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journals related to optimization of recycled aggregate concrete mixture

(PDF) Optimization of normal and high strength recycled ...

Optimization of normal and high strength recycled aggregate concrete mixtures by using packing model Article (PDF Available) in Cement and Concrete Composites 84 · …

Structural Behavior of Geopolymer Concrete Thin Wall ...

3.3. Recycled Concrete Aggregate (RCA) The recycled concrete is used as coarse and fine aggregates in the concrete mixes to reduce the rubble from the environment and produce a cheap local concrete. Locally available crushed concrete of size 12.5 mm is used as coarse aggregates and of the size 4.75 mm is used as fine aggregates.

A Study on the Strength Properties and Life Cycle ...

For this purpose, the target design compression strength was set at 27MPa. Considering practical use of recycled aggregate, the mixing ratio of recycled fine aggregate was set at 0, 30, 60, and , and the unconfined concrete and hardened concrete were tested.

Mechanistic Performance of Asphalt-Concrete Mixture ...

The mechanistic performance of hybrid asphalt-concrete mixture incorporating coarse recycled concrete aggregate (RCA) was investigated. The hybrid mixture (W3B-RCA-C37) and control mixture (W3B-granite) were evaluated by the Marshall mix design method to …

Miand Design Of Recycled Aggregate Concrete

journals related to optimization of recycled aggregate concrete miand ture. aggregate size for concrete mix hotelswagat.co. Concrete aggregates The requirements of AS 2758 1 aggregate skeleton of the concrete mix design The appropriate test method depends on the size of the . gradation of aggregate for m20 concrete miand journals related to

Mixture Optimization of Green Reactive Powder Concrete ...

It is promising to use recycled powder in reactive powder concrete (RPC) to develop a green high-performance mixture with reduced cost. Based on previous study, different mixtures were designed and a comprehensive experimental program was developed to investigate the optimization of green reactive powder concrete (GRPC) mixture proportions ...

quantity of sand m concrete miand

What is cement, sand, aggregate ratios in concrete mixing ... Cement, Sand and Coarse aggregate ratios depend upon the grade of concrete. The grade of concrete is denoted by M20, M30, M40 etc. where M stands for mix and the suffix number denotes the Characteric Mean Strength of concrete ... journals related to optimization of recycled aggregate

Recycled Aggregates - Portland Cement Association

The natural process of carbonation occurs in all concrete from the surface inward. In the process of crushing concrete to create recycled concrete aggregates, areas of the concrete that have not carbonated are exposed to atmospheric carbon dioxide. The LEED ® Green Building Rating System recognizes recycled concrete in its point system. Credit ...

Structural Behavior of Concrete Beams Containing Recycled ...

The structural behavior of concrete beams containing recycled coarse aggregates (RCAs) was investigated in this study using detailed experimental data. Twelve concrete beams were tested in the experimental program: nine beams with varying RCA contents and three control beams with natural coarse aggregates (NCAs). The parameters for investigating the structural behavior of the RCA concrete ...

Experimental Study of the Geopolymeric Recycled Aggregate ...

Sep 09, 2016· Aiming to solve the problems caused by the construction and demolition waste and the depletion of natural aggregates, in the present study, both the coarse recycled aggregates and the fine recycled aggregates are used to produce new green concrete with a fly ash–based geopolymer.

Optimization of Steam-Curing Regime for Recycled Aggregate ...

For instance, the mix ID M-R-70-2 refers to the concrete mix incorporating HESC as the primary binder, and the recycled aggregate blend (both for coarse and fine aggregates), with the maximum temperature of the steam-curing cycle set at 70 °C, maintained for two hours.

Effects of Recycled Aggregate on Concrete Mix and Exposure ...

Jun 25, 2019· The unit weight of the concrete ranged from 2365 to 2175 kg/m 3, depending on aggregate content (Figure 6).Increasing the recycled aggregate content reduces the unit weight and density of the concrete, resulting in lighter concrete (Figure 6).The unit weights of the 15%, 20%, and 25% mixes were reduced by 8%, 11%, and 11.5%, respectively, compared to plain concrete.

Mix Design and Properties of Recycled Aggregate Concretes ...

This work is devoted to the study of fresh and hardened properties of concrete containing recycled gravel. Four formulations were studied, the concrete of reference and three concretes containing recycled gravel with 30, 65 and 100 % replacement ratios. All materials were formulated on the basis of S4 class of flowability and a target C35 class of compressive strength according to the standard ...

journal grading aggregate ideal for concrete

journals related to optimization of recycled aggregate concrete miand ture aggregate size for concrete mix hotelswagatco Concrete aggregates The requirements of AS 2758 1 aggregate skeleton of the concrete mix design The appropriate test method depends on the size of the gradation of aggregate for m20 concrete miand journals related to ...

Utilization of Recycled Concrete Aggregates in Stone ...

Recycled concrete aggregate (RCA) is considered as one of the largest wastes in the entire world which is produced by demolishing concrete structures such as buildings, bridges, and dams. It is the intention of scientists and researchers, as well as people in authority, to explore waste material recycling for environmental and economic advantages.

A Statistical Approach to Optimizing Concrete Mixture Design

From Table 6, the concrete mixture having a maximum compressive strength of 42.1 MPa at a minimum cementitious materials content of 350 kg/m 3, water/cementitious materials ratio of 0.38, and fine/total aggregate ratio of 0.45 can be typically selected as the optimum mixture.However, in cases where the compressive strength requirement is less than the maximum, a set of water/cementitious ...

