JP2009173468A - Cement based composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cement based composition in which a pseudo polymer is formed in a homogeneous state, and also, values regarding viscosity, fluidity, underwater non-separability, air quantity and material separation resistance are high. <P>SOLUTION: Disclosed is a cement based composition obtained by mixing: a binder composed of cement and expansion material powder; a thickener composed of first powder consisting of a first water soluble low molecular compound selected from cationic surfactants and second powder consisting of a second water soluble low molecular compound selected from anionic aromatic compounds; a fine aggregate; cement admixture powder; and water, and in which unit water quantity lies in the range of 380 to 440 kg/m<SP>3</SP>, the ratio between the water and binder (W/B) lies in the range of 34.0 to 60.0%, the total of the quantity of the first powder and the quantity of the second powder (Vt using quantity) lies in the range of 2.50 to 4.00 kg/m<SP>3</SP>, and the quantity of the cement admixture powder (SP using quantity) lies in the range of 0.90 to 2.00 kg/m<SP>3</SP>. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cementitious composition in which a pseudo polymer is formed in a homogeneous state, and has high evaluation regarding viscosity, fluidity, in-water separability, air content, and material separation resistance.

Conventionally, liquid thickening composed of two liquids, a liquid containing a first water-soluble low molecular weight compound selected from cationic surfactants and a liquid containing a second water-soluble low molecular weight compound selected from anionic aromatic compounds Cementitious compositions such as early-strength water-resistant concrete compositions and high-fluidity mortar compositions with admixtures have been proposed.
When the liquid containing the first water-soluble low molecular compound and the liquid containing the second water-soluble low molecular compound are mixed in the cement at a certain ratio, the first water-soluble low molecular compound and the second water Cement-based composition that not only can ensure proper viscosity by electrically arranging with water-soluble low molecular weight compounds to form a pseudo polymer, but also does not impair fluidity even if viscosity increases to some extent It becomes a thing. Therefore, by using the above thickening admixture, a concrete composition excellent in fluidity and fresh concrete retention with time and a mortar composition excellent in fluidity and self-leveling properties, which were difficult to achieve at the same time, etc. A cementitious composition can be obtained.
In addition, as a mixing ratio of the first water-soluble low-molecular compound and the second water-soluble low-molecular compound, excellent characteristics can be obtained when the ratio is 1: 1 (for example, see Patent Documents 1 to 3). .
Japanese Patent Laid-Open No. 2005-281888 JP 2005-28109 A JP 2006-176597 A

By the way, when the liquid containing the first water-soluble low molecular weight compound and the liquid containing the second water-soluble low molecular weight compound are added simultaneously, the first water-soluble low molecular weight compound and the second water-soluble low molecular weight compound are added. Therefore, in order to obtain a desired characteristic by forming the pseudo polymer in a homogeneous state, it is necessary to knead for a long time.
Therefore, when producing an early-strength water-resistant concrete composition, first, after adding a liquid containing the second water-soluble low-molecular compound to cement, water, and fine aggregate, kneaded to produce a kneaded product The liquid containing the first water-soluble low molecular weight compound was added to the kneaded product and kneaded again, and finally the coarse aggregate was added and kneaded. However, in the production method in which the addition operation and the kneading operation are repeated many times as described above, not only the production takes time, but the first water-soluble low-molecular compound and the second water-soluble low-molecular compound are bonded. Therefore, even in re-kneading, the polymer is formed in a state where it is not sufficiently mixed with the cement. Therefore, there has been a problem that the desired properties cannot be obtained by forming the pseudo polymer in a homogeneous state.
Such problems are not limited to the production of early-strength water-resistant concrete compositions and high-fluidity mortar compositions, but cement-based compositions containing the above thickening admixtures such as other concrete compositions and mortar compositions. It is also a problem when manufacturing.
The present invention has been made in view of conventional problems, and is a cement in which a pseudo polymer is formed in a homogeneous state, and has high evaluation regarding viscosity, fluidity, underwater inseparability, air content, and material separation resistance. An object is to provide a system composition.

