KR101461506B1 - nature-friendly concrete comprising Cement zero binder for floor finishing work - Google Patents

Abstract

The present invention relates to a concrete composition for floor finishing, and more particularly, to a cementitious binder for floor finishing which can secure sufficient strength and fluidity without using any cement at all and an environmentally friendly flooring concrete .

Description

[0001] The present invention relates to a concrete for a floor finish,

The present invention relates to a concrete composition for floor finishing, and more particularly, to an environmentally friendly floor finishing concrete including a cement mortar for floor finishing which can secure sufficient strength and high fluidity without using any cement .

Cement is an environmental load material that contains heavy metals such as hexavalent chromium and the dissolved water is harmful to the human body due to strong alkali and generally produces about 0.8 tons of carbon dioxide per ton of cement.

However, the use of blast furnace slag, which is an industrial byproduct, can save resources and contribute to image enhancement as a eco-friendly material with little heavy metals such as hexavalent chromium, which is greatly reduced in CO ₂ emissions as well as eluted from cement.

In addition, it can reduce the burden of self-weight by lightweight compared to cement. However, since the developed cement-based alkali activated slag binder has a lower fluidity than cement at the same strength, the unit yield per unit volume of concrete is increased in order to secure workability. At this time, the strength is lowered and the material separation occurs.

Also, the alkali active slag binder may be exposed to a high strength by using a strong alkali active agent having a high pH such as NaOH or Na ₂ SiO _3. The alkaline activator used may be a polycarboxyl (PC) or naphthalene (PNS) The fluidizing agent is neutralized and the fluidity can not be exerted. Therefore, the conventionally developed cement active alkali slag binder can not be used as a flooring concrete.

Accordingly, there has been a great demand in the art for cement based binders of new composition that can be applied to the flooring concrete by solving these problems.

As a result of efforts to solve the above problems, the present inventors have completed the present invention by developing cement based binders using three or more alkaline inorganic materials as an alkali activator.

It is therefore an object of the present invention to provide an eco-friendly floor finish concrete comprising a cementitious binder of a new composition capable of exhibiting a required strength even at a high water-binder ratio and a large amount of Fly-ash substitution.

Another object of the present invention is to use a polycarboxyl (PC) -based fluidizing agent or a naphthalene (PNS) -based fluidizing agent in parallel by making it possible to obtain a high strength even though the pH is somewhat low using three or more alkaline inorganic materials, The present invention provides an eco-friendly floor finish concrete containing a cement based binder having a novel composition capable of ensuring high fluidity.

It is another object of the present invention to provide an eco-friendly flooring concrete comprising a cement based binder of a new composition capable of increasing the viscosity without using expensive thickener in order to secure self leveling and prevent material separation .

Another object of the present invention is to provide an eco-friendly floor finish concrete which is not only environmentally friendly but also has a new composition of cement binder which can reduce the weight of the floor finish concrete with a low weight of the blast furnace slag relative to the cement .

The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

In order to achieve the object of the present invention described above, the present invention provides an eco-friendly floor finish concrete comprising 200 to 350 parts by weight of a fine aggregate of fine, twisted, and crown materials per 100 parts by weight of cement mortar for bottom finishing.

In a preferred embodiment, the fine aggregate has a mass ratio of 0.85 to 1: 0.85 to 1.25: 1 to 1.15.

In a preferred embodiment, the bottom cementless cementitious binder comprises 15 to 20 parts by weight of an alkaline activator comprising at least 3 alkaline inorganic materials per 100 parts by weight of raw material comprising at least one of blast furnace slag and fly ash .

In a preferred embodiment, the alkali activator comprises from 30% to 50% by weight of two or more sodium-containing inorganic materials and from 50% to 70% by weight of one or more calcium-containing inorganic materials.

In a preferred embodiment, the sodium-containing inorganic material is selected from the group consisting of sodium hydroxide, sodium sulfate, sodium carbonate, sodium fluoride, sodium silicate.

In a preferred embodiment, the calcium-containing inorganic material is selected from the group consisting of calcium hydroxide, calcium sulfate, calcium carbonate and calcium silicate.

In a preferred embodiment, the alkali activator comprises 10 to 20% by weight of sodium sulfate, 20 to 30% by weight of sodium fluoride, and 50 to 70% by weight of calcium hydroxide.

In a preferred embodiment, the raw material comprises 65 to 100% by weight of blast furnace slag and 0 to 35% by weight of fly ash.

In a preferred embodiment, it further comprises a polycarboxyl (P) based fluidizing agent or a naphthalene (PNS) based fluidizing agent.

In a preferred embodiment, the polycarboxyl (P) based fluidizing agent is included in an amount of 1 to 2 parts by weight per 100 parts by weight of the cement mortar for bottom finishing.

