CN105948665A - Early-strength, low-shrinkage and high-toughness cement-based engineering material and preparation method thereof - Google Patents

Early-strength, low-shrinkage and high-toughness cement-based engineering material and preparation method thereof Download PDF

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CN105948665A
CN105948665A CN201610288627.0A CN201610288627A CN105948665A CN 105948665 A CN105948665 A CN 105948665A CN 201610288627 A CN201610288627 A CN 201610288627A CN 105948665 A CN105948665 A CN 105948665A
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cement
engineering material
based engineering
water
high tenacity
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CN105948665B (en
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黄遵鹏
丁庆军
徐波
付军
何良玉
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Wuhan University of Technology WUT
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Wuhan University of Technology WUT
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions 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
    • C04B28/06—Aluminous cements
    • C04B28/065—Calcium aluminosulfate cements, e.g. cements hydrating into ettringite
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00—Adapting or protecting infrastructure or their operation
    • Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

Abstract

The invention belongs to the field of building materials, and discloses an early-strength, low-shrinkage and high-toughness cement-based engineering material. The cement-based engineering material is prepared from 460-500kg/m<3> of sulphoaluminate cement, 50-70kg/m<3> of ordinary portland cement, 50-70kg/m<3> of silica fume, 40-60kg/m<3> of steel fibers, 8-10kg/m<3> of polyvinyl alcohol fibers, 200-220kg/m<3> of water, 7.0-7.4kg/m<3> of a water reducer, 0.2-0.22kg/m<3> of an early strength agent, 1.7-1.9kg/m<3> of a set retarder and 1180-1220kg/m<3> of river sands. The cement-based engineering material prepared in the invention has the advantages of good working performance, high early strength, greatly increased late strength, excellent mechanical performances and volume stability, high toughness, good mechanical performances and durability, and large practical application values.

Description

The strongest a kind of lower shrinkage high tenacity cement based engineering material and preparation method thereof
Technical field
The invention belongs to building material field, be specifically related to the strongest a kind of lower shrinkage high tenacity cement based engineering material and preparation thereof Method.
Background technology
Cement based engineering material (engineered cementitious composite, ECC) is excellent based on microphysics mechanics principle Change a kind of Novel engineering cement-base composite material of design, by the Li Victor C of Univ Michigan-Ann Arbor USA in 90 years 20th century In generation, takes the lead in putting forward its design concept.It adds special allocating technology one of with special organic synthetic fibers as main material Make, have and than traditional more preferable tension of cement-based material, wear-resisting, toughness, acid and alkali-resistance, compactness, shock resistance etc. be Row high-quality characteristic, has obtained relatively broad in the engineerings such as Concrete Protective Cover, floorings reparation, non-telescope floorings Application.
But common cement based engineering material there is also its own shortcomings: 1) self do not contain coarse aggregate, cement slurry content is big, Shrink big, easily cause repair layer and basic unit's unsticking and cracking；2) PVA fibers content is high, and viscosity is big, is difficult to construction；3) become This height.
These shortcomings limit its large-scale application quickly repairing field at xoncrete structure.
Summary of the invention
It is an object of the invention to provide the strongest a kind of lower shrinkage high tenacity cement based engineering material and preparation method thereof, prepare The favorable working performance of cement based engineering material, early strength are high, later strength increases big, have good mechanical property and resistance to Performance for a long time.
For achieving the above object, the technical solution used in the present invention is: the strongest a kind of lower shrinkage high tenacity cement based engineering material, It is characterized in that it by comprise sulphate aluminium cement, Portland cement, silicon ash, steel fibre, vinal, water, Water reducer, early strength agent, retarder and fluvial sand raw material are prepared from, and the content of each raw material is: sulphate aluminium cement 460～500kg/m3, Portland cement 50～70kg/m3, silicon ash 50～70kg/m3, steel fibre 40～60kg/m3, poly-second Enol fiber 8～10kg/m3, water 200～220kg/m3, water reducer 7.0～7.4kg/m3, early strength agent 0.2～0.22kg/m3, slow setting Agent 1.7～1.9kg/m3, fluvial sand 1180～1220kg/m3。
According to such scheme, described sulphate aluminium cement is R.SAC42.5 sulphate aluminium cement, specific surface area >=400m2/ kg, 0.08mm tails over≤10.0%, 0.2%≤28d free swelling rate≤0.4%.
