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Dec 28, 2020 · This paper attempts to study the effect of different strengthening methods on recycled coarse aggregate (RCA) reprocessed from construction and demolition (CD) waste. And it aims to obtain the optimal RCA content in cement stabilized recycled mixture (CSRM) applied in the base layer of pavement. Firstly, three strengthening methods were used to strengthen the RCA.

Tavakoli M., Soroushian P. studied that concrete made with 100% of recycled coarse aggregate with lower w/c ratio than the conventional concrete can have larger compression strength. When the w/c ratio is the same the compression strength of concrete made with 100% of recycled aggregate is lower than that on conventional concrete.

Jul 07, 2015 · Properties of the concrete using the aggregate were shown to have the same quality with that made by natural aggregates such as gravel and crushed stone. INTRODUCTION. OUTLINE OF PRODUCTION TECHNOLOGY. TEST ON OPERATING CONDITIONS OF PRODUCING EQUIPMENT. QUALITY OF ORGINAL AND RECYCLED COARSE AGGREGATE

Jan 29, 2020 · This study presents a liberation process for recycling highquality coarse aggregates from waste concrete by impacting with steel grits. Considering the mortar liberation ratio and specific energy for the liberation process as well as the water absorption and apparent density of the recycled coarse aggregates (RCA), the effects of impact velocity, impact time, and concrete strength on the ...

Xiao et al. found that the creep mechanism is strongly affected by the use of coarse recycled aggregates, mainly due to the old mortar adhered to the original aggregates, which generates a weaker ITZ and higher concrete deformability. This leads to a change in stress distribution of mortar and aggregates over time during the creep process, both ...

In this study recycled coarse aggregates obtained by crushed concrete were used for concrete production. Four different recycled aggregate concretes were produced; made with .

Jun 30, 2018 · In this context, recycled concrete (RC) has been recognised as a means to preserve natural resources and reduce space for waste storage. During the last decades, many researchers have developed works studying different recycled concrete properties. This review focuses on structural RC made with coarse recycled aggregate from concrete waste.

Scope. This practice covers selected aspects for reclamation of recycled aggregate base (RAB) material derived from asphalt pavement or concrete. RAB may be called recycled asphalt pavement (RAP) or recycled concrete aggregate (RCA). This practice is provided related to material quality, material quality control testing, and also ...

Compared with natural aggregate, the content of hardening cement in recycled aggregate is larger, which leads that the water absorption of recycled aggregate is larger and its performance such as robustness is poorer. And the engineering field pays much attention to the problem of the recycled fine aggregate which can be used in the durability requirements of recycled concrete or not.

Numerous research studies have been conducted to improve the weak properties of recycled aggregate as a construction material over the last few decades. In twostage concrete (TSC), coarse aggregates are placed in formwork, and then grout is injected with high pressure to fill up the voids between the coarse aggregates. In this experimental research, TSC was made with 100% recycled coarse ...

The recycled coarse aggregate will invariably have lower specific gravity and higher absorption than the original aggregate, due to the presence of cement paste in the recycled aggregate. The compressive strengths of recycled aggregate concrete are lower than those of the same mix designs made with aggregate.

Another approach of recycling aggregates involves a popular construction material product referred to as ABC, Aggregate Base Coarse. Through the process of crushing used concrete and asphalt obtained from demolition sites and then brought back to the gravel pit where it is crushed down, this regenerated ABC material can be used as a base in the process of building roads.

Recycled aggregate comes primarily from PCC and AC from road rehabilitation and maintenance, demolition, and leftover batches of AC and PCC. After processing, the rocks retain bits of cement or asphalt. A roadway is built in several layers: pavement, base, and sometimes subbase.

Large amounts of construction waste are being produced from China's urbanization process [].Waste concrete is the most suitable raw material for renewable building materials among construction waste [].In recent years, the use of recycled coarse aggregates (RCA) has attracted particular attention because it can not only save natural aggregates but effectively reduce the environmental ...

Sep 01, 2021 · alezTaboada, F. MartínezAbella, R. VascoSilva, Recycled concrete with coarse recycled aggregate. An overview and analysis, Materiales de Construction 68 (330) (2018) .

Behavior of recycled aggregate concretefilled basalt and carbon FRP tubes.

The invention relates to building material and in particular to a recycled concrete coarse aggregate modified processing method; water reducing agents with weight of percent of cement is added in cement and is uniformly mixed, and then the recycled coarse aggregate is added under the coition that the cement paste is stirred uniformly and is uniformly mixed with the cement paste and is ...

Aggregates can be either natural, manufactured, or recycled. Aggregates are obtained from natural sand, gravel, pits, hardrock quarries, lakes, or seabed. Aggregators are classified as Coarse Aggregates and Fine Aggregators (usually less than ). Aggregates Process. Aggregates are processed to segregated coarse and fine aggregates ...

Coarse Aggregate. 60% of recycled coarse aggregate of demolished structures of 20mm passing and retained on 10mm sieve were used and natural crashed aggregate were subdivided into another 40% of passing 20 mm and retained on 10 mm sieve and 60 % passing 10mm .

Jun 01, 2018 · Having verified that the recycled ceramic aggregates met all the technical requirements imposed by current Spanish legislation, established in the Code on Structural Concrete (EHE08), then it is prepared a control concrete mix and the recycled concrete mix using 100% recycled ceramic aggregate instead of coarse natural aggregate.

IRJET Experimental Study on Green Concrete Made With Recycled Aggregates. IRJET, 2021. IRJET Journal. Download PDF. Download Full PDF Package. This paper. A short summary of this paper. 37 Full PDFs related to this paper. Read Paper.

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 rock .

Cement and Concrete Research 37 (2007) 735 742. Influence of amount of recycled coarse aggregates and production process on properties of recycled aggregate concrete M. Etxeberria, E. Vzquez, A. Mar, M. Barra Universitat Politcnica de Catalunya (UPC), Department of Construction Engineering, Faculty of Civil Engineering, 08034 Barcelona, Spain Received 22 December 2005; accepted 7 February 2007