CALL US

+86 15517153367

surface treatment of recycled concrete aggregates through

surface treatment of recycled concrete aggregates through

Surface treatment of recycled concrete aggregates

Apr 30, 2014  1. Introduction. Interest in using recycled concrete aggregates (RCA) from demolished old concrete structures in new construction is growing fast recently .Such interest derives from two problems associated with sustainability, i.e. lack of land for disposing demolished concrete debris and depletion of quality primary natural aggregates for concrete production.

get price

Surface treatment of recycled concrete aggregates

PDF On Apr 1, 2014, Jishen Qiu and others published Surface treatment of recycled concrete aggregates through microbial carbonate precipitation

get price

Surface treatment of recycled concrete aggregates

Reuse of recycled concrete aggregates (RCA) in new concrete structures is limited due to their high water absorption and weak bonding to new matrix. These unfavorable properties are associated with the thin layer of old mortar attached to the surface of original aggregates.

get price

A Mechanical Treatment Method for Recycled Aggregates

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 and performance characteristics.

get price

Surface Treatment on Recycled Coarse Aggregates with ...

Surface treatment, using two slurries containing nanomaterials, was applied to recycled aggregate (RA). Experimental studies were conducted (1) to compare properties of RA before and after the surface treatment; and (2) to examine the modification effects of the surface treatment with nanomaterials on the microstructure and macroproperties of recycled

get price

Modifying recycled aggregate concrete by aggregate

Dec 20, 2018  Recycled aggregate (RA) was surface treated by sulphoaluminate cement (SAC). • Quality of RA and performance of recycled aggregate concrete (RAC) were improved. • Addition of basalt powder (BP) to the SAC slurry improved the modifying efficiency. • The ITZ 1 and ITZ 3 in the modified RAC presented a sandwich-like structure. •

get price

Surface modification of recycled coarse aggregate based

A novel environmental MICP (Microbial Induced Carbonate Precipitation) system was applied to modify recycled aggregate. • The mechanism of different MICP systems was revealed by comparing the modification effect of different treatment methods. • After modification, both macro and micro properties of recycled aggregate and concrete were ...

get price

Effect of the surface treatment of recycled rubber on the ...

Jun 07, 2014  高达12%返现  In this study, the influence of the addition of tire rubber in concrete was evaluated, to partially replace the fine aggregate of sand particles. The rubber fibers were also surface treated with different solvents to improve adhesion of the fibers to the concrete matrix. Compressive strength, slump test, Fourier Transform Infrared Spectroscopy

get price

Tea stain-inspired treatment for fine recycled concrete ...

Nov 30, 2020  A massive fraction of recycled concrete aggregates (RCAs) is fine RCA. Once recycled in new concrete, fine RCA can significantly reduce the mechanical strength and durability of the concrete since fine RCA has high water absorption and high porosity. To address this issue, this study proposes to treat the fine RCA using a tea-stain inspired ...

get price

Studies on thermo-chemical treatment of recycled

Apr 05, 2017  高达12%返现  Qiu J, Tng DQS, Yang E-H (2014) Surface treatment of recycled concrete aggregates through microbial carbonate precipitation. Constr Build Mater 57:144–150. Article Google Scholar 4. Geng J, Sun J (2013) Characteristics of the carbonation resistance of recycled fine aggregate concrete. Constr Build Mater 49:814–820

get price

Surface Treatment of Recycled Concrete Aggregates

Surface Treatment of Recycled Concrete Aggregates through Microbial Carbonate Precipitation Jishen *Qiu, David Qin Sheng Tng, En-Hua Yang School of Civil and Environmental Engineering, Nanyang ...

get price

Surface treatment of recycled concrete aggregates through ...

Construction and Building Materials, v. 57, April 2014, p. 144-150: Summary: Reuse of recycled concrete aggregates (RCA) in new concrete structures is limited due to their high water absorption and weak bonding to new matrix. These unfavorable properties are associated with the thin layer of old mortar attached to the surface of original ...

get price

Effect surface treatment of recycled concrete aggregate on ...

