JP2002293587A - Cement dispersant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cement dispersant which is useable as a chemical admix ture for concrete or mortar, is a water reducing agent with high performance and capable of improving workability. SOLUTION: The cement dispersant, the main ingredient of which is polyester fibers covered with acrylic sizing agent, which is prepared by mixing two liquids of a lubricating preparation and acrylic synthetic paste, and adding natural active liquid obtained from vegetables therein, the solution for a sizing agent is obtained. A tow of polyester fiber is passed through the solution and imparts an electrostatic property. After that the polyester fibers is crushed, beaten, chopped up, into a very short fiber. One of characteristics of the dispersant is ionized in a short time and exhibits negative ion activity, if it is put into slurry of the concrete or mortar, and mixed before solidification.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a high-performance water reducing agent used as a chemical admixture for concrete or mortar, and relates to a cement dispersant mainly composed of polyester fibers to which an acrylic sizing agent is attached.

[0002]

2. Description of the Related Art Conventionally, an existing polyester fiber to which an acrylic sizing agent (warp paste or finish paste) is adhered is crushed,
There is a fact that what has been made into extremely short fibers by defibrating or chopping has an effect of preventing cracking when used as a cement dispersant, and has been partially used in the construction industry.

At first, it was understood that the effect of preventing cracks was caused by fibers as has been performed in plastering work since ancient times. In the meantime, it was recognized that it was caused by the chemical components of the acrylic sizing agent used for weaving, but the mechanism (behavior) could not be understood in detail.

In the past, the inventor of the present invention, when handling water mixed with the cement dispersant (hereinafter referred to as an aqueous solution), sees that the boots and the like used for civil engineering work are well removed (cleaning effect) and the locations where water was sprayed. Plants have experienced visibly accelerated growth (growth promoting effect).

[0005] Therefore, material development has been undertaken so that fiber waste, which has been called the cement dispersant with a sense of purpose, can be specifically used as a chemical admixture for concrete or mortar.

In addition to trialing the application to concrete mixing and construction (requesting a test by a construction company), it has independently requested universities and various institutions to analyze the chemical components and effects of the aqueous solution.

At this stage, the aqueous solution containing the component derived from the polyester fiber to which the acrylic sizing agent is attached is an organic acid of an acid molecule, and generates an oxidant (M ³⁺ ) by radical acidity. Alternatively, it has been confirmed as an experimental fact that an anion activity is exhibited when the mortar (slurry) is charged and stirred.

As described above, tests and researches have been repeated and the results of construction have been accumulated, and today, the invention has been completed as a cement dispersant belonging to a identifiable high-performance water reducing agent, and a tentative development (commercialization) To complete. During this time, it has taken several years.

However, as a result of a prior art search prior to the present application, Japanese Patent Application Laid-Open No. H10-259044 entitled "Cement modifier"
[Hereinafter, the invention of the prior application. ] Was extracted. Therefore, when the technical content was examined with great interest, it was found that the prior invention was (unfavorably, partially) unfinished.

In summary of the prior invention, the composition of "a cement modifier characterized by being composed of fibers having a sizing agent attached thereto" is composed of "the sizing agent is of an acrylic type" and "the fibers are polyester fibers". is there. However, it should be said that the constitution of the invention is unknown unless a cement modifier specifically showing its properties is proposed as a substance specified by the composition or the production method.

That is, it can be said that the present invention merely describes the components of the sizing agent of the existing polyester fiber analytically, and describes the use invention in the form of a "cement dispersant comprising fibers to which the sizing agent is attached". .

[0012]

The prior invention is an unfinished invention even if it is considered as a known document, but does not guarantee the technical level of the present invention as the prior art. Although not particularly mentioned, there is doubt about the authenticity of the contents (basic data) described in the examples.

[0013] The present invention is a substance (chemical admixture) derived from polyester fibers to which an acrylic sizing agent is attached and which can be specified by a production method. And a cement dispersant belonging to the category

[0014]

SUMMARY OF THE INVENTION In order to solve the problem, the present invention is a cement dispersant which is used as a chemical admixture for concrete or mortar and mainly comprises polyester fibers to which an acrylic sizing agent is attached. The acrylic sizing agent is prepared by mixing two liquids of a lubricating oil agent and an acrylic synthetic sizing agent, and adding a vegetable natural active sap, and continuously passing one line of polyester fiber in the adjusted solution. Then, after the sizing agent is attached and passed through a sheath to provide charging properties, the fibers are made into ultra-short fibers by pulverization, defibration or chopping.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment of the present invention, the composition of the acrylic sizing agent in the above constitution is such that the lubricating oil is a weak anion mainly composed of a high melting point natural wax, a higher hydrocarbon and a nonionic surfactant. Acrylic synthetic paste is obtained by neutralizing an acrylate copolymer with ammonia, and the prepared solution is a lubricating oil 100
It has an amount ratio of 5 to 12 parts by weight of an acrylic synthetic paste agent to parts by weight. The natural vegetable sap is preferably an aloe extract.

