JPH11278885A - Cement based roof tile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a cement based roof tile having excellent quick setting property, low shrinking property and dimensional stability for a short time by incorporating a fired material containing C11 A7 .CaCl2 , C2 S and/or C3 S and gypsum. SOLUTION: The fired material containing 10-40 wt.% C11 A7 .CaCl2 and C2 S and/or C3 S is obtained by firing one or more kinds of raw materials selected form municipal refuse incineration ash and sewage sludge incineration ash at 1200-1500 deg.C. The cement based roof tile is obtained by blending 1-30 pts.wt. gypsum, 0.1-3.0 pts.wt. inorganic or organic retarder, sand, water and if necessary an inorganic pigment, a chemical admixture and the like with 100 pts.wt. fired material, kneading and forming. As a result, the application of the eco-cement, which has various limitations such as inapplicability to the mortar.concrete containing reinforcement, is extended while making use of the excellent properties of the eco-cement and the effective use and the recycling of waste materials are accelerated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cement tile using cement (hereinafter referred to as "ecocement") produced mainly from waste such as incinerated ash from municipal waste and ash from sewage sludge.

[0002]

2. Description of the Related Art With the improvement of human living standards, in particular,
The amount of garbage generated in urban areas has increased rapidly, and garbage disposal has become an important social problem. Some of the garbage disposal methods are incinerated and reduced in volume, and then the garbage incineration ash generated is melted and solidified, and used for aggregates such as concrete blocks or roadbed materials. It is far from mass use, and most of the incineration ash is currently landfilled.

[0003] Under such circumstances, ecocement manufactured by using waste such as incinerated ash of municipal waste and ash of sewage sludge as a main raw material has been proposed, and is expected as a technology for effectively utilizing incinerated ash as resources. While this cement has excellent properties of quick-setting and low shrinkage, it usually contains chlorine in an amount of 0.1% by weight or more, so that it easily corrodes rebar and cannot be applied to mortar / concrete products containing rebar. There is a problem.

[0004]

Therefore, the present invention provides
Providing cement-based roof tiles that can expand the applications of eco-cement with various restrictions such as being inapplicable to mortar and concrete products including the above-mentioned rebar, while taking advantage of the excellent properties of eco-cement, and effectively utilizing waste And to promote recycling.

[0005]

In order to achieve the above object, according to the cement tile of the present invention, at least:
Using cement produced from one or more of municipal waste incineration ash and sewage sludge incineration ash as a raw material (claim 1);
Cement is a calcined product using at least one of municipal garbage incineration ash and sewage sludge incineration ash, and C ₁₁ A ₇ .CaCl ₂
It is composed from the fired product and gypsum contain one or more of 10 to 40 wt% and C ₂ S, C ₃ S (claim 2), characterized by. Hereinafter, the present invention will be described in detail.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Cement-type roof tiles are usually kneaded by adding a predetermined amount of cement, sand, water, and, if necessary, fibers, admixtures, etc., and then kneaded. It is manufactured through a process such as curing. The coloring may be performed by kneading the inorganic pigment at the time of kneading the raw materials. The first feature of the present invention in such a cement-based tile is to use ecocement manufactured using at least one of municipal waste incineration ash and sewage sludge incineration ash as raw materials. Eco-cement has quick-setting properties and low shrinkage, as described later, and it is extremely efficient to manufacture cement tiles with excellent dimensional stability by shortening the curing time and increasing the rotational efficiency of the formwork. Can be.

[0007] The above-mentioned ecocement is produced by using at least one of municipal garbage incineration ash and sewage sludge incineration ash as a main raw material. Industrial waste, as well as ordinary cement raw materials such as limestone, clay, silica, aluminum ash,
Raw materials whose components have been adjusted by appropriately mixing them with bauxite, iron or the like can be used.
C. and calcined, and then added with gypsum and pulverized, or obtained by adding gypsum after pulverization. The calcined product is C ₁₁ A ₇ .C
aCl ₂ (11CaO · 7Al ₂ O ₃ · CaCl ₂ )
40 wt% and _{C 2 S (2CaO · SiO 2} ), C 3
A cement containing one or more of S (3CaO.SiO ₂ ) is preferable, and a cement excellent in quick-setting property and low shrinkage can be obtained.