The cement-based composition of the present invention comprises a binder comprising a cement and an expanding material powder, a first powder comprising a first water-soluble low-molecular compound selected from a cationic surfactant, and an anionic aromatic compound. A cement-based composition formed by mixing a thickener comprising a second powder composed of a second water-soluble low-molecular compound selected from: a fine aggregate, a cement admixture powder, and water. The unit water amount is 380 to 440 kg / m ³ , the ratio of water and binder is 34.0 to 60.0%, and the sum of the amount of the first powder and the amount of the second powder is 2.50 to 4.00 kg / m ³ , and the amount of cement admixture powder is in the range of 0.90 to 2.00 kg / m ³ .

According to the cementitious composition of the present invention, a binder composed of cement and an expansion material powder, a thickener composed of a first powder and a second powder, a fine aggregate, and a cement admixture Since the powder was mixed with water, the binder, thickener, fine aggregate and cement admixture powder were mixed to form a mixture, and then water was added to the mixture and kneaded. Thus, a cement-based composition in which the pseudo polymer is formed in a homogeneous state is obtained. The unit water amount is 380 to 440 kg / m ³ , the ratio of water to the binder is 34.0 to 60.0%, and the sum of the amount of the first powder and the amount of the second powder is 2. 50 ~ 4.00kg / m ³ , cement admixture powder amount is in the range of 0.90 ~ 2.00kg / m ³ , viscosity, fluidity, water inseparability, air quantity, material separation A cement-based composition having a high evaluation regarding resistance can be obtained.

First, the structure of the mortar composition as a cement-type composition which concerns on the best form is demonstrated.
The mortar composition includes, for example, a cement (C), an expanding material powder (CSA), a thickening admixture powder (Vt), a fine aggregate (S), a cement admixture powder (SP), and an antifoaming agent as shown in FIG. It is formed by mixing powder (E) and water (W).
Mortar by a mixture of cement (C), expander powder (CSA), thickener admixture powder (Vt), fine aggregate (S), cement admixture powder (SP), and antifoam powder (E) A mixture powder is formed.
The binder (B) is formed by the cement (C) and the expansion material powder (CSA).

The thickening admixture powder (Vt) as the thickening material is composed of a first powder and a second powder. The first powder is formed by drying a powder of a first water-soluble low-molecular compound selected from cationic surfactants or a liquid containing the first water-soluble low-molecular compound. The water-soluble low molecular weight compound powder was used. The second powder is formed by drying a powder of a second water-soluble low molecular compound selected from anionic aromatic compounds or a liquid containing the second water-soluble low molecular compound. The water-soluble low molecular weight compound powder was used.
As the cement admixture powder (SP), a carboxyl group-containing polyether water reducing agent powder excellent in compatibility with the thickening admixture powder (Vt) was used.

  As the first water-soluble low molecular weight compound, a quaternary ammonium salt type cationic surfactant is preferable, and an additive mainly composed of an alkyl ammonium salt is particularly preferable. The second water-soluble low molecular weight compound is preferably a sulfonate having an aromatic ring, and particularly preferably an additive having an alkylallyl sulfonate as a main component.

Cement (C) includes ordinary Portland cement, early-strength Portland cement, medium heat Portland cement, white Portland cement such as limestone, clay and iron oxide, blast furnace cement, fly ash cement, silica cement, etc. Use mixed cement.
As the fine aggregate (S), silica sand or the like obtained from river sand is used.
The expansion material powder (CSA) uses a lime composite expansion material powder.
As the defoamer powder (E), a silicon-based defoamer powder is used. The defoamer powder (E) is preferably used in order to prevent bubbles from being generated during kneading and an increase in the amount of air in the mortar, resulting in a decrease in strength and a decrease in specific gravity.

  Next, how to make a mortar composition will be described. Cement (C), expander powder (CSA), thickener admixture powder (Vt), fine aggregate (S), cement admixture powder (SP), and antifoam powder (E) are mixed in a suitable container. Thus, a mortar mixture powder is prepared, and water is added to the mortar mixture powder and kneaded well to prepare a mortar composition.

