of MCP for filling concrete cracks (Wang et al 2016), soil consolidation (Al-Thawadi 2011, and also, improving the adhesion between asphalt and aggregates (Pan et al 2015) has drawn the interest of researchers. In this method, CaCO3-producing-bacteria and proper bacteria nutrition are utilized for precipitation purpose.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Investigation of the mechanical and physical properties of bio-modified cold asphalt emulsion mixtures by microbial carbonate precipitation

Dovom

Moghaddam

Karrabi

et al. 2019

International Journal of Pavement Engineering

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In this study, the effects of Microbial Carbonate Precipitation (MCP), on physical and mechanical properties of Cold Asphalt Emulsion Mixtures (CAEMs) have been investigated. MCP method was performed on CAEMs by two scenarios: (I) Bio-deposition treatment of aggregates and, (II) using a medium culture containing bacteria and urea-CaCl2 nutrient solution as a replacement for optimum water content, in the manufacturing process. Additionally, in the second scenario, the effect of different curing durations (7, 14, 28 and 56 days) on the mixtures' properties has been examined. In order to ensure the formation of CaCO3 precipitation on the aggregates (first scenario), X-Ray Diffraction and Fourier-Transform Infrared Spectroscopy tests were used. Atomic Force Microscopy and FE-SEM technique were also employed to evaluate the micro-roughness of aggregates' surface and the effect of MCP on the structure of CAEMs, respectively. Ultrasonic Pulse Velocity, Indirect Tensile Strength and Semi-Circular Bending tests were performed to investigate the mechanical properties of the CAEMs. In order to assess the significance of the tests' results, analysis of variance (ANOVA) was done at 95% confidence level. Results indicated that the CaCO3 precipitations are formed on the aggregates, and also, the roughness is increased on the surface of treated aggregates. The weight increase in samples fabricated by both treatment scenarios was confirmed the formation of CaCO3 precipitations, as well. The CAEMs of first scenario revealed significantly higher dynamic modulus, indirect tensile strength, fracture energy and resistance to crack propagation, compared with the control mixtures. Significant improvements were also observed in the mechanical properties of CAEMs of second scenario after 28 days of curing, but this improvement is still lower than that of the CAEMs of first scenario. Findings revealed that MCP method can significantly improve the mechanical properties of cold asphalt mixtures. But, it doesn't significantly affect their physical properties.

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Section: Discussionmentioning

confidence: 53%

Section: Bio-deposition Treatmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Investigation of the mechanical and physical properties of bio-modified cold asphalt emulsion mixtures by microbial carbonate precipitation

Dovom

Moghaddam

Karrabi

et al. 2019

International Journal of Pavement Engineering

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“…RAC được sử dụng trong nghiên cứu này được lấy từ một tòa nhà bê tông gạch đã bị phá hủy. Thành phần của RAC bao gồm vữa cũ, gạch, bê tông tổng hợp… Trong đó, gạch và vữa cũ được chọn làm vật mang vi khuẩn do cấu trúc xốp, phù hợp với sự bám dính của vi khuẩn trong quá trình xử lý MICP [23,24]. Cốt liệu được sàng lọc trước để loại bỏ các hạt nhỏ hơn 0,6 mm và được giữ ở điều kiện khô ráo để đạt được khả năng hấp thụ dịch vi khuẩn tốt hơn [25].…”

Section: Vật Liệu Và Hóa Chấtunclassified

Đánh Giá Khả Năng Xử Lý Tính Thấm Đối Với Cốt Liệu Bê Tông Cũ Của Vi Khuẩn Tạo Kết Tủa Calcite Phân Lập Tại Việt Nam