According to such scheme, described Portland cement (i.e. portland cement) is PO42.5 portland cement, specific surface Long-pending >=300m2/kg。
According to such scheme, described silicon ash is SILICA FUME, specific surface area >=20000m2/ kg, activity index >=90%.
According to such scheme, described steel fibre is copper facing short silk steel fibre, diameter 0.2mm, length 10mm, tensile strength >= 1800MPa, elastic modelling quantity >=200MPa.
According to such scheme, a length of 12mm of described vinal, draw ratio 316, fracture strength >=1600MPa, Elastic modelling quantity >=28GPa.
According to such scheme, described water reducer is ultra-dispersed viscosity reduction polycarboxylic acid series high efficiency water reducing agent, and molecular formula is (-CH2CR1COOM-)x{CH2CR1COO-[(CH2CH2O)n]-R2}y, molecular weight 15000～20000, x=25～40, Y=30～45, n=10～15.
According to such scheme, described early strength agent is lithium carbonate, technical grade, content >=98% (quality).
According to such scheme, described retarder is boric acid, technical grade, content >=98% (quality).
According to such scheme, described fluvial sand clay content is 0% (quality), and particle diameter is not more than 1.18mm, modulus of fineness≤1.7, Apparent density≤2700kg/m3。
Above-mentioned a kind of morning strong lower shrinkage high tenacity cement based engineering material preparation method, it is characterised in that comprise the following steps:
1) by the content of each raw material it is: sulphate aluminium cement 460～500kg/m3, Portland cement 50～70kg/m3, silicon Ash 50～70kg/m3, steel fibre 40～60kg/m3, vinal 8～10kg/m3, water 200～220kg/m3, water reducer 7.0～7.4kg/m3, early strength agent 0.2～0.22kg/m3, retarder 1.7～1.9kg/m3, fluvial sand 1180～1220kg/m3, weigh former Material；
2) take part water and be heated into warm water (temperature of described warm water is 45～60 DEG C), respectively by early strength agent (lithium carbonate) and Retarder (boric acid) dissolves in warm water that { consumption of water enough dissolves just, at total Water (water 200～220kg/m3Within), It is not strict with, obtain Lithium carbonate solution and boric acid solution；
3) carry out mixing dry mixing 1min by sulphate aluminium cement, Portland cement, silicon ash and fluvial sand, obtain compound； In gained compound, add remaining water (i.e. deduction dissolves lithium carbonate and the water of boric acid), water reducer, stir 2-3min, Prepare mixture slurry；
4) steel fibre and vinal being homogeneously added in mixture slurry respectively, 3min is equal to assorted fibre in stirring It is dispersed in mixture slurry evenly, obtains fibrous mixture slurry；
5) Lithium carbonate solution and boric acid solution are added step 4) in the fibrous mixture slurry of gained, stir 1min；
6) by 5) gained slurry pours die for molding into, the demoulding after standing 4～5h, and carry out maintenance, obtain the strongest lower shrinkage High tenacity cement based engineering material.
The principle of the present invention is: selecting at present generally portland cement is that Binder Materials prepares cement based engineering material, but silicon Acid salt cement hydration heat amount is big, shrinks the biggest, thus dry-shrinkage deformed greatly with its ECC prepared for glue material, is not suitable for using Make patching material.And although sulphate aluminium cement has the strongest, the feature of hydrated product ettringite expansion compensation contraction, but Later strength increases little, is also unsuitable for preparing cement based engineering material separately as glue material.Silicon ash has as mineral admixture Stronger pozzolanic activity and Micro-aggregate filling effect, it is possible to improve the microstructure after gelling slurry hardening, significantly improve power Learn performance and endurance quality.Therefore combine sulphate aluminium cement early the strongest, freeze proof, anti-permeability performance is good, the feature of microdilatancy and silicon The compounding Binder Materials of making of characteristic employing portland cement, sulphate aluminium cement and silicon ash that the acid salt cement later stage is high-strength, thus real Superposition in existing performance is with complementary.The reaction equation of Binder Materials is as follows:
C2S+2H=C-S-H (gel)+CH (1-2)
C3A+CH+12H=C4A·H13 (1-3)
C3S+3H=C-S-H (gel)+2CH (1-4)
AH3(gel)+3CH+3CSH2=C3A·3CSH32 (1-5)
SiO2+ CH=C-S-H (1-6)
And by compounding slow setting accelerating component, use the regulation of ultra-dispersed viscosity reduction high efficiency water reducing agent to improve the work of cement based engineering material Make performance and early mechanics characteristics, mix low-elasticity-modulus steel fibre and high-elastic modulus polyvinyl alcohol fibre, play what activeness and quietness reduced Effect, the strongest lower shrinkage high tenacity cement based engineering material of design preparation.