Apr 09, 2013  Effect surface treatment of recycled concrete aggregate on properties of fresh and hardened concrete Abstract: The inferior properties of the recycled concrete aggregate (RCA), as compared with the natural aggregate, are caused by the presence of the porous residual mortar with numerous micro-cracks, which is attached to the original aggregates.

get price

Influence of Surface Treatment of Recycled Aggregates on ...

Aug 02, 2019  Ismail, S.; Ramli, M. Effect surface treatment of recycled concrete aggregate on properties of fresh and hardened concrete. In Proceedings of the 2013 IEEE Business Engineering and Industrial Applications Colloquium (BEIAC), Langkawi, Malaysia, 7–9 April 2013; pp. 651–656. [Google Scholar]

get price

Influence of Surface Treatment of Recycled Aggregates on ...

Aug 02, 2019  For this purpose, incorporation of recycled concrete aggregate in concrete products particularly self-compacting concrete (SCC) for structural and non-structural application would be significant achievement. In this study the fresh and hardened properties of SCC prepared by substituting natural aggregates (NA) with recycled coarse aggregates (RCA).

get price

Quality improvement of the recycled aggregates through ...

The water permeability, air permeability and surface permeability of recycled aggregate concrete (RAC) are compared with those of a control concrete made with natural aggregate.

get price

The Recycled Aggregates with Surface Treatment by ...

To improve the mechanical properties of concretes containing recycled aggregates, pozzolanic materials were used to decrease the porosity of the recycled aggregates. These pozzolanic materials were adhered on the surface of recycled aggregates and closed the open pores so that the water absorption was decreased 1~2% as the amount of adsorption was increased.

get price

Effect of the surface treatment of recycled rubber on the ...

Jun 07, 2014  In this study, the influence of the addition of tire rubber in concrete was evaluated, to partially replace the fine aggregate of sand particles. The rubber fibers were also surface treated with different solvents to improve adhesion of the fibers to the concrete matrix. Compressive strength, slump test, Fourier Transform Infrared Spectroscopy of concrete

get price

Studies on thermo-chemical treatment of recycled concrete ...

Apr 05, 2017  Qiu J, Tng DQS, Yang E-H (2014) Surface treatment of recycled concrete aggregates through microbial carbonate precipitation. Constr Build Mater 57:144–150. Article Google Scholar 4. Geng J, Sun J (2013) Characteristics of the carbonation resistance of recycled fine aggregate concrete. Constr Build Mater 49:814–820

get price

Effect of surface treatment of recycled concrete aggregate ...

Effect of surface treatment of recycled concrete aggregate by cement -silica fume slurry on compressive strength of concrete. Recycled concrete aggregate (RCA) used as an alternative to natural aggregate (NA) contains weak adhered mortar. The adhered mortar adversely affects the properties of RCA, and compressive strength of concrete with RCA.

get price

[PDF] Effect of Surface Modifications of Recycled Concrete ...

Dec 26, 2017  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

Surface Treatment on Recycled Coarse Aggregates with ...

Surface treatment, using two slurries containing nanomaterials, was applied to recycled aggregate (RA). Experimental studies were conducted (1) to

get price

Utilization of alternative aggregates for roller compacted ...

Type of recycled aggregate Method of treatment Techniques Reasons References; Recycled Concrete aggregates: Removal of adhered mortar: Mechanical grinding: Effective removal of adhered mortar To improve the bonding between the RCA and new mortar To reduce the water absorption: Thermal treatment: To improve the bonding between the RCA and new mortar

get price

Evaluation on the Surface Modification of Recycled Fine ...

Feb 21, 2018  Materials. In the experiments, H 2 SiF 6 of pH 1.0 (10% solution) was used as acid treatment for surface modification of RFAs. And both natural fine aggregate (NFA) and RFAs were used, and the basic physical properties of the fine aggregates are shown in Table 3.Three types of recycled aggregates (RFA 1, 2 and 3) were used in this study.

get price

Surface treatment of recycled concrete aggregates through ...

