Microstructural Features of Recycled Aggregate Concrete

Microstructural Features of Recycled Aggregate Concrete ...

The use of concrete-recycled aggregates to produce high-performance concrete is limited by insufficient correlation between resulting microstructure and its influence on mechanical performance reproducibility. This work addresses this issue in a sequential approach: concrete microstructure was syste Microstructural Features of Recycled ...

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Microstructural Features of Recycled Aggregate Concrete ...

Microstructural Features of Recycled Aggregate Concrete: From Non-Structural to High-Performance Concrete - Volume 25 Issue 3

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Microstructural Features of Recycled Aggregate Concrete ...

Original Article Microstructural Features of Recycled Aggregate Concrete: From Non-Structural to High-Performance Concrete Diogo Pedro1, Mafalda Guedes2,3*, Jorge de Brito1 and Luís Evangelista1,4 1CERIS, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal; 2CDP2T and Department of Mechanical Engineering, Escola

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Microstructural Features of Recycled Aggregate Concrete ...

Jun 01, 2019  Microstructural Features of Recycled Aggregate Concrete: From Non-Structural to High-Performance Concrete

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Microstructural studies on recycled aggregate concrete ...

Jan 01, 2019  Abstract. This chapter presents a review of current knowledge regarding microstructural features of concrete with recycled aggregates (RAs). The most common and comprehensive tools to assess these features are introduced, with special attention to microscopy techniques. An overview of the microstructure of natural aggregate (NA) concrete is ...

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Microstructural Features of Recycled Aggregate Concrete ...

Mar 04, 2019  Microstructural Features of Recycled Aggregate Concrete: From Non-Structural to High-Performance Concrete. Diogo Pedro CERIS, Instituto Superior Técnico, Universidade de Lisboa,Av. Rovisco Pais, 1049-001 Lisboa,Portugal.

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Microstructural Features of Recycled Aggregate Concrete ...

Microstructural Features of Recycled Aggregate Concrete: From Non-Structural to High-Performance Concrete

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Microstructural Features of Recycled Aggregate Concrete ...

Mar 04, 2019  Microstructural Features of Recycled Aggregate Concrete: From Non-Structural to High-Performance Concrete. Diogo Pedro CERIS, Instituto Superior Técnico, Universidade de Lisboa,Av. Rovisco Pais, 1049-001 Lisboa,Portugal.

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Microstructural Analysis of Recycled Aggregate Concrete

honest step to utilize the recycled aggregates provide that the specified final product will meet the standards. The value of Recycled Concrete Aggregate is additionally but 20 to half hour but natural aggregate in some regions[1]. By using the recycled aggregate the consumption of natural aggregate is

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Microstructural analysis of recycled aggregate concrete ...

Jun 01, 2005  From these three types of recycled coarse aggregate, C1, C2 and C3, and two types of recycled fine aggregate, F1 and F2, four types of suggested RAC applications are recommended for civil and building works, as tabulated in Table 2.Among the three types of civil engineering applications of RAC, namely, CI, CII and CIII with respect to different combinations of recycled coarse aggregate

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© MICROSCOPY SOCIETY OF AMERICA 2013 Microstructural ...

of incorporating recycled aggregate on the formation and morphology of the different concrete hydration products.The results show that concretes with recycled aggregates exhibit typical microstructural features of the transition zone in normal strength concrete. Although overall porosity increases with increasing replacement, the interfacial ...

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Microstructural analysis of recycled aggregate concrete ...

Adoption of recycled aggregate from concrete waste thus becomes a burning issue. The Hong Kong SAR Government has set up a recycling plant in Tuen Mun Area 38 aiming at turning concrete waste into recycled aggregate with a practice note and specifications issued for controlling the quality of recycled aggregate.

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Microstructural Analysis of Recycled Brick Aggregate ...

of recycled brick aggregate at elevated temperatures.The two series of concrete mix i.e.normal aggregate concrete (NAC) and recycled brick aggregate concrete (RBAC) were prepared and subjected to temperatures between 100-800°C at intervals of 100°C for 3 hours of exposure. XRD and SEM analysis were done after

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[PDF] Microstructural analysis of recycled concrete using ...

Abstract This paper reports an investigation of the recycled concrete (RC) microstructure using synchrotron microtomography (μCT) at the Advanced Light Source combined with Scanning Electron Microscopy analysis. The study evaluated the influence of 50% of recycled concrete aggregate (RCA) and its water absorption compensation on the RC microstructure.

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Microstructural analysis of recycled aggregate concrete ...

Adoption of recycled aggregate from concrete waste thus becomes a burning issue. The Hong Kong SAR Government has set up a recycling plant in Tuen Mun Area 38 aiming at turning concrete waste into recycled aggregate with a practice note and specifications issued for controlling the quality of recycled aggregate.

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Mix Design Method for Self-Compacting Recycled Aggregate ...

Mar 03, 2020  This article is on the development of a mix design method for self-compacting recycled aggregate concrete (SCRAC) by considering the adhered mortar content (AMC) on the surface of the aggregate. In this method of mix design, the acceptable percentage of recycled concrete aggregate (RCA) depends on the AMC value.

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Microstructure of Recycled Aggregate Concrete SpringerLink

Jun 17, 2018  The microstructural characterization of concrete prepared with RCA is described in this chapter. The interfacial transition zone (ITZ) between the aggregate and the cement mortar matrix is the most important interface in concrete. Particularly, this is very important in RAC, as the recycled aggregate concrete has more interfaces than normal ...

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View of Microstructural analysis of concretes manufactured ...