[0016] Then, after one strand of polyester fiber is continuously passed through the sizing agent (in the preparation solution) to attach the sizing agent, and passed through a sheath to impart electrification properties, pulverization, defibration or By chopping, a substance (chemical admixture) which is made into an extremely short fiber is obtained.

The characteristic properties are as follows. (1) The aqueous solution of the substance is an organic acid (CO ₂ ) organic acid, and is oxidized (M ³⁺ ) by radical (OHM) COH acidity
Occurs. (2) The water solution diluted 1000 times is
The hydrogen ion concentration (pH) in the liquid temperature range of 21 to 30 ° C indicates 7.2 to 8.5. (3) When poured and stirred into a concrete or mortar slurry before solidification, it ionizes and exhibits anionic activity. (4) High fluidity is imparted by charging and stirring into a concrete or mortar slurry before solidification. (5) It belongs to a high-performance water reducing agent.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the accompanying drawings.

A warp sizing solvent consisting of two liquids [specifically, an acrylic sizing agent, a weak anion emulsion (preferred product: sorbyl wax) which is a smooth oil rod, and an acrylic synthetic sizing agent (preferred product: Sorghum) and 100: 9
And added with plant natural active juice (preferably aloe extract). Is applied and the polyester fiber provided with the chargeability is pulverized into ultra-short fibers to produce the cement dispersion of the present invention. [Hereinafter, "Moakleet"; trade name of the present applicant. ]

Table 1 shows a component table of "Moakreat".

[0021]

[Table 1]

As shown in Table 1, the amount of "moak cleat" adhered to the polyester fiber (adhesion amount) is about 1% by weight.

Based on experimental facts, the effect of the addition of "moak creat" on the slump value (slump test described later) and compressive strength (compressive strength test described later) will be described below.

The test materials (common) are as follows.

Plain material: As shown in Table 2, test mixes were prepared by mixing empty concrete, and the slump value was adjusted to 2 to 20 cm (every 2 cm) by changing the amount of water. The cement used here is blast furnace cement.

[0026]

[Table 2]

The mower cleat additives: for a similar plane material, added "mower cleat" of 0.8 g / m ³ amount, those 20 seconds kneaded at high speed.

Slump Test Setting The slump value of the moacleate additive with respect to the slump was measured for each of the test cones (Sample Nos. 1 to 15 in the table). Table 3 shows the results.

[0029]

[Table 3]

As can be seen from Table 3, the slump values increased in all samples. Therefore, when it is desired to set the slump variation range to ± 2.0 to ± 3.0 cm in terms of concrete design, the application range of the mohrcrete additive is a slump value set to 6 to 16 cm.

That is, the set slump value is 6 to 16 cm.
"Moak Cleet" for plain materials
The point of addition is that the slump value increases and the slump value can be increased without changing the water / cement ratio (W / C ratio) (or the slump value can be maintained even when the unit water amount is reduced). Suggests that it contributes to improving workability.

Compressive Strength Test For each of the test materials (sample number: 12) having the same set slump value of 6 to 16 cm as described above, the 3-day strength, the 7-day strength, and the 28-day strength were measured. The results are shown in FIGS. 1 to 6 for each set slump value.

As can be understood from the figures, the initial strength of the Mohrcrete additive material up to 3 days of material age is slightly dull (about several percent lower than that of the plain material), but is equivalent at 7 days of material age. The long-term strength estimated on the 28th day was about several percent higher than that of the plain wood.

Other Tests In addition to the above tests, a slump / air volume change test, a mortar performance test, a penetration test, a cement setting test, a breathing test, and an acute toxicity test were performed, but the details are omitted. Note that the test results and the survey results supported the effects described below.

For reference, two examples (use examples 1 and 2) of the construction results are given.

(Usage Example 1) In the construction of an additional purification plant in Hatsukaichi City, Hiroshima Prefecture (as of H12.5 to H13.3), a moacrete additive was used as a concrete for placing the side wall of the septic tank and the floor slab.

For the concrete mix (standard grade concrete), σ = 1
8N-12-20, to which 1 g / m ³ of "Moakreat" was added and the mixture was rotated and stirred. The total casting amount was 2,600 m ³ .

