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effects of recycled concrete aggregate on stiffness and

effects of recycled concrete aggregate on stiffness and

Effects of recycled concrete aggregate on stiffness and ...

Apr 01, 2017  The concrete was covered with an asphalt layer, and was not directly exposed to environmental effects. At the time of removing and recycling, the concrete was more than 30 years old and was classified as compressive strength class C35/45. The concrete was crushed to a maximum aggregate size of 22.4 mm. In addition to RCA (98%), the used ...

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Effect of recycled concrete aggregates on strength and ...

This paper investigates the effect of recycled con-crete aggregate (RCA) on the rate of concrete compressive strength and stiffness gain with time and on the bond strength between seven-wire steel prestressing strand and concrete. The use of RCA did not have a significant effect on the rate of concrete compressive strength or stiffness

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Effects of recycled concrete aggregate on stiffness and ...

The objective of this research was to assess the possibility of using recycled concrete aggregate (RCA) in asphalt mixtures. The experimental research included 10 asphalt mixtures with partial natural aggregate substitution by RCA, which ranged from 15% to 45% of fine (⩽4 mm), coarse (4/22.4 mm) and both fine and coarse aggregate.The optimum bitumen content increased with increasing RCA content.

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Effect of recycled concrete aggregates on strength and ...

The RCA sources included rejected precast concrete, construction demolition concrete, and returned ready-mixed concrete. The use of RCA did not have a significant effect on the rate of concrete compressive strength or stiffness gain. Furthermore, RCA resulted in an effect (decrease or increase) in the strand bond strength that was consistent ...

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(PDF) Effects of recycled concrete aggregate on stiffness ...

PDF The objective of this research was to assess the possibility of using recycled concrete aggregate (RCA) in asphalt mixtures. The experimental... Find, read and cite all the research you ...

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Effects of recycled concrete aggregate on stiffness and ...

The objective of this research was to assess the possibility of using recycled concrete aggregate (RCA) in asphalt mixtures. The experimental research included 10 asphalt mixtures with partial natural aggregate substitution by RCA, which ranged from 15% to 45% of fine (⩽4 mm), coarse (4/22.4 mm) and both fine and coarse aggregate.The optimum bitumen content increased with increasing RCA content.

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(PDF) Effects of recycled concrete aggregate on stiffness ...

PDF The objective of this research was to assess the possibility of using recycled concrete aggregate (RCA) in asphalt mixtures. The experimental... Find, read and cite all the research you ...

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Effects of Recycled Aggregate on Concrete Mix and Exposure ...

Jun 25, 2019  The unit weight of the concrete ranged from 2365 to 2175 kg/m 3, depending on aggregate content (Figure 6).Increasing the recycled aggregate content reduces the unit weight and density of the concrete, resulting in lighter concrete (Figure 6).The unit weights of the 15%, 20%, and 25% mixes were reduced by 8%, 11%, and 11.5%, respectively, compared to plain concrete.

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Stiffness Properties of Recycled Concrete Aggregates as ...

Mar 02, 2021  Recycled concrete aggregates obtained from CD waste, which can be used as natural aggregate replacements and mixed with natural aggregates, are a high-quality alternative for road subbase and base courses in Turkey [4, 5]. However, it is necessary to determine the mechanical and stiffness properties of the aggregate replacements before use ...

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Strength and stiffness of compacted crushed concrete aggregate

Dec 01, 2013  A comprehensive series of drained triaxial compression tests were performed on crushed concrete aggregate (CCA) moist as compacted. When compared to ordinary natural well-graded gravelly soils, the peak strength and stiffness increase more significantly with dry density, while the effect of the degree of saturation during compaction is much less significant.

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The effect of recycled concrete aggregate and steel slag ...

Oct 01, 2012  Construction debris from construction and demolition (CD) work constitutes a large proportion of solid waste, as shown in Table 1.Among various types of construction materials, concrete is the most significant element of recycled aggregates, and approximately 75%, 70%, 40% and 70% of waste collected from construction sites, demolition sites, general civil work and renovation work

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Understanding variability in recycled aggregate concrete ...

This paper investigates the effects of adhered mortar content on the mechanical properties of recycled aggregate concrete (RAC) systems using two-dimensional finite element analysis of RAC specimens subjected to uniaxial compression. ... Statistical inferences on the effects of variability in material stiffness and adhered mortar content were ...

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Stress–Strain Behavior of FRP-Confined Recycled Aggregate ...

The same FRP confinement stiffness was adopted for the columns of different sizes so that the possible column size effect could be examined. The test results showed that the size effect indeed existed in the test FRP-confined square RAC columns and the presence of recycled aggregate amplified such effect.

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Freeze–Thaw Effects on Stiffness of Unbound Recycled Road Base

Aug 22, 2013  Freeze–thaw cycling caused a decrease in the stiffness (i.e., the summary resilient modulus) of RAP samples and class 5 aggregate because of the effect of the water retained in the pores. An increase in the stiffness of RCA was observed over 20 freeze–thaw cycles and is attributed to self-cementitious behavior of crushed concrete.

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Use of Recycled Concrete Aggregates in Precast/Prestressed ...

Jan 01, 2016  This paper describes a preliminary investigation on factors related to the use of recycled concrete aggregates (RCA) in precast/prestressed concrete applications. In particular, the effects of RCA are experimentally investigated for: 1) the bond between seven-wire prestressing steel strand and concrete; 2) the compression strength gain of ...

