Curing-free PHC pipe pile concrete

Abstract

The invention discloses a curing-free PHC pipe pile concrete. Production raw materials of every cubic meter of the concrete comprise 300-450kg of portland cement, 25-110kg of granulated blast-furnace slag powder, 10-100kg of fly ash microspheres, 10-100kg of silica fume, 20-60kg of an expanding agent, 640-725kg of fine aggregates with the fineness modulus of 2.4-3.0, 1120-1200kg of coarse aggregates with the granular composition of 5-25mm, 0.1-0.5kg of triethanolamine, 2-6kg of lithium sulfate, 7-13kg of anhydrous gypsum, 4-7kg of a water reducer, and 125-140kg of water. The concrete is used for producing PHC pipe piles, and can reach the demolding strength requirement of the curing-free PHC pipe piles and the strength requirement of C80 concrete at normal temperature in a short time.

Description

technical field [0001] The invention relates to the technical field of concrete materials, in particular to steam-cured PHC pipe pile concrete. Background technique [0002] At present, the concrete preparation of PHC pipe piles needs to use atmospheric pressure steam curing or high pressure steam curing technology to improve the early strength of concrete, ensure PHC demoulding as soon as possible and improve production efficiency. In the production process of PHC pipe piles, the steam and autoclave curing process not only takes a certain amount of time and consumes a lot of energy, but also both atmospheric pressure steam curing and high pressure steam curing will have an adverse effect on the performance of concrete. Under the condition of steam curing, the internal pores of concrete will increase, which will reduce the resistance of concrete to chloride ion penetration; the use of incorrect steam curing system will also have an adverse effect on the later compressive str...

AI Technical Summary

Problems solved by technology

In the production process of PHC pipe piles, the steam and autoclave curing process not only takes a certain amount of time and consumes a lot of energy, but also both atmospheric pressure steam curing and high pressure steam curing will adversely affect the performance of concrete

Under steam curing conditions, the internal pores of concrete will increase, reducing the resistance of concrete to chloride ion penetration; using an incorrect steam curing system will also have an adverse effect on the later compressive strength of concrete, and the short curing time will cause steam curing Horizontal cracks in the concrete surface

Autoclave curing requires autoclaving for 3 to 5 hours under the conditions of steam pressure 0.95-1.0MPa and temperature 170-180°C. Autoclaving will affect the performance of concrete, especially the temperature when the autoclave is out of the autoclave. Very high, if not treated effectively, the temperature difference can cause cracks in the PHC pipe pile concrete, which will have an adverse effect on the durability of the PHC pipe pile concrete

If steam curing or high-pressure steam curing is not used, the existing PHC pipe pile concrete preparation method cannot meet the production needs

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