High-strength special concrete-filled steel tube
A special steel pipe and concrete technology, applied in the field of building materials, can solve the problems of decreased concrete workability, lack of guidance for the selection of concrete expansion materials, 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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