By treating the recycled aggregate with all treatment processes the physical, mechanical, and durability properties are improved when compared to untreated recycled coarse aggregate concrete.

With the rapid development of urbanization, many new buildings are erected, and old ones are demolished and/or recycled. Thus, the reuse of building materials and improvements in reuse efficiency have become hot research topics. In recent years, scholars around the world have worked on improving recycle aggregates in concrete and …

Recycled aggregate concrete (RAC) has become a popular building material due to its eco-friendly features, but the difficulty in predicting the crack resistance of RAC is increasingly impeding its ...

By treating the recycled aggregate with chemical, heat, and Abrasion machine it improves the physical properties of RCA [10]. The Mechanical properties of RAC decrease with an increase of recycled coarse aggregate percentage in the mixture [23], [24]. ... [25]. The durability and mechanical properties of recycled aggregate concrete …

In this paper, a novel and simple approach for strengthening the mortar layer of RCA by treatment with a crystallizing agent (CA) was proposed, and the effects of different treatment regime on the density, water absorption, mineral composition, and …

3.2.1. Mechanical Treatment . In the first stage, the mechanical treatment was conducted on the reused RCAs with a Los Angeles abrasion machine to disintegrate part of the mortar from the aggregate. The crushed concrete aggregate, which was less than a grain size of 20 mm, was sieved and separated from the fine and dust fractions.

The pozzolan filled the pores and microcracks of recycled aggregate. • The bi-combination methods increased the 28-days compressive strength up to 46 MPa. • The enhancement methods enable the use of recycled aggregate in structural concrete. • Treating recycled aggregate promotes its utilization in the construction industry.

In this present study, discussed the different treatment methods they are chemical treatment, mechanical grinding treatment or ball milling method, thermal …

It can also be seen that the heat and mechanical treatment of recycled aggregate up to 600 °C had a positive effect on the capillary structure of concrete, reducing the depth of water penetration in comparison with the control concrete by 6–10%. ... Then the cement mortar together with cleaned recycling aggregate goes outside the machine, e ...

This study targeted brick waste as a potential material to be used as a partial replacement of natural aggregates in structural concrete. It has been known that the concrete constructed with recycled brick aggregates possesses substandard mechanical properties. Traditionally, synthetic FRPs are known to strengthen recycled aggregate …

The change in concrete failure (aggregate failure is due to greater adherence of recycled aggregates with cement paste) is the rationale for boosting the concrete strength with these aggregates [34].Instead of natural aggregates, recycled coarse grains were used. The compressive strength of concrete containing 25, 50, 75, and 100 % …

Wasted concrete was often used as a recycled aggregate instead natural stone in fresh concrete to reduce the environmental impact in a decade. However, because of the residual mortar interface, the performance of recycled aggregate was weaker. In this paper, the recycled aggregate was prewetted, and the effects of prewetted degree on …

Recycle concrete aggregates (RCA) consist of natural aggregates and remnant mortar adhered to their surface. The amount, size, and morphology of the adherent remainder paste influences quality aspects of RCA, such as their bonding potential with new cement matrix in an RCA-based concrete, as well as the concrete's overall rheological …

This research presents a standard procedure for identifying mechanically treated recycled concrete aggregate with properties (physical properties and …

The recycled aggregates were crushed from old concrete cubes with strength ranging from 30 to 40 MPa. The recycled aggregates were crushed in a crusher machine as per the grading requirements and sieved downgrading 12.5 mm sieve and above 4.75 mm sieve. The process of obtaining recycled aggregates along with their …

Therefore, a mechanical treatment method was applied to RCA to partially remove the adhered mortar and improve Recycled Aggregate Concrete (RAC) …

This paper examines the influence of acetic acid-treated recycled aggregates on the physical, mechanical, and durability properties of self-compacting concrete. Meanwhile, the zero waste technique has been implemented through the addition of waste acetic acid solution from the aggregate treatment, and its effects on fresh …

Recycled concrete aggregates (RCAs) have low quality when compared with natural or conventional aggregates as the paste adhering to it is the key aspect that affects its functionality. Since the adhering cementitious paste weakens the adhesion between the aggregate and the binder, it becomes a decisive factor in the mechanical …

This study used pressurized carbonization to strengthen the performance of RCA, and the effects of aggregate size (5–10 and 10–20 mm), carbonization pressure (0.5, 1, and 2 Bar) and time (2 ...

Influence of recycled aggregates on long term mechanical properties and pore size distribution of concrete. Cem. Concr. Compos. (2011) ... an average pH of 11.28 was observed for the effluent of the waste concrete treatment, while CWs with waste brick treatment or common gravel treatment exhibited an effluent pH of 7.57 ± 0.03 and 7.57 …

Compared with natural aggregate concrete, the 28-day compressive strength, splitting strength and cohesive force of 100% recycled aggregate concrete are reduced by 16.1%, 20.1% and 18.1% ...

Geopolymer recycled aggregate concrete (GPRAC) is a new type of green material with broad application prospects by replacing ordinary Portland cement with geopolymer and natural aggregates with recycled aggregates. This paper summarizes the research about the mechanical properties, durability, and microscopic aspects of …

Dear Colleagues, The Special Issue, "Mechanical Behavior, Leaching and Environmental Evaluation of Recycled Aggregates", will address advances in materials science by the study of revalorization and recycling systems for construction and industrial wastes, and the evaluation of the physical, chemical and mechanical properties of …

Thermo-mechanical treatment Aggregate characteristics Construction activity results in a significant consumption of natural resources and waste generation, which is detrimental …

The gap in compressive strength of concrete made with fully recycled aggregate is 26% at the curing age of 28 days. However, this gap can be reduced by up to 5.6% by removing the adhered mortar and enhancement of recycled aggregate. So, by the use of mechanical treatment on RCA, the compressive strength is increased.

Based on the test results, 72 h of soaking in mild acetic acid (3% concentration) followed by 7 min of mechanical grinding in the LA abrasion machine was observed as the optimal treatment duration ...

The mechanical Aggregate crushing equipment ..., Aggregate Machine, Recycled Aggregate to clients. ... The mechanical Aggregate crushing equipment, construction waste recycling. Go to Product Center. Use of Recycled Tires as Partial Replacement of Coarse ..., Pre-treating the rubber with ...

Standard sand in accordance with Chinese standard GB/T 14684-2011 [42] produced by Xiamen ISO Standard Sand Co., Ltd. was used as the fine aggregate.Broken basalt with a size range of 5–10 mm from Shenzhen was selected for crude NA, which met the requirements of Chinese standard GB/T 14685-2011 [43].To better compare the …

This study investigated the properties of fine recycled aggregates (FRA), with a view to enhancing their properties for structural concrete applications. The study explored several approaches including mixing; curing; systematic screening of FRA particles below 1.18 mm to reduce the adhered cement paste (ACP) content; and the use of fly ash as 30% …

A Mechanical Treatment Method for Recycled Aggregates and Its Effect on Recycled Aggregate-Based Concrete A Mechanical Treatment Method for Recycled …