In the best mode, as shown in FIG. 1, the amount of the cement admixture powder (SP usage amount) is in the proper range of 0.90 to 2.00 kg / m ³ , and the amount of the first powder and the amount of the second powder The sum of the amount of the powder, that is, the amount of the thickening admixture powder (the amount of Vt used) is in an appropriate range of 2.50 to 4.00 kg / m ³ , and the ratio of water to the binder (hereinafter, water binding) The material ratio (W / B) is an appropriate range of 34.0 to 60.0%, and the amount of water per unit volume (hereinafter referred to as the unit water amount (W)) is an appropriate range of 380 to 440 kg / m ^3. A mortar composition was obtained.

An appropriate range of SP usage is 0.90 to 2.00 kg / m ³ , an appropriate range of Vt usage is 2.50 to 4.00 kg / m ³ , an appropriate range of water binder ratio is 34.0 to 60.0%, The appropriate unit water amount range of 380 to 440 kg / m ³ was determined as follows.

  That is, a plurality of mortar composition test specimens were prepared at different material blend ratios with different SP usage, and for each test specimen prepared, the evaluation items shown in FIG. Then, an evaluation test for verifying the air amount and material separation resistance was performed, and an appropriate range of SP usage satisfying the evaluation value set as a target for each evaluation item shown in FIG. 2 was obtained. Similarly, test specimens of a plurality of mortar compositions were prepared at different material blending ratios using different amounts of Vt, and a plurality of mortar compositions were tested at different material blending ratios with different water binder ratios (W / B). A test body of a plurality of mortar compositions was prepared at a material blending ratio in which the unit water amount (W) was varied. Viscosity and fluidity, which are evaluation items shown in FIG. Vt usage amount and water binding material satisfying evaluation values set as targets for each evaluation item shown in FIG. 2 by conducting evaluation tests for verifying underwater inseparability, air amount, and material separation resistance Appropriate ranges of the ratio (W / B) and unit water amount (W) were determined. FIG. 2 shows evaluation items, test methods, and target evaluation values, and FIG. 3 shows details of materials used for the test specimen.

  The material blending ratio for each of the plurality of test bodies subjected to the evaluation test is shown in FIG. 4; 9; 14:19 (a), and the evaluation test results for each of the plurality of test bodies are shown in FIG. 4; 9; (B) Shown in the figure. Then, graphs as shown in FIG. 5 to FIG. 8, FIG. 10 to FIG. 13, FIG. 15 to FIG. 18, and FIG. The straight line in the graph was obtained by the least square method based on the evaluation test result (plot data), and the curve in the graph was obtained by the least square method based on the evaluation test result (plot data). The equation indicated by y = in the graph is a linear or curved equation. Ln (x) in the equation is a natural logarithm. Based on this straight line or curve, the appropriate ranges of SP usage, Vt usage, water binder ratio (W / B), and unit water volume (W) were determined. In the graph, the horizontal line indicated by the solid line is an auxiliary line indicating the minimum and maximum evaluation values, and is indicated by a solid line suspended from the intersection of the straight line or curve obtained by the least square method and the horizontal line indicated by the solid line. A vertical line is an auxiliary line which shows the suitable range of SP usage-amount, Vt usage-amount, water-binding-material ratio (W / B), and unit water amount (W).

FIG. 4 (a) shows a material blending ratio for each of a plurality of test bodies (I-1-1 to I-1-8) having different SP usage amounts, and FIG. 4 (b) shows a plurality of test bodies. The evaluation test results for each are shown in a table. Note that the amount of fine aggregate (S) was reduced in the specimens with a large amount of SP used.
5 to 8 show graphs formed based on the evaluation test results of a plurality of test bodies with different SP usage. 5 is a graph showing the relationship between SP usage and 20 cm flow time, FIG. 6 is a graph showing the relationship between SP usage and 5-minute flow, and FIG. 7 is the relationship between SP usage and pH (hydrogen index). FIG. 8 is a graph showing the relationship between the SP usage amount and the air amount.

