Rapid hardening Portland Cement
This gives higher early strengths and is there fore suitable for prestressed concrete and pre-cast concrete works. The so called super fine cement is also classified as rapid hardening cement. Another variation known as extra rapid hardening cement contains calcium chloride. This extra rapid hardening cement is not produced in India, but if it is made available in works abroad, particular note should be taken regarding the possible presence of calcium chloride in extra rapid hardening cement. Most specification prohibit the use of calcium chloride in prestressed works and now there is a trend towards avoiding calcium chloride even in ordinary works, if the concrete contains reinforcements or embedded metal fixtures and fasteners, because of the corrosion risk.
Rapid hardening Portland cements confirms to IS 8041
This gives higher early strengths and is there fore suitable for prestressed concrete and pre-cast concrete works. The so called super fine cement is also classified as rapid hardening cement. Another variation known as extra rapid hardening cement contains calcium chloride. This extra rapid hardening cement is not produced in India, but if it is made available in works abroad, particular note should be taken regarding the possible presence of calcium chloride in extra rapid hardening cement. Most specification prohibit the use of calcium chloride in prestressed works and now there is a trend towards avoiding calcium chloride even in ordinary works, if the concrete contains reinforcements or embedded metal fixtures and fasteners, because of the corrosion risk.
Rapid hardening Portland cements confirms to IS 8041
