Ultra-high performance cement-based H-shaped section bar
An ultra-high-performance, cement-based technology, applied in basic structural engineering, structural elements, sheet pile walls, etc., can solve problems that have not yet appeared, poor construction convenience, and high brittleness.
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Embodiment 1
[0081] Ultra-high performance cement-based H-shaped profiles, of which:
[0082] H=400mm, B=200mm, t 1 = 30mm, t 2 =30mm, R 1 =20mm, R 2 =3mm, R 3 = 0mm;
[0083] Ultra-high-performance cement-based composite material, including cementitious material, water and water reducer, the volume of cement accounts for 20%, the cement is P·I cement with a strength grade of 52.5, and the mineral admixture is silica fume and powder Coal ash, accounting for 54%.
[0084] The ratio fraction of cement, silica fume and fly ash is numerically analyzed and calculated through the ideal accumulation curve and its particle size cumulative distribution curve;
[0085] 1) the ideal stacking curve formula is:
[0086] P sd =A+(100-A)·(d / D max ) π / 2e ;
[0087] Among them, P sd is the percentage of particles passing through the sieve, A is an empirical constant, d is the diameter of the sieve, D max is the maximum particle size of the particle;
[0088] The value of the empirical constan...
Embodiment 2
[0110] Ultra-high performance cement-based H-shaped profiles, of which:
[0111] H=400mm, B=400mm, t 1 =50mm,t 2 =50mm, R 1 =25mm, R 2 =5mm, R 3 = 5mm;
[0112] Ultra-high performance cement-based composite material, including cementitious material, water and water reducer, the volume of cement accounts for 49%, the cement is P·I cement with a strength grade of 62.5, and the mineral admixture is silica fume, powder Coal ash and slag powder account for 18% by volume; the proportions of each component of the cementitious material are calculated in Example 1 to obtain X c =0.731, X sf =0.104, X fa = 0.094 and X bs = 0.070. The water-binder ratio W / B=0.143, the admixture is polycarboxylate superplasticizer solution, and the dosage is 2.3% of the mass of the gelling material.
[0113] The volume percentage of the main materials used in ultra-high performance cement-based composites is as follows:
[0114]
[0115] The dosage and quality ratio of each material of ultra...
Embodiment 3
[0123] Ultra-high performance cement-based H-shaped profiles, of which:
[0124] H=400mm, B=200mm, t 1 = 30mm, t 2 =30mm, R 1 =20mm, R 2 =3mm, R 3 = 0mm;
[0125] Ultra-high-performance cement-based composite material, including cementitious material, fine aggregate, steel fiber, water and water reducer, the volume of cement accounts for 26.5%, the cement is P·II cement with a strength grade of 52.5, and the mineral mixed The composite materials are silica fume, fly ash and mineral powder, accounting for 15.8%. Each component distribution fraction of gelling material is by the calculation mode of embodiment 1, gets X c =0.626, X sf =0.161, X fa = 0.102 and X bs = 0.111. The fine aggregate is natural sand with a fineness modulus of 1.4, and its volume is 0.811 of that of the cementitious material. The steel fibers are copper-plated steel fibers with a diameter of 0.2mm and a length of 13mm, and the volume content is 1.5%. The water-binder ratio W / B=0.162, the admixt...
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