Recycled Aggregate - an overview | ScienceDirect …
However, fine recycled aggregates have specific characteristics that must be conveniently attended to in order that they do not affect detrimentally the rheology of the fresh mixtures and the physical and mechanical properties of the concretes and mortars in their hardened stage.
PDF Durability of recycled aggregate concrete …
recycled aggregates workability. However when the recycled aggregate permeability is equal to or less than 24 25 that of the new mortar the carbonation rate will be similar to that of the conventional 26 27 concrete as the carbon dioxide penetrates mainly through the new mortar. Chat Online
WORKABILITY STUDY FOR RECYCLED AGGREGATES
the use of recycled aggregates in concrete production. This is mainly because of the depletion of quality primary aggregates and in some quarters, greater awareness of environmental protection. A laboratory experimental programme aimed at examining the performance of recycled aggregates…
Effects of Recycled Aggregate on Concrete Mix …
Variations of slump and unit weight of fresh concrete with respect to aggregate concentration are presented in Figure 4.The fresh concrete’s workability, defined as the ease with which concrete can be mixed, transported, and placed, is affected by the interactions of recycled and natural aggregates.
A STUDY ON RECYCLED CONCRETE AGGREGATES
RCA. The recycled aggregate concrete is made by mixing 60% of recycled aggregates with 40% of crushed stone chips. The aggregates used for concrete batching are maintained at saturated surface dry condition . The workability of the recycled aggregate concrete is slightly lower than that of the conventional concrete. The
Mechanical and durability properties of concrete …
Faced with aggressive environments, the durability of recycled aggregate concretes constitutes one of the most unknown aspects. The employment opportunities of recycled concrete aggregates will inevitably remain cautious due to the absence of well-established performance criteria.
Strength and Durability Evaluation of Recycled …
14.05.2015 · This stone 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.
Mechanical Properties Of Recycled Aggregates …
Recycled concrete aggregates produced from all but the poorest quality original concrete can be expected to pass the same tests. 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 similar virgin aggregates. Higher porosity of RCA leads to a higher absorption.
Recycled Concrete Aggregates: A Review | …
29.03.2013 · 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 stone focuses on coarse RCA which is the coarse aggregate from the original concrete that is created after the mortar is separated from the rock …
Superplasticizer’s efficiency on the mechanical …
Coarse recycled aggregates incorporation was more detrimental than fine recycled aggregates incorporation and superplasticizer efficiency was dependent on coarse aggregate properties: the reduced stiffness of the Valnor recycled aggregates meant that the relative increases in the stiffness of the mortar paste had a noticeable effect on the ...
(PDF) USE OF RECYCLED CONCRETE …
The investigation herein focuses on studying the possibility of using recycled concrete aggregates in structural concrete. The study aims in investigating the uniaxial compressive, tensile and ...
Crushed Concrete Aggregates - Properties and …
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.
Tarmac | Recycled Aggregates
Working with our partners across the supply chain we help our customers meet their individual and legislative sustainability commitments. Our recycled aggregates are becoming increasingly important in the delivery of materials that contribute to improved circular economy performance.
Suitability Investigation of Recycled Concrete …
Physical and mechanical characteristics of recycled concrete aggregate (RCA) acquired from concrete waste are thoroughly examined. Though the RCA exhibited relatively lesser performance compared with the natural coarse aggregate (NCA), it reveals the same properties as of normal-weight aggregates in several instances. The performance of ...
PROPERTIES OF RECYCLED AGGREGATE CONCRETE
aggregates obtained from natural resources. In addi-tion, their differences primarily depend on the quantity and quality of cement mortar, which is attached to the grains of recycled aggregate (Figure 2), then, on the quality of the original concrete from which the aggregate is made by recycling and also on recycling methods. Nonetheless, in cases where the recycled aggregate comes from many ...
Properties of high-workability concrete with …
ABSTRACT. This study presents the effects of recycled concrete aggregate (RCA) on the key fresh and hardened properties of concrete. RCA was used to produce high-workability concrete substituting 0-100% natural coarse aggregate (NCA) by weight.
(PDF) Influence of Pre-Saturation of Recycled …
This stone presents an experimental study to evaluate the influence of the water addition and pre-saturation of recycled aggregates (RA) on rheological and mechanicals properties of concrete.
Experimental Study of Compressive Strength of Recycled ...
recycled as aggregate and used in concrete. It has been shown that crushed concrete rubble, after separation from other C&D waste and sieved, can be used as a substitute for natural coarse aggregates in concrete or as a sub-base layer in pavements. This type of recycled material is called recycled aggregate. Research & Development activities ...
Influence of Pre-Saturation of Recycled …
This stone presents an experimental study to evaluate the influence of the water addition and pre-saturation of recycled aggregates (RA) on rheological and mechanicals properties of concrete. Quantities of water absorbed and their variations in times were measured according to the European standard (EN 1097-6). Two methods were tested: pre-saturate the aggregates and add them to other ...