In our ready mixed concrete production facilities, high strength concrete ranges from C12/14 to C50/55 that are in compliance with TSI are manufactured.
In addition to such products, in order to satisfy the customer requirements of various stiffness and aggregate dane classes, flowable controlled low strength concrete, high performance concrete, high early strength concrete, tunnel formwork concrete, high storey building concrete and concrete types that are in compliance with the Environmental Impact Analyses are also manufactured and the customer's needs are thus are satisfied.
Our products have been certified with TSI Quality Certificate. Our company conducts all kinds of inspections and controls regarding the raw material and our products at every phase of the production.
Our facilities have been awarded with G Type Certificate of Compliance. The facilities are periodically inspected by TSI.
Defines the weather condition in which the temperature exceeds 30C for three days in row as "extremely hot weather".
Defines the ready mixed concrete pouring temperature as +5 to +30 degrees in normal weather conditions.
TS EN 206-1
The freshly mixed concrete temperature may be defined at the time of delivery between the User and the Manufacturer. (by providing tolerance limits).
The effects of the hot weather on the freshly mixed concrete
The water content to the mixture increases
The loss of slump value occurs in higher rate
The heat of the concrete (Hydration) increases. The concrete sets more rapidly.
The cracks of the plastic contraction increases.
The air content of the air dragged concrete is hardly manageable.
The Effects of the Hot weather on the hardened concrete
The strength increases fast within the first days but their 28 day strength winds up quite low.
Since more water is added, a porous concrete with high water permeability is obtained.
Since there will be temperature differences after the concrete cools down, the tendency to crack increases.
More contractions are likely to happen.
The measures that should be taken
Using cements with relatively lower hydration temperatures
Cooling down the materials that form the concrete
Taking measures that would prevent the loss of water by evaporation
Preventing the direct contact of the sunlight with the concrete
Cooling down the mold and the fittings before the pouring phase
Wrapping the columns with wet sacks
Being not late for curing
Decreasing the effects of the wind
Using chemical additives that would delay the settlement.
Initiating the curing process as soon as possible
Pouring concrete under normal weather conditions
The point where the concrete shall be poured should also be the point that it shall set. Any method that involves pouring the concrete to an area and carrying it to another area where it will set by simply tugging it along should be avoided. The concrete may be dispersed to an area up to 3 meters from where it is poured. Especially in concrete flooring and road concrete applications, the concrete is usually piled up to a certain area then it is attempted to be spread. This practice should be avoided.
The concrete should be poured in vertical layers. The thickness of each layer should be 15 - 30 cm. the layer thickness should be homogenous and should be same in every area of the concrete. In elements such as columns and shear walls; the thickness should be 30 - 45 cm. For more massive concrete applications such as dams, this thickness may even be higher. The concrete should always be poured to the middle of the molds. The concrete that hits the walls of the mold separate and dissolve. Lower the hose of the pump as low as possible to the base of the mold. This would prevent the separation of the concrete. The freshly mixed concrete is not let free fall from higher distances. Pour the freshly mixed concrete from a height of maximum 80 cm.
The concrete should always be poured in vertical direction relative to the mold. The setting of the concrete is initiated from the corners of the mold. A drizzling rain is suitable for pouring concrete. However, please avoid pouring concrete under heavy rain. The pouring of the concrete should be continuous without any interruption. Cold joint puring should be allowed.
Pouring Concrete under Cold Weather Conditions
Defines the weather condition, in which the average weather temperature drops below +5C for three days in row as "the cold weather".
The effects of the cold weather conditions of the concrete
Under cold weather conditions, the set up time of the freshly mixed concrete happens to be longer than the set up times under normal temperature conditions while its speed of gaining strength is slower. Freezing of the water content within the concrete in the initial stages (within the period, in which the concrete is not set or has not regained sufficient strength) even once would greatly reduce the strength and durability of the concrete. When a high level of difference between the temperature between the poured concrete and the ambient temperature would create tension on the concrete and this would lead to the cracks on the surface.
The effect of the freeze ups that occur within the initial stages
The freezing of the water inside the concrete that has not been set. As the result of the freezing of the water inside the set and hardened but not yet sufficiently strengthened concrete the internal cracks and crevasses are formed and thus a permeable and porous concrete with lower strength is obtained.
At -5C, %92 of the water of the concrete mix freezes.
It is considered that the concrete does not regain any strength under -12C
The frozen water expands to a ratio of %9 of its volume.
The relevant Turkish standard acknowledges that the concrete cannot be damaged by the frost after reaching to a pressure strength of 50 kg/cm2.