CN101535207A - Cement mortar composition for grout and grout mortar obtained from the same - Google Patents

Abstract

To provide a cement mortar composition for grouting and grouting using the same, the cement mortar composition for grouting can maintain good fluidity, no bleeding or material separation, high strength, high durability, and has the advantages of reduced drying shrinkage The resulting anti-cracking properties are used in mechanical foundations, etc. It is characterized in that in the cement mortar composition for grouting formed by containing a binding material, a setting retarder, a water reducing agent and fine aggregate, the binding material contains a fast curing agent and volcanic ash fine powder, the water reducer contains at least polycarboxylate water reducer, and the fine aggregate is heavy aggregate with a density of 3.0 g/cm ³ or more. In addition, the grout is obtained by kneading the cement mortar composition for grouting and water.

Description

Cement mortar composition for grouting and grouting using same

technical field

The present invention mainly relates to a cement mortar (cement mortar) composition for grout used in civil engineering and construction, in particular, relates to a cement mortar composition with good fluidity, high strength, high durability and low shrinkage Cement mortar composition for grouting and grouting (grout mortar) using the same.

Background technique

In the past, as a grouting material, a water reducing agent was generally added to cement, and further, a calcium sulfoaluminate-based or lime-based expansion material or a foaming agent such as aluminum powder was added to prevent shrinkage, and then mixed with these River sand or silica sand is used as paste or mortar, which is widely used in civil engineering and construction engineering, especially for small gaps in concrete structures, gaps generated in inverted masonry methods, repair or reinforcement of structures, and mechanical devices. Construction methods for filling under foundations and track cement slabs, etc.

Among the grouting materials, there are PC grouting, grouting for precast concrete, filling grouting for tunnels or shield tunnels, grouting for precasting, injection grouting for repairing or strengthening structures, grouting for steel bar joints, grouting under bridge supports, grouting under mechanical foundations, paving Grouting under cement slabs, grouting under track cement slabs, grouting under storage containers of atomic power stations, etc.

In addition, as the cement mortar composition for grouting, there are known fast-setting compositions containing a fast curing agent (see Patent Documents 1 to 4), and Patent Document 2 also discloses the following content: In these cement mortar compositions for grouting In the product, a setting regulator (setting delay agent) and a fluidizing agent (water reducing agent) are mixed together with a fast curing agent, and among them, calcium aluminosilicate glass (calcium aluminosilicate glass) is used as a fast curing agent Fast curing agent for gypsum formation.

By using these cement mortar compositions for grouting, it is possible to make grout that has excellent strength development and can ensure a certain fluidity, but it is still required to ensure better fluidity without producing bleeding (bleeding). ) or a material-separated, high-strength, high-durability and low-shrinkage cement mortar composition for grouting.

Patent Document 1: JP-A-2001-97759

Patent Document 2: JP-A-2006-27937

Patent Document 3: JP-A-2006-104013

Patent Document 4: Patent No. 2861612

Furthermore, the invention of a concrete admixture mainly composed of calcium aluminosilicate glass (calcium aluminosilicate glass), inorganic sulfate (gypsum) and reactive siliceous substance (pozzolan fine powder) is known (Patent Document 5) , However, Patent Document 5 does not disclose the use of such a concrete admixture in a cement mortar composition for grouting.

Patent Document 5: Patent No. 2975422

On the other hand, Patent Document 6 also discloses that among the mortar compositions mixed with concrete, expansive material, and pozzolan fine powder, a fine aggregate, and a water reducer, mortar compositions with a mixing specific gravity of 3.0 or more are known. Heavy aggregate as fine aggregate is mainly used in the invention of a mortar composition for filling constructions such as shielding walls of nuclear power stations and foundation structures of mechanical devices (see Patent Document 6), thereby providing a method that does not Heavy mortar that produces separation of materials, has good fluidity, suppresses temperature rise, and is not prone to cracks caused by temperature stress. However, Patent Document 5 does not disclose that such a heavy mortar is applied to quick-setting type grouting.

