JP2859554B2 - Method for producing porous body using cement aggregate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a porous body using a cement aggregate used for a water-permeable pavement material, a sound absorbing plate and the like.

[0002]

2. Description of the Related Art Conventional perforated plates, such as water-permeable pavement materials and sound-absorbing plates, are usually produced by kneading aggregates such as crushed stones and gravel with cement, but have sufficient internal pores. In addition, when the amount of cement serving as a binder is reduced in order to ensure water permeability and sound absorbing performance, there is a problem that strength is reduced.

[0003]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems and provides a method for producing a porous body using cement aggregate which has sufficient internal pores and has the necessary strength. It was done for.

[0004]

Means for Solving the Problems A method for producing a porous body using a cement aggregate according to the present invention, which has been made to solve the above-mentioned problems, is directed to a cement obtained by spheroidizing a kneaded product of cement and an inorganic plasticizer. It is characterized in that the aggregate is kneaded with cement, molded, and then hardened.

[0005] The cement aggregate used in the present invention is obtained by spheroidizing a kneaded product of cement and an inorganic plasticizer. Portland cement, white cement, early-strength cement, alumina cement,
Blast furnace cement or the like can be used. As the inorganic plasticizer, clay such as frog eye clay and kibushi clay can be used. The inorganic plasticizer has a role of giving the plasticity necessary for spheroidizing the cement without deteriorating the properties of the cement itself, and also acts as a filler for the cement. The amount of the inorganic plasticizer added is 50 to 95 parts by weight of the cement and 5 parts of the inorganic plasticizer.
To 50 parts by weight. This is because if the amount of the inorganic plasticizer is less than 5 parts by weight, the kneaded material is insufficient in plasticity, so that spheroidization becomes difficult, and if it exceeds 50 parts by weight, the strength is insufficient.

In addition, cement and inorganic plasticizer 100
Based on parts by weight, up to 2 parts by weight of organic binder and up to 5 parts by weight of pigment can be added. Dextrin or CMC is used as this organic binder, and the strength (hardening strength) of the cement aggregate before hardening can be increased to facilitate handling. However, since this organic binder adversely affects the properties of the cement, it is preferably used in an amount of 2 parts by weight or less. The pigment is added as needed when it is desired to color the cement aggregate, and is generally 0.5 to 5 parts by weight. The pigment may be an organic pigment or an inorganic pigment.

Each of the above-mentioned materials is kneaded with water, adjusted to a water content of 15 ± 2%, and spheroidized by a granulator or a granulator. The particle size is not particularly limited, but is preferably about 0.5 to 10 mm. The obtained cement aggregate may be forcibly cured or may be left uncured. In the case of forced curing, for example, temperature 40 ~ 50 ℃,
What is necessary is just to hold for 2 hours or more in the curing room of 90% or more of humidity, or water.

[0008] The cement aggregate thus obtained is
After kneading and molding with cement as a binder, the mixture is cured to obtain a porous body. The cement that is the binder
Portland cement, white cement, early strength cement,
Alumina cement, blast furnace cement and the like can be used. The mixing ratio of the cement aggregate to the binder cement is such that the cement aggregate is 50 to 90 parts by weight and the cement is 10 parts by weight.
Preferably, the amount is up to 50 parts by weight. Incidentally, 0.5 to 5 parts by weight of a pigment or 2 parts by weight or less of an organic dispersant may be added.

The molding is performed by a pressure molding method or a pressure vibration molding method. Curing of the molded body is performed, for example, by keeping the molded body in a curing room or water at a temperature of 40 to 50 ° C. and a humidity of 90% or more for 2 hours or more. Or temperature 15 ~ 30 ℃, humidity 80 ~ 10
The condition may be 0%. As a result, the cement component in the cement aggregate and the cement as the binder are firmly bound by the hydration reaction, and a porous body having excellent strength and uniform internal pores can be obtained.

[0010]

According to the present invention, a cement aggregate obtained by spheroidizing a kneaded product of cement and an inorganic plasticizer is kneaded with cement serving as a binder, and molded and hardened. Thereby, a porous body having excellent strength and uniform internal pores can be obtained. If the obtained porous body is used, for example, as a water-permeable pavement material, there is an advantage that an excellent water-permeable function can be exhibited for a long period of time.
Further, when used as a sound absorbing plate, there is an advantage that an excellent sound absorbing effect can be exhibited.