Kiên,

Đào,

Loan

et al. 2024

HUIT_OJS

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Kết tủa calcite do vi sinh vật (Microbially Induced Carbonate Precipitation - MICP) là một hướng tiếp cận mới cho các ứng dụng thực tiễn. Mục tiêu nhằm cải thiện tính chất của cốt liệu bê tông cũ (Recycled Aggregate Concrete - RAC), tái sử dụng cũng như giải quyết các vấn đề nghiêm trọng mang tính toàn cầu như thảm họa chất thải xây dựng và các vấn đề ô nhiễm môi trường ngày càng tăng. Trong nghiên cứu này, trọng tâm chính là đánh giá khả năng xử lý tính thấm đối với cốt liệu bê tông cũ RAC của vi sinh vật, chủ yếu là quy trình xử lý MICP theo con đường thủy phân urease nhằm nâng cao chất lượng và tính ứng dụng của RAC. Đồng thời, xác định tính hiệu quả của quy trình xử lý MICP được đề xuất và đánh giá mức độ cải thiện đặc tính xử lý tính thấm của cốt liệu tái chế. Sau khi thực hiện quy trình xử lý MICP, bổ sung nguồn Ca2 , lặp lại 3 chu kỳ với thời gian xử lý mỗi chu kỳ là 24 giờ, đánh giá cấu trúc lỗ rỗng với cấp độ vi mô. Kết quả cho thấy, hoạt tính enzyme urease tỷ lệ thuận với khả năng tạo kết tủa calcite, tương quan với khả năng cải thiện tính thấm của chủng vi khuẩn Bacillus thuringiensis QN_7 (B. thuringiensis QN_7) với RAC thông qua sự tăng về khối lượng 13,04% và làm giảm tính thấm nước 43,15% so với mẫu đối chứng.

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Effects of bacterial consortium enhanced recycled coarse aggregates on self‐healing concrete immobilized with Bacillus megaterium MTCC 1684 and Bacillus subtilis NCIM 2193

Bakr,

Hussain,

Singh

et al. 2023

Structural Concrete

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The strength and durability properties of the recycled aggregate concrete (RAC) have been affected by the cracks and the weak interfacial transition zone (ITZ) of the recycled coarse aggregates (RCA). However, the mechanical and physical features of RCA can be improved by microbially induced calcite precipitation (MICP). Therefore, immobilization techniques were used to protect and maintain the high efficiency of Bacillus bacteria for the formation and precipitation of calcium carbonates in self‐healing concrete over a period of time. The objective of the present study was to show the viability of the immobilized bacterial consortium‐enhanced RCA to form self‐healing cracks. Further, the self‐healing capability of enhanced RCA was investigated along with two other immobilization methods, that is, RCA and hydrated lime and brick powder (HBr)‐immobilized bacteria. The experimental results show that the increase in the bio‐deposition time improved the physical and mechanical properties of the RCA. Further, subsequently 56 days of the healing incubation period, the immobilized consortium‐enhanced RCA concrete specimens completely healed the cracks of width 0.58 mm. However, the equivalent cracks of width 0.56 mm were also recovered by the HBr immobilized bacterial cultures. Furthermore, the field emission scanning electron microscope (FESEM), energy dispersive spectroscopy (EDS) and X‐ray diffraction (XRD) analysis revealed that the existence of precipitation at the crack surface was calcium carbonate with a regular cubic‐shaped and lamellar layer morphology. The outcomes of the current study show that consortium‐enhanced RCA has promising potential to develop self‐healing concrete with self‐repaired and improved durability properties in the concrete construction field.

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Modified recycled concrete aggregates for asphalt mixture using microbial calcite precipitation

Abstract: Recycled concrete aggregate (RCA) was pretreated by microbial calcite precipitation. The surface treatment reduced the porosity and permeability of RCA by 32% and 86.5%, respectively. The treatment improved the bonding strength of RCA–asphalt binder by 55%.

Cited by 35 publications

References 50 publications

Investigation of the mechanical and physical properties of bio-modified cold asphalt emulsion mixtures by microbial carbonate precipitation

Investigation of the mechanical and physical properties of bio-modified cold asphalt emulsion mixtures by microbial carbonate precipitation

Đánh Giá Khả Năng Xử Lý Tính Thấm Đối Với Cốt Liệu Bê Tông Cũ Của Vi Khuẩn Tạo Kết Tủa Calcite Phân Lập Tại Việt Nam

Effects of bacterial consortium enhanced recycled coarse aggregates on self‐healing concrete immobilized with Bacillus megaterium MTCC 1684 and Bacillus subtilis NCIM 2193

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