recycled aggregate workability

Recycled Aggregate Workability

Crushed Concrete Aggregates - Properties and Uses of ...

Water absorption of recycled aggregate influence both fresh and hardened concrete properties. Recycled sand will be avoided, due to its absorption capacity, which would no doubt produce a shrinkage effect. Workability of recycled aggregate concretes is affected by the absorption capacity of the recycled aggregates.

Recycled Aggregate - an overview | ScienceDirect Topics

As a consequence of these characteristics of the recycled aggregates, their increasing content in a mixture leads to a decrease of its workability. As the recycled aggregates present have a higher water absorption capacity, a higher content of fine materials, and a rougher surface (larger surface area), the water content of the mixture needs to be modified in order to obtain matrices with the same consistencies of those determined when using natural aggregates …

WORKABILITY STUDY FOR RECYCLED AGGREGATES

All types of recycled aggregates were tested for all types of aggregate tests as per Indian standards and compared to find out effect of type of parent concrete. 1) Cement Testing. An OPC 53 grade conforming to IS 12269 – 1987 [6] was used throughout the study for preparation of mix A and mix B concrete production.

Recycled Aggregate Concrete: Applications, Advantages ...

Creates more employment opportunities is recycling industry. Disadvantages of Recycled Aggregate: Downgrading of quality of concrete. Increase in water absorption capacity ranging from 3% to 9%; Decrease in compressive strength of concrete (10-30%) Reduces workability of concrete. Lack of specifications and guidelines.

Experimental Study of Compressive Strength of Recycled ...

The basic engineering properties of Recycled Concrete Aggregate (RCA) is evaluated and it is compared with the Normal Aggregate (NA). Similarly, the basic concrete properties like, compressive strength, workability etc. are studied for the different combinations of RCA with NA.

Strength and Durability Evaluation of Recycled Aggregate ...

May 14, 2015 · Recycled aggregate (RA) is a viable alternative to natural aggregate, which helps in the preservation of the environment. One of the critical parameters that affect the use of recycled aggregate is variability of the aggregate properties.

EFFECT OF RECYCLED COARSE AGGREGATE ON WORKABILITY …

Concrete (FRHSC) which use recycled aggregates that have originated from demolished construction wastes.The workability of FRHSC was measured in terms of compaction factor and V-B time in fresh state of concrete.

Use of Recycled Aggregate Concrete - IOSR Journals

aggregate as well as for the recycled aggregate. The use of recycled aggregate generally increases the drying shrinkage creep & porosity to water & decreases the compression strength of concrete compared to that of natural aggregate concrete. It is nearly 10-30% as per replacement of aggregate.

Recycled Aggregate Concrete - SlideShare

Nov 15, 2014 · Its a lower density, elastic modulus, strength and a higher water absorption capacity. recycled aggregate has a proportional mortar which attached to aggregate, it gives a higher porosity and a lower strength to RAC than the normal concrete. In addition, since recycled aggregates require a more amount of water than natural aggregate, shrinkage issue …

Recycled Concrete as Aggregate for Structural Concrete ...

aggregate. Because of the attached mortar, recycled aggregate has significantly higher water absorption than natural aggregate. Therefore, to obtain the desired workability of RAC it is necessary to add a certain amount of water to saturate …

Transportation Applications of Recycled Concrete Aggregate

workability. Recycled fines, when used, are generally limited to about 30 percent of the fine-aggregate portion of the mixture. (1)

Aggregates Supplier & Delivery | Concrete Recycling | ReAgg

ReAgg is a leading aggregates supplier, committed to providing quality crushed stone products and delivery services in Baltimore, Fairfax, Alexandria, Rockville, Washington DC …

The Use of Recycled Concrete Aggregates (RCA) for ...

Because recycled aggregate contains mortar from the original concrete, it is more porous and absorptive than many natural aggregates. Recycled aggregate had water absorption of 9.6%. The workability of concrete, as the amount of recycled aggregate was increased, the concrete required more water to maintain adequate consistency. This was attributed to the angular shape and …

Recycling of Concrete (Recycling Coarse Aggregate)

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 ...

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 …

(PDF) EFFECT OF FINE AGGREGATES ON WORKABILITY OF …

[Show full abstract] sand) by recycled aggregate or dune sands and finding the effect of clay content on workability of concrete. Effect of presence of mica in fine aggregates is also briefly ...

PROPERTIES OF RECYCLED AGGREGATE CONCRETE

amount of recycled aggregate in structural concrete should range from 20% to 30%, in order to ensure that the maximum water absorption of aggregate used is less than 5%.

Enhancing mechanical and durability properties of recycled ...

Jan 15, 2018 · The modulus of elasticity of the recycled aggregate concretes was reduced when the recycled aggregates percentage increased except for the case of RT100 in which it increased by 9% . “RT” mixtures exhibited on the average 22% higher modulus of …

Design of Normal Strength Concrete Mixtures with Recycled ...

use recycled concrete aggregates as replacement for virgin natural aggregates. Three mix design methods utilizing direct weight replacement, equivalent mortar replacement, and direct volume replacement are compared based on concrete workability, compressive strength, and elastic modulus. A total of 42 mixes were

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