JP2000233961A - Mortar composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain lightweight mortar having sufficient strength and excellent also in adhesive power. SOLUTION: A mortar composition containing cement and a glass aggregate obtained by mixing glass powder with a blowing agent, granulating and calcining the mixture is kneaded with water and hardened to obtain lightweight mortar having sufficient strength and excellent adhesiveness. The strength, particularly compressive strength is enhanced by using silica fume as part of a binder. The strength and adhesiveness are further improved by adding a polymer binder. Since waste glass can be used as the material of the glass aggregate, the mortar is excellent also in the aspect of recycling.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention belongs to the technical field of mortar compositions.

[0002]

2. Description of the Related Art In order to cope with an increase in the size and height of a structure and to save labor, a mortar composition having a lighter weight and a higher strength is required. In order to meet such demands, research has been conducted on reducing the weight and increasing the strength of the aggregate.

Conventionally, lightweight aggregates derived from natural products include pearlite (obsidian), shirasu balloon, and the like.
In addition, in the case of an artificial product, a styrene foam pulverized product or the like has been used.

[0004]

However, all of the above-mentioned conventional lightweight aggregates have insufficient strength and are easy to absorb water, so that the mortar after hardening is damaged by freezing and has poor waterproofness. Further, pearlite having a particle size exceeding 2 mm was easily broken, and was also unstable as an aggregate. Moreover, it is 20-
Thickening to apply more than 30mm may be performed,
Perlite was not suitable for thickening.

[0005] Furthermore, styrene foam has a drawback that it has low compatibility (adhesion) with the cement paste, low strength of the mortar after hardening, and becomes flammable depending on the amount.

[0006]

According to a first aspect of the present invention, there is provided a mortar composition comprising a mixture of cement, glass powder, a foaming agent, granulation, and firing. And a material.

The mortar composition according to the second aspect is characterized in that the mortar composition according to the first aspect contains silica fume. The mortar composition according to claim 3 is the mortar composition according to claim 1 or 2,
It is characterized by including a polymer binder.

[0008] The mortar composition according to claim 4 is the mortar composition according to any one of claims 1 to 3,
The glass powder is derived from waste glass.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION As the cement used in the mortar composition of the present invention, portland cement and alumina cement are exemplified, but there is no particular limitation, and any kind of cement can be used.

[0010] The glass aggregate is a foamed granule produced by mixing a glass powder with a foaming agent (for example, limestone powder) that generates a gas during firing, granulating and firing. An example of manufacturing such a glass aggregate is described in JP-A-10-45449, and the glass aggregate of the present invention is also disclosed in JP-A-10-4549.
What is manufactured by the method described in Japanese Patent No. 5449 may be used.

The glass aggregate is a granular material containing glass as a main component, and has high strength and no water absorption, and can be handled in the same manner as silica sand widely used as an aggregate. In addition, since bubbles are formed inside by the action of the foaming agent, the heat insulating property and the soundproof property are excellent. In addition, since it can be formed into a substantially spherical shape by granulation, it is also an ideal shape as a mortar aggregate. In addition, since the glass itself has no harm, there is no possibility of causing pollution or the like in handling and disposal.

The particle size of the glass aggregate can be arbitrarily set at the time of granulation, but is preferably 0.3 to 5.0 mm. Also,
The bulk specific gravity of the glass aggregate is 0.26 to 0.42, and the mortar composition can be reduced in weight.

[0013] Silica fume is used as part of a binder such as cement. In general, mortar mixed with lightweight aggregate tends to decrease both compressive strength and bending strength.
However, by mixing silica fume, strength,
In particular, the compressive strength is improved. The mixing ratio of silica fume is in the range of 5 to 35%, preferably 10 to 25% of the whole binder such as cement. Since the strength is improved by mixing silica fume, it is suitable as a mortar for repairing concrete, whose use is expected to expand in the future.

As the polymer binder, known powders and emulsions of ethylene vinyl acetate, vinyl acetate, acrylic, SBR, chloroprene and the like can be used without limitation. Is suitable. To this mortar composition, short fibers of vinylon or acrylic can be added for the purpose of improving the strength. The strength can also be improved by adding silica sand as an aggregate. Further, known additives such as a thickener, a workability improver, an antifoaming agent and a water reducing agent can be added.