From the curve shown in the graph of FIG. 5, 0.90 to 2.00 kg / m ³ is obtained as an appropriate range of the SP usage amount that satisfies the evaluation value (20 to 60 seconds) of the 20 cm flow time for evaluating the viscosity. It was. From the curve shown in the graph of FIG. 6, 0.90 to 3.00 kg / m ³ is obtained as an appropriate range of the SP use amount that satisfies the evaluation value (250 ± 25 mm) of the 5-minute flow for evaluating the fluidity. It was. From the straight line shown in the graph of FIG. 7, 0.00 to 2.20 kg / m ³ is obtained as an appropriate range of the SP usage amount that satisfies the pH evaluation value (12.0 or less) for evaluating the inseparability in water. It was. From the straight line shown in the graph of FIG. 8, 0.65 to 3.00 kg / m ³ was obtained as an appropriate range of the SP usage satisfying the evaluation value (4.0% or less) of the air amount. Moreover, the suitable range of SP usage-amount that the bleeding which evaluates material-separation resistance becomes 0 was 0.00-2.00 kg / m < ³ >.

A plurality of test bodies (I-1-3 to I-1-6) formed at the material blending ratios marked with ○ in the column of comprehensive evaluation in FIG. 4 are mortars that satisfy all of the evaluation values set as targets. It turns out that it is a composition.
From the table of FIG. 4, the extent SP usage of 1.00~2.00kg / m ^3, and the cement (C) is 1120kg / m ^3, the expansion material powder (CSA) is 20 kg / m ^3, viscosity increasing admixture powder (Vt) is 3.25 kg / m ^3, fine aggregates (S) range of 613~610kg / m ^3, antifoam powder (E) is 0.15 kg / m ^3, unit water (W) Is expected to be a mortar composition satisfying all of the evaluation values set as targets. The mortar composition formed at a material blending ratio of 400 kg / m ³ and water binder ratio (W / B) of 35%. Is done.

FIG. 9 (a) shows a material blending ratio for each of a plurality of test bodies (I-2-1 to I-2-6) with different amounts of Vt used, and FIG. 9 (b) shows a plurality of test bodies. The evaluation test results for each are shown in a table. In addition, the amount of cement (C) was reduced in order to make the water binder ratio (W / B) constant in the test specimen with a large amount of Vt used.
FIG. 10 thru | or FIG. 13 shows the graph formed based on the evaluation test result by the some test body which varied Vt usage-amount. FIG. 10 is a graph showing the relationship between Vt usage and 20 cm flow time, FIG. 11 is a graph showing the relationship between Vt usage and 5-minute flow, and FIG. 12 shows the relationship between Vt usage and pH (hydrogen index). FIG. 13 is a graph showing the relationship between the Vt usage amount and the air amount.

From the curve shown in the graph of FIG. 10, 2.5 to 4.5 kg / m ³ is obtained as an appropriate range of the Vt usage amount that satisfies the evaluation value (20 seconds to 60 seconds) of the 20 cm flow time for evaluating the viscosity. It was. From the straight line shown in the graph of FIG. 11, 2.4 to 4.3 kg / m ³ is obtained as an appropriate range of the Vt use amount that satisfies the evaluation value (250 ± 25 mm) of the 5-minute flow for evaluating the fluidity. It was. From the straight line shown in the graph of FIG. 12, 1.8 to 6.0 kg / m ³ is obtained as an appropriate range of the Vt use amount that satisfies the pH evaluation value (12.0 or less) for evaluating the inseparability in water. It was. From the straight line shown in the graph of FIG. 13, 0.0 to 4.0 kg / m ³ was obtained as an appropriate range of the Vt use amount that satisfies the evaluation value (4.0% or less) of the air amount. Moreover, the suitable range of the Vt usage amount in which the bleeding for evaluating the material separation resistance becomes 0 was 2.0 to 6.0 kg / m ³ .