New Mixture Proportioning Method for Concrete Made with ...

Oct 10, 2009· New method of mixture proportioning is proposed for concrete made with coarse recycled concrete aggregates (RCA). The proposed method, dubbed the "equivalent mortar volume" method, is predicated on the fact that RCA is a two-phase material comprising mortar and natural aggregate; therefore, when proportioning a concrete mixture involving RCA, one must account for …

Optimization on proportion for recycled aggregate in ...

Oct 01, 2007· All the mix proportions of recycled aggregate concrete mixed using TSMA and NMA were collected with a slump of 75 mm as required by BD .The results of density, compressive strengths, flexural strength and static modulus of elasticity to mixing with different proportions of RA using NMA and TSMA are shown in Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10, Fig ...

Concrete Mix Design for Completely Recycled Fine Aggregate ...

The undesirable properties of conventional recycled fine aggregate (RFA) often limit its application in the construction industry. To overcome this challenge, a method for preparing completely recycled fine aggregate (CRFA), which crushes all concrete waste only into fine aggregate, was proposed. The obtained CRFA had high apparent density, and its water absorption was lower than that of the ...

Mix design for recycled aggregate pervious concrete based ...

The case of optimization model is given here in order to find the aggregate gradation and suitable dosage combination of admixtures in mix design of recycled aggregate pervious concrete. For example, in practical application, typical mixture volumetric proportion of pervious concrete is: Porosity of 15–35%, volume of paste 10–30% and volume ...

Mixture Optimization of Green Reactive Powder Concrete ...

May 05, 2019· It is promising to use recycled powder in reactive powder concrete (RPC) to develop a green high-performance mixture with reduced cost. Based on previous study, different mixtures were designed and a comprehensive experimental program was developed to investigate the optimization of green reactive powder concrete (GRPC) mixture proportions ...

Optimization of normal and high strength recycled ...

Nov 01, 2017· 1. Introduction. Concrete is the most used building materials in the world but, nowadays, the construction sector has been pushed to improve its sustainability and various eco-friendly solutions are being investigated for greening the concrete industry, .In the recent years, several studies highlighted that the replacement of natural aggregates with recycled ones (leading to the so called ...

Mixture Proportion Design Method of Steel Fiber Reinforced ...

1. Introduction. Recycled coarse aggregate (RCA) presents a sustainable solution to the depletion of natural coarse aggregate (NCA) resources, and plays a key role in reducing the need for landfilling the waste disposal [1,2,3,4].Because RCA is mainly composed of two different materials, NCA and the attached cement mortar [5,6], it has much higher water absorption and lower apparent density [7,8].

Mixture optimization of cement treated demolition waste ...

Jun 15, 2011· Two different recycled aggregates, which were collected at two Dutch companies, were used in this study. One is recycled crushed concrete aggregates (RCA) and the other is recycled crushed masonry aggregates (RMA). Both recycled aggregates were divided into six fractions: 31.5–22.4, 22.4–16.0, 16.0–8.0, 8.0–5.6, 5.6–2.0, <2.0 mm.

Recycled Concrete Aggregates: A Review | SpringerLink

Mar 29, 2013· After demolition of old roads and buildings, the removed concrete is often considered worthless and disposed of as demolition waste. By collecting the used concrete and breaking it up, recycled concrete aggregate (RCA) is created (Fig. 1).This paper focuses on coarse RCA which is the coarse aggregate from the original concrete that is created after the mortar is separated from the …

journals related to optimization of recycled aggregate ...

Aug 26, 2014· At fresh state, the mix design of concrete with recycled aggregates requires an additional quantity of water to obtain a similar workability as a concrete formulated with natural aggregates (Hansen and Boegh 1986). Such a modification may obviously affect the mechanical characteristics of recycled aggregates concrete.

Strength and Durability Evaluation of Recycled Aggregate ...

May 14, 2015· Mix proportioning for recycled aggregate concrete the same volumetric ratios of the control mix was adopted for the recycled aggregate, however, since different grades of the recycled aggregate with different particle sizes were available, the following approach was considered in the current study: (i) in case of mixes contain grades 1 and 2 ...

The Utilization of Recycled Masonry Aggregate and Recycled ...

2.1. Recycled Aggregate. This research used one type of NA, two types of RMA, and one type of recycled EPS. Both types of RMA originated from construction and demolition waste and were delivered in fractions of 0–8 and 8–16 mm by a Czech recycling center (see Figure 1).For utilization as a substitute for fine-grained aggregate, in mixtures with an aggregate of fraction 0–16 mm in various ...

A hybrid intelligent system for designing optimal ...

The replacement of natural coarse aggregate (NCA) with recycled coarse aggregate (RCA) in concrete mixtures offers various advantages, including conservation of natural resources, reduction of CO 2 emissions, and cost reduction. However, multiple related variables and objectives (e.g., mechanical, economic, and environmental objectives) need to be considered when optimizing mixtures of ...

Effect of cement and admixture on the utilization of ...

Sep 15, 2017· In reality, a large number of experiments are required as to decide a suitable mixture for obtaining the desired requirements for concrete made with recycled concrete coarse/fine aggregate. Some authors as Lin et al. [7] used Taguchi's approach to reduce the numbers of experiment.