(Example 2) Construction of the Shiose Tunnel (total length of 480 m) on the prefectural road Kanaya-Mibu Line in Midori-cho, Takata-gun, Hiroshima Prefecture (H
Moircrete additive was used as concrete to be placed in tunnel locks and tunnel lining sections from 12.10 to H13.3).

Concrete composition (standard-grade concrete) is σ = 2
8N-15-20, to which 0.8 g / m ³ of "Moakreat" was added and the mixture was rotated and stirred. The total casting amount was 1600 m ³ .

Evaluations common to the above-mentioned use examples 1 and 2 were as follows. Workability (workability) is good, sticky, and it is soft but does not drop even if it has a gradient, so finishing work is easy. Concrete flows smoothly even in places where the rebar is dense or the formwork is narrow (can be filled). Since there is little floating water and ironing can be done immediately after placing concrete, work time can be reduced. Since the stirring property is good (it mixes quickly and well), the pumping pressure of the concrete pump truck can be reduced (the number of rotations can be reduced from the usual 1300 rpm to about 1100 rpm). The finish is beautiful with little latencies and efflorescence on the concrete surface. It has an inhibitory effect on concrete blending, which easily causes breathing and cracking.

[0041]

The present invention has the above-described structure, and according to the present invention, the following effects can be obtained at least with regard to the improvement of the performance of concrete and mortar.

(1) Improvement of workability (workability),
And a reduction in breathing (floating, separating) effects can be expected.

(2) A reduction in the unit water volume can be expected.

(3) It can be expected to promote the development of long-term strength.

[Brief description of the drawings]

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a data plot of each compressive strength (average value of sample) vs. material age of a plain material having a set slump value of 6 cm and an additive of Moarkrete, showing the effect of adding “moakreat” on compressive strength.

[FIG. 2] Similarly, each compressive strength (average value of sample) vs. plain material having a set slump value of 8 cm and moakreat additive material.
It is a data plot of material age.

[FIG. 3] Similarly, each compressive strength (average value of sample) vs. plain material having a set slump value of 10 cm and moircrete additive material.
It is a data plot of material age.

[FIG. 4] Similarly, each compressive strength (average value of sample) vs. plain material having a set slump value of 12 cm and a moacrete additive material.
It is a data plot of material age.

[FIG. 5] Similarly, each compressive strength (average value of sample) vs. plain material having a set slump value of 14 cm and moircrete additive material.
It is a data plot of material age.

[FIG. 6] Similarly, each compressive strength (average value of sample) vs. plain material having a set slump value of 16 cm and moire creat additive material.
It is a data plot of material age.

Claims (3)

[Claims] 1. A cement dispersant which is used as a chemical admixture for concrete or mortar and is mainly composed of polyester fibers to which an acrylic sizing agent is attached, wherein the acrylic sizing agent is composed of a lubricating oil agent and an acrylic synthetic sizing agent. It is a preparation solution obtained by mixing two liquids and adding a vegetable natural active sap. The polyester fiber is continuously passed through the preparation solution, the sizing agent is adhered to the preparation solution, and the preparation solution is passed through the sheath. A cement dispersant characterized by being made into ultra-short fibers by pulverizing, fibrillating, or chopping after imparting chargeability. 2. A cement dispersant which is used as a chemical admixture for concrete or mortar and is mainly composed of polyester fibers to which an acrylic sizing agent is attached, wherein the acrylic sizing agent is composed of a smoothing oil agent and an acrylic synthetic sizing agent. The two liquids are mixed and stored as a preparation solution to which a vegetable natural active sap is added, the polyester fibers are continuously passed through the preparation solution, the sizing agent is adhered, and the sheath is A cement dispersant, which is a substance (chemical admixture) obtained by pulverizing, fibrillating or chopping after imparting chargeability by passing through, and having the following properties. (1) The aqueous solution of the substance is an organic acid (CO ₂ ) organic acid, and is oxidized (M ³⁺ ) by radical (OHM) COH acidity
Occurs. (2) The water solution diluted 1000 times is
The hydrogen ion concentration (pH) in the liquid temperature range of 21 to 30 ° C indicates 7.2 to 8.5. (3) When poured and stirred into a concrete or mortar slurry before solidification, it ionizes and exhibits anionic activity. (4) High fluidity is imparted by pouring and stirring into a concrete or mortar slurry before solidification. (5) It belongs to a high-performance water reducing agent. 3. A lubricating oil is a weak anionic emulsion containing a high melting point natural wax, a higher hydrocarbon and a nonionic surfactant as main components, and an acrylic synthetic paste is used to neutralize an acrylate ester copolymer with ammonia. 3. The cement dispersant according to claim 1, wherein the prepared solution has a quantitative ratio of 5 to 12 parts by weight of the acrylic synthetic paste to 100 parts by weight of the lubricating oil.