A plurality of test bodies (I-2-4 and I-2-5) formed at the material blending ratios marked with ○ in the column of comprehensive evaluation in FIG. 9 are mortars that satisfy all of the evaluation values set as targets. It turns out that it is a composition.
From the table of FIG. 9, the range Vt usage of 3.00~4.00kg / m ^3, and the cement (C) is 1120~1119kg / m ^3, the expansion material powder (CSA) is 20 kg / m ^3, Cement admixture powder (SP) is 1.25 kg / m ³ , fine aggregate (S) is 612 kg / m ³ , antifoam powder (E) is 0.15 kg / m ³ , and unit water amount (W) is 400 kg / m It is expected that a mortar composition formed with a material blending ratio of m ³ and a water binder ratio (W / B) of 35% will be a mortar composition that satisfies all of the evaluation values set as targets.

FIG. 14 (a) is a table showing the material blending ratio for each of the plurality of test bodies (I-3-1 to I-3-4) with different water binder ratios (W / B), and FIG. ) Shows the evaluation test results for each of the plurality of test specimens in a table. Note that the specimen with the larger W / B reduces the amount of cement (C) to increase the amount of fine aggregate (S), and the specimen with a smaller W / B increases the amount of cement (C) to reduce the amount. The amount of aggregate (S) was reduced.
FIGS. 15 to 18 show graphs formed based on the evaluation test results of a plurality of test bodies with different W / B. 15 is a graph showing the relationship between W / B and 20 cm flow time, FIG. 16 is a graph showing the relationship between W / B and 5-minute flow, and FIG. 17 is a graph showing the relationship between W / B and pH (hydrogen index). FIG. 18 is a graph showing the relationship between W / B and the amount of air.

  From the curve shown in the graph of FIG. 15, 33.5 to 61.0% was obtained as an appropriate range of W / B satisfying the evaluation value (20 seconds to 60 seconds) of the 20 cm flow time for evaluating the viscosity. . From the curve shown in the graph of FIG. 16, 34.0 to 66.0% was obtained as a suitable range of W / B satisfying the evaluation value (250 ± 25 mm) of the 5-minute flow for evaluating the fluidity. From the straight line shown in the graph of FIG. 17, 30.0 to 56.0% was obtained as an appropriate range of W / B that satisfies the pH evaluation value (12.0 or less) for evaluating the inseparability in water. . From the curve shown in the graph of FIG. 18, 30.0 to 60.0% was obtained as an appropriate range of W / B that satisfies the evaluation value (4.0% or less) of the air amount. Moreover, the suitable range of W / B from which the bleeding which evaluates material separation resistance becomes 0 was 30.0 to 60.0%.

A plurality of test bodies (I-3-2 and I-3-3) formed at the material blending ratios marked with ○ in the column of comprehensive evaluation in FIG. 14 are mortars that satisfy all of the evaluation values set as targets. It turns out that it is a composition.
From the table of FIG. 14, the range W / B is 40 to 60% and, cement (C) in the range of 977~643kg / m ^3, the expansion material powder (CSA) is 20 kg / m ^3, fine aggregates ( S) is 729 to 1003 kg / m ³ , Vt usage is 3.25 kg / m ³ , SP usage is 1.25 kg / m ³ , antifoam powder (E) is 0.15 kg / m ³ , unit water volume ( It is expected that a mortar composition formed with a material blending ratio of W) of 400 kg / m ³ will be a mortar composition that satisfies all of the evaluation values set as targets.

FIG. 19 (a) shows a material blending ratio for each of a plurality of test bodies (I-4-1 to I-4-4) with different unit water amounts (W), and FIG. The evaluation test results for each specimen are shown in a table. For specimens with increased unit water volume, the amount of fine aggregate (S) is reduced to increase the amount of cement (C), and for specimens with reduced unit water volume, the amount of fine aggregate (S) is increased. The amount of cement (C) was reduced.
20 to 23 show graphs formed based on the evaluation test results of a plurality of test bodies having different unit water amounts. FIG. 20 is a graph showing the relationship between the unit water amount and the 20 cm flow time, FIG. 21 is a graph showing the relationship between the unit water amount and the 5-minute flow, and FIG. 22 is a graph showing the relationship between the unit water amount and pH (hydrogen index). FIG. 23 is a graph showing the relationship between the unit water amount and the air amount.

