Swelling material for cement or concrete and preparation thereof
An expansion agent and concrete technology, applied in the field of preparation of the expansion agent, can solve the problems of large limited expansion ratio, high compressive and flexural strength, etc., and achieve the effects of saving energy, saving land and reducing production costs
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Embodiment 1
[0022] Weigh 82g of magnesium slag (CaO+MgO content is 59%), 10g of dihydrate gypsum, 5g of secondary fly ash, 3g of sodium sulfate, mix and grind (specific surface area 300~600m 2 / kg) made into cement concrete expansion agent, tested according to the national standard, when the dosage is 10% of the cement mass, the limit expansion rate of curing in water for 7 days is 0.19%, the limit expansion rate of curing in water for 28 days is 0.07%, and curing in air The 21-day limit expansion rate is 0.074%, the 7-day compressive strength is 33.7MPa, the 28-day compressive strength is 48.5MPa, the 7-day flexural strength is 8.3MPa, and the 28-day flexural strength is 9.2MPa, in line with "Concrete Expansive Agent" JC476-2001 standard requirement.
Embodiment 2
[0024] Weigh 90g of magnesium slag (CaO+MgO content is 65%), 10g of dihydrate gypsum, mix and grind (specific surface area 300~600m 2 / kg) made into cement concrete expansion agent, tested according to the national standard, when the dosage is 12% of the cement mass, the limit expansion rate of curing in water for 7 days is 0.11%, the limit expansion rate of curing in water for 28 days is 0.06%, and the limit expansion rate of curing in air is 0.06%. The 21-day limit expansion rate is 0.015%, the 7-day compressive strength is 33.6MPa, the 28-day compressive strength is 45.4MPa, the 7-day flexural strength is 7.8MPa, and the 28-day flexural strength is 8.1MPa, in line with "Concrete Expansive Agent" JC476-2001 standard requirement.
Embodiment 3
[0026] Weigh 75g of magnesium slag (CaO+MgO content is 57%), 15g of dihydrate gypsum, 7g of secondary fly ash, 3g of sodium sulfate, mix and grind (specific surface area 300~600m 2 / kg) made into cement concrete expansion agent, tested according to the national standard, when the dosage is 10% of the cement mass, the limit expansion rate is 0.09% for 7 days in water curing, 0.01% for 28 days in water curing, and 0.01% for curing in air. The 21-day limit expansion rate is 0.004%, the 7-day compressive strength is 31.2MPa, the 28-day compressive strength is 45.7MPa, the 7-day flexural strength is 6.7MPa, and the 28-day flexural strength is 7.6MPa, in line with "Concrete Expansive Agent" JC476-2001 standard requirement.
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