The proportion of the glass aggregate in the mortar composition of the present invention is preferably 30 to 55% by weight (30 to 70% by volume). The upper limit of this mixing ratio (55
(% By weight, 70% by volume), the strength may be reduced, the workability of ironing work may be deteriorated (basketiness), and the pumpability of the pump may be reduced. On the other hand, the lower limit (30% by weight, 3
(00% by volume), sufficient weight reduction cannot be expected.

The mixing ratio of the other components (cement, polymer, etc.) may be appropriately determined according to the use of the mortar, etc., and the cement is 25 to 5 per 100 parts by weight of the mortar.
0 parts by weight and the amount of the polymer is preferably 2 to 10 parts by weight. The silica sand is preferably used in an amount of 10 to 30 parts by weight. However, if the mixing ratio of the silica sand is increased, the lightness of the mortar composition is impaired. The short fiber content is preferably 0.2 to 3.0 parts by weight. If it is less than the lower limit, the strength is not sufficiently improved, and if it exceeds the upper limit, the strength may be reduced. Other additives (thickeners, workability improvers, defoamers, water reducers, etc.)
May be a compounding ratio according to a standard method.

[0017]

Next, embodiments of the present invention will be described more specifically with reference to examples of the present invention. A mortar composition was prepared according to the formulation shown in Table 1 below. The units of the numerical values in the table are parts by weight.

[0018]

[Table 1]

The mortars obtained by adding water to the mortar compositions of Examples 1 to 4 and mixing with a mixer have an ironing property,
Pumpability was also good. Further, those obtained by curing these mortars are lightweight, have sufficient strength, have excellent adhesive strength, and are suitable for thickening, as shown in Table 2 below. The unit of each strength in the table is MPa.

[0020]

[Table 2]

As comparative examples, Table 3 shows the strength measurement results of a conventional lightweight mortar and a known ordinary mortar (the unit of each strength is MPa). Conventionally, pearlite, shirasu balloon, and styrene foam pulverized products have been used as aggregates in lightweight mortars. One example is a mortar containing pearlite having the following composition.

Material mix (parts by weight) Portland cement 50 Perlite 10 Silica sand 20 Inorganic powder (calcium carbonate, clay) 10 Powder polymer 7 Additives (antifoaming agent, thickener, etc.) 3

[0023]

[Table 3]

Next, Example 5 containing silica fume was used.
7 will be described. The mortar composition was manufactured with the composition shown in Table 4 below. The units of the numerical values in the table are parts by weight.

[0025]

[Table 4]

The mortars obtained by adding water to the mortar compositions of Examples 5 to 7 and mixing with a mixer have the following properties.
Pumpability was also good. Further, those obtained by curing these mortars are lightweight, have sufficient strength, have excellent adhesive strength, and are suitable for thickening as shown in Table 5 below. The unit of each strength in the table is MPa.

[0027]

[Table 5]

[0028]

As described in detail above, claims 1 to 1
When the mortar composition of No. 4 is used, it is possible to obtain a mortar which is lightweight, has sufficient strength, and is excellent in adhesive strength. Moreover, since the glass aggregate has no water absorption, the mortar after hardening does not suffer from freezing damage, does not have low waterproofness, and does not become flammable. In addition, the ironing property is good and suitable for thickening, and the pumping property is also good.

Particularly, when silica fume is used as a part of the binder as described in claim 2, the strength, particularly the compressive strength, of the mortar mixed with the lightweight aggregate can be improved. It is suitable as a repair mortar. Further, since waste glass can be used as a raw material as described in claim 4, it is excellent in terms of resource recycling.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above examples, and it goes without saying that various embodiments can be made without departing from the gist of the present invention.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme Court (Reference) C04B 18:16) 111: 40 (72) Inventor Muneyuki 1339 Koyama, Higashimura Higashimura, Kitase-cho, Inaba-gun, Mie Pref. Obaya Sangyo Mie Plant

Claims (4)

[Claims] 1. A mortar composition comprising cement and a glass aggregate produced by mixing a foaming agent into glass powder, granulating and firing. 2. The mortar composition according to claim 1, further comprising silica fume. 3. The mortar composition according to claim 1, further comprising a polymer binder. 4. The mortar composition according to claim 1, wherein the glass powder is derived from waste glass.