Recycled aggregates are used in concrete and the concrete is called as Recycled Aggregate. Concrete (RAC). This paper aims at predicting the 28 day compressive strength of RAC using two techniques namely Artificial Neural Network (ANN) and Nonlinear regression. (NLR). Five ANN and NLR models were developed
This study evaluated the effect of fully replacing natural aggregate (NA) with several sources of recycled concrete aggregate (RCA) on the various mechanical properties of multiple concrete mixtures having equivalent compressive strength and slump (compressive strengths between 40 and 60 MPa and slumps between 75
In this study, concrete cubes waste from a concrete testing laboratory is crushed and recycled as natural coarse aggregate (NA) replacement (0% control, 30% and 50% by mass) in grade 15, 25 and 40 concrete. The recycled concrete waste aggregate (RCWA) was tested for grading, specific gravity, percent absorption
May 25, 2015 The resistance to mechanical actions such as impact, crushing and abrasion for the recycled concrete aggregates is also lower. The effects of using recycled concrete aggregates instead of natural aggregates in concrete are: reduction in compressive strength up to 25% reduction in modulus of elasticity up
This paper presents a report of an experimental investigation on the effect of complete replacement of natural aggregate by recycled concrete aggregate in the production of concrete on the compressive strength of concrete. Two sets of concrete mixtures of ratios 1:3:6, 1:2:4, 1:11/2:3, 1:1:2 by mass were cast using natural
strengths of concrete made with crushed stone and uncrushed stone. He achieved a better compressive strength with the crushed stone than the uncrushed stone. This strength performance was as a result several factors like water/cement ratio, grading, surface texture, shape, strength, and stiffness of aggregates used.
A 50 per cent partial coarse aggregate replacement was used in one batch to compare against the control and the 100 per cent recycled aggregate concrete. Compressive strength was used to compare the different concrete batch performance. Density was used to indie the degree of particle packing and void content
These materials were crushed in order to obtain a usable aggregate. The properties investigated were the workability and the density of fresh concrete, and the compressive strength, tensile splitting strength, modulus of elasticity and stress strain behavior of hardened concrete. Compressive strength was measured at 7, 14,
[15] studied the influence of different curing conditions on the mechanical properties of recycled concrete coarse aggregate concrete. Four concrete mixes were produced using different replacement ratios, along with four different curing methods. It was concluded that compressive strength did not seem to be affected by
Jan 1, 1983 Compressive strength of hardened concretes made from recycled concrete coarse aggregates was studied as a function Of the compressive strength of original concr.
Figure A.1.1 States that allow the use of recycled concrete aggregate (RCA) in pavement and other appliions. 27. Figure A.3.1 Variation in particle size distribution for a single concrete source crushed in three different plants. 29. Figure A.4.1 Compressive strength variability with respect to percent reported by different
use recycled concrete aggregates as replacement for natural aggregates. Three mix design methods utilizing direct weight replacement, equivalent mortar replacement, and direct volume replacement are compared based on concrete workability, compressive strength, and elastic modulus. A total of 42 mixes were.
This study evaluated the effect of fully replacing natural aggregate (NA) with several sources of recycled concrete aggregate (RCA) on the various mechanical properties of multiple concrete mixtures having equivalent compressive strength and slump (compressive strengths between 40 and 60 MPa and slumps between 75
Dec 5, 2014 The outcomes indie that recycled aggregates caused significant reductions in the attainment of concrete compressive strength (up to 21%) and flexural tensile Keywords: Recycled aggregate concrete, Compressive strength, Flexural tensile strength, Construction waste, Coarse aggregate replacement
ABSTRACT: This work studies the physical and mechanical properties of recycled concrete aggregate (recycled aggregate from concrete waste) and their influence in structural recycled concrete compressive strength. For said purpose, a database has been developed with the experimental results of 152 works selected
Therefore, this study aims to utilize the Recycled Concrete Aggregate (RCA) and ceramic waste which has great potential to replace the natural aggregate in concrete mix with different type of method, admixture, and parameters. This research were focused on compressive strength and water absorption test to determine the
KEYWORDS: Waste Concrete Recycled Aggregate Workability, Compressive Strength. INTRODUCTION. Several comprehensive studies during the past years [113] have dealt with the subject of aggregate supplies and needs and the possible use of waste materials as aggregates for concrete. Critical shortage of natural.
[7] produced recycled aggregate with a maximum size of 32 mm by crushing the waste concrete of laboratory test cubes and precast concrete columns. They found that using highquality aggregate does not affect the compressive strength of the concrete regardless of the replacement ratio of the natural and recycled
The effects of aggregate type, size, and content on the behavior of normal and highstrength concrete, and the relationships between compressive strength, flexural strength, and fracture energy are discussed. The concrete mixtures incorporate either basalt or crushed limestone, aggregate sizes of 12 mm ('h in.) or 19 mm
ABSTRACT: Compressive strength is the basic mechanical properties and one of the indiors to determine the performance of a concrete. In this paper, the effects of various percentages (0%, 25%, 50%, 75%, ) of Recycled. Aggregate (RA) on compressive strength of Recycled Aggregate Concrete (RAC) were
Recycled aggregates are used in concrete and the concrete is called as Recycled Aggregate. Concrete (RAC). This paper aims at predicting the 28 day compressive strength of RAC using two techniques namely Artificial Neural Network (ANN) and Nonlinear regression. (NLR). Five ANN and NLR models were developed