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recycled aggregates workability. Influence of Mineral Admixture and Recycled Aggregate … In this paper,the recycled aggregate is made of waste concrete. The influences on workability of recycled ... More Info workability of recycled concrete aggregate.
The effect of replacement of natural granite aggregate with recycled coarse aggregate on shear strength and workability of FRHSC has been evaluated at length in this paper. Keywords : Cement, Natural fine aggregate, Natural coarse aggregate, Recycled aggregate, Water, super plasticizer
mortar. Fine recycled-concrete aggregate (FRCA) was used in this study in mixtures to replace natural aggregate at different degrees. Fine aggregates, both natural and recycled aggregates, were used to prepared SCC mortar in two moisture conditions, wet condition and dry condition. The change of workability and rheology of SCC mortar over time was
Porosity and absorption also decreased in concrete where up to 50% of recycled aggregate was replaced by induction furnace slag. Considering these, it is concluded that 50% of recycled aggregate can be replaced by induction furnace slag that will result in superior mechanical and durability properties in recycled aggregate concrete.
recycled aggregate workability U.S. Department of Agriculture Forest Service National Technology & Development Program 7700Transportation Mgmt 0877 1805SDTDC March 2009 F O REST VIC E D E P A RTMEN OF G IC U L T U R E Stabilization Selection Guide for Aggregate- and ...
Recycled concrete aggregate (RCA) is generally produced by two-stage crushing of demolished concrete, and screening and removal of contaminants such as reinforcement, paper, wood, plastics and gypsum. Concrete made with such recycled concrete aggregate is called recycled aggregate concrete (RAC). The main purpose of this work is to determine
use of recycled aggregates has an adverse effect on the workability of concrete. Such an effect can be easily retained by using plasticizers. Also, concrete strength has been reduced by 5% to 25% depending on the percent of the normal aggregate replaced by recycled aggregate …
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 of recycled aggregate in order to achieve the same workability and compression strength as conventional concrete.
saving in concrete, with replacement of recycled coarse aggregate. Murali, et al.  showed that the recycled coarse aggregate concrete has lesser compressive, split tensile and flexural strength than that of natural coarse aggregate. However, with the water and acid treatments, recycled coarse aggregate concrete strength may be improved.
FAMING LIU et al: EXPERIMENTAL STUDY ON THE WORKABILITY OF RECYCLED FINE AGGREGATE… DOI 10.5013/IJSSST.a.17.49.20 20.3 ISSN: 1473-804x online, 1473-8031 print It is shown from Figure 1 that the fluidity of cement mortar generally lessened to a …
WORKABILITY AND COMPRESSIVE STRENGTH PROPERTIES OF CONCRETE CONTAINING RECYCLED CONCRETE AGGREGATE. This paper describes two laboratory based experimental studies to determine some plastic and hardened properties of concrete incorporating recycled concrete aggregates.
This paper investigates the workability, compressive strength, and elastic modulus of normal-strength concrete with recycled concrete aggregate (RCA) as replacement for coarse natural aggregate (for example, crushed stone, gravel).
An experimental program was carried out to evaluate workability and rheology of 49 mixes of self-compacting concrete made replacing the natural coarse aggregate by recycled concrete coarse aggregate. Workability responses included the slump flow, L-box, J-Ring and sieve segregation tests.
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.
the workability is defined as "the composite property of fresh concrete involving ease of placing and resistance to segregation is called workability " .the proportions and properties of water,cement, aggregates, admixtures and other replaced materials affect the workability of concrete .various concreting operations,if properly done ...
workability of recycled aggregate concretes is affected by the absorption capacity of the recycled aggregates. The shape and texture of the aggregates can also affect the workability of the concrete. Concrete crushed by an impact crusher achieves a high percentage of recycled coarse aggregates without adhered mortar. Concrete made
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 possibly the water absorption of the recycled aggregate.
These aggregates which are often used in the production of concrete are named as recycled aggregates, mainly obtained from crushed concrete 2) Reasons for Use of Recycled Aggregate It is now widely accepted that there is a significant potential for reclaiming and recycling …
Our national network of recycling facilities produces recycled aggregates in accordance with the Waste and Resources Action Programme (WRAP) Quality Protocol and all our recycling facilities are permitted to accept construction, demolition, excavation and highway wastes.
Concrete, usually Portland cement concrete, is a composite material composed of fine and coarse aggregate bonded together with a fluid cement (cement paste) that hardens over time—most frequently a lime-based cement binder, such as Portland cement, but sometimes with other hydraulic cements, such as a calcium aluminate cement.
and coarse recycled aggregates to limit the negative influence of aggregates on mechanical properties of concrete. Key words: Superplasticizer, recycled aggregate, concrete, workability, viscosity, mechanical strength, grading.
work are discussed at length. Similarly the properties of recycled aggregate concrete are also determined. 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
The use of recycled concrete aggregate (RCA) is recommended based on a review of literature that investigated the properties and characteristics of RCA, the physical properties of fresh and hardened concrete containing RCA, the mechanical behavior of concrete containing RCA, and special
Design of Normal Strength Concrete Mixtures with Recycled Concrete Aggregates A.M. Knaack1 and Y.C. Kurama2 1Univ. of Notre Dame, Department of Civil Engineering and Geological Sciences, 156 Fitzpatrick Hall of Engineering, Notre Dame, IN, 46556; email: [email protected] 2Univ. of Notre Dame, Department of Civil Engineering and Geological Sciences,
Limited studies were focused on the influence of some recycled aggregate properties on slump, which is the most frequently used measure to evaluate workability.
significantly affect the workability of fresh concrete, as well as the permeability of liquids and gases in the hardened state; they also significantly depend on the properties of concrete used in recycling for pro- ... Mirjana Malešev, et al., Properties of recycled aggregate concrete
Properties of High-Workability Concrete with Recycled Concrete Aggregate Using the same W/C ratio, S/A ratio and HRWR dosage of control concrete, four different concretes were designed with RCA 30
Recycled concrete aggregate (RCA) made from demolished concrete waste can be used as replacement for natural aggregate in new concrete construction. Use of RCA has been limited to non-structural applications (e.g., roadway sub-base).