From the curve shown in the graph of FIG. 20, 350 to 440 kg / m ³ was obtained as an appropriate range of the unit water amount that satisfies the evaluation value (20 seconds to 60 seconds) of the 20 cm flow time for evaluating the viscosity. From the straight line shown in the graph of FIG. 21, 380 to 440 kg / m ³ was obtained as an appropriate range of the unit water amount that satisfies the evaluation value (250 ± 25 mm) of the 5-minute flow for evaluating the fluidity. From the straight line shown in the graph of FIG. 22, 350 to 465 kg / m ³ was obtained as an appropriate range of the unit water amount that satisfies the pH evaluation value (12.0 or less) for evaluating the inseparability in water. From the straight line shown in the graph of FIG. 23, 365 to 500 kg / m ³ was obtained as an appropriate range of the unit water amount that satisfies the evaluation value (4.0% or less) of the air amount. Moreover, the suitable range of the unit water amount from which the bleeding which evaluates material-separation resistance becomes 0 was 350-450 kg / m < ³ >.

It turns out that the test body (I-4-2) formed with the material mixture ratio which gave (circle) in the column of comprehensive evaluation of FIG. 19 is a mortar composition which satisfies all the evaluation values set as the target. That is, from the table of FIG. 19, the unit water amount (W) is 400 kg / m ³ , W / B is 35%, cement (C) is 1120 kg / m ³ , expansion material powder (CSA) is 20 kg / m ³ , fine bone Material mixing ratio of material (S) 612 kg / m ³ , Vt usage 3.25 kg / m ³ , SP usage 1.25 kg / m ³ , antifoam powder (E) 0.15 kg / m ³ It was found that the mortar composition formed in (1) becomes a mortar composition that satisfies all of the evaluation values set as targets.

  From the graphs of FIGS. 15 to 18, the appropriate range of the SP usage for each evaluation value obtained from the graphs of FIGS. 5 to 8, the appropriate range of the Vt usage for each evaluation value obtained from the graphs of FIGS. The appropriate range of W / B for each obtained evaluation value and the appropriate range of the unit water amount for each evaluation value obtained from the graphs of FIGS. 20 to 23 are collectively shown in FIG.

The appropriate range of the SP usage shown in FIG. 1 was determined as follows. The maximum value among the minimum values of the appropriate range of SP usage for each evaluation value obtained from the graph (for example, the minimum value of the appropriate range of fluidity in FIG. 24A = 0.90 kg / m ³ ). The maximum value of 0.90 kg / m ³ is determined as the minimum value of the appropriate SP usage range that satisfies all the evaluation values, and the appropriate SP usage for each evaluation value obtained from the graph A minimum value (for example, the maximum value of the appropriate range of viscosity = 2.00 kg / m ^{3 in} FIG. 24A) is selected from the maximum values in the range, and the minimum value of 2.00 kg / m ^{3 is set} to all values. The maximum value of the appropriate range of SP usage satisfying the evaluation value was determined. That is, the minimum value and the maximum value of the ranges where the appropriate ranges of the SP usage for each evaluation value obtained from the graph overlap are determined, and the range between the minimum value and the maximum value is determined for all the evaluation values. It was set as an appropriate range of 0.90 to 2.00 kg / m ³ of the SP usage amount that satisfies the value.
Similarly, an appropriate range of 2.5 to 4.0 kg / m ³ for Vt usage satisfying all the evaluation values shown in FIG. 1 is determined, and the water binder satisfying all the evaluation values shown in FIG. An appropriate range of 34.0 to 60.0% of the ratio was determined, and an appropriate range of 380 to 440 kg / m ³ of the unit water amount satisfying all the evaluation values shown in FIG. 1 was determined.

