JPH0258428B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of curing concrete surfaces.

During the hardening process, the temperature of poured concrete increases due to the heat of hydration, and if there is a large temperature difference between it and the concrete surface, temperature stress will occur, causing cracks on the concrete surface.

Conventionally, as a method to prevent this cracking, a curing mat or a curing sheet was placed on the concrete surface after concrete was poured, but it was difficult to properly control the temperature of the concrete surface.

The present invention was made in view of the above problems, and
The purpose is to always provide the appropriate temperature to the concrete surface with a moderate heat dissipation area.
The object of the present invention is to provide a method for early control of cracks on concrete surfaces.

In the present invention, when concrete is poured into a base mat-like concrete structure, a concave groove is formed in the upper surface of the base mat-like concrete structure in a maze-like manner and forms a closed circuit, and the concrete is cured in this groove. It is characterized by continuously or intermittently circulating a curing medium such as water, steam, or air that is suitable for the temperature through a temperature and pressure control device, and examples thereof will be described in detail below with reference to the drawings. do.

FIG. 1 shows an embodiment of the concrete surface curing method according to the present invention.

Reference numeral 1 denotes a base mat-like concrete structure after pouring, and 2 denotes a groove formed on the concrete surface by setting a formwork (not shown) provided with a convex portion, for example, during concrete pouring.

The grooves 2 are formed in a labyrinth shape with appropriate intervals between adjacent grooves, and are formed in a closed circuit via the temperature and pressure feeding device 3. Further, the size of the groove 2 is determined depending on the area and thickness of the concrete. In addition, a wooden frame or a box made of steel or the like can be installed in the groove 2, if necessary, with a removable lid.

A curing medium such as water, steam, or air suitable for the curing temperature of the concrete is supplied into the groove 2 thus formed.

First, a curing medium such as water, steam, air, etc. supplied from the outside (not shown) to the temperature and pressure control device 3 according to the required amount is adjusted by the device 3 to a temperature suitable for curing concrete. and is pumped into the groove 2.

The curing medium pumped into the groove 2 is continuously or intermittently cyclically pumped while being controlled to a predetermined curing temperature and a predetermined pumping amount by a temperature and pumping control device 3.

As described in detail above, according to the present invention, a concave groove running in a labyrinth shape and forming a closed circuit is formed on the upper surface of a base mat-like concrete structure, and a temperature suitable for concrete curing is maintained in the groove. Since the adjusted curing medium is pumped and circulated, a properly controlled temperature is applied to the concrete surface with grooves, so it is possible to reduce the temperature stress caused by the heat of hydration in the concrete at an early stage. As a result, cracks can be controlled and high quality concrete structures can be obtained.

Furthermore, since covering the groove does not prevent damage to the next operation, secondary effects such as long-term temperature control can be obtained.

Furthermore, since the top surface of the base mat-like concrete structure is uneven, the strength of the joint with the concrete poured onto the top surface side is improved.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the curing method according to the present invention, in which A is a plan view and B is a cross-sectional view taken along the line XX of A. 1...Concrete structure, 2...Gutter, 3...
Temperature and pumping control equipment.

Claims (1)

[Claims] 1. At the time of concrete pouring of the base mat-like concrete structure, a concave groove is formed on the upper surface of the base mat-like concrete structure, running in a labyrinth shape and forming a closed circuit. A method of curing concrete surfaces characterized by continuous or intermittent circulation of a suitable curing medium such as water, steam or air through temperature and pressure control devices.