In a preferred embodiment, the naphthalene (PNS) based fluidizing agent is included in an amount of 3 to 5 parts by weight per 100 parts by weight of the cementless binder for bottom finishing.

In a preferred embodiment, it further comprises 1 to 5 parts by weight of effective microorganisms (EM) per 100 parts by weight of the cement mortar binder for bottom finishing.

The present invention has the following excellent effects.

First, according to the present invention, it is possible to exhibit the required strength even in a water-binder ratio and a large amount of Fly-ash substitution.

Further, according to the present invention, a polycarboxyl (PC) type fluidizing agent or a naphthalene (PNS) type fluidizing agent can be used in parallel by making use of three or more alkaline inorganic materials so that the pH is somewhat low, It is possible to secure high fluidity.

Conventional cement floor finishing concrete uses self-leveling and high-priced thickener to prevent material separation. However, since the high viscosity of the material according to the present invention is used, the viscosity can be secured without using a thickener can do.

In addition, according to the present invention, since no cement is used at all, it is environmentally friendly, and the weight of the concrete for floor finishing can be reduced by the low weight of the blast furnace slag compared with cement.

FIG. 1A is a photograph of a slump flow test according to the method of section 6.5 of KS F 4041 for an eco-friendly floor finish concrete obtained in an embodiment of the present invention.
FIG. 1B shows a slump flow test of the concrete for environmentally friendly flooring obtained in another embodiment of the present invention by the method of KS F 4041, Section 6.5. As a result,
FIG. 2A is a photograph of a result of a pH test of eluted water in an eco-friendly floor finish concrete obtained in another embodiment of the present invention,
FIG. 2B is a photograph showing the results of the elution water pH test of Portland cement (OPC) concrete,
FIGS. 3A to 3C are Mock-up exterior photographs obtained by casting an eco-friendly floor finish concrete obtained in the embodiments of the present invention.

Although the terms used in the present invention have been selected as general terms that are widely used at present, there are some terms selected arbitrarily by the applicant in a specific case. In this case, the meaning described or used in the detailed description part of the invention The meaning must be grasped.

Hereinafter, the technical structure of the present invention will be described in detail with reference to the accompanying drawings and preferred embodiments.

However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Like reference numerals used to describe the present invention throughout the specification denote like elements.

The technical feature of the present invention is that a fluidizing agent can be used as a polycarboxyl (PC) -based fluidizing agent and a naphthalene (PNS) -based fluidizing agent at a high water-binding material ratio, It is a cement based binder for flooring of new composition which can increase the viscosity.

That is, in the present invention, similar to the conventional cement-based alkali active binder, the raw materials including at least one of blast furnace slag and fly ash, which are industrial by-products, and an alkaline activator for stimulating the latent hydraulic properties of the raw materials However, unlike the conventional method, by combining an alkaline inorganic material of three or more components with an alkaline activator, the pH is somewhat low, but high strength can be obtained.

Accordingly, the present invention relates to a cement mortar for flooring comprising 10 to 14 parts by weight of an alkali activator comprising at least 3 alkaline inorganic materials per 100 parts by weight of raw material comprising at least one of blast furnace slag and fly ash to provide.

 Here, the blast furnace slag and the fly ash can be used in parallel for the purpose of using the blast furnace slag alone or considering the fluidity and lowering the unit cost. Therefore, the raw material may include 65 to 100 wt% of blast furnace slag and 0 to 35 wt% of fly ash. The compounding ratio of the raw materials is an experimentally determined optimal value for securing self-packing in flow characteristics while exhibiting a required strength.

It is also preferred that the alkali activator of the present invention comprises from 30% to 50% by weight of at least two sodium-containing inorganic materials and from 50% to 70% by weight of at least one calcium-containing inorganic material. Particularly, it is desirable to use 10 to 20% by weight of a primary sodium-containing inorganic material for stability of fluidity and strength development, 20 to 30% by weight of a secondary sodium-containing inorganic material for improving strength and viscosity, Containing inorganic material in an amount of 50 to 70% by weight.

At this time, the sodium-containing inorganic material may be selected from the group including sodium hydroxide, sodium sulfate, sodium carbonate, sodium silicon fluoride, and sodium silicate. As the first sodium-containing inorganic material, sodium sulfate is more preferable, As the material, sodium fluoride is more suitable. The calcium-containing inorganic material is preferably selected from the group consisting of calcium hydroxide, calcium sulfate and calcium silicate.

Thus, the alkali activator used in the present invention may comprise from 10 to 20% by weight of sodium sulfate (Na ₂ SO ₄ ), from 20 to 30% by weight of sodium silicate (Na ₂ SiF ₆ ) and from 50 to 70% by weight of calcium hydroxide have.

