Effects of Coating Materials and Application Methods on the Absorption Rate of Fine Aggregate Recycled from Waste Concrete

2021 ◽  
Vol 33 (3) ◽  
pp. 307-314
Author(s):  
Byung-Jae Lee ◽  
Kyu Hyoung Kim ◽  
Yun-Yong Kim
Keyword(s):  
Absorption Rate ◽  
Fine Aggregate ◽  
Coating Materials ◽  
Waste Concrete ◽  
Application Methods

Recycling of Waste Concrete and Fly Ash for Recycled Aggregate Concrete: Fundamental Characteristics Evaluation

2009 ◽  
Vol 620-622 ◽  
pp. 255-258 ◽  
Author(s):  
Cheol Woo Park
Keyword(s):  
Fly Ash ◽  
Recycled Concrete ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Experimental Program ◽  
Concrete Aggregate ◽  
Fine Aggregate ◽  
Recycled Concrete Aggregate ◽  
Aggregate Concrete ◽  
Waste Concrete

As the amount of waste concrete has been increased and recycling technique advances, this study investigates the applicability of recycled concrete aggregate for concrete structures. In addition fly ash, the industrial by-product, was considered in the concrete mix. Experimental program performed compressive strength and chloride penetration resistance tests with various replacement levels of fine recycled concrete aggregate and fly ash. In most case, the design strength, 40MPa, was obtained. It was known that the replacement of the fine aggregate with fine RCA may have greater influence on the strength development rather than the addition of fly ash. It is recommended that when complete coarse aggregate is replaced with RCA the fine RCA replacement should be less than 60%. The recycled aggregate concrete can achieve sufficient resistance to the chloride ion penetration and the resistance can be more effectively controlled by adding fly ash. It I finally conclude that the recycled concrete aggregate can be successfully used in the construction field and the recycling rate of waste concrete and flay ash should be increased without causing significant engineering problems.

Characteristics of Wear Layered Laston Mix Using Waste Concrete Aggregate

2021 ◽  
Vol 3 (3) ◽  
pp. 459-468
Author(s):  
Yanti ◽  
Rais Rachman ◽  
Alpius
Keyword(s):  
Coarse Aggregate ◽  
Mixture Design ◽  
Concrete Aggregate ◽  
Fine Aggregate ◽  
Waste Concrete ◽  
Characteristic Value ◽  
Marshall Test ◽  
Pavement Material

The research objective focuses on testing the characteristics of the Laston Lapis Aus mixture, the aggregate taken later to be studied is the aggregate of Concrete Waste. The method used in this study included testing the properties of coarse aggregate, fine aggregate and filler, after that the Laston Lapis Aus mixture design was carried out after that the marshall test was carried out while the marshalltest was carried out namely the conventional marshall to get the characteristic value. The results showed that the characteristics of the pavement material in the form of aggregates from Concrete Waste tested the 2018 Bina Marga General Specifications as road layers. Through Marshall testing, the characteristics of the Laston Lapis Aus mixture were abtained with asphalt levels of 5,50%, 6,00%, 6,50%, 7,00%, and 7,50%.

scholarly journals Effective utilization of recycled fine aggregate powder as reinforcement particles in polyethylene composite

2020 ◽  
pp. 096739112095138
Author(s):  
Yasuyuki Kanda ◽  
Mohammed Abass
Keyword(s):  
Composite Material ◽  
Flexural Modulus ◽  
Homogenization Method ◽  
Fine Aggregate ◽  
Element Analysis ◽  
Polyethylene Composite ◽  
Recycled Fine Aggregate ◽  
Waste Concrete ◽  
Dispersion State ◽  
Concrete Recycling

Effective waste concrete recycling is desirable from the viewpoints of environmental protection and extending the working lives of waste concrete final disposal sites. Recycled fine aggregate powders (RFAP) were obtained by milling waste concrete, and in this paper, we attempted to use RFAP as reinforcement particles in a polyethylene (PE) composite material. The PE powder and RFAP were blended together, and composites were fabricated using compression molding. Our results showed that the flexural strength and flexural modulus of the created composites improved with increased RFAP content. The RFAP dispersion state was honeycomb-like in the composite material, and from inspecting the specimen side view after three-point bending tests, it was apparent that crack propagation proceeded into the RFAP part of the composite, between PE particles. We then performed elastic stress analysis on the composites, in order to define the RFAP reinforcing behavior, using finite element analysis based on the homogenization method. As a result, it was revealed that the Mises stress decreased with increased RFAP content, confirming that there is a potential role for RFAP as reinforcement particles in PE-based composites.

