Application of Expanded Clay Aggregate ECA in Reinforced Cement Concrete
Expanded Clay Aggregate (ECA) Reinforced Concrete Tile For Animal Production Facility:
The use of Expanded Clay Aggregate (ECA) in light concrete with proper mixing order can be used for modeling of roof tiles with perfect geometry, according to the technical and comfort demands of animal.
A research was conducted by constructing poultry houses at a scale of 1 ratio 12 and the buildings were erected east-west.
The buildings were made with three (3) different roofing materials, namely:
- Roofing tiles of Expanded Clay Aggregate (ECA) concrete
- Roofing tiles of fiber-cement
- Ceramic roofing tiles
Several parameters were evaluated which includes: Relative Humidity (RH), Black Globe Temperature (BGT), Dry Bulb Temperature (DBT), Black Globe Temperature-Humidity (BGTH) and Thermal Radiation (TH).
At the end of the research, it was found that the result of all the parameters were different across all the tiles used. It was found out that the building with roofing tiles made from ECA showed the best performance.
Cement Requirement for Reinforced Concrete
The cement requirement for specific strength of concrete depends on type of lightweight aggregate used.
In fact, the amount of cement required for specific strength of concrete depends on the modulus of deformation and strength of aggregate used and also on the amount of free water and required workability.
With increasing amount of cement, the strength of reinforced concrete increases.
To ensure an excellent durability, suitable workability, protection of reinforcement from rusting and adequate bond strength between concrete and reinforcement, it is advisable to use more than 300 Kg cement per one cubic meter of concrete.
Increasing amount of cement in the mixture results to increase: shrinkage, creep, danger of cracking of concrete, and heat of hydration of cement, therefore, less than 500 Kg of cement per one cubic meter of concrete must be used.
Water Requirement for Reinforced Concrete
The amount of water in lightweight concrete includes: effective or free water between aggregates and water in pores of aggregates.
Effective water, which is the major part of water in the mixture, is in the cement paste, and this is the amount of water that determines the strength and workability.
Amount of free water depends on the maximum size of aggregate, amount of slump for required workability, shape and texture of aggregate and with less percent on the amount of cement used in the mixture.
Expanded Clay Aggregate (ECA) which is produced in rotary kiln, because of their round and smooth surface, their water absorption is much less than that of light weight aggregates with angular and rough surface.
Amount of the slump of concrete mixture depends on: the type of structural component and the facilities and method for compacting the concrete mixture.