Patent Document 6: JP-A-2005-47772

Contents of the invention

The purpose of the present invention is to provide a cement mortar composition for grouting, which can be well adapted to the above-mentioned multi-purpose mechanical foundation grouting, etc., and maintains good fluidity, and has high strength and high durability without bleeding or material separation. and low shrinkage; and a grout using the composition.

In order to solve the above-mentioned problems, the present invention employs the following means.

(1) A cement mortar composition for grouting, which is formed by containing a binding material, a setting retarder, a water reducing agent and fine aggregate, wherein the binding material contains cement, calcium aluminum silicate A fast curing agent formed of glass and gypsum and pozzolan fine powder, the water reducer contains at least a polycarboxylate water reducer, and the fine aggregate is a heavy aggregate with a density of 3.0 g/cm ³ or more.

(2) The cement mortar composition for grouting according to (1) above, wherein the pozzolan fine powder is a siliceous fine powder having a silica content of 90% or more and a hydrogen ion concentration in an acidic range.

(3) The cement mortar composition for grouting according to the above (1) or (2), wherein the cement contains classified fine powder cement.

(4) The cement mortar composition for grouting according to any one of the above (1) to (3), wherein the binder further contains an expansive material.

(5) The cement mortar composition for grouting according to the above (4), wherein the expansion material is a calcium sulfoaluminate-based expansion material having a Blaine value of 4000 cm ² /g or more.

(6) The cement mortar composition for grouting according to any one of (1) to (5) above, wherein the water reducer further contains a melamine sulfonate-based water reducer.

(7) The cement mortar composition for grouting according to any one of the above (1) to (6), which further contains a shrinkage reducing agent.

(8) The cement mortar composition for grouting according to any one of the above (1) to (7), which further contains a foaming substance.

(9) The cement mortar composition for grouting according to any one of the above (1) to (8), which further contains a thickener.

(10) A grout produced by kneading the cement mortar composition for grouting according to any one of the above (1) to (9) and water.

(11) The grouting as described in said (10) whose water is 31-36 parts with respect to 100 parts of binders.

By using the grouting composition of the present invention, it is possible to provide a grout that maintains good fluidity and does not produce bleeding or material separation, has high strength and high durability, and has the ability to prevent cracking caused by drying shrinkage (low shrinkage). performance grouting.

Detailed ways

Hereinafter, the present invention will be described in detail.

In addition, parts and % used in the present invention refer to mass standards unless otherwise specified.

In the present invention, the cement mortar composition and water are used for mixing and grouting to prepare grouting, wherein the cement mortar composition for grouting contains fast curing agent, pozzolanic powder, setting delay agent, water reducer and heavy aggregate, according to If necessary, it can also contain expansion material, shrinkage reducing agent, micropowder cement, foaming substance, and tackifier.

Examples of cement used in the present invention include various Portland cements such as ordinary, early-strength, low-heat, and medium-heat cements, and waste-recycled cements, ie, environmentally friendly cements.

In the present invention, micropowder cement can be used as part of the cement. Micropowder cement uses ordinary Portland cement crushed into a particle size of 20 microns or less, and then graded into a cement with a particle size of 10 microns or less. The amount used in 100 parts of the binder (the total amount of cement, fast curing agent, pozzolan powder, and expansion material, the same below) is preferably less than 5 parts. If it exceeds 5 parts, the effect of inhibiting bleeding may not be achieved, or it may be damaged. issues like mobility.

The fast curing agents used in the present invention are formed from calcium aluminosilicate glass and gypsum.

The calcium-aluminosilicate glass involved in the present invention preferably has a composition range of 60-30% CaO, 20-60% Al ₂ O ₃ , and 5-25% SiO ₂ , more preferably 55-30% CaO, Al ₂ O ₃ is 30 to 60%, and SiO ₂ is 10 to 25%. If CaO is less than 30% or _Al2O3 is more than 60%, the rapid curing property will be deteriorated. On the contrary, if _CaO is more than 60% or _Al2O3 is less than 20%, even if a large amount of setting retarder _is added, it will be set instantly. If SiO ₂ is less than 5%, long-term strength elongation cannot be obtained, and on the contrary, if it exceeds 5%, the initial strength will decrease.