Early-strength lower shrinkage high tenacity cement based engineering material utilizes sulphate aluminium cement hydrated product microdilatancy characteristic, takes For part Portland cement, inside mix reactive mineral components silicon ash, compounding slow setting accelerating component, apply ultra-dispersed viscosity reduction efficient Water reducer, hybrid fiber, vinal are prepared from.The cement based engineering material favorable working performance, the early stage that prepare are strong Degree is high, later strength increases big, and mechanical property, volume stability are excellent, and toughness is high.The present invention significantly improves cement Base engineering material shrinks and easily causes greatly repair layer and basic unit's unsticking and cracking, viscosity are difficult to greatly the shortcoming constructed, cost is high, has Important actual application value.
Compared with prior art, the invention has the beneficial effects as follows:
(1) use sulphate aluminium cement to replace part portland cement, play the advantage that the two performance superposition is complementary, utilize sulfur Aluminate cement hydrated product ettringite early strong, the feature of microdilatancy is also coagulated component by compounding tune and is realized cement based engineering material Morning is strong, lower shrinkage performance, strengthen the durability of interfacial adhesion, can be applied in quick reparation field, widen water The range of application of mud base engineering material；
(2) use low-cost low-elasticity-modulus steel fibre to replace the high-elastic modulus polyvinyl alcohol fibre that part is expensive, both played mixed The performance effect of miscellaneous fiber and dimensional effect, comprehensive raising activeness and quietness Reduce shrinkage effect, significantly reduce again the cost of raw material；
(3) preparation technology is simple, uses thin fluvial sand to replace quartz sand, reduces cost；Use the efficient diminishing of ultra-dispersed viscosity reduction Agent disperse cement particles, reduces the cohesiveness of slurry, prepared cement based engineering material favorable working performance, and early strength is high, And there is good mechanical property and endurance quality, apply in floorings are quickly repaired, Rapid-Repair can be realized, quickly lead to Car.
Detailed description of the invention
In order to be more fully understood that the present invention, it is further elucidated with present disclosure below in conjunction with embodiment, but present disclosure is not only It is confined to the following examples.
In following embodiment: described sulphate aluminium cement is R.SAC42.5 sulphate aluminium cement, specific surface area >=400m2/ kg, 0.08mm tails over≤10.0%, 0.2%≤28d free swelling rate≤0.4%.Described Portland cement (i.e. silicate Cement) it is PO42.5 portland cement, specific surface area >=300m2/kg.Described silicon ash is SILICA FUME, specific surface area >= 20000m2/ kg, activity index >=90%.Described steel fibre is copper facing short silk steel fibre, diameter 0.2mm, length 10mm, Tensile strength >=1800MPa, elastic modelling quantity >=200MPa.The a length of 12mm of described vinal, draw ratio 316, Fracture strength >=1600MPa, elastic modelling quantity >=28GPa.Described water reducer is ultra-dispersed viscosity reduction polycarboxylic acid series high efficiency water reducing agent. Described early strength agent is lithium carbonate, technical grade, content >=98% (quality).Described retarder is boric acid, technical grade, content >= 98% (quality).Described fluvial sand clay content is 0% (quality), and particle diameter is not more than 1.18mm, modulus of fineness≤1.7, table See density≤2700kg/m3。
Embodiment 1:
The strongest a kind of lower shrinkage high tenacity cement based engineering material, the weight proportion (kg/m of each raw material3) it is: water 210, sulfur Aluminate cement 480, Portland cement 60, silicon ash 60, steel fibre 50, vinal 10, water reducer 7.2, Early strength agent 0.21, retarder 1.8, fluvial sand 1200.
