Steam-free self-curing concrete pipe pile and preparation method thereof

Abstract

The invention provides a steam-free self-curing concrete pipe pile and a preparation method thereof. The concrete pipe pile is prepared from the following raw materials in parts by weight: 320 to 460 parts by weight of cement, 60 to 100 parts by weight of ground granulated blast furnace slag, 20 to 25 parts by weight of anhydrous gypsum powder, 50 to 85 parts by weight of microbeads, 550 to 750 parts by weight of sand, 1150 to 1300 parts by weight of gravel, 110 to 120 parts by weight of water, 10 to 12 parts by weight of a polycarboxylic acid high-performance water reducing agent, 0.5 to 1.5 parts by weight of polyethylene glycol and 0.1 to 0.12 part by weight of polyether. According to the steam-curing-free producing technology, the early strength of the pipe pile concrete is greatly improved, the requirement for improving the strength of the pipe pile concrete in the early stage can be met by adopting natural curing, the producing link can be simplified, the cost is reduced, the energy consumption is reduced, and the durability of the concrete can be improved by adopting the steam-curing-free producing technology; and the method has very important significance on the quality, economic benefits, popularization and application of pipe pile products.

Description

【Technical field】 [0001] The invention relates to the field of building materials, in particular to a steam-free self-curing concrete pipe pile and a preparation method thereof. 【Background technique】 [0002] my country has become one of the countries in the world with the most varieties of prestressed concrete prefabricated piles, the most complete specifications and the widest range of applications. In the production or manufacturing process of precast piles represented by pretensioned prestressed high-strength concrete pipe piles, in order to speed up the mold turnover and ensure that the concrete strength meets the design strength requirements in a relatively short period of time, the secondary steam curing process is generally used. , that is, atmospheric pressure steam curing process and high pressure steam curing process. The function of the normal pressure steam curing process is to make the strength of the pipe pile concrete meet the requirement of no less than 45...

AI Technical Summary

Problems solved by technology

The secondary steam curing process consumes a lot of energy and has an adverse effect on the durability of pipe piles, and boilers and autoclaves are pressure vessels, which have certain potential safety hazards

Although some manufacturers have developed autoclave-free curing technology in recent years, which has a great effect on saving energy consumption, this technology still needs to be cured by atmospheric pressure steam once. In addition to energy consumption, steam curing is easy to bring to the product. Certain hidden dangers in quality - when the concrete curing temperature exceeds 70 ° C, it is easy to produce delayed calcium vanadium stone reaction, which will cause expansion and affect the microstructure, which is not conducive to the durability of concrete

Some manufacturers are still trying to use steam-free curing to produce prestressed concrete pipe piles, but due to technical limitations, they cannot solve the problems of low mold turnover efficiency and the circumferential cracking of pipe piles caused by concrete drying shrinkage.

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