The raw material of calcium aluminum silicate glass related to the present invention can use quicklime (CaO), slaked lime (Ca(OH) ₂ ), limestone (CaCO ₃ ), etc. as CaO raw materials, and alumina, alumina, diaspore , feldspar, clay, etc. are used as Al ₂ O ₃ raw materials, and quartz sand, clay, diatomaceous earth, etc. are used as SiO ₂ raw materials.

Manufactured by the following method. Mix the above CaO-based raw materials, Al ₂ O ₃ -based raw materials, and SiO ₂ -based raw materials in a prescribed ratio, dissolve them in a direct-conducting melting furnace or a high-frequency furnace, and blow the resulting molten body through compressed air or high-pressure water. The method of flying, or the method of throwing the molten body into water, or melting and quenching the raw materials with a rotary kiln.

In terms of strength development, the particle size of calcium aluminosilicate glass is preferably at least 3000 cm ² /g, more preferably at least 5000 cm ² /g. If it is less than 3000 cm ² /g, there is a danger of lowering the strength development.

Examples of gypsum include anhydrous gypsum, hemihydrate gypsum, and dihydrate gypsum, and one or more of these can be used. Among them, anhydrous gypsum is preferable from the viewpoint of strength development.

From the viewpoint of strength development, the particle size of gypsum is preferably a Blaine value of 3000 cm ² /g or more, more preferably 5000 cm ² /g or more. If it is less than 3000 cm ² /g, there is a danger of lowering the strength development.

The amount of gypsum used is preferably 50 to 150 parts per 100 parts of calcium aluminosilicate glass. If it is less than 50 parts or exceeds 150 parts, the strength development property will fall.

The addition amount of the fast curing agent is preferably 9 to 25 parts per 100 parts of the binder. If it is less than 9 parts, the strength development property may decrease, and if it exceeds 25 parts, the effect will be saturated.

The fine pozzolan powder used in the present invention is a material that has good fluidity and strength development especially in a low water ratio, so it is preferable that the content of silicon dioxide (SiO ₂ ) is 90% or more, and the hydrogen ion concentration is in the acidic region. Silica fine powder.

The production method of siliceous fine powder is as follows, for example, in the method of oxidizing metal silicon fine powder in flame, or in the method of melting siliceous raw material fine powder in high temperature flame, by adjusting the heat treatment conditions of raw materials, set the collection temperature to 550°C or more To produce silicon micropowder. In addition, it is produced by melting zircon sand (zircon sand) in an electric furnace, collecting it with a cyclone, etc., and classifying it.

The amount of fine pozzolan powder used is preferably 5 to 15 parts per 100 parts of the binder. If it is less than 5 parts, there will be the following problems: the development of strength is not good; the effect of ball bearing (ball bearing) disappears, and the load during kneading becomes large; and excellent fluidity in a predetermined amount of water cannot be obtained. If it exceeds 15 parts, the fluidity effect will become saturated, and the strength development property will fall.

The expansion material used in the present invention is not particularly limited, and expansion materials generally sold on the market can be used, and any one of calcium sulfoaluminate-based expansion materials, calcium-aluminoferrite-based expansion materials, and lime-based expansion materials can be used.

The amount of the expansion material used is preferably 1 to 5 parts per 100 parts of the binder. If it is less than 1 part, the shrinkage reduction effect is poor, and if it exceeds 5 parts, not only the shrinkage reduction effect cannot be achieved, but also the compressive strength will be reduced.

The setting delaying agent used in the present invention is a delaying agent for adjusting setting and curing of fast-curing mortar, and contains one or more of organic acids and alkali metal carbonates.