Strengths Investigation of Air Entrained Recycled Fine Aggregate Mortar

2012 ◽  
Vol 253-255 ◽  
pp. 432-435
Author(s):  
Jiu Su Li ◽  
Chun Li Qin
Keyword(s):  
Flexural Strength ◽  
Mechanical Performance ◽  
Fine Aggregate ◽  
Aggregate Concrete ◽  
Optimum Dosage ◽  
Recycled Fine Aggregate ◽  
Waste Concrete

Fine aggregate can be extracted from waste concrete by series of processing. The recycled fine aggregate can then be utilized to manufacture recycled fine aggregate mortar (RFAM) or recycled fine aggregate concrete (RFAC). Air entraining agent was added in RFAM to improve its mechanical performance. The influence of the dosage of the air entraining agent on both the compressive and flexural strength of the RFAM was explored after 7 days and 28 days curing. The optimum dosage of the air entraining agent was determined.

Effect of Fine Aggregate on Properties of Asphalt Mixture

2014 ◽  
Vol 599 ◽  
pp. 115-119
Author(s):  
Fei Shang ◽  
Kai Xuan Li ◽  
Xin Yan Zhang ◽  
Yan Gao
Keyword(s):  
Theoretical Basis ◽  
Absorption Rate ◽  
Asphalt Mixture ◽  
Engineering Application ◽  
Vital Role ◽  
Volumetric Properties ◽  
Fine Aggregate ◽  
Stability Performance ◽  
Temperature Performance ◽  
Fine Aggregates

The fine aggregate plays a vital role in the performances of asphalt mixture. In this paper, four kinds of fine aggregates with different lithology, apparent density and water absorption rate were discussed. Asphalt mixture according to AC-13 is prepared by these four kinds of fine aggregates and the volumetric properties, water stability performance and high temperature performance of asphalt mixture were tested. Research shows that: the aggregate performance and the performance of mixture have obvious corresponding relation, which provides the theoretical basis for the engineering application of composite aggregates.

On Properties of Recycled Fine Aggregate for Structural Concrete from Repeatedly Recycling Concrete Waste

2014 ◽  
Vol 665 ◽  
pp. 163-166
Author(s):  
Ping Hua Zhu ◽  
Fei Fei Xie ◽  
Qun Xia
Keyword(s):  
Structural Properties ◽  
Experimental Research ◽  
Performance Degradation ◽  
Recycled Aggregate ◽  
Fine Aggregate ◽  
Preparation Process ◽  
Structural Concrete ◽  
Recycled Fine Aggregate ◽  
Waste Concrete

In order to explore the possibility of using repeatedly recycling waste concrete as aggregate to produce structural concrete, experimental research was carried out on the structural properties of three kinds of recycled fine aggregate (RFA) with two-regeneration cycles, two single and one mixed. The results showed that the quality of all RFAs meet the needs of Grade Ⅲ in GB/T25177-2010 and Level L in JISA 5023-2000. The degree of performance degradation is observed to enhance with increasing recycling cycle when taking the same preparation process of recycled aggregate.

scholarly journals Strength and Permeation Property of Concrete Made With Sugarcane Bagasse Ash and Granite Waste as Fine Aggregate Replacement

2019 ◽  
Vol 8 (3) ◽  
pp. 1982-1988
Keyword(s):  
Sugarcane Bagasse ◽  
Particle Packing ◽  
Industrial Wastes ◽  
Partial Replacement ◽  
Fine Aggregate ◽  
River Sand ◽  
Conventional Concrete ◽  
Waste Concrete ◽  
Concrete Production ◽  
Sugarcane Bagasse Ash

