Evaluation on the Surface Modification of Recycled Fine Aggregates in Aqueous H2SiF6 Solution

Ryu, Hwa-Sung; Kim, Deuck-Mo; Shin, Sang-Heon; Lim, Soo-Jeong; Park, Won-Jun

doi:10.1186/s40069-018-0256-5

Cited by 20 publications

(6 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It can be observed that the thicker and tougher of LWPA shells corresponding to the pre-soaking treated method with various ratios of w/c, which increases significantly for the TDS/0.6. According to Ryu et al [40], the improvement of compressive strength is due to the interfacial transition zone (ITZ) which is subjected to the cohesive bonding strength between the cement paste and LWA. Furthermore, the compressive strength enhancement of the concrete cube is more prominent at the latter stages due to the special impacts of the pre-soaking treated method.…”

Section: Compressive Strength Testmentioning

confidence: 99%

Effect of Pre-Soaking Treatment Method on Plant-Based Aggre-Gate for Production of High-Strength Lightweight Concrete

Yew¹,

Yew²,

Beh³

et al. 2023

Preprint

View full text Add to dashboard Cite

This research investigates the effect of pre-soaking treatment on plant-based aggregate using a wet grout binder to formulate a high-strength lightweight concrete (HSLWC). The surface modification utilising a novel grout soaking technique with various water-to-cement (w/c) ratios indicated a new method of approach for the recent development of lightweight plant-based aggregate (LWPA). In this experiment, the fresh and hardened properties of modified LWPA lightweight concrete were assessed by verifying their workability, densities, compressive and split tensile strengths towards the modulus of elasticity. The results showed that pre-soaking plant-based lightweight aggregate (w/c: 0.6, 0.8, 1.0, and 1.2) slightly increased the density of the samples compared to untreated LWPA. The oven-dry density of treated and untreated LWPA is controlled in the range of HSLWC. The outcomes indicated that the workability of the surface- modified LWPA has significant improvement up to 40% in 6 min for (TDS)/0.6 sample compared to the original LWPA. The mechanical properties of the LWPA concrete with surface modification method exhibit substantial increment of compressive strength, split tensile strength, and modulus of elasticity were recorded at 22%, 26%, and 34%, respectively. Significantly, the findings from this scientific method revealed that the pre-soaking treatment method on LWPA has shown to be a highly recommended technique in improving interfacial bonding while performing as one of the most promising solutions to improve the properties of lightweight concrete.

show abstract

Section: Compressive Strength Testmentioning

confidence: 99%

Effect of Pre-Soaking Treatment Method on Plant-Based Aggre-Gate for Production of High-Strength Lightweight Concrete

Yew¹,

Yew²,

Beh³

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…Lightweight plant-based aggregate (LWPA) concrete can be categorized as a special type of concrete with a characteristic oven-dried density not more than 2000 kg/m 3 [40] Among the three types of density (DD: demoulded density, ADD: air-dry density, and ODD: oven-dry density), all specimens fell within the range of the lightweight concrete category, as presented in Figure 6. The oven-dry density and air-dry density of untreated shell mixes ranged between 1897-1908 kg/m 3 and 1973-1998 kg/m 3 , respectively.…”

Section: Densities (Demoulded Air-dry and Oven-dry)mentioning

confidence: 99%

“…The thickness and toughness of LWPA shells corresponding to the pre-soaking treatment method with various ratios of w/c increases significantly for TDS/0.6. According to Ryu et al [40], the improvement of compressive strength is due to the interfacial transition zone (ITZ), which is subjected to the cohesive bonding strength between the cement paste and LWA. Furthermore, the compressive strength enhancement of the concrete cube is more prominent at the latter stages due to the special impact of the pre-soaking treatment method.…”

Section: Mechanical Properties Of Concrete Compressive Strength Testmentioning

confidence: 99%

Effect of Pre-Soaking Treatment Method of Plant-Based Aggregate on the Properties of Lightweight Concrete—Preliminary Study