Examples of organic acids include hydroxycarboxylic acids such as citric acid (anhydrous), tartaric acid, and gluconic acid, or alkali metal salts such as their salts. The amount of organic acids used is preferably 0.1 to 0.3 parts per 100 parts of the binder. If it is less than 0.1 part, the curing time may not be controlled, and if it exceeds 0.3 part, the strength development may decrease.

Examples of the basic metal carbonate include carbonates such as lithium carbonate, sodium carbonate and calcium carbonate, and bicarbonates such as sodium hydrogencarbonate and potassium hydrogencarbonate. It is preferable that the usage-amount of an alkali metal carbonate is 0.3-0.8 part with respect to 100 parts of binders. If it is less than 0.3 part, the desired effect of accelerating strength development after curing may not be achieved, and if it exceeds 0.8 part, initial strength development may be reduced.

The shrinkage reducing agent used in the present invention suppresses the drying shrinkage of the grouting after curing, and suppresses the generation of cracks, and the constituents that constitute the shrinkage can be RO(AO)nH (R is an alkyl group with 4 to 6 carbon atoms, A is one or two or more olefins with 2 to 3 carbon atoms, and n is an integer of 1 to 10) The alkylene oxide adducts of lower alcohols represented by the main substance can also be used with the general formula X {O(AO)nR}m(X is the residue of a compound containing 2 to 8 hydrogen groups, AO is an oxyalkylene group with 2 to 18 carbon atoms, R is a hydrogen atom with 1 to 18 carbon atoms Hydrocarbons or acyl groups having 2 to 18 carbon atoms, n is 30 to 1000, m is 2 to 8), polyoxyalkylene derivatives, etc. represented by oxyalkylene groups of 60 mol% or more.

The amount of the shrinkage reducing agent used is preferably 1.3 to 3.8 parts per 100 parts of the binder. If it is less than 1.3 parts, the shrinkage reducing effect may be poor, and if it exceeds 3.8 parts, the strength development may be lowered.

Water reducing agent has the function of dispersing cement and absorbing air, and it is a substance that improves fluidity and increases strength. Concretely, a condensate of a melamine sulfonate, a condensate of a polycarboxylate, etc. are mentioned. In the present invention, at least a polycarboxylate-based water reducer is used in order to obtain predetermined fluidity. All these water reducers may be used in powder form, or a polycarboxylate-based water reducer may be used in combination with other water reducers.

It is preferable that the usage-amount of a polycarboxylate type water reducer is 0.13-0.3 part with respect to 100 parts of binders. If it is less than 0.13 parts, the predetermined fluidity may not be obtained, and if it exceeds 0.3 parts, the compressive strength may be lowered and material separation may occur. When a melamine sulfonate-based water reducer is used in combination, it is preferably 0.13 to 0.4 parts, and among them, about 0.25 parts is more preferable.

The foaming material used in the present invention is not particularly limited, but in order to obtain the initial expansion of the grout, it is a substance that generates gas after kneading with water, and the settlement phenomenon of the grout can be prevented by this action, so it can be realized. The purpose of integration with the structure. As specific examples, metal powders or peroxides can be mentioned, among which aluminum powder is preferred, but the surface of aluminum powder is easily oxidized and covered with an oxide film, which reduces reactivity, so it is preferred to use vegetable oil, mineral oil or Surface-treated aluminum powder such as stearic acid.

It is preferable that the usage-amount of a foaming substance is 0.0013-0.004 part with respect to 100 parts of binders. If it is less than 0.0013 parts, the amount of expansion may become very small, and if it exceeds 0.004 parts, the amount of expansion may become large and the strength may decrease.

The tackifier used in the present invention is used to adjust the viscosity of the mortar and is not particularly limited. Commercially available tackifiers can be used, such as methyl cellulose, carboxymethyl cellulose, polyvinyl alcohol, polyacrylic acid or Its sodium or calcium salt, and polyoxyethylene, etc.

The amount of the tackifier used is preferably 0.001 to 0.004 parts per 100 parts of the binder. If it is less than 0.001 part, bleeding may not be effectively prevented in some cases, and if it exceeds 0.004 part, fluidity may be reduced.

