concluded as, it can be seen that recycled concrete aggregate as natural coarse aggregate has no detrimental effect on the strength and performance of concrete when designed correctly.An experimental study was carried out to investigate the properties of concrete with recycle aggregates.
May 05, 2016 · The possible solution is to reuse recycled concrete aggregate in place of natural aggregate, which reduces landfill disposal, conserving the primary resources and reducing the transportation cost and promote the sustainable development. Hence its need to study the structural properties of recycled aggregate concrete.
Abstract This paper presents the influence of different amounts of recycled coarse aggregate (RCA) obtained from a demolished Town Club building of Banki, N.A.C of Cuttack region, about 25 years old on the properties of self compacting concrete (SCC) and compared the results with normal vibrated concrete (NVC) containing 100% natural coarse aggregate (NCA). Important properties such as ...
structural concrete to get mechanical properties of concrete produced with treated coarse RA and fine recycled aggregate which are comparable to concrete with natural coarse and fine aggregates. Initially, physical and mechanical properties of natural materials and RA are studied and compared. A mix proportion for M20 grade was then calculated ...
PROPERTIES OF CONCRETE MADE WITH NORTH CAROLINA RECYCLED COARSE AND FINE AGGREGATES
After decades of studies, the partial use of coarse recycled aggregates is considered acceptable, yet the use of fine recycled aggregates (FRAs) is highly restricted in concrete production. This restriction is based on technical concerns; for example, the presence of FRAs in concrete allegedly hinders its performance beyond acceptance.
PDF | On Sep 1, 2002, R. dos Santos and others published Mechanical Properties of Concrete with Coarse Recycled Concrete Aggregates | Find, read and cite all the research you need on ResearchGate
Permeability properties of self-compacting concrete with coarse recycled aggregates L.A. Pereira-de-Oliveira⇑, M.C.S. Nepomuceno, J.P. Castro-Gomes, M.F.C. Vila University of Beira Interior – C-MADE, Centre of Materials and Building Technologies, Covilhã, Portugal
It has been observed that the recycled coarse aggregate is used as normal aggregate. The workability of the concrete is increased by using RCA. Maximum properties of Recycled coarse aggregate have shown good with a little variation. Recycled aggregate materials produce harsh mixes with lower workability than Natural aggregates.
Properties of High-Workability Concrete with Recycled Concrete Aggregate Using the same W/C ratio, S/A ratio and HRWR dosage of control concrete, four different concretes were designed with RCA 30
A new method for proportioning recycled aggregates concrete (RAC) is used to check its feasibility under the Spanish context. First, an extensive experimental campaign has been done, with the purpose of check and analyze the applicability of the EMV method with two Spanish recycled concrete aggregates (RCA). The aim of the second part of the investigation, was to elaborate an adaptation of the ...
concrete and also the durability , strength, thermal properties, and density of hardened concrete. This Bulletin describes types of aggregates normally used in concrete, aggregate properties affecting performance of the concrete, tests used to measure aggregate properties, and methods used to obtain test samples. Normalweight as well
This paper investigates the influence of different amounts of recycled coarse aggregates obtained from a demolished RCC culvert 15 years old on the properties of recycled aggregate concrete (RAC). A new term called “coarse aggregate replacement ratio (CRR)” is introduced and is defined as the ratio of weight of recycled coarse aggregate to the total weight of coarse aggregate in a concrete ...
Since, strength and durability of recycled aggregate concrete is lower than that of normal aggregate concrete, the use of recycled aggregate has not been significant. In order to improve physical properties of concrete using recycled coarse aggregate, blast furnace slag sand has been proposed.
The coarse recycled concrete aggregate was obtained by crushing a laboratory produced primary concrete at age of 28 days. About 250 cubes of dimension 15 ∗ 15 ∗ 15 cm were crushed to produce the recycled coarse aggregates using mix design No.1 ().
Abstract. This research was conducted with the use of recycled aggregate as modification. In terms of the use of recycled aggregate, the percentage of recycled aggregate should be determined because the strength of concrete would not be obtained by the high percentage of recycled aggregate.The scope of study is about comparison between recycle coarse aggregate and natural aggregate in terms of ...
recommendations for guidelines on using RCA in concrete. It has been shown by the authors and other researchers that it is possible to create strong and durable concrete mixtures using RCA as coarse aggregate in volume replacement levels of natural coarse aggregate up to 100%.
