CN101555106B - Composite cementitious material and ground self-leveling mortar using same - Google Patents

Composite cementitious material and ground self-leveling mortar using same Download PDF

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Publication number
CN101555106B
CN101555106B CN200910038452.8A CN200910038452A CN101555106B CN 101555106 B CN101555106 B CN 101555106B CN 200910038452 A CN200910038452 A CN 200910038452A CN 101555106 B CN101555106 B CN 101555106B
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China
Prior art keywords
cement
self
leveling
plaster
mortar
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CN200910038452.8A
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Chinese (zh)
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CN101555106A (en
CN101555106K1 (en
Inventor
姜伟基
张铬
洪永顺
梁洪
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广东龙湖科技股份有限公司
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Priority to CN200910038452.8A priority Critical patent/CN101555106B/en
Publication of CN101555106A publication Critical patent/CN101555106A/en
Publication of CN101555106K1 publication Critical patent/CN101555106K1/zh
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C04B28/06Aluminous cements

Abstract

The invention provides a ground self-leveling mortar comprising gelatinization materials, fine sand and an additive. The gelatinization materials comprise sulphate aluminium cement, silicate cement and plaster. The self-leveling mortar comprises the components by weight percentage of: 30% of sulphate aluminium cement, 12.6% of silicate cement, 46.15% of fine sand, and 4.75% of additive. The plaster is a natural hard plaster or reverse 8-type hymihydrate plaster. The additive comprises: redisperse emulsion powder, early strength agent, a retarder, a super-plasticizer, a defoamer and a stabilizer. The ground self-leveling mortar uses the sulphate aluminium cement to replace aluminate cement to be combined with the silicate cement and the plaster, so as to solve the problems that the aluminate cement is high in price and difficult to purchase, and overcome the contradiction between shrinkage and expansion, thus avoiding the self-leveling floor hollowing and cracking and ensuring the bonding strength, folding and compressingresistance strength as well as wearing resistance to reach the optimized level.