Use of agro and industrial wastes in concrete production will cause sustainable concrete era and greener habitat. In this study an endeavor has been made to discover the propriety of Sugarcane Bagasse Ash (SCBA) and Granite Waste (GW) as partial replacement for traditional river sand. The percentage substitute is calculated based on the particle packing approach. The properties such as compressive, splitting tensile, flexural strengths and modulus of elasticity, water absorption, sorptivity and rapid chloride penetration test of the concrete with bagasse ash and granite waste as a partial replacement for river sand and to evaluate them with those of conventional concrete made with river sand fine aggregate are investigated. The test results show that the strength aspects of bagasse ash-granite waste concrete are higher than those of the conventional concrete. Moreover, they suggest that the bagasse ash-granite waste concrete has higher strength characteristics and remains in the lower permeability level shows improvement in overall durability of concrete than the conventional concrete.

scholarly journals Recovery of Fine Aggregate and Cement Hydrate Powder from Fine Waste Concrete by Multi-Gravity Separator

2003 ◽  
Vol 119 (9) ◽  
pp. 553-558 ◽  
Author(s):  
Tsuyoshi HIRAJIMA ◽  
Fuminori HOSAKA ◽  
Satoru HONDA ◽  
Masami TSUNEKAWA ◽  
Masazumi ITO ◽  
...  
Keyword(s):  
Fine Aggregate ◽  
Waste Concrete ◽  
Gravity Separator ◽  
Cement Hydrate

Preparation and Properties of Graphene Oxide-Modified Anti-UV Waterborne Polyurethane Nanocomposites

NANO ◽  
2020 ◽  
Vol 15 (01) ◽  
pp. 2050005
Author(s):  
Xingyuan Ma ◽  
Mingrui Zhang
Keyword(s):  
Thermal Stability ◽  
Tensile Strength ◽  
Graphene Oxide ◽  
Absorption Rate ◽  
Three Dimensional ◽  
Waterborne Polyurethane ◽  
Chain Extender ◽  
Functional Coating ◽  
Coating Materials ◽  
Polyurethane Nanocomposites

In this present study, graphene oxide (GO) was used as a secondary chain extender and a functional modification assistant to fabricate a three-dimensional nanocomposite (GO-WPU) with waterborne polyurethane (WPU) through the prepolymer dispersion. The tensile strength and elastic modulus of GO-WPU with 0.2[Formula: see text]wt.% GO content, compared with those of pure WPU, increase by 170.38% and 50.9%, respectively. Even with a small amount of GO content added, the ultraviolet absorption rate significantly increased, whereas the ultraviolet transmittance decreased significantly. Other properties such as thermal stability and so on were also much enhanced. These results suggested that the functional nanocomposite GO-WPU prepared through the prepolymer dispersion will be an effective fabrication approach and have a wider scope of applications in functional coating materials and film materials.

Analysis on Calcination of Cementitous Powder of Waste Concrete for Raw Cement

2013 ◽  
Vol 831 ◽  
pp. 267-271 ◽  
Author(s):  
Eun Hee Kwon ◽  
Young Jun Lee ◽  
Gyu Hwan Cho ◽  
Cheon Park Dong
Keyword(s):  
Chemical Composition ◽  
Greenhouse Gas ◽  
Raw Material ◽  
Fine Aggregate ◽  
Waste Concrete ◽  
Alternative Material

The purpose of this study is to determine whether cementitous powder of waste concrete which is separated from waste concrete can be used as alternative raw material for limestone. Chemical composition of cementitous powder of waste concrete was actually analyzed and the experiment to measure the recovery of hydration of waste cementitous powder model was performed. As a result, hydration was recovered to the level at which it can be used as alternative raw material for limestone, but less than 10 % can be used due to mix of fine aggregate in less than 150μm which cannot be separated from cementitous powder. Therefore, development of technology to efficiently separate cementitous powder of fine aggregate is required to have the alternative material for limestone and effect for reduction of greenhouse gas.

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