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Rapporti di organizzazioni: "Concrete frames" – Grafiati

Concrete-filled steel tubular structural members can be recognized as an effective mean to improve the mechanical behavior in terms of strength, stiffness, ductility, and energy dissipation for the initial recycle aggregate concrete deficiencies compared with natural aggregate concrete.

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The Impact of Recycled Concrete Aggregate on the Stiffness ...

This study examined the mechanical properties (stiffness, fatigue, and low-temperature cracking resistance) of road asphalt mixtures with partial substitution (15%, 30%, or 45%) of fine natural aggregate, coarse natural aggregate, and both fine and coarse natural aggregate by recycled concrete aggregate (RCA).

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Effects of recycled concrete aggregate on stiffness and ...

Abstract. The objective of this research was to assess the possibility of using recycled concrete aggregate (RCA) in asphalt mixtures. The experimental research included 10 asphalt mixtures with partial natural aggregate substitution by RCA, which ranged from 15% to 45% of fine ( le c.4 mm), coarse (4/22.4 mm) and both fine and coarse aggregate.

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Freeze–Thaw Effects on Stiffness of Unbound Recycled Road Base

Aug 22, 2013  Freeze–thaw cycling caused a decrease in the stiffness (i.e., the summary resilient modulus) of RAP samples and class 5 aggregate because of the effect of the water retained in the pores. An increase in the stiffness of RCA was observed over 20 freeze–thaw cycles and is attributed to self-cementitious behavior of crushed concrete.

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Effects of Some Factors on the Strength and Stiffness of ...

A series of consolidated drained triaxial compression (TC) tests were performed on a crushed concrete aggregate (CCA) compacted using three different levels of energy. A wide range of moulding water content, w, and two different confining pressures were employed. The compressive strength and stiffness of the tested CCA when highly compacted at water content close or slightly higher than the ...

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(PDF) The effect of Recycled Concrete Aggregate and ...

The effect of Recycled Concrete Aggregate and Aluminum Filings on the Properties of Hot Asphalt Mixture. H. Al-saedi. Download PDF. Download Full PDF Package. This paper. A short summary of this paper. 37 Full PDFs related to this paper. READ PAPER.

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Effects of Some Factors on the Strength and Stiffness of ...

Wainwright P. J., Yu J. and Wang Y. (1993): Modifying the performance of concrete made with coarse and fine recycled concrete aggregates, EIK Lauritezen (Ek.), Demolition and Reuse of Concrete, Guidelines for Demolition and Reuse of Concrete and Masonry, pp.319–330.

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Behaviour of intermediate stiffness culverts with recycled ...

This study investigates the effects of the use of two different types of recycled aggregates with known characteristics as backfill materials in newly built cantilever reinforced concrete ...

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Modeling of Aggregate Stiffness and Its Effect on ...

stiffness of aggregate phase and predicting the shrinkage of concrete as well. From the test and analysis results, high aggregate contents induce great stiffness. As a result, it will have effect on small shrinkage. KEYWORDS: aggregate stiffness, shrinkage, two-phase material, contact angles. scopic model is proposed in this study. This paper ...

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Strength and stiffness of compacted crushed concrete

Strength and stiffness of compacted crushed concrete aggregate Fumio Tatsuokaa,n, Yu-Ichi Tomitab, Yusuke Iguchic, Daiki Hirakawad aDepartment of Civil Engineering, Tokyo University of Science (TUS), Chiba, Japan bTokyu Construction Co. Ltd., Japan cChemical Grout Co. Ltd., Japan dDepartment of Civil and Environmental Engineering, National Defence Academy of Japan, Japan

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(PDF) EXPERIMENTAL STUDY ON E-WASTE CONCRETE AND

This paper presented an experimental work have been done to determine the effects of recycled concrete aggregate (RCA) under the curing conditions of 2.1 pH in

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Use of Recycled Concrete Aggregates in Precast/Prestressed ...

Jan 01, 2016  This paper describes a preliminary investigation on factors related to the use of recycled concrete aggregates (RCA) in precast/prestressed concrete applications. In particular, the effects of RCA are experimentally investigated for: 1) the bond between seven-wire prestressing steel strand and concrete; 2) the compression strength gain of ...

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Size Effect on Recycled Concrete Strength and Its ...

In recent years, research on recycled aggregate concrete has become a hot issue in the field of civil engineering. This paper mainly studies the size effects on compressive and tensile strengths of the recycled aggregate concrete. Firstly, four sets of recycled concrete cube specimens with different sizes are produced in the laboratory.

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Recycled aggregates reduce environmental impact ...

Sep 01, 2015  “Because of the greater effect of RCA [recycled concrete aggregates] on concrete stiffness and the ability of RCA concrete to achieve similar strengths as natural concrete, the limiting factor for the increased use of recycled concrete could be how RCA concrete performs under day to day service loads and conditions over a long period of time ...

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Performance of recycled aggregate concrete: Strength and ...

Performance of recycled aggregate concrete: Strength and stiffness Jorge de Brito • CERIS is a research unit that operates in the Built and Natural Environment sector and is registered with the Portuguese Foundation for Science and Technology (FCT). • MISSION - The mission of CERIS is to create and disseminate scientific knowledge and to promote innovation

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