PDF Mathematical model of Concrete water penetration with

Mathematical model of Concrete water penetration with recycled aggregate replacement International organization of Scientific Research 26 | P a g e q i = Unit expenditure or average speed in cross-section, in a time interval of one hour (cm/s). A= Cross-sectional area of the test slice(cm2). Ve i = Effective flow rate in the specimen mass(cm/s).

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Advances in Construction and Demolition Waste Recycling

10. Recycled aggregates (RAs) for roads 11. Recycled aggregates (RAs) for asphalt materials 12. Self-compacting concrete with recycled aggregates 13. The suitability of concrete using recycled aggregates (RAs) for high-performance concrete 14. Influence of curing conditions on recycled aggregate concrete 15. Long term performance of recycled

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Recent advances in structural fibre-reinforced concrete

Concerning the aggregate size, not only an increase of fines/total aggregates is typically adequate but also a limited maximum aggregate size (D ag,max). This limitation of D ag,max influences the effectiveness of reinforcement in hardened state because it determines fibre distribution.

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xkb.xauat.edu.cn

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A novel method to predict the mesostructure and

Abstract The permeability and compressive strength of pervious concrete are mainly determined by its mesostructures including the pore, cement paste and aggregate. However, most of the current performance prediction methods have not considered the influence of mesostructural characteristics on the performance reasonably and comprehensively. In this study, a novel method based on image

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FRP-Confined Recycled Coarse Aggregate Concrete

The in situ application of recycled aggregate concrete (RAC) is of great significance in environmental protection and construction resources sustainability. However, it has been limited to nonstructural purposes due to its poor mechanical performance. External confinement using steel tubes and fiber

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Materials | Free Full-Text | Numerical Simulation of

Based on the base force element method (BFEM), the dynamic mechanical behavior of concrete under uniaxial compression loading at different strain rates is investigated. The concrete can be considered as a three-phase composite material composed of aggregate, cement mortar, and interfacial transition zone (ITZ) on the meso-level. A two-dimensional random aggregate model is generated by the

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Numerical Simulation on Damage and Failure of Recycled

A random aggregate model of recycled aggregate concrete is developed in this paper on the base of a mixture ratio. Combining a lattice model with random aggregate of recycled aggregate concrete, lattice elements in the lattice model of recycled aggregate concrete can be classified into five types: (1) nature aggregate, (2) old hardened mortar, (3) new hardened mortar, (4) old interface

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Predictive Models for Evaluation of Compressive and Split

In an attempt to stop the recurrence of experimental studies and the wasting of scarce resources, the present study proposed statistical models for the evaluation of the compressive and split tensile strengths of the recycled aggregate concrete (RAC) comprising Lathe Waste Steel Fibre (LWSF), utilizing the Artificial Neural Network (ANN).

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PDF] Download A Conceptual Model For Designing Recycled

By extending Abrams' Law for Recycled Aggregate Concrete, it represents a first step in the formulation of a general model for predicting the properties of RAC. The theoretical approach presented here addresses an important gap in the literature and is expected to stimulate new research on the use of this more sustainable form of concrete in structural applications.

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Recycled Concrete Aggregate

Journal of Biomimetics, Biomaterials and Biomedical Engineering Materials Science. Defect and Diffusion Forum

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Advanced Numerical Models for the Analysis of Sustainable

May 30,  · Bazant Z, Tabbara M, Kazemi M, Pijaudier-Cabot G (1990) Random particle model for fracture of aggregate or fiber composites. J Eng Mech, ASCE 116:1686–705 Google Scholar Beghini A, Bazant Z, Zhou Y, Gouirand O, Caner F (2007) Microplane model m5f for multiaxial behavior and fracture of fiber reinforced concrete.

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Leaching Characterisation and Geochemical Modelling of

Leaching Characterisation and Geochemical Modelling of Minor and Trace Elements Released From Recycled Concrete Aggregates. The pH dependent release of Cd, Cr, Cu, Mn, Mo, Ni, Pb, V, and Zn from different recycled concrete aggregate samples was determined.

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Environmental impact of concrete - Wikipedia

Aggregate base gravel is laid down as the lowest layer in a road, with fresh concrete or asphalt placed over it. Crushed recycled concrete can sometimes be used as the dry aggregate for brand new concrete if it is free of contaminants, though the use of recycled concrete limits strength and is not allowed in many jurisdictions.

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Toward a codified design of recycled aggregate concrete

The use of recycled aggregate (RA) to produce recycled aggregate concrete (RAC) is a proven way of decreasing the consumption of natural aggregate (NA) and the landfilling of construction and demolition waste. However, adoption of codes for the design of RAC and RAC structures has been lacking.

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Numerical Modelling of Steel Fiber Recycled Aggregate

and evaluate the nonlinear behavior of reinforced concrete (RC) deep beams made with recycled concrete aggregates (RCA) a nd steel. fibers (SF). The models had a width o f 150 mm, depth of 500 mm

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