JPH10279342A - Concrete composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain concrete having high strength and toughness by using natural zeolite having a base substitution function as aggregate and mixing a high- polymer aq. emulsion and cement therewith under agitation, thereby forming the concrete. SOLUTION: This concrete compsn. is formed by using the natural zeolite having the base substitution function as the aggregate, adding inorg. filler agents and fibrous reinforcing materials and mixing the high-polymer aq. emulsion and the cement therewith under agitation. The water in the high-polymer aq. emulsion is electrolyzed by the permanent charge by the base substitution function of the natural zeolite to generate hydrogen and to accelerate the water reducing effect reaction of the hydraulic cement. Further, the crystal structure axes of the zeolite are misaligned and, therefore, the charge accumulation quantity is changed by grain sizes, by which the initial strength development rate of the concrete may be changed. Pyroelectric self-firing is induced by the effect of the permanent charge, by which high hardness is obtd. An acrylic resin is used for the high polymer of the high-polymer aq. emulsion and the water having the small clusters of molecules and high penetrability is preferably used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete composition prepared by mixing a mixture of natural zeolite having a base substitution capacity and hydraulic cement with a polymer-based aqueous emulsion, and particularly to a concrete secondary product. In this regard, there have been demands for productivity improvement by shortening the initial strength development, light weight, high hardness and toughness expansion performance, which have been major problems in the past. If this problem can be solved, it will have a remarkable effect on prevention of impact damage and workability. In concrete structures, great effects can be expected on reinforcement, waterproofing, and shortening the construction period due to high adhesive strength. This technology is expected to be widely used in building materials and civil engineering.

[0002]

2. Description of the Related Art The time required for a conventional concrete composition to reach its final strength is about four weeks. The reason is,
This is because the hydration-hardening reaction of the cement in the concrete composition is completed, and it is necessary to have time for the reaction and release of moisture corresponding to the strength development. In order to solve this problem, a process of shortening the strength development time using an early-strength cement, a water reducing agent, or the like may be used, but the probability of occurrence of cracks is high. Also, recently, a concrete composition obtained by mixing an aqueous polymer emulsion with a mixture of garnet and cement, which are ultra-hard particles, has been developed and started to be used. When this material is combined with a conventional concrete composition, the performances such as impact resistance, high hardness toughness, and adhesiveness are greatly improved. This is a fine sand-like garnet having a surface hardness close to that of a gem, and was constituted by the high hardness of particles as a concrete aggregate and the permeability of a composite concrete surface of a polymer-based aqueous cement emulsion. However, the garnet having a high price is used as a raw material, the specific gravity of the garnet is as high as about 4, and the specific gravity difference between the garnet and the cement is large. Therefore, while it is good for reinforcing existing cracks, repairing cracks, and waterproofing the floor, it is technically necessary to solve this problem in the use of secondary concrete products.

[0003]

SUMMARY OF THE INVENTION In order to solve these problems, it is necessary to use a low-cost raw material, to be lightweight, to have a high hardness and toughness, and to shorten the time required for developing the strength necessary for improving the productivity. There has been a desire for a possible concrete composition.

[0004] In the concrete composition to be solved by the invention, how to reduce the strength development speed by using a lightweight aggregate raw material, and to mix high hardness and tough lightweight concrete Was able to be obtained.

[0005]

SUMMARY OF THE INVENTION In the course of studying the compounding material of a composition of a water-curable cement using a polymer-based aqueous emulsion, the present inventor reduced the weight of a concrete composition and the rate of strength development. Focusing on the physical properties of concrete aggregates, as a major factor in shortening and increasing toughness with high hardness,
As a result of conducting experiments using various types of aggregates, we found that the base substitution function in natural zeolite exerts a great effect function, and as a result of using this as an aggregate,
It has been confirmed that it is possible to obtain a lightweight concrete composition having a reduced strength development speed and high hardness and toughness.Furthermore, by appropriately changing the particle size distribution of the zeolite, it is possible to adjust the initial hardness development speed. Thus, the present invention has been completed.

The principle of the present invention is to use a natural zeolite having a base substitution function in the crystal structure as a concrete aggregate in a polymer-based aqueous emulsion-mixed hydraulic concrete composition to provide a permanent charge electrolysis effect. As a result, the water of the polymer-based aqueous emulsion causes electrolysis, and the generated hydrogen promotes the water reducing effect reaction of the hydraulic cement. Further, since the crystal structure axis of the zeolite is shifted, the charge accumulation amount can be changed depending on the particle size. By this effect, the strength development speed can be shortened and controlled, and the required initial strength and high hardness can be obtained.

[0007] Hydraulic polymer cement emulsion in which water clusters have been reduced by low voltage electrolysis penetrates into voids in the crystal of the natural zeolite aggregate,
Produces a reinforcing effect on bending and gives toughness. Further, by the action of the permanent crystal charge, Shoden self-firing is performed, and high hardness is obtained. This makes it possible to produce a concrete composition that is lightweight, has a reduced strength development speed, and has high hardness and toughness.