Above-mentioned a kind of morning strong lower shrinkage high tenacity cement based engineering material preparation method, comprise the following steps:
1) raw material is weighed according to above-mentioned raw materials proportioning；
2) take part water and be heated into warm water (temperature of described warm water is 45～60 DEG C), respectively by early strength agent (lithium carbonate) and Retarder (boric acid) dissolves in warm water, obtains Lithium carbonate solution and boric acid solution；
3) carry out mixing dry mixing 1min by sulphate aluminium cement, Portland cement, silicon ash and fluvial sand, obtain compound； In gained compound, add remaining water (i.e. deduction dissolves lithium carbonate and the water of boric acid), water reducer, stir 2-3min, Prepare mixture slurry；
4) steel fibre and vinal being homogeneously added in mixture slurry respectively, 3min is equal to assorted fibre in stirring It is dispersed in mixture slurry evenly, obtains fibrous mixture slurry；
5) Lithium carbonate solution and boric acid solution are added step 4) in the fibrous mixture slurry of gained, stir 1min；
6) by 5) gained slurry pours die for molding into, floating, cover film, the demoulding after standing 4～5h, carries out maintenance, Obtain the strongest lower shrinkage high tenacity cement based engineering material.
Prepared by the present embodiment morning, the match ratio of strong lower shrinkage high tenacity cement based engineering material was shown in Table 1, service behaviour, mechanical property 2 and table 3 can be shown in Table with endurance quality parameter.
Embodiment 2:
The strongest a kind of lower shrinkage high tenacity cement based engineering material, the weight proportion (kg/m of each raw material3) it is: water 220, sulfur Aluminate cement 470, Portland cement 70, silicon ash 60, steel fibre 60, vinal 8, water reducer 7, Early strength agent 0.2, retarder 1.7, fluvial sand 1200.
Above-mentioned a kind of morning strong lower shrinkage high tenacity cement based engineering material preparation method, comprise the following steps:
1) raw material is weighed according to above-mentioned raw materials proportioning；
2) take part water and be heated into warm water (temperature of described warm water is 45～60 DEG C), respectively by early strength agent (lithium carbonate) and Retarder (boric acid) dissolves in warm water, obtains Lithium carbonate solution and boric acid solution；
3) carry out mixing dry mixing 1min by sulphate aluminium cement, Portland cement, silicon ash and fluvial sand, obtain compound； In gained compound, add remaining water (i.e. deduction dissolves lithium carbonate and the water of boric acid), water reducer, stir 2-3min, Prepare mixture slurry；
4) steel fibre and vinal being homogeneously added in mixture slurry respectively, 3min is equal to assorted fibre in stirring It is dispersed in mixture slurry evenly, obtains fibrous mixture slurry；
5) Lithium carbonate solution and boric acid solution are added step 4) in the fibrous mixture slurry of gained, stir 1min；
6) by 5) gained slurry pours die for molding into, floating, cover film, the demoulding after standing 4～5h, carries out maintenance, Obtain the strongest lower shrinkage high tenacity cement based engineering material.
Prepared by the present embodiment morning, the match ratio of strong lower shrinkage high tenacity cement based engineering material was shown in Table 1, service behaviour, mechanical property 2 and table 3 can be shown in Table with endurance quality parameter.
Embodiment 3:
The strongest a kind of lower shrinkage high tenacity cement based engineering material, the weight proportion (kg/m of each raw material3) it is: water 200, sulfur Aluminate cement 490, Portland cement 60, silicon ash 50, steel fibre 50, vinal 9, water reducer 7.1, Early strength agent 0.22, retarder 1.8, fluvial sand 1210.
Above-mentioned a kind of morning strong lower shrinkage high tenacity cement based engineering material preparation method, comprise the following steps:
1) raw material is weighed according to above-mentioned raw materials proportioning；
2) take part water and be heated into warm water (temperature of described warm water is 45～60 DEG C), respectively by early strength agent (lithium carbonate) and Retarder (boric acid) dissolves in warm water, obtains Lithium carbonate solution and boric acid solution；
3) carry out mixing dry mixing 1min by sulphate aluminium cement, Portland cement, silicon ash and fluvial sand, obtain compound； In gained compound, add remaining water (i.e. deduction dissolves lithium carbonate and the water of boric acid), water reducer, stir 2-3min, Prepare mixture slurry；
4) steel fibre and vinal being homogeneously added in mixture slurry respectively, 3min is equal to assorted fibre in stirring It is dispersed in mixture slurry evenly, obtains fibrous mixture slurry；
5) Lithium carbonate solution and boric acid solution are added step 4) in the fibrous mixture slurry of gained, stir 1min；
6) by 5) gained slurry pours die for molding into, floating, cover film, the demoulding after standing 4～5h, carries out maintenance, Obtain the strongest lower shrinkage high tenacity cement based engineering material.