[0011]

【Example】

[Embodiment 1] Hereinafter, the present invention will be described in more detail with reference to the embodiment of FIG. First, 80 parts by weight of white cement, Frog eyes clay
20 parts by weight, 0.01 parts by weight of an organic binder (dextrin), and 1 part by weight of an inorganic pigment are kneaded with water, and this is extruded into a short columnar shape by an extruder, and then spheroidized into a cement aggregate having an average particle size of 1 mm. And This uncured cement aggregate
80 parts by weight, 20 parts by weight of white cement as a binder, 1 part by weight of a pigment, and 0.01 part by weight of an organic dispersant are mixed, and a kneading machine 1
To obtain a mixture having a water content of 4%.

This mixture was filled in a mold of a molding machine 2 and subjected to pressure vibration molding at a pressure of 0.5 kg / cm ² for 5 seconds while applying a vibration having an amplitude of 1 mm and a frequency of 110 Hz. This molded body was held in a curing room 3 at a temperature of 45 ° C. and a humidity of 100% for 8 hours to be forcibly cured to obtain a porous body 4 using cement aggregate. The bending strength of the porous body 4 is 50 kg / cm ² and the compressive strength is 255 kg / cm ² .
It was cm ^2. The porosity is 39.3% and the water permeability (JIS
-A-1218) was 0.3 cm / sec.

On the other hand, the porous body of the comparative example formed under the same conditions as above except that the conventional crushed stone was used as the aggregate had a bending strength of 42 kg / cm ² and a compressive strength of 103 kg / cm ² . Although the porosity was 29.7%, which was lower than that of the product of the present invention, the compressive strength was less than half that of the product of the present invention. And its permeability
(JIS-A-1218) was 0.1 cm / sec, which was only 1/3 of the product of the present invention. Thus, the product of the present invention can achieve both high porosity and strength.

Example 2 Next, the relationship between the compressive strength and the bending strength was examined by changing the porosity of the compact. The results are shown in FIGS. As described above, the strength of the conventional product sharply decreases as the porosity increases, but it can be seen that the product of the present invention maintains high strength even at a high porosity.

[0015]

As described above, according to the method for producing a porous body using the cement aggregate of the present invention, it is possible to obtain a porous body having sufficient internal pores and having the required strength. The porous body is suitable for use as a water-permeable pavement material, a sound absorbing plate, and the like.

[Brief description of the drawings]

FIG. 1 is a process explanatory view of an example.

FIG. 2 is a graph showing a relationship between a porosity of a compact and a compressive strength.

FIG. 3 is a graph showing a relationship between a porosity of a molded product and a bending strength.

[Explanation of symbols]

 1 kneading machine, 2 molding machine, 3 curing room, 4 porous materials

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-7-277855 (JP, A) JP-A-48-74524 (JP, A) JP-A-59-26962 (JP, A) JP-A-57-277 140356 (JP, A) JP-A-4-323004 (JP, A) JP-A-6-279143 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) C04B 38/08 C04B 14 / 02 C04B 28/02

Claims (6)

(57) [Claims] 1. A method for producing a porous body using a cement aggregate, wherein a cement aggregate obtained by spheroidizing a kneaded product of cement and an inorganic plasticizer is kneaded with cement, molded and cured. Method. 2. The method for producing a porous body using cement aggregate according to claim 1, wherein the cement aggregate is composed of 50 to 95 parts by weight of cement and 5 to 50 parts by weight of an inorganic plasticizer. 3. The method for producing a porous body using cement aggregate according to claim 1, wherein the inorganic plasticizer is clay such as Frogme clay or Kibushi clay. 4. The method for producing a porous body using cement aggregate according to claim 1, wherein 10 to 50 parts by weight of cement is kneaded with 50 to 90 parts by weight of cement aggregate. 5. The method for producing a porous body using cement aggregate according to claim 1, wherein the molding is performed by a pressure molding method or a pressure vibration molding method. 6. The method for producing a porous body using a cement aggregate according to claim 1, wherein the cement aggregate undergoes a hydration reaction with the cement to develop strength.