[0008] In the concrete composition, aggregates focused on the base substitution function of natural zeolite are logically used,
In addition, a concrete composition made by stirring and mixing a polymer aqueous emulsion and cement is not in the prior art, and further, utilizing the particle size distribution region of the zeolite,
The concrete composition which enables the control of the initial strength development rate is a completely new technology.

[0009] The natural zeolite material used in the aggregate of the concrete composition that produces the properties of the present invention is a natural mineral called zeolite. Natural zeolites are classified into those having a large base substitution capacity and those having a small base substitution capacity. The natural zeolite used in the present invention mainly has a crystal structure with a large function called the former base substitution capacity. This action has the permanent charge characteristic of holding and releasing cations, like a magnet. Further, the amount of crystal charge accumulation can be changed according to the particle size.

The aqueous polymer emulsion is an aqueous solution prepared by dispersing polymer fine particles in water. An acrylic resin is generally used among polymers, but other polymers may be used. As the water used in the polymer-based aqueous emulsion, it is preferable to use highly permeable water having small clusters of water molecules by wave or low electrolysis.

As the cement, hydraulic portland cement and white cement are used. In addition to these four elements, an inorganic fine filler such as garnet may be added as a reinforcing filler if necessary.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The concrete composition according to the present invention is obtained by mixing a natural zeolite aggregate having a large base substitution function into a polymer aqueous cement emulsion and hardening it, as compared with a conventional homogeneous concrete mixture. Dramatically, it is possible to obtain a high-hardness, tough, lightweight concrete composition with a high toughness and a high rate of strength development. It is useful for materials, partition materials, etc.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to figures and figures.
The present invention is not limited by this.

Cation exchange capacity 180 ± 10 meg / l
oog, a mixed material of 50 wt% of natural zeolite having a standard particle size of 10 to 16 mesh, 50 wt% of portland cement, and 35 ml of acrylic resin, 230 ml of a polymer emulsion of 65 wt% of water are stirred and mixed to prepare a concrete composition. The following physical properties were shown as a result of confirming the physical properties in accordance with JIS5201. Material age 14 days material age 28 generally mortar nominal compressive strength 550Kgf ^/ cm ² 200Kgf ^/ cm 2 flexural strength 140Kgf ^/ cm ² 45Kgf ^/ cm 2 adhesive strength 25kgf ^/ cm ² 9Kgf ^/ cm 2 demold time of 12 hours 48 hours or more From the results, it was demonstrated that the effect of the base exchange function of the natural zeolite particles produces an excellent concrete composition in the mixture of the cement and the polymer aqueous emulsion.

[0014]

The present invention has the following advantages because of the above configuration. (A) The weight reduction and initial strength development of the concrete composition can be controlled by the zeolite's base substitution function and particle size selection effect, which greatly contributes to productivity improvement, cost reduction, transportation and construction of secondary concrete products. I can do things. (B) The zeolite is a natural inorganic material, and its value is significantly lower than that of garnet. In particular, when used as an aggregate of a concrete composition, if the particle size is selected, the cement mortar can penetrate and adhere to the porous crystal surface, and the toughness of the concrete composition at high hardness can be improved. Therefore, it is possible to produce a high-strength concrete secondary product that is inexpensive, lightweight, has high surface hardness, and has high impact resistance. (C) The concrete composition can be self-fired by the action of the crystal permanent charge of the zeolite, and its surface hardness is improved to a region close to pottery, so that trauma can be prevented. Therefore, transportation packaging materials and transportation costs can be saved.

[Brief description of the drawings]

FIG. 1 shows a model of a crystal axis misalignment of a natural zeolite having a base substitution function used in a concrete composition of the present invention, and a schematic drawing of an electrolysis mechanism of hydrogen-generating water for retaining a crystal charge by the model.

Fig. 2 Schematic drawing of hydroxyl ions of water with unstable hydrogen molecules, produced by low-voltage electrolysis of water by crystal charge accumulation

FIG. 3 is a schematic view of a concrete composition of the present invention having a toughness effect on a zeolite particle surface by a permeation adhesion mechanism on the surface of the composition.

[Explanation of symbols]

1 shows the body of the porous crystal model of a natural zeolite having a base substitution capacity 2 shows the displacement of the axis of the zeolite 3 shows that water is electrolyzed by the crystal charge
Shows the molecular structure of hydroxyl ions 4 Shows hydrogen molecules that are easily released in the molecular structure 5 Shows the porous crystal surface of the zeolite 6 State of polymer aqueous emulsion cement mortar that permeates and adheres around the porous crystals Show

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Claims (3)

[Claims] 1. A concrete composition prepared by mixing a mixed material of zeolite having a base substitution capacity and hydraulic cement with a polymer aqueous emulsion. 2. The concrete composition according to claim 1, wherein the zeolite has a different particle size to change the initial strength development rate. 3. The concrete composition according to claim 1, wherein an inorganic filler, a fiber and a chip-like reinforcing material are mixed or compounded.