This project reports the suitability of recycled coarse aggregate as 100% replacement in concrete at different water-cement ratio (0.45, 0.50 and 0.55) and attempts to compare the mechanical and physical properties of recycled coarse aggregate with that of conventional coarse aggregate concrete. It
concrete, lightweight aggregate, asphalt concrete, concrete exposure to high temperatures and road construction. The use of crushed waste as aggregate in concrete has began in Europe since the Second world War . In Japan, after the Second world War, many buildings are constructed from crushed waste because of the need
• The sixth concrete mix had 100% of recycled coarse aggregate (R100). As all the other variables were kept constant, this research enabled us to determine the influence of the coarse recycled aggregate amount (0%, 20%, 40%, 60%, 80% and 100%) on tested concrete properties. The experimental investigation was done on different grades of concrete
the properties of concrete containing recycled coarse aggregate and fly ash. The replacement of natural aggregate by recycled coarse aggregate was in the range of 25% to 100%. In addition to this ordinary Portland cement was partially replaced by fly ash. From the study it was found that fly ash improves the
Based on the result of properties of Recycled Aggregate and natural coarse aggregate, it can be seen that specific gravity for natural coarse aggregate is higher than Recycled Aggregate, and the value of specific gravity for natural coarse aggregate is 2.64, it means that natural coarse aggregate meet the requirement of specific gravity.
out on evaluating recycled concrete aggregate (RCA) of high quality produced through a protocol that preserves the original properties of the concrete to be recycled. Results showed that concrete with RCA of preserved quality performed significantly better in compressive strength, drying shrinkage, and salt scaling resistance.
Research Article Properties of Self-Compacting Concrete with Recycled Coarse Aggregate W.C.Tang, 1 P.C.Ryan, 2 H.Z.Cui, 3 andW.Liao 4 School of Architecture and Built Environment,e University of Newcastle, Callaghan, NSW , Australia
aggregates that come from the demolition of hydraulic concrete is used to generate recycled hydraulic. concrete, a material that could lessen costs, decrease pollution and cheapen construction.
Shear strength of recycled aggregate concrete is lesser than of normal concrete. This is because the recycled aggregate from field-demolished concrete for example can be relatively weaker than a typical natural aggregate. In general, there is a 10% decrease in strength when recycled coarse aggregates are used. Uses of Crushed Concrete Aggregates
The reuse potential of tire chips as coarse aggregates in pavement concrete was examined in this research by investigating the effects of low- and high-volume tire chips on fresh and hardened concrete properties. One concrete control mixture was designed, which well exceeds CDOT Class P concrete requirements. The coarse aggregate
several important properties such as impact resistance, toughness, failure characteristics, thermo-physical properties, durability performance of cement mortar and concrete containing plastic as aggregate need more study. This study aims at examining the effect of recycled plastic in concrete as coarse
Contaminants found in recycled concrete degrade its strength. Contaminants could include plaster, soil, wood, gypsum, asphalt, plastic, or rubber. (8) Etxeberria et al. (13) studied concrete made with recycled coarse aggregates obtained from crushed concrete.
- the third concrete mix had 100% of recycled coarse aggregate (R100). As all the other variables were kept constant, this research enabled us to determine the influence of the coarse recycled aggregate amount (0%, 50% and 100%) on tested concrete properties. The following properties of concrete were selected for testing:
the use of crushed concrete as both coarse and fine aggregates in the new concrete. No virgin aggregates were used. The primary objectives of this study were to evaluate (1) the material properties of recycled concrete aggregate (RCA), (2) their effect on paving operations, and (3) in-situ concrete properties to identify the reasons for
The utilisation of recycled concrete aggregate (RCA) in Self-Compacting Concrete (SCC) has the potential to reduce both the environmental impact and financial cost associated with this increasingly popular concrete type. However, to date limited research exists exploring the use of coarse RCA in SCC. The work presented in this paper seeks to build on the existing knowledge in this area by ...
1. In their study, they use recycled coarse aggregates obtained by crushed concrete for concrete production. 2. Four different recycled aggregate concretes were produced; made with 0%, 25%, 50% and 100% of recycled coarse aggregates, respectively. 3. The mix proportions of the four concretes were designed in order to achieve the same