Shrinkage-reducing compound additive capable of effectively reducing CA (cement and asphalt) mortar bleeding, and CA mortar dry material and CA mortar containing same
A compound additive and mortar technology, applied in the field of building materials, can solve the problems of increasing the thixotropy of CA mortar, hardening CA mortar without obvious effect, reducing bleeding, etc.
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Embodiment 1
[0021] Preparation of CaO clinker: mix limestone and composite mineralizer according to the mass ratio of 92:8, grind it into raw material, calcinate at 1100°C for 70min, then quench in air, grind, pass through 80μm sieve. The composite mineralizer obtained is a mixture of 40% copper slag and chromium slag with equal mass. CaO clinker specific area is 350m 2 / kg~380m 2 / kg; which is composed of 60% industrial gypsum.
[0022] Preparation of MgO by calcining at low temperature: after calcining magnesite at 800°C for 60 minutes, quenching in air, grinding, and sieving through an 80 μm sieve, the content of MgO is 88%, and the loss on ignition is 3%. The hydration activity value is 60-70s, and the specific surface area is 260m 2 / kg~280m 2 / kg.
[0023] Weigh the CaO clinker and the low-temperature calcined MgO in proportion, and mix them uniformly to obtain the composite additive.
Embodiment 2
[0025] Preparation of CaO clinker: mix limestone and composite mineralizer according to the mass ratio of 90:10, grind it into raw material, calcinate it at 1300°C for 45 minutes, then quench it in air, grind it, and pass it through an 80 μm sieve. The specific surface area of CaO clinker obtained is 180m 2 / kg~220m 2 / kg; the composite mineralizer is composed of 30% copper slag and 70% industrial gypsum.
[0026] Preparation of MgO by calcining at low temperature: after calcining magnesite at 850°C for 40 minutes, quenching in air, grinding, and sieving through an 80 μm sieve, the content of MgO is 86%, and the loss on ignition is 3.5%. The hydration activity value is 80-90s, and the specific surface area is 350m 2 / kg~370m 2 / kg.
[0027] Weigh the CaO clinker and the low-temperature calcined MgO in proportion, and mix them uniformly to obtain the composite additive.
Embodiment 3
[0029] Preparation of CaO clinker: mix limestone and composite mineralizer at a mass ratio of 95:5, grind it into raw material, calcinate it at 1200°C for 90 minutes, then quench it in air, grind it, and pass it through an 80 μm sieve. The specific surface area of CaO clinker obtained is 270m 2 / kg~300m 2 / kg; wherein the composite mineralizer is composed of a mixture of 50% chromium slag and 50% industrial gypsum.
[0030] Preparation of MgO by calcining at low temperature: after calcination of magnesite at 720°C for 80 minutes, quenching in air, grinding, and sieving through an 80 μm sieve, the content of MgO is 85%, and the loss on ignition is 5%. The hydration activity value is 45-55s, and the specific surface area is 160m 2 / kg~200m 2 / kg.
[0031] Weigh the CaO clinker and the low-temperature calcined MgO in proportion, and mix them uniformly to obtain the composite additive.
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