JPH11310446A - Highly fluid hydraulic composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a hydraulic composition without deteriorating the fluidity even when a large amount of crushed stones or crushed sand in a civil engineering field is used by compounding an aggregate containing both natural stones or natural sand and the crushed stones or crushed sand with a cement-based material. SOLUTION: Stones exclusively having >=5 mm long sides thereof are called stones in natural stones and crushed stones and sand exclusively having <=5 mm long sides thereof is called sand in natural sand and crushed sand. The natural stones and natural sand mean rounded stones and sand and the crushed stones and crushed sand mean squarish stones and sand. The term rounded means <0.55 expressed in terms of angle of repose and the term squarish means >=0.55 expressed in terms of the angle of repose. The combination of the natural stones and natural sand used with the crushed stones and crushed sand is usually (10:90) to (60:40) expressed in terms of weight ratio. The amount of an aggregate used for a cement-based material is usually 20-300 pts.wt. based on 100 pts.wt. of the cement-based material. Furthermore, a high-performance water-reducing admixture or a plasticizer, or the like, can be mixed therewith.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a hydraulic composition useful in the field of civil engineering and construction.

[0002]

2. Description of the Related Art In recent years, as buildings and structures have become higher and larger, concrete having higher fluidity than conventionally used concrete has been demanded. However, from the viewpoint of fluidity, it is known that using rounded aggregates is more fluid than using flat or angular aggregates. Usually, crushed stone and crushed sand artificially obtained and having many corners are used.

[0003]

The object of the present invention is to improve and improve the above-mentioned technology, that is, to develop a hydraulic composition which does not impair the fluidity even if a large amount of crushed stone or crushed sand is used in the field of civil engineering and construction. With the goal.

[0004]

Means for Solving the Problems The present inventors have conducted intensive studies to solve the above-mentioned problems and completed the present invention. That is, the present invention relates to (1) a hydraulic composition containing an aggregate containing both natural stone or natural sand and crushed stone or crushed sand and a cementitious substance, and (2) 100 parts by weight of cementitious substance. The present invention relates to the hydraulic composition according to the above (1), wherein the aggregate is 50 to 250 parts by weight.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.
The cementitious substance used in the present invention includes various cements such as ordinary Portland cement, early-strength cement, moderate heat cement, various blast furnace cements and the like, and latent hydraulic substances such as granulated blast furnace slag and converter slag, and sodium hydroxide and the like. The mixture of latent hydraulic substance hardening stimulants is also a cementitious substance. Cementitious materials have a brane specific surface area of 30.
It is preferably at least 00 cm ² / g. In addition, not only one having a specific Blaine specific surface area but also two or more cementitious substances having different Blaine specific surface areas may be used in combination.

The aggregate used in the present invention is a combination of natural stone / natural sand and crushed stone / crushed sand. The term “stone” in natural stone or crushed stone and the term “sand” in natural sand or crushed sand referred to in the present invention are generally referred to as “stone” having a long side of 5 mm or more as “stone” or “sand” having a length of 5 mm or less. It does not mean. The natural stone or natural sand referred to in the present invention means "rounded" stone or sand such as sea sand or river sand, and is used in the meaning of "square" stone or sand represented by crushed stone or crushed sand. However, it is not necessarily limited to those naturally produced, and may be artificial stone or sand as long as it is rounded. Similarly, the crushed stone or crushed sand in the present invention means that the crushed stone or crushed sand is solely angular, and is not necessarily limited to those manufactured by crushing. Here, being rounded means that the angle of repose defined below is less than 0.55, and being angular means that it is similarly 0.55 or more. That is, using a funnel outlet having a diameter at least three times the major axis of the aggregate, the aggregate is introduced from above and sand is caused to flow out, and the sand is constantly flowed out until a cone is obtained. At this time, the water is discharged while adjusting the height appropriately so that the upper part of the cone and the lower end of the funnel outlet are not extremely separated. Otherwise, the aggregate has a large amount of momentum, and an accurate angle of repose cannot be measured. The angle of repose is obtained by dividing the height of the obtained cone by the radius of the circle at the bottom of the cone. In the present invention, natural stone and natural sand are used as the aggregate having the largest particle size. Natural stones and natural sands and crushed stones used in the present invention
The combination of crushed sand is 10: 90-60: 40 by weight,
Preferably it is 20:80 to 50:50. The amount of aggregate used for the cementitious material is 1
The amount is usually 20 to 300 parts by weight, preferably 50 to 250 parts by weight based on 00 parts by weight.

[0007] The hydraulic composition of the present invention may contain various high-performance water reducing agents and superplasticizers. For example, a polycarboxylic acid-based high-performance water reducing agent or a naphthalenesulfonic acid-based high-performance water reducing agent can be used. These may be liquid or powdered depending on the mode of use. Various high-performance water reducing agents and superplasticizers to be used vary depending on the type, but 0.01 to 1 part by weight based on 100 parts by weight of the cementitious substance.
0 parts by weight.

