scholarly journals APPLICABILITY OF RECYCLED FINE AGGREGATE CONCRETE FOR STRUCTURAL CONCRETE : Influence of properties of original mortar on qualities of recycled fine aggregate and recycled aggregate concrete

1997 ◽  
Vol 62 (502) ◽  
pp. 15-22 ◽  
Author(s):  
Yasuhiro DOSHO ◽  
Masafumi KIKUCHI ◽  
Akira MASUDA ◽  
Akio KOYAMA ◽  
Takahiro MIURA
Keyword(s):  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Fine Aggregate ◽  
Structural Concrete ◽  
Aggregate Concrete ◽  
Recycled Fine Aggregate ◽  
Influence Of Properties

The Properties of Fine Recycled Aggregate Concrete Containing Recycled Bricks from Construction and Demolition Waste

2018 ◽  
Vol 760 ◽  
pp. 193-198 ◽  
Author(s):  
Kristina Fořtová ◽  
Tereza Pavlů
Keyword(s):  
Recycled Aggregate Concrete ◽  
Construction And Demolition Waste ◽  
Recycled Aggregate ◽  
Partial Replacement ◽  
Fine Aggregate ◽  
Demolition Waste ◽  
Natural Sand ◽  
Aggregate Concrete ◽  
Freeze Thaw ◽  
Recycled Fine Aggregate

This paper presents research results of recycled fine aggregate concrete testing. The main aim of this contribution is verification of properties of fine aggregate concrete with partial replacement of fine natural aggregate by recycled masonry aggregate originated from construction and demolition waste. The influence of partial replacement of natural sand to mechanical properties and freeze-thaw resistance is described. The compressive strength and flexural strength were tested at the age of 28 and 60 days and after 25, 50, 75 and 100 freeze-thaw cycles. Partial replacement of natural sand was 0, 25 and 50 % for all these tests. Prismatic specimens were examined.

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 Degradation Resistance and Reliability Analysis of Recycled Aggregate Concrete in a Sulfate Environment

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Hui Cao ◽  
Lifeng Zhao ◽  
Chenggong Lu ◽  
Lijuan Guan ◽  
Hongxia Qiao ◽  
...  
Keyword(s):  
Modulus Of Elasticity ◽  
Dynamic Modulus ◽  
Coarse Aggregate ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Fine Aggregate ◽  
Aggregate Concrete ◽  
Recycled Coarse Aggregate ◽  
Recycled Fine Aggregate ◽  
Dynamic Modulus Of Elasticity

Resistance to sulfate degradation is an important index used to measure concrete’s durability. In this study, recycled aggregate concrete (RAC) with a 0%, 30%, and 50% recycled coarse aggregate substitution rate and a 0% and 15% recycled fine aggregate replacement rate was used as the research object, and its degradation resistance was evaluated by the mass loss rate and the relative dynamic modulus of elasticity. The degradation products were studied and analyzed with SEM scanning electron microscopy and XRD phase analysis. The relative dynamic modulus of elasticity was selected as the degradation index, the RAC concrete’s degradation resistance was modeled by Wiener, and the reliability curve was obtained. The results showed that expansion products, such as gypsum and Ettringite, were produced in RAC concrete in a dry-wet sulfate cycling environment, and such defects as pores and voids were filled in the initial stage. The stress the expansion products exerted in the later stage caused the concrete to crack and peel, which demonstrated that the fluctuation law of mass and the dynamic elastic modulus increased first and then decreased. The recycled coarse aggregate substitution ratio’s effect on RAC concrete is higher than that of recycled fine aggregate. The reliability curve established by the Wiener model can reflect the reliability of RAC concrete under different cycles well and can obtain RAC concrete’s sulfate degradation resistance life with different aggregate substitution rates.

Review of Long-Term Deformation of Recycled Coarse and Fine Aggregate Concrete

2013 ◽  
Vol 448-453 ◽  
pp. 734-737
Author(s):  
Jun Li Luo ◽  
Zhi Sheng Xu ◽  
Di Zhao
Keyword(s):  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Quality Level ◽  
Fine Aggregate ◽  
Aggregate Concrete ◽  
Recycled Fine Aggregate ◽  
Deformation Properties ◽  
Shrinkage And Creep ◽  
Creep And Shrinkage

Due to long test cycle, high cost and the complex factors, the long-term deformation properties (such as creep and shrinkage) of recycled aggregate concrete (short for RAC) are rarely reported so far. However this property is essential to fully understanding and widely applying the RAC. Base on investigation on plenty of research results of the long-term deformation of RAC, this paper systematically analyzed the effect of recycled coarse aggregate (C-RA) and recycled fine aggregate (F-RA) on creep and shrinkage performance of concrete. The analysis shows that not only the replacement proportion but also the quality level of recycle aggregate (RA) affect the shrinkage and creep properties of RAC. This outcome could serve as a basis for further research.

scholarly journals Effect of Recycled Aggregates on Strength and performance of Recylced Aggregate Concrete

2020 ◽  
Vol 184 ◽  
pp. 01085
Author(s):  
Dr.V. Mallikarjuna Reddy ◽  
M. Manikanta Sai Swaroop
Keyword(s):  
Coarse Aggregate ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Recycled Aggregates ◽  
Fine Aggregate ◽  
Aggregate Concrete ◽  
Recycled Coarse Aggregate ◽  
Recycled Fine Aggregate ◽  
The Difference ◽  
And Performance

This study is taken up to utilise the recycled coarse aggregate and recycled fine aggregate as replacement of natural aggregate in concrete mix. It is required to find the percentage of recycled coarse aggragate and recycled fine aggregate, as the strength of concrete can not be achieved by using higher percentaged. The purpose of study is to compare between recycled coarse aggregate and recycled fine aggregate with natural coarse aggregate and sand in terms of specific gravity, water absorption, particle size distribution. Further, this stydy will also consider the difference between the performance of Recycled Aggregate Concrete for different percentages of recycled coarse aggregate and recycled fine aggregate i.e for 0%, 10%, 15%, 20%, 25%, 30%, 35% replacement. The present study is an experimental investigation on the behaviour of recycled aggregate concrete (coarse& fine aggregates) with respect to the strength and performance.

Research on Properties of Recycled Fine Aggregate from Waste Recycled Aggregates Concrete

2011 ◽  
Vol 396-398 ◽  
pp. 93-95 ◽  
Author(s):  
Ping Hua Zhu ◽  
Xin Jie Wang ◽  
Jin Cai Feng
Keyword(s):  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Recycled Aggregates ◽  
Target Strength ◽  
Fine Aggregate ◽  
Structural Concrete ◽  
Recycled Fine Aggregate ◽  
Concrete Mixtures ◽  
Fine Aggregates ◽  
Mineral Compositions

The properties of recycled fine aggregate(RFA) from waste recycled aggregate concrete (RAC) were determined. In this study, five series of parental concrete mixtures using natural coarse and fine aggregates were prepared, which had the same target slump value from 35mm to 50mm and different compressive strengths ranging from 25MPa to 60 MPa. These concretes were used as recycled aggregates to prepare RACs with a compressive target strength of 30MPa. After that, these RACs were used as secondly recycled aggregates to produce RACs with the same compressive target strength of 30MPa. The physical properties of RFAs including apparent density, compacted bulk density and water absorption were tested. At the same time, fineness modulus of natural fine aggregates and RAFs were calculated and their mineral compositions were analyzed. The results showed that RAFs from waste RACs were not adequate to structural concrete alone because they belonged to coarse tape and their mineral compositions were adverse to the best growth of strength of RACs.

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