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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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.

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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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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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Effect of Recycled Concrete Aggregate on Rutting and ...

Oct 10, 2019  This study aims to evaluate the influence of the addition of coarse recycled concrete aggregate (CRCA) on the rutting and stiffness of Ontario Superpave mixtures. Mix designs of asphalt mixtures were performed for two types of CRCA at various proportions.

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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.

get price

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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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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Effect of recycled concrete coarse aggregates on service ...

Feb 01, 2020  Effect of recycled concrete aggregates on strength and stiffness gain of concrete and on bond strength of steel prestressing strand. PCI J (2018), pp. 87-105. View Record in Scopus Google Scholar. M. McGinnis, M. Davis, A. de la Rosa, B. Weldon, Y. Kurama.

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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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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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Freeze and thaw effect on the stiffness properties of ...

Stiffness properties affecting the road performance of recycled concrete aggregates (RCA) should be determined before using them in the road subbase and base course. On the other hand, the freeze and thaw (F-T) negatively affects the long-term performance of the road. In this study, the F-T effect on the stiffness

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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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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 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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Recycled Aggregates - Portland Cement Association

Recycled Aggregate Characteristics. The crushing characteristics of hardened concrete are similar to those of natural rock and are not significantly affected by the grade or quality of the original concrete. Recycled concrete aggregates produced from all but the poorest quality original concrete can be expected to pass the same tests required ...

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

Cite this paper as: Lovati L., Tatsuoka F., Tomita Y. (2007) Effects of Some Factors on the Strength and Stiffness of Crushed Concrete Aggregate.

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Effect of Recycled Concrete Aggregate on Rutting and ...

Effect of Recycled Concrete Aggregate on Rutting and Stiffness Characteristics of Asphalt Mixtures Hanaa Khaleel Alwan Al-Bayati1 and Susan L. Tighe, Ph.D., P.Eng.2 Abstract ...

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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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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).

get price

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.

get price

Freeze and thaw effect on the stiffness properties of ...

Stiffness properties affecting the road performance of recycled concrete aggregates (RCA) should be determined before using them in the road subbase and base course. On the other hand, the freeze and thaw (F-T) negatively affects the long-term performance of the road. In this study, the F-T effect on the stiffness

get price

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 ...

get price

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.

get price

Freeze–Thaw Effects on Stiffness of Unbound Recycled Road

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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Environmental Suitability of Recycled Concrete Aggregates ...

investigated the effects of freeze/thaw cycles, curing time, liquid-to- solid ratio, pH, and particle sizes on the leaching behavior of metals leached from RCA materials. MATERIALS Two conventional graded aggregate base (GAB) materials and two recycled concrete aggregate materials were used in

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

Cite this paper as: Lovati L., Tatsuoka F., Tomita Y. (2007) Effects of Some Factors on the Strength and Stiffness of Crushed Concrete Aggregate.

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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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Recycled Aggregates - Portland Cement Association

Recycled Aggregate Characteristics. The crushing characteristics of hardened concrete are similar to those of natural rock and are not significantly affected by the grade or quality of the original concrete. Recycled concrete aggregates produced from all but the poorest quality original concrete can be expected to pass the same tests required ...

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Effects of Aggregate Top Size on Bituminous Concrete ...

An experimental program consisting of resilient modulus and creeprebound testing was conducted to determine the effects of aggregate top size on the stiffness and resistance to permanent deformatio...

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Section 6F-1 - Pavement Subbase Design and Construction

Mar 06, 2020  Recycled materials with the required particle distribution, high stiffness, low susceptibility to frost action, high permeability, and high resistance to permanent deformation can be successful subbases. Recycled aggregate can solve disposal problems, conserve energy, and lower the cost of road construction. 1.

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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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Physical, Deformation, and Stiffness Properties of ...

The construction sector is currently struggling with the reuse of waste originating from the demolition and modernization of buildings and roads. Furthermore, old buildings are gradually being replaced by new structures. This brings a significant increase of concrete debris to waste landfills. To prevent this, many studies on the possibilities of recycling concrete, known as recycled concrete ...

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