Experimental Study of Compressive Strength of Recycled Aggregate Concrete written by Yati R. Tank, Jigar P. Parmar, Darpan H. Gadhiya published on 2014/04/25 download full article with reference data and citations
May 14, 2015· This paper discusses the suitability of producing concrete with 100 % recycled aggregate to meet durability and strength requirements for different applications. Aggregate strength, gradation, absorption, specific gravity, shape and texture are some of the physical and mechanical characteristics that contribute to the strength and durability of concrete.
Jun 30, 2018· Considering on the current difficulties of predicting the compressive strength of recycled aggregate concrete, this paper proposes a prediction model based on deep learning theory. First, the deep features of water-cement ratio, recycled coarse aggregate replacement ratio, recycled fine aggregate replacement ratio, fly ash replacement ratio as
The compressive strength of recycled aggregate concrete was found to range between 18 and 65 MPa, and therefore a prediction equation is proposed for recycled aggregate concrete
Recycled aggregate concrete (RAC) mixtures obtained a higher compressive strength than the conventional concrete (CC) after 24 h, except for HR-100-40 concrete which obtained a similar result . As Fig. 4 shows, the CC achieved in 24 h, 56% of its strength at 28 days.
It was found that the statistical characteristics of the compressive strength of recycled aggregate concrete do not differ very much from those of normal concrete (NC) with similar strength
Dec 02, 2019· This study investigated the mechanical behavior of normal strength (NS) and high strength (HS) concrete containing recycled fine aggregates (RFAs). A high slump mixing design was employed, which may be potentially used as filled structural concrete. The compressive strength, tensile strength, and elastic modulus were measured according to the RFA replacement ratio and
recycled aggregate concrete and design optimal mix proportions. Artificial neur-al network (ANN) has good potential to be used as a tool for predicting the compressive strength of recycled aggregate concrete 12]. Analysis was con- [ducted to study the practicability of using the ANN theoretical model as predic-tion tool. The results showed that
Abstract. This paper deals with the correlation between the time evolution of the degree of hydration and the compressive strength of Recycled Aggregate Concrete (RAC) for different water to cement ratios and initial moisture conditions of the Recycled Concrete Aggregates (RCAs).
Mar 01, 2020· Aggregates are the major constituent (ingredient) in concrete, making up 60% to 70% of the volume of concrete. Aggregates influence the workability of plastic concrete and also the durability, strength, thermal properties, and density of hardened concrete. Particle size divides aggregates into two categories: fine and coarse. Most fine aggregates are sand and contain particles smaller than 3/8
Study of recycled concrete aggregate quality and its relationship with recycled concrete compressive strength using database analysis • 3. Materiales de Construcción 66 (323), July–September 2016, e089.
This chapter has been prepared with the hope that its readers will become interested in lightweight concrete (LWC). Therefore, after a brief background of lightweight concrete, different types of LWC will be introduced and then LWC made of lightweight aggregates (LWA) will be specifically discussed. Compressive strength and density of LWC are the main points of interest in this chapter. In
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
analysis of compressive strength between conventional concrete and recycled coarse aggregate concrete pardeep*; dr. arvind dewangan** *ctm (civil engineering) final semester student, department of civil engineering, hctm technical campus, kaithal, haryana. **associate professor, department of
The Estimation of Compressive Strength of Normal and Recycled Aggregate Concrete 421 water-cement ratio) concrete mixtures explanation is different. For water-cement ratios under 0.3, disproportionately high increases in the compressive strength can be achieved with very small reductions in water-cement ratio. A significant improvement in the
Basic concrete properties like compressive strength, flexural strength, workability etc. are explained here for different combinations of recycled aggregate with natural aggregate. Codal guidelines of recycled aggregates concrete in various countries are stated here with their effects, on concreting work.
To apply those models, it was necessary to estimate before concrete density and compressive strength at 28 days, which is obtained with the expressions proposed by Thomas et al. : where the coefficients and depend on the recycled coarse aggregate substitution ratio and are listed in Table 2.
A total of 27 concrete mixtures with three replicates were considered by varying the levels of key factors affecting compressive strength of concrete, namely, w/c ratio, recycled coarse /natural coarse aggregate ratio, and recycled fine/ natural fine aggregate ratio .The experimental data were utilized to carry out analysis of variance (ANOVA
The ultimate strength of concrete is related to water/cement ratio and the size, shape, and strength of the aggregate used. Concrete with lower water/cement ratio (down to 0.35) makes a stronger concrete than a higher ratio. Concrete made with smooth pebbles is weaker than that made with rough-surfaced broken rock pieces for example.