The components and mixing ratios of these alkali activators can be adjusted to ensure a low pH that can apply a polycarboxyl (PC) fluidizing agent or a naphthalene (PNS) type fluidizing agent in order to secure hydraulic properties to the raw materials while securing high flowability And is an optimal value determined through a number of experiments.

As a result, the concrete for an underfloor finish of the present invention includes 200-350 parts by weight of fine aggregate of fine, medium and large crossover per 100 parts by weight of the above-mentioned cement mortar for floor finishing, wherein fine aggregates are not single diameters but different diameters The use of silicate, sliver, and quartz to prevent segregation of the concrete composition and ensure packing density can induce strength development and crack inhibition. In order to maximize this effect, it is preferable to use fine aggregate containing silt, medium warp and yarn in a weight ratio of 0.85 to 1: 0.85 to 1.25: 1 to 1.15.

As described above, since the alkali activator included in the cement based binder contained in the affinity light floor finish concrete of the present invention is composed of three or more alkaline inorganic materials and has a relatively low pH, polycarboxyl (PC) based fluidity (PNS) -based fluidizing agent may be used. When the polycarbonate (PC) -based fluidizing agent is used, 1 to 2 parts by weight per 100 parts by weight of the uncrosslinked binder is used. When the naphthalene (PNS) It is preferred to use 3 to 5 parts by weight per 100 parts by weight of cement binder.

The affinity light floor finish concrete of the present invention may further comprise 1 to 5 parts by weight of effective microbes (EM) per 100 parts by weight of the cement mortar binder for floor finishing, if necessary. After the hardening of the concrete by the sulfation of microorganisms, The pH of the pore water is lowered and the strength enhancement by the water reducing effect can be induced. In this case, the effective microorganism may be either powdery or liquid-phase.

Example 1

A cement slag fine powder of 69 wt%, a fly ash fine powder of 20 wt%, an alkali activator of 11 wt% (7 wt% of calcium hydroxide, 1 wt% of sodium sulfate and 3 wt% of sodium fluoride) .

Example 2

In order to confirm the addition amount of the naphthalene-based fluidizing agent satisfying the specifications of the slump flow of 180 mm in the range where the material separation did not occur, the weight ratio of the crown to the mass per 100 parts by weight of the cement mortar for flooring prepared in Example 1 was 1: 250 parts by weight of a fine aggregate mixed in a weight ratio of 1: 1, 4 parts by weight of a naphthalene (PNS) fluidizing agent and 65% by weight of W / B were mixed to prepare an eco-friendly floor finish concrete 1.

Example 3

In order to confirm the addition amount of the naphthalene-based fluidizing agent satisfying the specifications of the slump flow of 180 mm in the range where the material separation did not occur, the weight ratio of the crown to the mass per 100 parts by weight of the cement mortar for flooring prepared in Example 1 was 1: 250 parts by weight of a fine aggregate mixed in a weight ratio of 1: 1, 5 parts by weight of a naphthalene (PNS) fluidizing agent and 65% by weight of W / B were mixed to prepare an eco-friendly floor finish concrete 2.

Example 4

250 parts by weight of a fine aggregate composed of 100 parts by weight of the cement mortar binder for flooring prepared in Example 1 at a weight ratio of 1: 1: 1, 5 parts by weight of a naphthalene (PNS) In order to confirm the compressive strength of W / B concrete with a flow of 200 mm when 25 drops were dropped, concrete was prepared by applying water such that W / B was 50%.

Example 5

250 parts by weight of a fine aggregate composed of 100 parts by weight of the cement mortar binder for flooring prepared in Example 1 at a weight ratio of 1: 1: 1, 5 parts by weight of a naphthalene (PNS) In order to confirm the compressive strength of W / B concrete with a flow of 200mm when 25 drops were dropped, concrete was prepared by applying water so that W / B was 55%.

Experimental Example 1

The concrete 1 and 2 for eco-friendly flooring obtained in Example 2 and Example 3 were tested for slump flow by the method in Section 6.5 of KS F 4041, and the results are shown in the following Table 1 and Figures 1a and 1b. Here, the Mini slump flow shows the diameter of the self-spreading mortar when the slump cone for the table flow test was lifted without a hitting.

mini slump flow Standard of specification Concrete for eco-friendly floor finish 1 180mm More than 180mm Concrete for eco-friendly floor finish 2 195mm

From Table 1 and FIGS. 1A and 1B, it can be seen that when the environmentally-friendly floor finish concrete of the present invention uses the same W / B, the slump value increases in proportion to the addition amount of the fluidizing agent. On the other hand, when the addition amount of the fluidizing agent is 4 parts by weight and 5 parts by weight, it can be seen that the mini slump flow 180 mm, which is the specification standard, is satisfied or exceeded, so that it can be confirmed that sufficient high fluidity can be secured in the field casting. Considering that there is a fear of material separation when the flow (fluidity) increases, it can be seen that the concrete 3 added with 5 parts by weight of the fluidizing agent shows excellent fluidity without separating the materials, and the amount of the fluidizing agent can be increased up to 5 parts by weight .