Since the aluminum source in the fired material is mainly derived from incinerated ash, if the content of the C ₁₁ A ₇ .CaCl ₂ compound is less than 10% by weight, the amount of incinerated ash used is reduced, and the effective use of waste It is not preferable from the viewpoint of recycling. On the other hand, if it exceeds 40% by weight, it may expand excessively due to the progress of hydration.

Next, gypsum can be used in any of anhydrous gypsum, gypsum dihydrate and hemihydrate gypsum.
It is preferable to add 1 to 30 parts by weight based on 100 parts by weight of the fired product.

[0010] In the cement-based roof tile of the present invention, the ecocement can be used in its entirety, but various types of Portland cement, such as ordinary, fast, ultrafast, moderate heat, sulfate resistant, white, etc., and blast furnace , Silica, fly ash, etc., and various fillers such as fly ash, blast furnace slag, limestone fine powder, silica fume and the like can also be added. That is, Ecocement is a C ₁₁ A ₇ · CaCl ₂ compound a strong material quick-setting containing 10 to 40 wt%,
By mixing Portland cement or the like, rapid hardening can be adjusted and the production of cement tile can be facilitated.

In addition, by using an inorganic or organic retarder to adjust the setting of eco-cement, the pot life in cement-based roof tile production can be adjusted. As the inorganic retarder, phosphoric acid and salts thereof, for example, phosphoric acid, phosphates, boric acid, borates and the like can be used, and organic retarders are carboxylic acids, oxycarboxylic acids and salts thereof, Sugars, such as citric acid, malic acid,
Sucrose, oligosaccharides, dextrins and the like can be suitably used.

A preferable pot life can be obtained by adding 0.1 to 3.0% by weight of the setting modifier to the ecocement. When the ecocement is used at 60% by weight or less, it is not always necessary to add the setting modifier.

Next, the cement-based roof tile of the present invention is similar to a normal cement-based roof tile using the above-mentioned eco-cement and setting modifier, sand, water, and, if necessary, an inorganic pigment and a chemical admixture. As described above, Ecocement is excellent in quick setting and low shrinkage, increases the rotational efficiency of the formwork, and can efficiently produce cement-based tiles with good dimensional stability. it can. Hereinafter, examples of the present invention will be described.

[0014]

EXAMPLES The following materials were used to prepare cement-based roof tiles. Ecocement 100 parts by weight Sand 200 parts by weight Water 55 parts by weight Citric acid 0.5 part by weight

The used eco-cement was mixed with 43.3% by weight of municipal waste incineration ash, 54.5% by weight of limestone powder, 1.3% by weight of aluminum ash and 0.9% by weight of clay.
5% by weight of gypsum was added to pulverized clinker obtained by firing at about 1300 ° C. using a rotary kiln.
Blaine specific surface area is 4300 cm ² / g. The mineral composition of the calcined product was as follows: C ₁₁ A ₇ .CaCl ₂ : 24.1% by weight, C ₃ S: 68.1% by weight, C ₂ S: 4.5% by weight, and ferrite phase 3.3% by weight. %.

After the above materials are kneaded, they are packed in a mold, and 70 kg
Press dehydration molding at a pressure of / cm ² . Then 50 ° C
After curing with heat and humidity for 3 hours, remove from the mold, and cure at room temperature for 7 days, 305 mm in width x 305 mm in length and 11 in thickness.
mm was obtained. The flexural breaking load of this cement tile is 1350N, which is equivalent to that using ordinary cement. However, by shortening the demolding time, the rotational efficiency of the form is increased and the cement tile is manufactured extremely efficiently. I was able to.

[0017]

As described above, according to the present invention, the excellent quick-setting property and low shrinkage property of Ecocement are utilized,
A cement tile with good dimensional stability that can be manufactured with a shorter curing time (demolding time), and through the use of this eco-cement, the effective use and recycling of waste can be promoted. It is.

Claims (2)

[Claims] 1. A cement tile comprising at least cement produced from at least one of municipal waste incineration ash and sewage sludge incineration ash. 2. A calcined product in which the cement is made from at least one of municipal waste incineration ash and sewage sludge incineration ash, and C ₁₁
The A ₇ · CaCl ₂ 10~40 wt% and C ₂ S, C ₃ S
The cement-based roof tile according to claim 1, comprising a gypsum and a calcined product containing at least one of the following.