Recycled Concrete as Aggregate for Structural Concrete Abstract: A comparative analysis of the experimental results of the properties of fresh and compressive strength testing and one precast reinforced concrete column, which had inappropriate dimensions (Figure 1). The strength class of old concrete cubes was C30/37 and the corresponding
Strength variation of concrete produced from recycled aggregate is higher than concrete made from natural aggregate. For the recycled aggregate concrete, it would be necessary to add more cement in concrete made with 100% of recycled aggregate in order to achieve the same workability and compression strength as conventional concrete.
A nonlinear finite element model for the square recycled aggregate concrete-filled steel tube stub column under axial compression has been developed using the general-purpose finite element program. An equivalent stress-strain model is proposed to simulate the behavior of the recycled aggregate concrete confined by a steel tube.
Sep 19, 2018· The use of recycled concrete aggregate as a building material is now gaining popularity in China’s construction materials. High-performance concrete, stub columns, and beams can be cast by recycled concrete aggregates, and have good mechanical properties according to literature reported [24–27]. However, few studies have been conducted on
on the properties of concrete with recycled aggregates, as an alternative material to coarse aggregate in structural concrete. The scope of this project is to determine and compare the high strength concrete by using different percentage of recycled aggregates.
Recycled concrete aggregate was produced by crushing of ―old‖ concrete cubes used for compressive strength testing and one precast reinforced concrete column, which had inappropriate dimensions (Figure 1).
A nonlinear finite element model for the square recycled aggregate concrete-filled steel tube stub column under axial compression has been developed using the general-purpose finite element program. An equivalent stress-strain model is proposed to simulate the behavior of the recycled aggregate concrete confined by a steel tube. The results
This study appraises compressive strength test data on natural aggregate concrete (NAC) and analogue RAC specimens, intending to: Evaluate the suitability of the cubic to cylindrical NAC conversion factors of Eurocode 2 and EN-206 for RAC with recycled aggregates (RA) sourced from concrete
Compressive strength of hardened concretes made from recycled concrete coarse aggregates was studied as a function Of the compressive strength of original concretes from which the coarse aggregates were derived Also studied were properties of fresh concretes made from recycled aggregates, gradings of crusher products, properties of recycled
ABSTRACT: Compressive strength is the basic mechanical properties and one of the indicators to determine the performance of a concrete. In this paper, the effects of various percentages (0%, 25%, 50%, 75%, 100%) of Recycled Aggregate (RA) on compressive strength of Recycled Aggregate Concrete (RAC) were investigated. RA is used to
caused by concrete waste, Recycled Aggregate Concrete (RAC) technology is considered as one of the main candidates for ecolog-ical concrete development . However, the variability in the characteristics of RA and RAC preventsthe use of RA further.For example,the use of RCAcan lead to reduction of up to 40% in compressive strength [1,3]. Low
Sep 19, 2018· Waste concrete make into recycled aggregates, replacing normal natural aggregates has become an important issue, and researched by scientists around the world [1–23]. The use of recycled concrete aggregate as a building material is now gaining popularity in
Steel fiber reinforced recycled coarse aggregate concrete (SFRCAC) is an impact minimisation building material. Mixture proportion design method of SFRCAC is developed in this paper to obtain concrete with target strength and workability, which can be used in structural members.
To improve the strength of concrete made with RCA, a method has been investigated i.e. by applying acoustic emission technique for detecting micro-cracking in concrete under compression . The compressive strength and stress–strain curves of recycled aggregate concrete (RAC) with different replacement percentages
Xiao’s research showed that the compressive strength of concrete could be improved by adding a The screening analysis of fine aggregate and coarse aggregate was carried out in accordance with the Chinese standard JGJ 52-2006 . After the preparation, the physical properties of two kinds of coarse aggregate were tested according to the Chinese standard GBT 14685-2011,as shown in Table 2
A Comparative Analysis of Modulus of Rupture and Splitting Tensile Strength of Recycled Aggregate Concrete Akinkurolere Olufunke Olanike Department of Civil Engineering, Ekiti State University, Ado-Ekiti, Nigeria. Abstract: In this experimental investigation, an attempt is made to report the comparative analysis of the
Recycled concrete aggregates produced from all but the poorest quality original concrete can be expected to pass the same tests required of conventional aggregates. Recycled concrete aggregates contain not only the original aggregates, but also hydrated cement paste. This paste reduces the specific gravity and increases the porosity compared to
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