Description

A kind of composite gelled material and adopt the ground self-leveling mortar of this composite gelled material
Technical field
The present invention relates to a kind of gelling material, relate in particular to a kind of composite gelled material taking cement, gypsum as agglutinate.The invention still further relates to a kind of gravity flowing levelling mortar, more specifically relate to a kind of ground self-leveling mortar that adopts above-mentioned composite gelled material.
Background technology
Gelling material is under physics, chemical action, can become firm Shi Zhuanti from slurry, and the cementing unclassified stores of energy, makes the material of the composite solid of certain physical strength.Silicate cement is topmost building latex material in the world today, and its grog is taking tricalcium silicate (C3S) mineral as main, and silicate cement has advantages of that material storage is abundant, production cost is lower, mature production technology.But silicate cement is long time of coagulation, early strength is low, shrinking percentage is large, poor durability, require for preparing those extraordinary mortar that set time is short, early strength is high, shrinking percentage is low, as gravity flowing levelling mortar, adopting simple silicate cement is the performance requriements that cannot reach each side as gelling material.
Self-leveling is a kind of ground construction technology, it is the fluent meterial that many materials mix with water, pour into behind ground, this material can be taken advantage of a situation mobile according to being uneven of ground, Automatic Levelling is carried out in ground, and dry very soon, the ground after solidifying can form smooth, smooth, seamless new basic unit.Ground self-leveling mortar is that 20 century 70s grow up, it by gelling material, fine aggregate and additive etc. mix, be one add water at the scene stir after be that spendable single component is high-strength, quick-set.Ground self-leveling mortar can be uneven substrate suitable, smooth, a smooth and firm place mat substrate is provided, to set up various flooring materials, as carpet, timber floor, PVC, ceramic tile etc., become bottom Self-leveling, also can directly use as ground load layer, become surfacing self-leveling floor.Because ground self-leveling mortar has extraordinary mobility, Self-leveling ability and from smooth ability, even for large-area ground, also can rapidly and efficiently obtain high-flatness terrace, thereby be widely used in the one leveling of the large area spaces such as industrial premises, workshop, storage, business sales field, exhibition room, gymnasium or hospital; In addition, ground self-leveling mortar also has rapid solidification, rapid drying and low-shrinkage, high compressive strength and the good characteristic such as wear-resisting, makes it on the high smooth basal plane as veneer materials such as epoxide terrace, polyurethane floor, PVC coiled material, sheet material, rubber floor covering, solid wooden floor board, adamantine plates, also obtain applying more and more widely.
Ground self-leveling mortar, from the composition of gelling material, can be divided into " cement based " self-leveling material and " gypsum base " self-leveling material.Domestic cement-based floor self-leveling mortar at present, its gelling material is taking aluminate cement, silicate cement as main, and aluminate cement only has minority area to have production in the whole nation, so price is higher and bad purchase, in addition, may be because very unreasonable, the domestic cement-based floor self-leveling mortar of formulating of recipe there will be the problems such as contraction, hollowing, cracking, cohesive strength are not high, bending and compressive strength is not high, wear resistance is bad through often after construction; In addition, the bad or rough problem of degree of mobilization is also comparatively obvious when construction.
In the evolution of silicate cement based cementitious material, there is silicate cement and the complex cement of multiple modification, and the compound focus that also becomes Recent study between different series cement.Nineteen seventies, aluminosulfate cement has been invented by China, contains a large amount of calcium sulphoaluminate (C in its grog 4a 3) mineral, this cement has early strong, high-strength, low basicity and the low feature of production energy consumption; But much experiment showed, when sulphur aluminic acid cement and silicate cement mix, complex cement will occur in very large ratio range and sharply accelerate time of coagulation, even occur anxious solidifying, the problem that causes early strength obviously to reduce, thereby generally, these two kinds of cement must not mix use.Inventor's process repetition test, but finds to mix the appropriate material such as silicate cement and gypsum when aluminosulfate cement, the composite gelled material system of can make soon firmly, morning is strong, high-strength and contract with dry rate is low, thereby the production cost of reduction characteristic cement.
Summary of the invention
The object of this invention is to provide that a kind of starting material source is wide, cost is lower and there is early strong, high-strength and composite gelled material that shrinking percentage is low.
Another object of the present invention is to provide a kind of ground self-leveling mortar that adopts above-mentioned gelling material, and this mortar has excellent degree of mobilization, shrinking percentage, ultimate compression strength, tensile bond strength and wear resistance.
For realizing above object, composite gelled material of the present invention comprises aluminosulfate cement, silicate cement and gypsum, and aluminosulfate cement, silicate cement, the gypsum weight percent in composite gelled material is: aluminosulfate cement 50-80%, silicate cement 10-30%, gypsum 5-30%.
Above-mentioned aluminosulfate cement, silicate cement, the gypsum weight percent in composite gelled material is preferably: aluminosulfate cement 55-70%, silicate cement 12-26, gypsum 13-30%.
The silicate cement of above-mentioned silicate cement preferred intensity 42.5R, the preferred fineness of gypsum is for being more than or equal to 200 object natural anhydrites or ∝ type semi-hydrated gypsum.
Composite gelled material of the present invention can react after utilizing aluminosulfate cement, silicate cement and gypsum to mix under certain ratio and generate the ettringite with expansion characteristics, make it possess fast solidifying, the fast hard and low characteristic of shrinking percentage, thereby can be used for preparation with the reduction of erection time, be delivered for use fast for the various fast rigid mortar of object, taking obtain good repairing performance as the various mending mortars of object, taking soon solidifying, early strong, low-shrinkage, as the gravity flowing levelling mortar of object, also can be used for as water-proof plugging material and wall floor tile stickup cement-based mortar.
The present invention also provides a kind of ground self-leveling mortar, this ground self-leveling mortar comprises gelling material, spun yarn and additive, it is characterized in that: described gelling material is made up of aluminosulfate cement, silicate cement and gypsum, the weight percent of each component in ground self-leveling is aluminosulfate cement 15-35%, silicate cement 4-13%, gypsum 4.5-15%, fine sand 45-70%, additive 2.5-7%.