As the fine aggregate used in the present invention, a heavy aggregate having a density of 3.0 g/cm ³ or more, such as ferrochrome slag, is used. Preferably, the maximum particle diameter thereof is 5.0 mm or less.

It is preferable that the usage-amount of a fine aggregate is 100-200 parts with respect to 100 parts of binders. If it is less than 100 parts, the amount of shrinkage may increase, and if it exceeds 200 parts, the strength or fluidity may decrease.

In the present invention, in addition to the above-mentioned components, antifoaming agents, mineral clays such as bentonite, and anion exchangers such as aluminum carbonate can be used within the range that does not substantially impair the purpose of the present invention.

In the present invention, the cement mortar composition for grouting made of the above materials and water are kneaded and mixed to prepare grout.

The water for kneading is not particularly limited, but is preferably 31 to 36 parts per 100 parts of the binder. Outside this range, fluidity may be poor or material separation may occur, resulting in reduced strength development.

The mixing method of each material in the present invention is not particularly limited, and various materials may be mixed during construction, or a part or all of them may be mixed in advance.

As a mixing device, any existing one can be used. For example, inclined mixers, homogenizers, Henschel mixers, V-type mixers, and Nauta mixers.

The following examples are given to further describe the present invention, but the present invention is not limited to these examples.

Example 1

100 parts of binding materials contain the fast curing agent shown in table 1 (the amount of cement is to subtract the amount of fast curing agent from 85 parts), 10 parts of pozzolan micropowder, 2.5 parts of expansive material and 2.5 parts of micropowder cement, Then, 0.75 parts of setting retardant, 2.5 parts of shrinkage reducing agent, 0.25 parts of melamine sulfonate-based water-reducer, 0.2 parts of polycarboxylate-based water-reducer, 0.0025 parts of Foam material, 0.003 parts of tackifier and 150 parts of fine aggregate are used to make cement mortar composition for grouting, and then mixed with 34 parts of water with a high-speed manual mixer to make grouting, and measure its fluidity, Bleeding rate, volume expansion rate and compressive strength. The results are summarized in Table 1.

Materials used:

Cement: Ordinary Portland cement, density 3.15g/cm ³ , commercially available

Fast curing agent: Calcium aluminum silicate glass/anhydrite

1/1 (mass ratio) density 2.94g/cm ³

Pozzolan fine powder: silica fume derived from zirconia (commercially available)

Expansive material: Calcium sulfoaluminate series

Micro-powder cement: crushed ordinary Portland cement, graded product, average particle size 10μm

Coagulation delay agent: citric acid (anhydrous) 25%; calcium carbonate 75%

Shrinkage reducing agent: Polyethylene glycol-based shrinkage reducing agent, commercially available

Water-reducing agent: A melamine sulfonate-based water-reducing agent, commercially available

        B polysulfonate-based water reducer, commercially available

Foaming material: metal aluminum powder, commercially available

Thickener: Methylcellulose-based thickener, commercially available

Fine aggregate: ferrochrome slag, density 3.20g/cm ³ , 4mm or less

test methods:

Fluidity: Measure the flow-down value of the J ₁₄ funnel according to the standard specification book (JSCE-F541-1999) of the Civil Engineering Society (JSCE-F541-1999) "Fluidity Test Method for Filling and Grouting".

Bleeding rate: Bleeding is measured according to the standard prescription book (JSCE-F542-1999) of the Civil Engineering Society (JSCE-F542-1999) "Test method for bleeding rate and expansion rate of filling grouting".

Length change: According to the standard specification book of the Civil Engineering Society (JSCE-F542-1999) "expansion test method by mortar of expansive material", in a constant temperature and humidity room at 20°C and 80% RH, pour the grout into the formwork, pour Measured after one day. Then, after aging in water for 7 days, it was measured after aging in a constant temperature and humidity room at 20° C. and 60% RH.

