Frost damage prevention method for cast-in-place concrete beams and slabs

Abstract

The invention discloses a frost damage prevention method for cast-in-place concrete beams and slabs. Before the concrete beams and slabs are cast, a scaffold is arranged on the ground, and formworks are arranged on the scaffold to cast the concrete beams and slabs. The frost damage prevention method includes the following steps that 1, the periphery of the scaffold is closed; 2, multiple heating devices are erected below the scaffold and used for heating the formwork located on the scaffold; 3, the concrete beams and slabs are cast on the formworks above the heating devices; 4, a sealing film, a straw mattress and an extruded sheet are sequentially laid on the upper surfaces of the concrete beams and slabs to seal cast concrete and preserve the heat of the cast concrete. According to the frost damage prevention method for the cast-in-place concrete beams and slabs, the concrete can be in a positive temperature environment in the casting and curing processes to effectively ensure the early-stage strength of the concrete.

Description

technical field [0001] The invention relates to a method for preventing freezing damage of cast-in-place concrete beam slabs. Background technique [0002] According to the provisions of JGJ104-2011 of "Construction Regulations for Construction Engineering in Winter", the critical strength of concrete poured in winter shall meet the following requirements: for ordinary concrete constructed by heat storage method and greenhouse method heating method, Portland cement, When preparing ordinary Portland cement, it should not be less than 30% of the design concrete strength grade; It should be less than 40% of the designed concrete strength grade value; when the minimum outdoor temperature is not lower than -15°C, the critical freezing strength of concrete constructed using the comprehensive heat storage method and negative temperature curing method should not be less than 4.0 MPa; when the minimum outdoor temperature When the temperature is not lower than -30°C, the freezing c...

AI Technical Summary

Problems solved by technology

In this method, the construction area of ​​the greenhouse needs to be very large, resulting in defects such as complex structure, waste of materials, increased labor and erection time, high cost, and difficult maintenance in the later period. Add boilers, carbon and water to heat the inner space of the greenhouse, but the greenhouse is relatively closed, and workers are prone to poisoning when working in it

[0004] Compared with the greenhouse method, the storage method has a simple structure, and only needs to install a boiler at the lower end of the scaffolding steel pipe for heating, but it has poor heat preservation after heating

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