High strength special steel tube concrete
A special steel pipe and concrete technology, applied in the field of building materials, can solve the problems of decreased concrete workability, uncontrollable expansion, unstable long-term expansion performance of concrete, etc., and achieve the effect of improving bearing capacity
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Embodiment 1
[0021] High-strength special steel pipe concrete, raw materials include cement, admixtures, fine aggregate, coarse aggregate, admixture A, admixture B, water; the selection of raw materials is as follows:
[0022] 1. Cement Choose P·Ⅱ52.5R cement, the compressive strength of 3 days is 37.5Mp, and the compressive strength of 28 days is 59.3Mp.
[0023] 2. Admixture Slag fine powder, specific surface area 415m2 / kg, activity index 83% after 28 days, belonging to S75 grade.
[0024] 3. Fine aggregate Haicheng river sand, with a fineness modulus of 3.0, is located in Zone II, with a mud content of 2%.
[0025] 4. Coarse aggregate Liaoyang limestone, particle size 5-20mm, crushing index 8.2%, needle flake content 4.5%, mud content 0.5%.
[0026] 5. Admixture A SY-K expansion fiber anti-cracking agent, the limited expansion rate in water is 0.035% for 3 days, 0.042% for 28 days, and the limited expansion rate in air is 0.011% for 28 days.
[0027] 6. Admixture B Single-ring aromati...
Embodiment 2
[0035] High-strength special steel pipe concrete, raw materials include cement, admixtures, fine aggregate, coarse aggregate, admixture A, admixture B, water; the selection of raw materials is as follows:
[0036] 1. Cement Choose P·Ⅱ52.5R cement, the compressive strength of 3 days is 37.5Mp, and the compressive strength of 28 days is 59.3Mp.
[0037] 2. Admixture Slag fine powder, specific surface area 415m2 / kg, activity index 83% after 28 days, belonging to S75 grade.
[0038] 3. Fine aggregate Haicheng river sand, with a fineness modulus of 3.0, is located in Zone II, with a mud content of 2%.
[0039] 4. Coarse aggregate Liaoyang limestone, particle size 5-20mm, crushing index 8.2%, needle flake content 4.5%, mud content 0.5%.
[0040] 5. Admixture A SY-K expansion fiber anti-cracking agent, the limited expansion rate in water is 0.035% for 3 days, 0.042% for 28 days, and the limited expansion rate in air is 0.011% for 28 days.
[0041] 6. Admixture B Single-ring aromati...
Embodiment 3
[0049] High-strength special steel pipe concrete, raw materials include cement, admixtures, fine aggregate, coarse aggregate, admixture A, admixture B, water; the selection of raw materials is as follows:
[0050] 1. Cement Choose P·Ⅱ52.5R cement, the compressive strength of 3 days is 37.5Mp, and the compressive strength of 28 days is 59.3Mp.
[0051] 2. Admixture Slag fine powder, specific surface area 415m2 / kg, activity index 83% after 28 days, belonging to S75 grade.
[0052] 3. Fine aggregate Haicheng river sand, with a fineness modulus of 3.0, is located in Zone II, with a mud content of 2%.
[0053] 4. Coarse aggregate Liaoyang limestone, particle size 5-20mm, crushing index 8.2%, needle flake content 4.5%, mud content 0.5%.
[0054] 5. Admixture A SY-K expansion fiber anti-cracking agent, the limited expansion rate in water is 0.035% for 3 days, 0.042% for 28 days, and the limited expansion rate in air is 0.011% for 28 days.
[0055] 6. Admixture B Single-ring aromatic ...
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