Volume expansion rate: According to the standard specification book (JISA-6202-1197) of the Civil Engineering Society (JISA-6202-1197) "Test method for bleeding rate and expansion rate of filling grouting", pour the grout into the mold in a constant temperature and humidity room at 20°C and 80% RH Shells, measured one day after pouring.

Compressive strength: according to the standard prescription book (JSCE-G541-1999) of the Civil Engineering Society (JSCE-G541-1999) "Test method for compressive strength of filling and grouting", in a constant temperature and humidity chamber at 20°C and 80% RH, pour the grout into the formwork, and measure 6 Strength after 1 hour (Table 1), and then aging in water at 20°C after one day to determine compressive strength at 28 days old.

Table 1

Test No. Fast curing agent (parts) Liquidity (seconds) Bleeding rate (%) Volume expansion rate (%) Compressive strength at 6 hours old (N/mm ² ) Remark 1-1 0 9.8 0.0 +0.47 - comparative example 1-2 9 9.2 0.0 +0.45 3.5 Example 1-3 12 8.5 0.0 +0.45 4.8 Example 1-4 15 7.8 0.0 +0.45 7.2 Example 1-5 18 7.4 0.0 +0.48 10.2 Example 1-6 twenty one 7.2 0.0 +0.49 14.2 Example 1-7 25 7.0 0.0 +0.50 16.5 Example

- can not be determined

It can be seen from Table 1 that the grouting of the examples containing the fast curing agent has good fluidity, no bleeding, low shrinkage and high compressive strength (test No.1-2 to 1-7). On the other hand, the grout of the comparative example which did not contain the quick curing agent had reduced strength development (Test No. 1-1).

Example 2

Except that 100 parts of the bonding material contained 18 parts of the fast curing agent and the pozzolan fine powder shown in Table 2, it was made into grout in the same way as in Example 1, and then measured. The results are summarized in Table 2.

Table 2

Test No. Volcanic ash fine powder (parts) Liquidity (seconds) Bleeding rate (%) Volume expansion rate (%) Compressive strength at 28 days old (N/mm ² ) Remark 2-1 0 0.05 +0.30 65.8 comparative example 2-2 5 9.8 0.0 +0.32 64.4 Example 1-5 10 7.4 0.0 +0.48 64.8 Example 2-3 15 6.2 0.0 +0.54 64.5 Example

- can not be determined

As can be seen from Table 2, the grouting of the embodiment containing pozzolanic powder has good fluidity, no bleeding, low shrinkage, and high compressive strength (test No.2-2, 1-5, 2-3 ). On the contrary, the grout of the comparative example which did not contain pozzolan fine powder decreased fluidity (test No. 2-1).

Example 3

Except that 100 parts of the bonding material contained 18 parts of the fast curing agent, and the setting retarder shown in Table 3 was added to 100 parts of the bonding material, the grouting was performed in the same manner as in Example 1, and then measured. The results are summarized in Table 3.

table 3

Test No. Coagulation retardant (parts) Liquidity (seconds) Bleeding rate (%) Coagulation time (minutes) Compressive strength at 6 hours old (N/mm ² ) Remark 3-1 0.37 7.8 0.0 30 16.2 Example 3-2 0.50 7.5 0.0 41 14.5 Example 3-3 0.63 7.8 0.0 55 14.2 Example 1-5 0.75 7.4 0.0 78 10.2 Example 3-4 0.88 7.2 0.0 115 8.4 Example

It can be seen from Table 3 that the grouting of the example with the addition of the coagulation retarder has good fluidity, no bleeding, proper coagulation time, and high compressive strength.

Example 4

Except that 100 parts of the bonding material contained 18 parts of the fast curing agent, and the shrinkage reducing agent shown in Table 4 was added to 100 parts of the bonding material, the grout was prepared in the same manner as in Example 1, and then measured. The results are summarized in Table 4.

