Waterproof Concrete CPAC
Details The answer for structures that must be exposed to moisture. CPAC has researched and developed to have true waterproof properties without having to add waterproofing agents at the work site. And has high water resistance. It has been designed to be in accordance with the standard materials and construction requirements for concrete structures (Engineering Institute of Thailand). Therefore, it is very suitable for structures that are exposed to water or moisture all the time, such as swimming pools, water tanks, bathroom floors, foundations*, and ground beams.
*In the case of foundations that are thicker than 50 cm., consider using CPAC low-heat concrete (according to ACI 207.1R-05 standards).
Suitable for types of work:
Concrete structures that are intended to store water or must be directly exposed to water or moisture, such as swimming pools, water tanks, bathroom floors, including structures that must be exposed to underground water, such as foundations, ground beams, basements, or tunnels.
Properties:
Water resistance, good resistance to water penetration, prevents moisture from reacting with reinforcing steel, causing rust and damaging the strength of the structure.
Usage instructions and precautions:
Proper preparation before pouring concrete, such as structural joints, installing Water Stop devices, reinforcing steel placement positions, reinforcing steel covering distances, and applying formwork sealant. In the case of pouring the structure of the roof, you should choose to use CPAC roof concrete, which is designed to be suitable for specific use. It has properties that prevent water and cracking of concrete due to strong winds and high temperatures from sunlight during the period when the concrete has not yet hardened (Plastic Shrinkage Crack).
Pouring concrete correctly Pouring concrete to prevent the concrete from separating. Tools to be used for pouring or transporting concrete that are appropriate for the conditions of the unit or structure, such as rails, cranes, pumps, and determination of the concrete drop distance (Free Fall) for pouring tall structures to prevent concrete from separating or according to the standard requirements for materials and construction for concrete structures (Engineering Institute of Thailand)
Compacting concrete into the formwork using a vibrator and the correct method for vibrating, such as the distance between the vibrator head, the depth of the vibrator head, the orientation of the vibrator head, or according to the standard requirements for materials and construction for concrete structures (Engineering Institute of Thailand)
Concrete curing Concrete should be cured immediately after the concrete begins to set continuously for at least 7 days, which can be done in several ways, such as water retention, concrete curing chemicals, covering with wet sacks and watering to keep it moist at all times, or spraying with clean water to keep it moist at all times, or according to the standard requirements for materials and construction for concrete structures. (Engineering Institute of Thailand)
Structures and buildings or special constructions that may require other appropriate curing methods in addition to this method
Prevention of concrete cracking from drying shrinkage (Drying Shrinkage Crack) In general, concrete after hardening will shrink due to the evaporation of water in the concrete, causing the adhesion in the structure and subsequent cracking. Therefore, structures that are poured in very long lines, such as walls, partitions, floor slabs, should also consider cracking due to concrete shrinkage. The design to control cracking should be designed by a specialist engineer.