Construction and Building Materials, v. 57, April 2014, p. 144-150: Summary: Reuse of recycled concrete aggregates (RCA) in new concrete structures is limited due to their high water absorption and weak bonding to new matrix. These unfavorable properties are associated with the thin layer of old mortar attached to the surface of original ...

get price

Influence of Surface Treatment of Recycled Aggregates on ...

Aug 02, 2019  For this purpose, incorporation of recycled concrete aggregate in concrete products particularly self-compacting concrete (SCC) for structural and non-structural application would be significant achievement. In this study the fresh and hardened properties of SCC prepared by substituting natural aggregates (NA) with recycled coarse aggregates (RCA).

get price

Enhancement Treatment of Recycled Concrete Aggregate

Jul 22, 2021  Aggregate is an essential component in concrete, occupying 60–70% of the concrete by volume. Nevertheless, the application of natural aggregate (NA) is restricted due to the finite resources and long regeneration period. Recycled concrete aggregate (RCA), as common CD waste, has received widespread attention for its usage to replace NA.

get price

Quality improvement of the recycled aggregates through ...

English: The study here presented aims to improve the recycled aggregates quality through surface treatment. The developed methodology has put into practice different impregnation methods using recycled aggregates of various origins and highly pozzolanic impregnation products. After evaluating each of the studied impregnation methods, the ...

get price

Influence of Treatment Methods on Recycled Aggregate ...

Fig. 3 Sieving broken aggregate through standard sieves In second stage, before the aggregates are subjected to various treatment methods. Recycled aggregates are tested for physical properties to check withier the retrieved aggregates could be used in concrete mix without the treatment or not. Following tests

get price

[PDF] Effect of Surface Modifications of Recycled Concrete ...

Dec 26, 2017  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

Upgrading the Quality of Recycled Aggregates from ...

recycled concrete aggregates (RCA) purity for MRA quality improvement. MRA after purification was also processed with surface treatment experiment by rotating in a cylinder to improve the

get price

Utilization of alternative aggregates for roller compacted ...

Type of recycled aggregate Method of treatment Techniques Reasons References; Recycled Concrete aggregates: Removal of adhered mortar: Mechanical grinding: Effective removal of adhered mortar To improve the bonding between the RCA and new mortar To reduce the water absorption: Thermal treatment: To improve the bonding between the RCA and new mortar

get price

(PDF) Microwave radiation treatment to improve the ...

Oct 01, 2021  The engineering characterizations of the concrete incorporating microwave treated recycled plastic aggregates were assessed through investigating physical and mechanical properties as well as ...

get price

(PDF) Bond Behavior of Recycled Fiber Recycled Concrete ...

Dec 03, 2021  The bond behavior between recycled fiber recycled concrete (RFRC) and reinforcement after F-T cycles was investigated in this paper. The pull-out tests were undertaken with the replacement rate (0 ...

get price

Treatments for the Improvement of Recycled Aggregate

The efficiency of a nano-silica (NS) treatment method, namely pre-spraying NS suspension on the surface of recycled aggregate (RA), in enhancing strength of

get price

Chemico-thermal treatment for quality enhancement of ...

May 29, 2019  Utilization of recycled concrete fine aggregates to full potential in the construction sector is necessary to increase the ecological value and solves the issues of natural sand scarcity. However, the quality of recycled concrete fine aggregates is inferior to conventional aggregates. Hence, a treatment process is obviously essential for improving the

get price

Influence of Treatment Methods on the ... - ASCE Library

May 05, 2015  The physical and mechanical properties of these aggregates, and their strength and performance of recycled aggregate concrete are determined. The results show that treatment with H 2 SO 4, and heating and scrubbing yield, aggregate with reduced water absorption and other desired properties of natural aggregate. The concrete made out of these ...

get price

Modification of recycled aggregate by spraying colloidal ...

Nov 16, 2021  In this study, modification methods of recycled coarse aggregate (RCA), namely spraying colloidal nano silica (NS) and silica fume (SF) on the surface of RCA, were adopted to enhance the performance of recycled aggregate concrete (RAC). In the RCA modification methods, colloidal NS with different particle sizes (12 nm, 54 nm and 106 nm) and colloidal SF

get price