Experimental Example 2

The flow and compressive strength of the eco-friendly flooring concrete 3 and 4 obtained in Examples 4 and 5 were tested with KS L 5105 and the results are shown in Table 2.

Eco-friendly floor finish
Concrete 3 Eco-friendly floor finish
Concrete 4 W / B 50% 55% flow (mm) 195 220 Pressure
shaft
River
Degree 3 days 22.94 20.24 7 days 32.44 27.18 28th 36.14 30.19

In the case of KS, the compressive strength of floor mortar was evaluated by a free flow of 25 times by a table flow test, and the flow value was 200 mm The compressive strength should be tested with the upper mortar to exceed 12 MPa in 7 days and 21 MPa in 28 days.

From Table 2, it can be seen that the compressive strength of the eco-friendly floor finish concrete 4 obtained in Example 4 and Example 5 is higher than the KS required strength (12-MPa strength of W / B mortar with a flow of more than 200 mm and strength of 21 MPa or more on 28 days) It can be seen that it is exceeding.

Experimental Example 3

The change in length (unit: mm) was measured by the method of section 6.11 of KS F 4041 for the environmentally-friendly floor finish concrete 2 obtained in Example 3 and the measured average values are shown in Table 3. Plastic shrinkage: 1 shrinkage rate in desorption, dry shrinkage: 1 to 4 shrinkage rate

Immediately after demise 1 parking 2 parking 3 parking 4 parking Plastic shrinkage Drying shrinkage Measures 2.73 2.32 2.32 2.32 2.32 0.25% 0% Variation - 0.41 0.00 0.00 0.00

As apparent from Table 3, since there is no drying shrinkage, it can be seen that cracking due to drying shrinkage is minimized.

Experimental Example 4

The eutectic water pH test was performed on the eco-friendly floor finish concrete 2 obtained in Example 3 as shown in Fig. 2A (eco-friendly floor concrete 2: pH 12.03) and Fig. 2b (OPC: pH 12.52). It can be seen that the pH is lower than that of OPC by about 0.5 as shown in FIG.

Experimental Example 5

The eutectic floor finish concrete 2 obtained in Example 3 was tested for the elution of heavy metals and the results are shown in Table 4.

It can be seen from Table 4 that an extremely small amount of heavy metals is detected in comparison with OPC, so that the floor-finishing concrete of the present invention is not only environmentally friendly but also pro-health.

Hexavalent chromium Mercury lead arsenic Copper cadmium Concrete for eco-friendly floor finish 2 Below detection limit 0.003 0.702 0.052 1.207 0.213 OPC 3.281 0.007 16.462 0.178 23.035 16.462

Experimental Example 6

The exterior appearance of the mock-up obtained by placing the concrete 1 to 3 for eco-friendly flooring obtained in Examples 2 to 4 was observed and shown in Figs. 3A to 3C.

It can be seen that no crack or deterioration occurs as shown in Figs. 3A to 3C.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, Various changes and modifications will be possible.

Claims (12)

And 200 to 350 parts by weight of a fine aggregate composed of fine, medium and large crown parts per 100 parts by weight of the cement mortar for bottom finishing,
Wherein the bottom cementless cementitious binder comprises 15 to 20 parts by weight of an alkaline activator comprising at least 3 alkaline inorganic materials per 100 parts by weight of raw material comprising at least one of blast furnace slag and fly ash,
Wherein the alkali activator comprises 10 to 20% by weight of sodium sulfate, 20 to 30% by weight of sodium fluoride, and 50 to 70% by weight of calcium hydroxide.
The method according to claim 1,
Wherein the fine aggregate comprises silicate, sliver and silicate at a weight ratio of 0.85 to 1: 0.85 to 1.25: 1 to 1.15.
delete delete delete delete delete The method according to claim 1,
Wherein the raw material comprises 65 to 100% by weight of blast furnace slag and 0 to 35% by weight of fly ash. The method according to claim 1,
(PC) -based fluidizing agent or a naphthalene (PNS) -based fluidizing agent.
10. The method of claim 9,
Wherein the polycarboxyl (PC) based fluidizing agent is contained in an amount of 1 to 2 parts by weight per 100 parts by weight of the cement mortar for bottom finishing.
10. The method of claim 9,
Wherein the naphthalene (PNS) based fluidizing agent is contained in an amount of 3 to 5 parts by weight per 100 parts by weight of the cement mortar for bottom finishing.
The method according to claim 1,
And 1 to 5 parts by weight of effective microorganisms per 100 parts by weight of the cement mortar for floor finishing.

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