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.

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.

On Properties of Recycled Coarse Aggregate from Repeatedly Recycling Waste Concrete

2011 ◽  
Vol 368-373 ◽  
pp. 2185-2188
Author(s):  
Ping Hua Zhu ◽  
Xin Jie Wang ◽  
Jin Cai Feng
Keyword(s):  
Compressive Strength ◽  
Coarse Aggregate ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Recycled Aggregates ◽  
Fine Aggregate ◽  
Recycled Coarse Aggregate ◽  
Coarse Aggregates ◽  
Recycled Fine Aggregate ◽  
Waste Concrete

The properties of recycled coarsee aggregates from repeatedly recycling waste concrete were determined. In this study, five series of concrete mixtures using coarse and fine natural aggregates were prepared, which have the same objective slump value from 35mm to 50mm and different compressive strengths ranging from 25MPa to 60 MPa. These five concretes were crushed, sieved, washed with water, hot treatmented at 300°C before they were used as recycled aggregates. After that, recycled aggregate concrete (RAC) was produced with an objectively compressive strength of 30MPa, in which the recycled coarse aggregate was used as 30%, 70% and 90% replacements of natural coarse aggregate and recycled fine aggregate as 10%, 20%, and 30% replacements of natural fine aggregate. After that, these recycled concretes were used as second recycled aggregates to produce RAC with the same objectively compressive strength of 30MPa. The physical properties of coarse aggregates including apparent density, water absorption, attached mortar content and crushing value were tested and their mineral characteristics were analyzed. The results showed that the quality of recycled coarse aggregates from twicely recycling waste concrete reached the requirements from structural concrete.

Finite Element Analysis and Experimental Verification on Mechanical Properties of Steel Mash Reinforced HDPE Composite Materials

2011 ◽  
Vol 311-313 ◽  
pp. 155-159 ◽  
Author(s):  
Xin Qian ◽  
Yang Fu Jin ◽  
Mi Zhou ◽  
Jia Na Sun
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Composite Material ◽  
Steel Wire ◽  
Flexural Modulus ◽  
Tensile Modulus ◽  
Wire Diameter ◽  
Element Analysis ◽  
Steel Wires ◽  
Specimen Width

Thorough constructing steel-plastic composite material model and using ANSYS finite element analysis software, this research make a CAE analysis and experimental verification to the elastic modulus and flexural modulus of reinforced HDPE composites under different steel structures. The research found that the tensile modulus of steel mash reinforced HDPE linearly increases with the increase of steel wire diameter and the number of steel wires on the specimen width. When the steel wire diameter is 3mm, the tensile modulus is up to 10 times of the pure HDPE’s. The number of steel wires on the specimen length does not affect the tensile modulus. Similarly, the flexural modulus of the composite material also linearly increases with the increase of steel wire diameter and the number of steel wires on the specimen width. However, when the steel wire diameter is 3mm, the flexural modulus is only 2 times of the pure HDPE’s. The data simulated by ANSYS software has a very good agreement with the experiment results. Therefore it can be applied to the actual design.

Technique Development of Recycling and Utilizing Waste Concrete as Building Material

2012 ◽  
Vol 174-177 ◽  
pp. 275-279
Author(s):  
Da Xing Qian ◽  
Ying Wei Yun ◽  
Il Young Jang ◽  
Woo Young Park
Keyword(s):  
Building Material ◽  
Coarse Aggregate ◽  
Recycled Concrete ◽  
Fine Aggregate ◽  
Aggregate Concrete ◽  
Recycled Coarse Aggregate ◽  
Recycled Fine Aggregate ◽  
Waste Concrete ◽  
Technique Development ◽  
Recycled Material

In this paper shucking technique is developed to improve the performance of recycled coarse aggregate concrete. Comparison test has been done to demonstrate the good performance of shucking recycled coarse aggregate concrete than that of common recycled concrete. Simultaneously recycled fine aggregate concrete and recycled finely grinded admixture are extracted and studied too. Results show that this new technique can not only improve the performance of recycled material and enlarge recycled material type, but also make waste concrete to be reused completely.