Prepared by the present embodiment morning, the match ratio of strong lower shrinkage high tenacity cement based engineering material was shown in Table 1, service behaviour, mechanical property 2 and table 3 can be shown in Table with endurance quality parameter.
Embodiment 4:
The strongest a kind of lower shrinkage high tenacity cement based engineering material, the weight proportion (kg/m of each raw material3) it is: water 200, sulfur Aluminate cement 460, Portland cement 50, silicon ash 70, steel fibre 50, vinal 8, water reducer 7.1, Early strength agent 0.22, retarder 1.8, fluvial sand 1220.
Above-mentioned a kind of morning strong lower shrinkage high tenacity cement based engineering material preparation method, comprise the following steps:
1) raw material is weighed according to above-mentioned raw materials proportioning；
2) take part water and be heated into warm water (temperature of described warm water is 45～60 DEG C), respectively by early strength agent (lithium carbonate) and Retarder (boric acid) dissolves in warm water, obtains Lithium carbonate solution and boric acid solution；
3) carry out mixing dry mixing 1min by sulphate aluminium cement, Portland cement, silicon ash and fluvial sand, obtain compound； In gained compound, add remaining water (i.e. deduction dissolves lithium carbonate and the water of boric acid), water reducer, stir 2-3min, Prepare mixture slurry；
4) steel fibre and vinal being homogeneously added in mixture slurry respectively, 3min is equal to assorted fibre in stirring It is dispersed in mixture slurry evenly, obtains fibrous mixture slurry；
5) Lithium carbonate solution and boric acid solution are added step 4) in the fibrous mixture slurry of gained, stir 1min；
6) by 5) gained slurry pours die for molding into, floating, cover film, the demoulding after standing 4～5h, carries out maintenance, Obtain the strongest lower shrinkage high tenacity cement based engineering material.
Prepared by the present embodiment morning, the match ratio of strong lower shrinkage high tenacity cement based engineering material was shown in Table 1, service behaviour, mechanical property 2 and table 3 can be shown in Table with endurance quality parameter.
Embodiment 5:
The strongest a kind of lower shrinkage high tenacity cement based engineering material, the weight proportion (kg/m of each raw material3) it is: water 220, sulfur Aluminate cement 480, Portland cement 60, silicon ash 70, steel fibre 50, vinal 8, water reducer 7, Early strength agent 0.21, retarder 1.9, fluvial sand 1180.
Above-mentioned a kind of morning strong lower shrinkage high tenacity cement based engineering material preparation method, comprise the following steps:
1) raw material is weighed according to above-mentioned raw materials proportioning；
2) take part water and be heated into warm water (temperature of described warm water is 45～60 DEG C), respectively by early strength agent (lithium carbonate) and Retarder (boric acid) dissolves in warm water, obtains Lithium carbonate solution and boric acid solution；
3) carry out mixing dry mixing 1min by sulphate aluminium cement, Portland cement, silicon ash and fluvial sand, obtain compound； In gained compound, add remaining water (i.e. deduction dissolves lithium carbonate and the water of boric acid), water reducer, stir 2-3min, Prepare mixture slurry；
4) steel fibre and vinal being homogeneously added in mixture slurry respectively, 3min is equal to assorted fibre in stirring It is dispersed in mixture slurry evenly, obtains fibrous mixture slurry；
5) Lithium carbonate solution and boric acid solution are added step 4) in the fibrous mixture slurry of gained, stir 1min；
6) by 5) gained slurry pours die for molding into, floating, cover film, the demoulding after standing 4～5h, carries out maintenance, Obtain the strongest lower shrinkage high tenacity cement based engineering material.
