Performance of mortar prepared with recycled concrete aggregate enhanced by CO2 and pozzolan slurry

Shi, Caijun; Wu, Zemei; Cao, Zhijie; Ling, Tung-Chai; Zheng, Jinju

doi:10.1016/j.cemconcomp.2017.10.013

Cited by 204 publications

(65 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…11 (Zhang et al 2015b). These findings agreed with Shi et al (2018), who explained that the carbonation treatment enhanced the quality of both old and new ITZs by achieving a greater micro-hardness and denser structure. Xuan et al (2017) studied the durability properties of RAC prepared with carbonated RCA in a 100% CO 2 environment.…”

Section: Carbonation Techniquesupporting

confidence: 82%

Quality Improvement Techniques for Recycled Concrete Aggregate: A review

Shaban

Yang

et al. 2019

ACT

127

View full text Add to dashboard Cite

The main problem in using recycled concrete aggregate (RCA) as a construction material is due to the weak adhered mortar which usually has higher porosity and water absorption. It also has lower strength compared to natural aggregate (NA), and it often forms weak interfacial transition zones in the recycled aggregate concrete (RAC). These weak zones lead to negative effects on the mechanical properties and durability performance of RAC. In order to utilize RCA in more effectively as aggregate in concrete, it is necessary to improve the quality and enhance the properties of the attached weak mortar. This paper reviews different treatment methods of RCA based on the published research, and systematically analyses the strengths and weaknesses as well as the applicability and limitations of each method. The advantages and disadvantages of each treatment method, in terms of their technical feasibility, efficiency, economic and environmental impacts, are also discussed, in view of facilitating the selection of the most suitable treatment method for RCA. Although most techniques have been examined and trialed under laboratory conditions, further investigations are required to determine the most effective approach for treating RCA, with consideration not only given to the laboratory scale, but also on a commercial production scale.

show abstract

Section: Carbonation Techniquesupporting

confidence: 82%

Quality Improvement Techniques for Recycled Concrete Aggregate: A review

Shaban

Yang

et al. 2019

ACT

127

View full text Add to dashboard Cite

show abstract

“…Even after the first cracks are formed a sample could withstand a large number of loads before its destruction. The final impact energy (before destruction) exceeded the published results for high-strength concrete [14][15][16][17][18][19][20][21]. It means that the developed fiber concretes have high impact strength and excellent potential for use as construction materials for protective structures.…”

Section: Advances In Engineering Research Volume 177mentioning

confidence: 81%

Increasing Impact Endurance of Fiber Concrete

Lesovik¹,

Mochalov²,

Fediuk³

et al. 2018

Proceedings of the International Symposium “Engineering and Earth Sciences: Applied and Fundamental Research” (ISEES 2018)

View full text Add to dashboard Cite

The study covers the optimization of physical and mechanical properties and operational characteristics of fiber concrete that include complex influence of a binding agent on structure formation. The optimal composition of concrete ensuring the maximum static and dynamic strength was selected (impact endurance increases 6 times). It was revealed that the concrete with minor defects, high packing density, high fillercement stone adhesion ratio, increased ratio of static tensile strength against static compression strength Rt/Rcom and plasticity is characterized by the best resistance to dynamic loads. The penetration test on reinforced and fiber concrete plates showed that unreinforced concrete samples were completely destroyed while fiber concrete samples demonstrated their through penetration under the striker load.

show abstract

“…e carbonation is frequently harmful to the concrete durability, which reduces the basicity and results in the steel corrosion of reinforce concrete, whereas the microstructure, strengths, and dense of concrete after carbonation are generally improved [180][181][182]. Basing on the positive effect of carbonation reaction, Shi et al [183] proposed that the carbonation treatment was used to modify the properties of RA and RAC. Figure 14 gives the SEM images of adhered old mortar and ITZ of RA with and without carbonation treatment.…”

mentioning

confidence: 99%

“…SEM images of old mortar and ITZ of RA with and without carbonation[183]. (a) RA and (b) RA after carbonation.…”

mentioning

confidence: 99%

Durability Studies on the Recycled Aggregate Concrete in China over the Past Decade: A Review

Yang

et al. 2019

Advances in Civil Engineering

View full text Add to dashboard Cite

Since China hosted the Olympic Games in 2008, a mass of construction and demolition (C&D) wastes were produced with the rapid urbanization construction. Recycling the C&D waste into recycled aggregates (RA) is an effective method for reducing the amount of C&D wastes. Many studies on the properties of RA and the durability of recycled aggregate concrete (RAC) were conducted in China over the past decade. Due to the restrictions of various languages, some valuable studies on the durability of RAC are hard to be acquired by the scholars around the world. erefore, this paper is developed to review the studies on the durability of RAC in China, and the shrinkage behavior, chloride permeability, carbonation behavior, and freeze-thaw resistance of RAC are, respectively, introduced. Considering the waste concrete, bricks, and ceramics used in preparing RA are frequently mixed together in China, this study proposes an index of average water absorption rate to quantify the effects of RA types, quality, and replacement percentages on the durability of RAC. Meanwhile, the relationship between the average water absorption rate of RA and the durability parameters of RAC is established. Finally, the improving methods of RAC durability are introduced, and the RA particle shaping and carbonation modification are emphasized.

show abstract

Performance of mortar prepared with recycled concrete aggregate enhanced by CO2 and pozzolan slurry

Cited by 204 publications

References 24 publications

Quality Improvement Techniques for Recycled Concrete Aggregate: A review

Quality Improvement Techniques for Recycled Concrete Aggregate: A review

Increasing Impact Endurance of Fiber Concrete

Durability Studies on the Recycled Aggregate Concrete in China over the Past Decade: A Review

Contact Info

Product

Resources

About