Table 4

Test No. Shrinkage reducer (part) Liquidity (seconds) Bleeding rate (%) Length change rate (×10 ^-6 ) Volume expansion rate (%) Compressive strength at 28 days old (N/mm ² ) Remark 4-1 0 9.8 0.0 -200 +0.30 70.2 Example 4-2 1.3 9.2 0.0 -50 +0.32 69.4 Example 1-5 2.5 7.4 0.0 +30 +0.48 64.8 Example 4-3 3.8 6.2 0.0 +74 +0.54 60.5 Example

Length change rate (28-day value of material age)

Example 5

In addition to making 100 parts of the binding material contain 18 parts of the fast curing agent, and adding 0.25 parts of the melamine sulfonate-based water-reducing agent and the polycarboxylic acid-based water-reducing system shown in Table 5 to 100 parts of the binding material, the same as in the example 1 After the grouting is made in the same way, the measurement is carried out. The results are summarized in Table 5.

table 5

Test No. Superplasticizer (parts) Liquidity (seconds) Bleeding rate (%) Compressive strength at 28 days old (N/mm ² ) material separation Remark 5-1 0 - 0.0 66.3 none comparative example 5-2 0.13 9.4 0.0 64.9 none Example 5-3 0.15 8.6 0.0 65.4 none Example 1-5 0.20 7.4 0.0 64.8 none Example 5-4 0.25 6.9 0.0 63.9 none Example 5-5 0.30 6.2 0.0 65.4 none Example

Polycarboxylate water reducer (parts), - cannot be determined

It can be seen from Table 5 that the grouting of the examples added with polycarboxylate water reducer has good fluidity, no bleeding, and high compressive strength (test No.5-2 to 5-5, 1 -5). On the contrary, in the grouting of the comparative example in which the polycarboxylate-based water reducer was not added, fluidity decreased (test No. 5-1).

Example 6

Except that 100 parts of the bonding material contained 18 parts of the fast curing agent, and the foaming substance shown in Table 6 was added to 100 parts of the bonding material, the measurement was performed after grouting in the same manner as in Example 1. The results are summarized in Table 6.

Table 6

Test No. Foaming substance (part) Liquidity (seconds) Bleeding rate (%) Volume expansion rate (%) Compressive strength at 28 days old (N/mm ² ) Remark 6-1 0 7.6 0.0 -0.35 65.0 Example 6-2 0.0013 7.5 0.0 +0.11 65.1 Example 6-3 0.0019 7.6 0.0 +0.35 65.4 Example 1-5 0.0025 7.4 0.0 +0.48 64.8 Example 6-4 0.0033 7.7 0.0 +0.56 63.8 Example 6-5 0.0040 7.4 0.0 +0.69 62.6 Example

Example 7

Except that 100 parts of the bonding material contained 18 parts of the fast curing agent, and the tackifier shown in Table 7 was added to 100 parts of the bonding material, it was made into a grout in the same manner as in Example 1, and then measured. The results are summarized in Table 7.

Table 7

Test No. Tackifier Liquidity (seconds) Bleeding rate (%) Volume expansion rate (%) Compressive strength at 28 days old (N/mm ² ) Remark 7-1 0 5.2 0.08 +0.55 65.1 Example 7-2 0.001 6.5 0.03 +0.54 64.9 Example 1-5 0.003 7.4 0.0 +0.48 64.8 Example 7-3 0.004 9.6 0.0 +0.30 62.3 Example

Example 8

Except having contained 18 parts of fast curing agent in 100 parts of binders, and added the fine aggregate shown in Table 8 with respect to 100 parts of binders, it measured after making grout in the same way as Example 1. The results are summarized in Table 8.

Table 8

Test No. Fine aggregate (parts) Liquidity (seconds) Bleeding rate (%) Volume expansion rate (%) Compressive strength at 28 days old (N/mm ² ) Remark 8-1 100 9.7 0.0 +0.53 77.0 Example 1-5 150 7.4 0.0 +0.48 64.8 Example 8-2 175 8.5 0.0 +0.31 59.8 Example 8-3 200 9.5 0.0 +0.35 55.4 Example

Example 9

Except that 100 parts of the bonding material contained 18 parts of the fast curing agent, and water shown in Table 9 was added to 100 parts of the bonding material, the grout was prepared in the same manner as in Example 1, and then measured. The results are summarized in Table 9.