Dec 03, 2019  Recycled aggregate concrete (RAC) has a much more complicated microstructure than conventional concrete. ... 100 images, higher magnification objectives were combined in order to observe the smaller pores, microcracks or other microstructural features of the sample.

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Towards sustainability of concrete without chloride limits ...

For each mix, features of fresh concrete and mechanical properties of hardened concrete were studied. Further information was obtained by microstructural and chemical analyses. Additionally, durability was studied in terms of concrete and reinforcement resistance to aggressive environments.

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physiochemical reactions in recycle aggregate concrete

Shear behavior of recycled aggregate concrete after ... Mar 01, 2016 This paper studied the shear behavior of concrete with different levels of recycled coarse aggregate (i.e., 0%, 50% and 100%) after being subjected to different temperatures (i.e., 20 °C, 200 °C, 300 °C and 400 °C).Thirty-six beam specimens with uniform depth and varying width were designed to test their mechanical ...

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© MICROSCOPY SOCIETY OF AMERICA 2013 Microstructural ...

of incorporating recycled aggregate on the formation and morphology of the different concrete hydration products.The results show that concretes with recycled aggregates exhibit typical microstructural features of the transition zone in normal strength concrete. Although overall porosity increases with increasing replacement, the interfacial ...

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Microstructural Analyses of Recycled Aggregate ... - Concrete

Nov 01, 2016  In this study, the effects of recycled glass (RG) and recycled concrete (RC) fine aggregates on acid and sulfate resistance as well as alkali-silica reaction (ASR) expansion of mortar mixture were investigated comparatively. In addition, durability performance of mortar mixtures was supported by microstructural analysis.

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Micro-structural analysis of recycled aggregate concrete ...

Adoption of recycled aggregate from concrete waste thus becomes a burning issue. The Hong Kong SAR Government has set up a recycling plant in Tuen Mun Area 38 aiming at turning concrete waste into recycled aggregate with a practice note and specifications issued for controlling the quality of recycled aggregate.

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Microstructural Analysis of Recycled Aggregate Concrete ...

Microstructural Analysis of Recycled Aggregate Concrete Produced From Two-Stage Mixing Approach. In Hong Kong, as in most cities, waste disposal is a pressing issue due to limited landfill and public filling (land reclamation) areas.

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Microstructural analysis of recycled aggregate concrete ...

Adoption of recycled aggregate from concrete waste thus becomes a burning issue. The Hong Kong SAR Government has set up a recycling plant in Tuen Mun Area 38 aiming at turning concrete waste into recycled aggregate with a practice note and specifications issued for controlling the quality of recycled aggregate.

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Microstructural analysis of recycled brick aggregate ...

There are essential differences between recycled brick aggregate (RBA) and recycled concrete aggregate (RCA). The weak area of RCA is the old mortar attached to the aggregate surface, while the weak area of RBA is its own larger porosity. Silane has a small molecular structure, which can penetrate into the concrete with water as the medium and react with the active functional groups in the ...

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Basic mechanical properties and microstructural analysis ...

Feb 08, 2013  The regeneration aggregate, natural aggregate, PO42.5 R Portland cement, coal fly ash, and slag powders S95 graining blast furnace, homemade P(AA-co-MA)/PEG carboxylic acid water reducing agent, were used together with recycled concrete aggregate in different regeneration rates to prepare recycled concrete (RC). The influences of different renewable aggregate ratios on the basic

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View of Microstructural analysis of concretes manufactured ...

Dec 03, 2019  Recycled aggregate concrete (RAC) has a much more complicated microstructure than conventional concrete. ... 100 images, higher magnification objectives were combined in order to observe the smaller pores, microcracks or other microstructural features of the sample.

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Mechanical and microstructural characterization of ...

The present study correlates the mechanical properties with parameters of the interfacial transition zone (ITZ) of concrete made with recycled aggregates and nano-silica. Compressive and tensile strength of normal concrete and 100% recycled aggregate concrete incorporating 0 and 3% nano-silica is

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Mix Design Method for Self-Compacting Recycled Aggregate ...

Mar 03, 2020  This article is on the development of a mix design method for self-compacting recycled aggregate concrete (SCRAC) by considering the adhered mortar content (AMC) on the surface of the aggregate. In this method of mix design, the acceptable percentage of recycled concrete aggregate (RCA) depends on the AMC value.

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Bond, durability and microstructural characteristics of ...

Other six concrete mixes contain 0%, 40% and 60% GGBFS with each of 50% and 100% recycled coarse aggregate (RCA). Since, the compressive strength is the key property of any concrete, the short- and long-term compressive strength behaviours of these mixes are first evaluated.

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(PDF) Assessment of recycling process induced damage ...

Introduction expected enhanced performance of the recycled aggregate concrete can only be done by clarifying the possible In evaluation of the recycled aggregate characteristics, it microstructural changes brought about by the recycling should be kept in mind that each recycled aggregate particle process on each constituent of the recycled ...

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New Trends in Eco-efficient and Recycled Concrete - 1st ...

Nov 16, 2018  12. Leaching issues in recycled aggregate concrete. SECTION 3. NEW TRENDS IN RECYCLED AGGREGATE CONCRETE RESEARCH 13. Application of alkali-activated industrial waste 14. Microstructural studies on recycled aggregate concrete 15. Mesostructural modelling of recycled aggregate concrete 16. CO2 sequestration in recycled aggregate concrete 17.

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Prediction of the Compressive Strength of Recycled ...

Recycled aggregate concrete (RAC), due to its high porosity and the residual cement and mortar on its surface, exhibits weaker strength than common concrete. To guarantee the safe use of RAC, a compressive strength prediction model based on artificial neural network (ANN) was built in this paper, which can be applied to predict the RAC compressive strength for 28 days.

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