Shrinkage-reducing anti-cracking pavement cement concrete and preparing method thereof
A technology of cement concrete and cement, which is applied in the field of concrete, can solve the problems of broken or pulled out fibers, weak bonding between fibers and cement paste, and reduction of concrete fatigue tensile strength, so as to reduce drying shrinkage and deformation and creep deformation, improving fatigue resistance and tensile strength, and tight structure
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[0024] Example one
[0025] The reduced-shrinkage and crack-resistant pavement cement concrete of the present invention is prepared from water, cement, fly ash, basalt fiber, lightweight aggregate, crushed stone, sand and water reducing agent. Among them, water, cement, fly ash, and basalt The mass ratio of fiber, lightweight aggregate, crushed stone, sand and water reducing agent is 180:405:45:2.65:286:465:846:4.3.
[0026] The cement is P·O 42.5 ordinary Portland cement.
[0027] Fly ash is grade II fly ash, the fineness of fly ash is 14%, the loss on ignition of fly ash is 3.4%, the water requirement ratio of fly ash is 98%, and the 28d activity index of fly ash is 82%.
[0028] The basalt fiber is chopped basalt fiber, the diameter of the basalt fiber is 13μm, the length is 20mm, the tensile strength is 4100-4800MPa, the elastic modulus is 93-110GPa, the elongation at break is 3.0-3.2%, and the retention rate of single filament breaking strength Is 75%.
[0029] The light aggrega...
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[0055] Example two
[0056] The reduced-shrinkage and crack-resistant pavement cement concrete of the present invention is prepared from water, cement, fly ash, basalt fiber, lightweight aggregate, crushed stone, sand and water reducing agent. Among them, water, cement, fly ash, and basalt The mass ratio of fiber, lightweight aggregate, crushed stone, sand and water reducing agent is 180:410:40:5.3:229:559:830:4.5.
[0057] The cement is P·O 42.5 ordinary Portland cement.
[0058] Fly ash is grade II fly ash, the fineness of fly ash is 14%, the loss on ignition of fly ash is 3.4%, the water requirement ratio of fly ash is 98%, and the 28d activity index of fly ash is 82%.
[0059] The basalt fiber is chopped basalt fiber, the diameter of the basalt fiber is 13μm, the length is 20mm, the tensile strength is 4100-4800MPa, the elastic modulus is 93-110GPa, the elongation at break is 3.0-3.2%, and the retention rate of single filament breaking strength Is 75%.
[0060] The light aggregat...
Example Embodiment
[0066] Example three
[0067] The reduced-shrinkage and crack-resistant pavement cement concrete of the present invention is prepared from water, cement, fly ash, basalt fiber, lightweight aggregate, crushed stone, sand and water reducing agent. Among them, water, cement, fly ash, and basalt The mass ratio of fiber, lightweight aggregate, crushed stone, sand and water reducing agent is 200:400:50:2.65:286:465:850:4.1.
[0068] The cement is P·O 42.5 ordinary Portland cement.
[0069] Fly ash is grade II fly ash, the fineness of fly ash is 14%, the loss on ignition of fly ash is 3.4%, the water requirement ratio of fly ash is 98%, and the 28d activity index of fly ash is 82%.
[0070] The basalt fiber is chopped basalt fiber, the diameter of the basalt fiber is 13μm, the length is 20mm, the tensile strength is 4100-4800MPa, the elastic modulus is 93-110GPa, the elongation at break is 3.0-3.2%, and the retention rate of single filament breaking strength Is 75%.
[0071] The light aggre...
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