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 reducing bleeding, increasing the thixotropy of CA mortar, increasing the risk of bleeding of CA mortar, etc., so as to improve frost resistance, improve bleeding and homogeneity Effect
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Embodiment 1
[0021] Preparation of CaO clinker: limestone and composite mineralizer are mixed according to the mass ratio of 92:8 and ground into raw material, calcined at 1100 ° C for 70 minutes, then quenched in air, ground, and passed through an 80 μm sieve. The obtained CaO clinker has a specific surface area of 350m 2 / kg~380m 2 / kg; the composite mineralizer is composed of 40% mixture of equal mass copper slag and chromium slag and 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 at 1300°C for 45min, then quench in air, grind, pass through 80μm sieve, and make it into raw material. The obtained CaO clinker has a specific surface area of 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 according to the 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 80μm sieve. The specific surface area of the obtained CaO clinker is 270m 2 / kg~300m 2 / kg; 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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