Limestone machine-made sand dry-mixed mortar and preparation method thereof
A technology for dry-mixed mortar and machine-made sand, applied in the field of building materials, can solve the problems of high mud content, high proportion of coarse particles and fine powder, poor particle gradation, etc. Effect
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Embodiment 1
[0025] (1) Weigh the raw materials according to the following parts by weight: cement 90kg, fly ash 80kg, machine-made sand 830kg, mortar water-retaining plasticizer 0.8kg, water 135kg;
[0026] (2) Pour the weighed dry raw materials into the blender and dry mix for 180s;
[0027] (3) According to the consistency at the construction site, add mixing water and stir evenly.
[0028] Among them, the cement strength grade is P O42.5, the fly ash is grade II, the limestone machine-made sand particle size is 1.18-3.5mm is the first grade, and the particle size is below 1.18mm is the first grade, and the mixing weight ratio of the two is 0.8:1 ,
[0029] The resulting mortar mixture has a consistency of 78mm, a 2h consistency loss rate of 19.8%, a water retention rate of 93.6%, and an apparent density of 1860 kg / m 3 , The 7-day strength is 4.3MPa, and the 28-day strength is 6.5MPa. The basic performance of the mortar meets the requirements of the national standard "Ready-mixed Mor...
Embodiment 2
[0031] (1) Weigh the raw materials according to the following parts by weight: cement 105kg, fly ash 80kg, machine-made sand 815kg, mortar water-retaining plasticizer 0.8kg, water 135kg;
[0032] (2) Pour the weighed dry raw materials into the blender and dry mix for 180s;
[0033] (3) According to the consistency at the construction site, add mixing water and stir evenly.
[0034] Among them, the cement strength grade is P O42.5, the fly ash is grade II, the limestone machine-made sand particle size is 1.18-3.5mm is the first grade, and the particle size is below 1.18mm is the first grade, and the mixing weight ratio of the two is 0.8:1 ,
[0035] The resulting mortar mixture has a consistency of 76 mm, a 2-hour consistency loss rate of 20.2%, a water retention rate of 94.9%, and an apparent density of 1860 kg / m 3 , The 7-day strength is 5.5MPa, and the 28-day strength is 8.6MPa. The basic performance of the mortar meets the requirements of the national standard "Ready-mix...
Embodiment 3
[0037] (1) Weigh the raw materials according to the following parts by weight: cement 120kg, fly ash 75kg, machine-made sand 805kg, mortar water-retaining plasticizer 0.8kg, water 138kg;
[0038] (2) Pour the weighed dry raw materials into the blender and dry mix for 180s;
[0039] (3) According to the consistency at the construction site, add mixing water and stir evenly.
[0040] Among them, the cement strength grade is P O42.5, the fly ash is grade II, the limestone machine-made sand particle size is 1.18-3.5mm is the first grade, and the particle size is below 1.18mm is the first grade, and the mixing weight ratio of the two is 0.8:1 ,
[0041] The resulting mortar mixture has a consistency of 77mm, a 2h consistency loss rate of 19.2%, a water retention rate of 94.5%, and an apparent density of 1880 kg / m 3 , The 7-day strength is 7.4MPa, and the 28-day strength is 13.2MPa. The basic performance of the mortar meets the requirements of the national standard "Ready-mixed M...
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