Yew

Beh

et al. 2023

Coatings

View full text Add to dashboard Cite

This research investigates the effect of pre-soaking treatment on plant-based aggregate using a wet grout binder to formulate a high-strength lightweight concrete (HSLWC). Surface modification utilising a novel grout soaking technique with various water-to-cement (w/c) ratios has indicated a new method of approach for the recent development of lightweight plant-based aggregate (LWPA). In this experiment, the fresh and hardened properties of modified LWPA lightweight concrete were assessed by verifying their workability, densities, compressive and split tensile strengths towards the modulus of elasticity. The results showed that pre-soaking plant-based lightweight aggregate (w/c: 0.6, 0.8, 1.0 and 1.2) slightly increased the density of the samples compared to untreated LWPA. The oven-dry density of treated and untreated LWPA is controlled in the range of HSLWC. The outcomes indicated that the workability of the surface-modified LWPA is significantly improved: up to 40% in 6 min for the (TDS)/0.6 sample compared to the original LWPA. The mechanical properties of the LWPA concrete with the surface modification method exhibit a substantial increment of compressive strength, split tensile strength and the modulus of elasticity; recorded at 22%, 26% and 34%, respectively. Significantly, the findings from this experiment reveal that the pre-soaking treatment method on LWPA is shown to be a highly recommended technique in improving interfacial bonding while maintaining its performance as one of the most promising solutions to improve the properties of lightweight concrete.

show abstract

“…A study by Hwa-Sung Ryu [6] on "Evaluation on the Surface Modification of Recycled aggregate in aqueous H2SiF6 solution", since recycled aggregates bring about a decrease in several performances when they are used for recycled aggregate concrete (RAC) because of the low qualities caused by the attached hydrated cement paste on the RA surface. The physical properties and mechanical performance of mortars using RFA were evaluated after RFA modification.…”

Section: Literature Reviewmentioning

confidence: 99%

Studies on Cent Percent Utilization of Recycled Coarse and Fine Aggregates in the Construction Industry

Prasad¹,

Kishore²

2021

cea

View full text Add to dashboard Cite

As a measure of conserving the resources and for creating eco-friendly environment, studies have been conducted on recycled demolished concrete aggregates (RCA) for their complete usage in the construction industry. The method adopted comprises improving the structure, physical and mechanical properties of RCA. The RCA that are obtained from impact jaw crusher, the surface of these aggregates is improved by processing it through miller machine by way of ball rotation action, where the surface defects and brittle fracture are removed without affecting the permanent mortar adhered on the aggregate, to these modified aggregates which are porous and weak in structure, the surface of the aggregates is subjected to various treatments to improve its structure. The techniques used are densification, hydrophobization, polymerization, and a combination of polymerization & densification. On these combinations, the various dosages of chemical treatments were applied and tested for their properties on coarse and fine aggregates. Finally, a combination of 2.5% of Lithium silicate treatment on coarse aggregates and 1 % colloidal silica treatment on fine aggregates has given satisfactory results in usage in concrete/cement mortar mass. On these combinations, the durability and microscopic studies (SEM, EDS, XRD) were done and it was observed that the combination has more association of silica with calcium and these resulted in more formation of C-S-H, and a dense interfacial transition zone. The aggregates applicability was tested in the field by using it for various civil works. All the tests and analyzed parameters indicate that the treated aggregates are future materials and act as a complete replacement for natural aggregates.

show abstract

Evaluation on the Surface Modification of Recycled Fine Aggregates in Aqueous H2SiF6 Solution

Cited by 20 publications

References 16 publications

Effect of Pre-Soaking Treatment Method on Plant-Based Aggre-Gate for Production of High-Strength Lightweight Concrete

Effect of Pre-Soaking Treatment Method on Plant-Based Aggre-Gate for Production of High-Strength Lightweight Concrete

Effect of Pre-Soaking Treatment Method of Plant-Based Aggregate on the Properties of Lightweight Concrete—Preliminary Study

Studies on Cent Percent Utilization of Recycled Coarse and Fine Aggregates in the Construction Industry

Contact Info

Product

Resources

About