Above-mentioned additive comprises redispersable latex powder, retardant, superplasticizer, defoamer and stablizer, and the weight percent of each additive in ground self-leveling mortar is: redispersable latex powder 2-5%, retardant 0.03-0.08%, superplasticizer 0.1-0.7%, defoamer 0.1-0.2%, stablizer 0.06-0.15%.
For the better early stage intensity of gravity flowing levelling mortar that improves, above-mentioned additive also comprises hardening accelerator, and the weight percent of hardening accelerator in ground self-leveling mortar is 0.1-0.2%.
In order to increase the viscosity of ground self-leveling mortar, reduce plasticity and chemical shrinkage, the contradiction between degree of mobilization and the segregation of solution ground self-leveling mortar, the preferred casein food grade of above-mentioned superplasticizer, the preferred hydroxyethyl ether cellulose of stablizer.
The preferred poly carboxylic acid ether of above-mentioned superplasticizer high efficiency water reducing agent, stablizer preferred anionic type high-molecular copolymer.
Preferred mineral oil/the polydiolefin of above-mentioned defoamer defoamer.
In order to make surfacing self-leveling floor have beautiful color, above-mentioned additive also includes pigment, and the addition of pigment is the 0.5-3.5% of ground self-leveling mortar weight.
Above-mentioned fine sand preferred 30-150 object purity quartzite or river sand.
Ground self-leveling mortar of the present invention, has advantages of as follows:
1, the present invention adopts the wide aluminosulfate cement in source to replace aluminate cement and silicate cement and the compound gelling material of doing gravity flowing levelling mortar of gypsum, solve the problem that aluminate cement valency is high, be difficult for purchase, retained the characteristic that gravity flowing levelling mortar is fast firmly, morning is strong, high-strength and shrinking percentage is low simultaneously.
2, the present invention uses uniform design to carry out optimization experiment to aluminosulfate cement, silicate cement and gypsum, find out the optimization of ternary system, solve and shunk the contradiction between expansion, thereby avoid hollowing, cracking, made that cohesive strength, bending and compressive strength, wear resistance are even has reached optimized level.
3, the present invention utilizes the non-Newton fluid characteristic of superplasticizer and newton's body fluid characteristics of stablizer to combine, while having solved construction, fluidity loss is large, rough smooth, the dirt of having emanated in construction rear surface, sedimentation and inhomogeneous problem, make Self-leveling have extraordinary Self-leveling ability, self-healing capability and from smooth ability.
Embodiment
One, composite gelled material
The present invention adopts the thought and method of homogeneous design, set aluminosulfate cement proportion and be greater than 40%, gypsum addition 0-30%, silicate cement volume 0-30% carries out optimization experiment, determine optimum mix, when making composite gelled material reach strong, high-strength, fast hard and minimum shrinkage early, reduce the cost of aluminosulfate cement.Silicate cement preferred intensity is the silicate cement of 42.5R, the anhydrite of preferred fineness >=200 of gypsum.
Table 1 raw material ratio design and functions test result
Table 2 raw material ratio design and change the performance test results
Experimental data by table 1, table 2 can be found out, when the amount of aluminosulfate cement be 50-80%, silicate cement measure 10-30%, gypsum measure 5-30%10 time, time of coagulation, ultimate compression strength, folding strength and shrinkage ratio are better, but 10,13, No. 14 gelling material of obtaining of formula, its solidifying, resistance to compression soon, anti-folding and shrinking percentage all can reach desirable requirement, therefore determine that the best proportioning of aluminosulfate cement, silicate cement and gypsum is aluminosulfate cement 55-70%, silicate cement 12-26, gypsum 13-30%.
Two, ground self-leveling mortar
Embodiment 1
1, surfacing self-leveling floor formula
2, performance test
The surfacing self-leveling floor performance of gained is: degree of mobilization 142mm, operable time is greater than 40min, ultimate compression strength 43.5MPa, shrinking percentage 0.034%, tensile bond strength 1.49MPa, wear resistance 0.38g.
Embodiment 2
1, bottom Self-leveling formula
2, performance test
Mix by above-mentioned weight percent is reinforced, add water and stir rear construction by water cement ratio 26%, the bottom Self-leveling performance of gained is: degree of mobilization 153mm, operable time is greater than 45min, ultimate compression strength 37.5MPa, shrinking percentage 0.085%, tensile bond strength 1.1MPa, wear resistance 0.46g.
Embodiment 3
1, colorful surface layer Self-leveling formula
2, performance test
Mix by above-mentioned weight percent is reinforced, add water and stir rear construction by water cement ratio 23%, the colorful surface layer Self-leveling performance of gained is: degree of mobilization 137mm, operable time is greater than 40min, ultimate compression strength 39.5MPa, shrinking percentage 0.023%, tensile bond strength 1.54MPa, wear resistance 0.32g.
Three, contrast experiment
1, stablizer contrast experiment
By following formula, use respectively German tyloseH300P2 stablizer (optimum add amount 0.08%) and German BASF 3003F stablizer (optimum add amount 0.2%), carry out parallel contrast experiment:
By finding after above-mentioned formula construction, add the Self-leveling of German tyloseH300P2, surrounding produces white water mark, has certain segregation, and while inclination, segregation phenomenon is more obvious, can cause Self-leveling inhomogeneous in practice of construction, and dirt is played on hollowing, surface, cohesive strength is poor, the problem such as wear no resistance, but also can cause the slow setting of gravity flowing levelling mortar, its 24 hours ultimate compression strength only have 8.7MPa.And add the Self-leveling of German BASF 3003F, and uniformity, has good resistance to settling, and surface smoothing, and 3003F can not cause slow setting to mortar, and its 24 hours ultimate compression strength can reach 18.5MPa.
2, the self-healing performance test of casein food grade
The formula of use-case 2, respectively 8,15,30,45, when 60min with perching knife in standardized road, Self-leveling surface, can see and use casein food grade as superplasticizer, can in the time of 45min, still there is good self-healing performance, this is in practice of construction, healing automatically in the place that can make service tool streak, thereby reaches smooth surface.
Can be found out by above experiment, in the time that superplasticizer adopts poly carboxylic acid ether high efficiency water reducing agent, stablizer adopts German BASF 3003F (anionic high-molecular copolymer) can solve hollowing, dirt is played on surface, and cohesive strength is poor, and the problem such as wear no resistance.And in the time that superplasticizer adopts casein food grade, stablizer adopts German tyloseH300P2 (hydroxyethyl ether cellulose), gravity flow flat bed also has good self-healing capability.

Claims (3)

1. a ground self-leveling mortar, is made up of following each component and weight:
2. a ground self-leveling mortar, is made up of following each component and weight:
3. a ground self-leveling mortar, is made up of following each component and weight:
CN200910038452.8A 2009-04-03 2009-04-03 Composite cementitious material and ground self-leveling mortar using same CN101555106B (en)

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