State-of-the-Art Report of Recycled Aggregate Concrete and Rapid Repair Concrete

2014 ◽  
Vol 507 ◽  
pp. 343-346
Author(s):  
Ru Nan Qian ◽  
Shan Yuan Xu ◽  
Yi Dong Xu
Keyword(s):  
State Of The Art ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Engineering Practice ◽  
Fine Aggregate ◽  
Cement Concrete ◽  
Aggregate Concrete ◽  
Rapid Repair ◽  
Recycled Fine Aggregate ◽  
Concrete Recycling

As an eco-material, the application of recycled aggregate concrete and rapid repair concrete has been deeply researched in recent years. But the application of recycled aggregate concrete with recycled fine aggregate and recycled powder in pavement rapid repair project is seldom. Combing with the related literatures and our own engineering practice, the state-of-the-art report of recycled aggregate concrete and rapid repair concrete is presented, and hope to supply a new way to solve the long-standing issue of waste cement concrete recycling and rapid opening traffic simultaneously.

scholarly journals Engineering and Manufacturing Technology of Green Epoxy Resin Coatings Modified with Recycled Fine Aggregates

2021 ◽  
Author(s):  
Kamil Krzywiński ◽  
Łukasz Sadowski ◽  
Damian Stefaniuk ◽  
Aleksei Obrosov ◽  
Sabine Weiß
Keyword(s):  
Mechanical Properties ◽  
Epoxy Resin ◽  
Construction And Demolition Waste ◽  
Fine Aggregate ◽  
Micro Computed Tomography ◽  
Demolition Waste ◽  
Replacement Ratio ◽  
Recycled Fine Aggregate ◽  
Fine Aggregates ◽  
Computed Tomography Scanning

AbstractNowadays, the recycled fine aggregate sourced from construction and demolition waste is not frequently used in manufacturing of epoxy resin coatings. Therefore, the main novelty of the article is to prepare green epoxy resin coatings modified with recycled fine aggregate in a replacement ratio of natural fine aggregate ranged from 20 to 100%. The microstructural properties of the aggregates and epoxy resin were analyzed using micro-computed tomography, scanning electron microscopy and nanoindentation. The macroscopic mechanical properties were examined using pull-off strength tests. The highest improvement of the mechanical properties was observed for epoxy resin coatings modified with 20% of natural fine aggregate and 80% of recycled fine aggregate. It has been found that even 100% of natural fine aggregate can be successfully replaced using the recycled fine aggregate with consequent improvement of the pull-off strength of analyzed epoxy resin coatings. In order to confirm the assumptions resulting from the conducted research, an original analytical and numerical failure model proved the superior behavior of modified coating was developed.

scholarly journals Assessing the Flexural Properties of Epoxy Composites with Extremely Low Addition of Cellulose Nanofiber Content

2020 ◽  
Vol 10 (3) ◽  
pp. 1159 ◽  
Author(s):  
Yingmei Xie ◽  
Hiroki Kurita ◽  
Ryugo Ishigami ◽  
Fumio Narita
Keyword(s):  
Mechanical Properties ◽  
Epoxy Resin ◽  
Flexural Modulus ◽  
Strengthening Mechanism ◽  
Short Fiber ◽  
Cellulose Nanofiber ◽  
Resin Matrix ◽  
Element Analysis ◽  
Epoxy Resin Matrix ◽  
The Matrix

Epoxy resins are a widely used common polymer due to their excellent mechanical properties. On the other hand, cellulose nanofiber (CNF) is one of the new generation of fibers, and recent test results show that CNF reinforced polymers have high mechanical properties. It has also been reported that an extremely low CNF addition increases the mechanical properties of the matrix resin. In this study, we prepared extremely-low CNF (~1 wt.%) reinforced epoxy resin matrix (epoxy-CNF) composites, and tried to understand the strengthening mechanism of the epoxy-CNF composite through the three-point flexural test, finite element analysis (FEA), and discussion based on organic chemistry. The flexural modulus and strength were significantly increased by the extremely low CNF addition (less than 0.2 wt.%), although the theories for short-fiber-reinforced composites cannot explain the strengthening mechanism of the epoxy-CNF composite. Hence, we propose the possibility that CNF behaves as an auxiliary agent to enhance the structure of the epoxy molecule, and not as a reinforcing fiber in the epoxy resin matrix.

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