  According to the best mode, the appropriate range of SP usage, Vt usage, water binder ratio, unit water volume satisfying all evaluation values has been determined, so viscosity, fluidity, inseparability in water, air volume, A mortar composition that satisfies all of the target evaluation values described above for the material separation resistance can be obtained.

According to the best mode, powder is used as the first water-soluble low-molecular compound and the second water-soluble low-molecular compound, and the powder is used for the cement admixture, the expansion material, and the antifoaming agent. Compared to the case where the first water-soluble low molecular weight compound and the second water-soluble low molecular weight compound are added separately as in the past by mixing the powder with cement and fine aggregate and then adding water and kneading. Thus, the first and second water-soluble low molecular weight compounds and the cement can be kneaded in a uniformly mixed state. Therefore, the pseudo polymer is formed in a homogeneous state, and not only can the thickening effect of the thickening admixture be fully exerted, but also the mortar composition can be efficiently produced because only one hydration / kneading operation is required. be able to.
Note that it is preferable to mix the first powder and the second powder so that the ratio of the first water-soluble low-molecular compound and the second water-soluble low-molecular compound is 1: 1.

  The cement-based composition of the present invention can be used as a cement-based composition such as an early-strength water-resistant concrete composition or a high-fluidity mortar composition.

The table | surface which shows the appropriate range of SP usage-amount, Vt usage-amount, water binder ratio, and unit water amount in the case of producing a mortar composition. The table | surface which shows the evaluation item, test method, and evaluation value in the evaluation test using the test body of the mortar composition. The table | surface which shows the detail of the used material used for the test body of the mortar composition. (A) is the table | surface which showed the material mixture ratio for every some test body which varied SP usage-amount, (b) is the table | surface which showed the evaluation result for every some test body. The graph which shows the relationship between SP usage-amount and 20 cm flow time. The graph which shows the relationship between SP usage-amount and a 5-minute flow. The graph which shows the relationship between SP usage-amount and pH. The graph which shows the relationship between SP usage-amount and the amount of air. (A) is the table | surface which showed the material compounding ratio for every some test body which varied Vt usage-amount, (b) is the table | surface which showed the evaluation result for every some test body. The graph which shows the relationship between Vt usage-amount and 20 cm flow time. The graph which shows the relationship between Vt usage-amount and a 5-minute flow. The graph which shows the relationship between Vt usage-amount and pH. The graph which shows the relationship between Vt usage-amount and air amount. (A) is the table | surface which showed the material compounding ratio for every some test body which varied W / B, (b) is the table | surface which showed the evaluation result for every some test body. The graph which shows the relationship between W / B and 20 cm flow time. The graph which shows the relationship between W / B and a 5-minute flow. The graph which shows the relationship between W / B and pH. The graph which shows the relationship between W / B and air quantity. (A) is the table | surface which showed the material compounding ratio for every some test body which varied the unit water quantity, (b) is the table | surface which showed the evaluation result for every some test body. The graph which shows the relationship between unit water volume and 20 cm flow time. The graph which shows the relationship between unit water volume and a 5-minute flow. The graph which shows the relationship between unit amount of water and pH. The graph which shows the relationship between unit water quantity and air quantity. A table summarizing the appropriate ranges of SP usage, Vt usage, W / B, and unit water volume determined from the graph.

Explanation of symbols

C cement, CSA expansion material powder, B binder, SP cement admixture powder,
Vt thickening admixture powder (thickening material composed of first powder and second powder), S fine aggregate.

Claims (1)

A binder comprising a cement and an expansion material powder; a first powder comprising a first water-soluble low-molecular compound selected from cationic surfactants; and a second water-soluble low water selected from an anionic aromatic compound. A cement-based composition formed by mixing a thickener composed of a second powder composed of a molecular compound, a fine aggregate, a cement admixture powder, and water, and having a unit water amount of 380 to 380. 440 kg / m ³ , the ratio of water to binder is 34.0 to 60.0%, and the sum of the amount of the first powder and the amount of the second powder is 2.50 to 4.00 kg / m ^3. A cement-based composition characterized in that the amount of cement admixture powder is in the range of 0.90 to 2.00 kg / m ³ .

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