JPH03193647A - Lightweight aerated concrete formed body and its production - Google Patents

Abstract

PURPOSE:To improve the water absorption and water retentivity by dispersing a highly water-absorptive polymer in an aerated concrete material, placing the material into a framework, closing the opening with an arresting plate, fixing the plate to the framework and aging the material at high temp. CONSTITUTION:A highly water-absorptive polymer is added by 0.5-2 pts.wt. to a concrete material consisting of 100 pts.wt. of cement, 40-80 pts.wt. of water, 50-200 pts.wt. of aggregate, 5-30 pts.wt. of silica, etc., and mixed and kneaded by a mixer 1. An aq. frother soln. is then supplied to the mixer 1 from a tank 2 and air through a compressor 5 and a cylinder 8 to obtain an aerated cement material 11. The material 11 with the sp.gr. adjusted to 0.5-1.8 is placed into a formwork 13 from a hopper 12, and a placed reinforcing bar 14 is arranged. The framework 13 closed with the arresting plate 15 is put in a curing space 18 enclosed by a sheet 17, high-temp. steam is supplied from its source 19 to age the material, then the plate 15 is separated from the framework 13, and a lightweight aerated concrete formed body is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a lightweight cellular concrete molded body having excellent water absorption and heat insulation properties, and a manufacturing method thereof by high temperature curing.

[Prior Art] Lightweight aerated concrete moldings are already known as wall materials for buildings, etc., but they are still not sufficient to eliminate the condensation phenomenon that is a common problem with concrete wall materials, and the moldings themselves cannot be expected to have a humidity regulating effect.

In addition, when manufacturing lightweight cellular concrete moldings,
Due to the problem of expansion due to the generation of air bubbles, it is necessary to set the pre-W1 time considerably long before heating and curing.
Furthermore, since high temperature curing is not possible, the curing time is inevitably long, making it difficult to shorten the operating cycle of a manufacturing plant.

[The invention seeks to solve a! IIl] Therefore, an object of the present invention is to provide a lightweight cellular concrete molded body having high water absorption and water retention.

A further object of the present invention is to provide a method for producing light hard cellular concrete moldings, which can be cured at high temperatures with a short preparatory time, thereby increasing the productivity of a production plant.

[Means for Achieving the Object] The lightweight cellular concrete molded body of the present invention will be described below using the reference numerals in the attached drawings. The lightweight cellular concrete molded body of the present invention is molded using a cellular concrete material 11 in which highly water-absorbent polymer is dispersed. be.

In addition, the gist of the method for manufacturing a lightweight cellular concrete molded body of the present invention is that after pouring the cellular concrete material 11 into the formwork 13, the opening 13a of the formwork 13 is closed with a restraint plate 15, and the restraint plate 15 is It is to cure at high temperature while being fixed to the frame 13.

[Example] In the illustrated example, the aerated concrete material 11 includes 100 parts by weight of cement, 40 to 80 parts by weight of water, 50 to 200 parts of fine aggregate (sea sand), and 5 to 3 parts of silica hume (pozzolanic material). A raw material composed of .01 part and super absorbent polymer (Aqua Cube) 055 to 2 part is kneaded in a mixer 1, and air bubbles are mixed therein.

A foaming agent aqueous solution with a concentration of 1% to 10% is passed from tank 2 through pump 3 and flow meter 4, and is directly transferred to a length of 50 cm with PI 5 C.
At the same time, air is sent from the compressor 5 to the foaming cylinder 8 via the regulator 6 and pressure gauge 7, and in the process of passing the air and the foaming agent aqueous solution through nine layers of glass beads in the foaming cylinder 8. ,
The required air bubbles are generated and sequentially fed to the mixer l.

The aerated concrete material 11 having a specific gravity of 0.5 to 1.8 thus prepared is filled into a moving hopper 12,
It is poured from the hopper 12 into a steel formwork 13. The formwork has the required reinforcing bar assemblies 14 in place.