Table 9

Test No. water (parts) Liquidity (seconds) Bleeding rate (%) Volume expansion rate (%) Compressive strength at 28 days old (N/mm ² ) Remark 9-1 30 12.6 0.0 +0.33 75.5 Example 9-2 32 8.8 0.0 +0.35 70.9 Example 1-5 34 7.4 0.0 +0.48 64.8 Example 9-3 36 6.3 0.0 +0.52 63.7 Example 9-4 38 5.1 0.0 +0.55 55.9 Example

Example 10

The grout mixed in Test No. 1-5 was subjected to an impact resistance test by dropping a steel ball and an abrasion test by a cone abrasion tester. As a comparison, in the mixing of test No.1-5, the grouting with lime sand (density 2.60g/cm ³ ) instead of heavy aggregate and the grouting of other companies using iron powder aggregate were tested. The results are shown in Table 10.

test methods

Impact resistance test: test body size 150×150×50mm

         Steel ball size Φ100mm×4kg

                                     

Abrasion resistance test: cone abrasion test (weight reduction method)

                                       

Abrasion wheel H-22

                                                             

Table 10

Test No. Aggregate Liquidity (seconds) Compressive strength at 28 days old (N/mm ² ) Impact resistance drop times (times) Abrasion resistance Abrasion (g) Remark 1-5 Ferrochrome slag 7.4 64.8 160 2.7 Example 10-1 lime sand 8.0 60.7 70 5.8 comparative example 10-2 Iron powder 6.4 62.7 120 2.9 comparative example

It can be seen from Table 10 that the grout of the examples containing heavy aggregate has good fluidity, high compressive strength, and excellent impact resistance and wear resistance (test No.1-5). On the contrary, the grout of the comparative example containing lime sand without heavy aggregate had low compressive strength, and was poor in impact resistance and wear resistance (Test No. 10-1). In addition, the grout of the present invention has more excellent properties than the commercially available product (No. 10-2) containing heavy aggregate.

Industrial use

The cement mortar formed by using the cement mortar composition for grouting of the present invention can obtain good fluidity, high strength, high durability and low shrinkage as described above, and can be used in civil engineering and construction, especially in mechanical foundations, etc. used in structures.

Claims (11)

1. grouting cement mortar composition, it forms by containing in conjunction with material, the retarding agent that condenses, water reducer and fine aggregate, it is characterized in that, described quick curing agent and the volcanic ash micropowder that forms by cement, calcium aluminium silicate glass and gypsum that contain in conjunction with material, described water reducer contains the polycarboxylate based water reducer at least, and described fine aggregate is density 3.0g/cm ³Above heavy aggregate.

2. grouting cement mortar composition according to claim 1, wherein, described volcanic ash micropowder is that dioxide-containing silica is more than 90% and the siliceous micropowder of hydrogen ion concentration in acidic region.

3. grouting cement mortar composition according to claim 1 and 2, wherein, described cement contains by fractionated micropowder cement.

4. according to each described grouting cement mortar composition in the claim 1～3, wherein, describedly further contain the expansion material in conjunction with material.

5. grouting cement mortar composition according to claim 4, wherein, described expansion material is that the Bo Shi value is 4000cm ²The above calcium sulphoaluminate of/g is the expansion material.

6. according to each described grouting cement mortar composition in the claim 1～5, wherein, described water reducer further contains the melamine sulfonate based water reducer.

7. according to each described grouting cement mortar composition in the claim 1～6, wherein, further contain economization agent.

8. according to each described grouting cement mortar composition in the claim 1～7, wherein, further contain foaming substance.

9. according to each described grouting cement mortar composition in the claim 1～8, wherein, further contain tackifier.

10. a slip casting is characterized in that, forms with cement mortar composition and water by each described grouting in the mixing claim 1～9.

11. slip casting according to claim 10, wherein, with respect to 100 parts in conjunction with material, water is 31～36 parts.