Various additives are added to the hydraulic composition of the present invention.
Modifiers can be incorporated. For example, if the structure is to be dense or high strength, or if it is desired to reduce breathing, fine powder can be added. The fine powder is, specifically, silica fume, siliceous dust, calcium carbonate, silica gel, titanium oxide, aluminum oxide, opal silica, fly ash, and a Blaine value of 1 as by-products in the production of silicon alloy and zirconia.
Granulated blast furnace slag of 0000 cm ² / g or more can be mentioned.
Granulated blast furnace slag of m ² / g or more is preferred. The amount of the fine powder to be used varies depending on the type, but is generally 1 to 50 parts by weight based on 100 parts by weight of the cementitious substance. If it is desired to obtain expandable or non-shrinkable concrete or mortar, an expanding material can be added. As the expansive material, an aluminum-based powder is used when the initial expansibility is given, and if the subsequent expansibility is expected, K is used.
Shaped, S-shaped, and O-shaped expanding materials can be used. The amount of the expanding material varies depending on the type thereof, but is generally 0.01 to 50 parts by weight based on 100 parts by weight of the cementitious substance. Furthermore, when necessary, various antifoaming agents can be used. The amount of the defoaming agent used varies depending on the type, but it is generally 0.1 to 100 parts by weight of the cementitious substance.
01 to 10 parts by weight.

[0009] Fresh mortar and fresh concrete can be obtained by adding water to the hydraulic composition of the present invention. The amount of water to be used depends on the specific surface area of the cementitious substance (latent hydraulic substance when a mixture of the latent hydraulic substance and the hardening stimulant is used) in the present invention,
Although it greatly varies depending on the type and amount of the dispersant used as needed, and the type and amount of various admixtures such as an expanding agent added as needed, usually 20 to 60 parts by weight per 100 parts by weight of the cementitious substance is used. It is preferred to use parts by weight. The fluidity of these hydraulic compositions can be adjusted by appropriately adjusting the amount of water and the like, and can be cured by, for example, being poured into a mold. At the time of curing, a cured product can be obtained by leaving it in an atmosphere of, for example, a temperature of 20 ° C. and a humidity of 60% without using a special curing method. If accelerated curing is desired, for example, curing can be performed in an atmosphere at a temperature of 60 ° C. and a humidity of 95%.

[0010] The present invention will be described in more detail by way of examples, but the present invention is not limited thereto.
In the examples, the flow value, bending strength and compressive strength were all measured according to JIS R5201.

Example 1 750 weight of ordinary Portland cement (made by Chichibu Onoda)
Part, Brain specific surface area 4,000cm²/ G blast furnace water
Crushed slag (Nippon Steel Chemical) 1500 parts by weight, silica
75 parts by weight (made by EFACO), Chichibu silica sand No. 2 (natural
Sand, angle of repose 0.45-0.53) 975 parts by weight, Chichibu silicon
Sand No.4 (crushed sand, angle of repose 0.62-0.69) 975 weight
Part, Chichibu silica sand 6 (crushed sand, angle of repose 0.55 to 0.57)
495 parts by weight, aluminum expander convex 10
0 (made by Fosrock) 3 parts by weight, O-based expansion material Onoda Ec
120 parts by weight of span, high performance water reducer Mity 100 (flower
10.5 parts by weight, Defoamer SN Dayformer
3 parts by weight of NONPCO) were sufficiently mixed with powder and mixed with 64 parts of water.
Add 5 parts by weight and knead with a planetary mixer for 5 minutes.
A hydraulic composition was obtained. Measure flow value with flow table
As a result, F0 and F15 are 140 mm and 180 mm, respectively.
mm, and after 60 minutes, 110 mm and 16 mm, respectively.
It was 0 mm. This is 4cm x 4cm x 16cm formwork
1 day, 3 days, 7 days, 28 days in a sealed state at 20 ° C
The compressive strength after production is 94 kg / cm respectively.², 3
00kg / cm², 384kg / cm², 482 kg
/ Cm ²Met.

[0012]

The hydraulic composition of the present invention can improve the flowability by adjusting the type and amount of the aggregate, and can provide a hydraulic composition suitable for the use site. That is, by using natural stones and natural sands having a large particle size and using a large amount of crushed stones and crushed sands having a smaller particle size, a hydraulic composition having economical fluidity is provided. In addition, the crushed stone and the crushed sand play a role of refilling in the major axis direction by the combination, and contribute to reduction of shrinkage. Therefore, it can serve as a basic composition of non-shrinkage concrete and mortar.

Claims (2)

[Claims] 1. A hydraulic composition containing an aggregate containing natural stone or natural sand and both crushed stone or crushed sand and a cementitious substance. 2. The hydraulic composition according to claim 1, wherein the amount of the aggregate is 50 to 250 parts by weight based on 100 parts by weight of the cementitious substance.