Formwork 13 used for pouring aerated concrete material 11
The opening 13a is completely closed by a steel restraining plate 15. The restraint plate 15 is installed at a predetermined position l on the formwork surface by a conveyance means 16 such as a crane, and is secured to the mold by its own weight or by suitable fixing means such as bolts, keys, fasteners, etc. It is fixedly held so as not to separate from the frame 13.

The formwork 13 closed with the restraining plates 15 is carried into the curing space 18 surrounded by the sheet 17, and the curing space 1ffl l
8 D is supplied with high-temperature steam at 80° C. to 10° C. from the steam supply source 19. This steam curing is done for 3 hours.

Preliminary time is open lower with restraint Jii15 after pouring?
This is a short period of time that can be used for all the work required to close the mold 113a and transport the formwork 13 into the curing space 18. In particular, even if the first 23 hours are set, a long time is not required as in the conventional manufacturing method.

The above-mentioned high-temperature steam curing promotes the hydration reaction of silica hume and cement, and a high-strength, light-weight cellular concrete molded body is manufactured at an early stage.

After the steam curing is completed, the restraining plate 15 is separated from the mold #13, and the molded body becomes a mold! She is removed from 3.

Note that the composition of the cellular concrete material, the method of dispersing and mixing air bubbles, the shape and structure of the five frames and restraint plates, the method of curing the molded body, etc. are not particularly limited to those described above, and may be changed as appropriate.

[Effects of the invention] As described above, the lightweight cellular concrete molded body of the present invention has the following effects:
Because it is made by dispersing and mixing superabsorbent polymer into aerated concrete material, it has high water absorption and water retention properties, and when used as a wall material for buildings, it absorbs water from the surrounding area through its cellular structure. Super absorbent polymers that come into contact with the air absorb moisture from the air, eliminating condensation and reducing changes in indoor humidity.It also has a high insulation effect at low temperatures, making it suitable for use in extremely low temperatures. It is highly useful as a heat insulating material for superconducting systems.

In the manufacturing method of the present invention, after pouring the aerated concrete material into the formwork, the opening of the formwork is closed with a restraining plate and the restraining plate is fixed to the formwork. The internal expansion is suppressed by being confined in a 1 m closed room made up of restraining plates, and as a result, the preheating time before heating curing can be shortened, and heating curing can also be performed from 80°C to 10°C.
Steam curing at high temperatures such as 0°C is possible, and the hydration of the composition is promoted, making it possible to quickly produce high-strength lightweight cellular concrete moldings, and f? Also, the dimensional stability of the mold is excellent.

Furthermore, since the preparatory time and curing time are short as described above, it is easy to shorten the operating cycle of the manufacturing plant, and the productivity of the manufacturing plant can be increased.

[Brief explanation of drawings]

FIG. 1 is a block diagram schematically illustrating an embodiment when preparing aerated concrete material in the manufacturing method of the present invention, and FIG. 2 is an embodiment when pouring the aerated concrete material into a formwork. FIG. 3 is a longitudinal sectional view schematically showing an embodiment in which the pouring opening of the formwork is closed with a restraining plate, and FIG. 4 is a longitudinal sectional view schematically showing the formwork. FIG. 3 is a vertical cross-sectional view schematically showing an embodiment when the molded body inside is cured at high temperature. l... Mixer, 2... Foaming agent aqueous solution tank, pump, 4... Flow meter, 5... Compressor regulator, 7... Pressure gauge, 8... Foaming cylinder 9... Glass beads, 10... Conveyance means, aerated concrete material, 12... Hopper formwork, 13a... Opening, 14
... Rebar assembly, ... Restriction plate, 16 ... Conveying means, 17 ... Sheet, 3 ... 6 ... Linda 11 ... 13 ... 5 8 ... Curing space , 19... Steam supply source

Claims (2)

[Claims] (1) A lightweight cellular concrete molded body characterized by being formed by dispersing and mixing a highly absorbent polymer into a cellular concrete material. (2) After pouring the aerated concrete material into a formwork, the opening of the formwork is closed with a restraining plate, and the curing is carried out at high temperature with the restraining plate fixed to the formwork. A method for manufacturing a concrete molded body.