Prepared by the present embodiment morning, the match ratio of strong lower shrinkage high tenacity cement based engineering material was shown in Table 1, service behaviour, mechanical property 2 and table 3 can be shown in Table with endurance quality parameter.
The embodiment 6 of contrast
A kind of common cement-base engineering material, the weight proportion (kg/m of each component3) it is: water 370, Portland cement 900, flyash 100, quartz sand 900, ordinary water-reducing agent 10, vinal 26.
The preparation method of described common cement-base engineering material includes: weigh raw material according to above-mentioned raw materials proportioning, by cement, powder Coal ash and vinal mixing dry mixing 1min, make Binder Materials and vinal be sufficiently mixed uniformly, be subsequently added Water, water reducer stirring 4min, makes slurry be sufficiently stirred for, mixture slurry is poured into die for molding, floating, cover film, Stand the demoulding after 24h, carry out maintenance, obtain described common cement-base engineering material.
The match ratio of common cement-base engineering material described in the present embodiment is shown in Table 1, service behaviour, mechanical property and endurance quality ginseng Number is shown in Table 2 and table 3.
Table 1 be embodiment 1～5 preparation morning strong lower shrinkage high tenacity cement based engineering material and embodiment 6 preparation light water The match ratio of mud base engineering material.
Table 1 embodiment 1～6 cement based engineering material match ratio (kg/m3)
The common cement-base that morning, strong lower shrinkage high tenacity cement based engineering material prepared with embodiment 6 that embodiment 1～5 is prepared Service behaviour and the mechanical property of engineering material are tested, and the results are shown in Table 2.
The service behaviour of the cement based engineering material that table 2 embodiment 1～6 prepares and mechanical property parameters
Table 2 illustrates: compared with common cement-base engineering material, strong lower shrinkage high tenacity cement based engineering morning prepared by the present invention Material favorable working performance, early strength are high, illustrate to apply ultra-dispersed viscosity reduction high efficiency water reducing agent and steel fibre to replace part polyethylene The lower viscosity that can effectively reduce cement based engineering material slurry of both alcohol fibers effect jointly, improves the work of cement based engineering material Make performance；Also illustrate that retarder and early strength agent compound, the setting time that can effectively regulate cement based engineering material can protect again Demonstrate,prove higher early strength, meet the requirement of fast repairing material high-early-strength.
Compared with common cement-base engineering material, strong lower shrinkage high tenacity morning cement based engineering material later stage power prepared by the present invention Performance is good, and bent toughness is suitable.Illustrate that low-elasticity-modulus steel fibre and high-elastic modulus polyvinyl alcohol fibre mix and can have complementary advantages, Mortar gives full play to the two performance effect and dimensional effect, toughness reinforcing, the reinforced effects of comprehensive raising.
The common cement-base that morning, strong lower shrinkage high tenacity cement based engineering material prepared with embodiment 6 that embodiment 1～5 is prepared Volume stability and the endurance quality of engineering material are tested, and calculate folk prescription cost, the results are shown in Table 3.
The volume stability of cement based engineering material, endurance quality and the cost parameter that table 3 embodiment 1～6 prepares
Table 3 illustrates: compared with common cement-base engineering material, strong lower shrinkage high tenacity cement based engineering morning prepared by the present invention Material, has good endurance quality；Dry-shrinkage deformed little, it is the 1/9 of common cement-base engineering material, shows to use aluminium sulfate Cement compound silicate cement and silicon ash do Binder Materials, can significantly improve the volume stability of cement based engineering material；Single Side's low cost, has saved the cost of raw material of 60%, and economic benefit is obvious, has preferable actual application value.
Detection embodiment 1～5 preparation morning strong lower shrinkage high tenacity cement based engineering material service behaviour, mechanical property and resistance to Performance parameter for a long time, strong lower shrinkage high tenacity cement based engineering material morning prepared by the result display present invention, there is good mechanics Performance, volume stability and endurance quality, actual application value is big.
The each raw material that the present invention relates to and the bound value of technological parameter, interval value can realize the present invention, at this most one by one Enumerate embodiment.

Claims (10)

1. one kind morning strong lower shrinkage high tenacity cement based engineering material, it is characterised in that it is by comprising sulphate aluminium cement, common Portland cement, silicon ash, steel fibre, vinal, water, water reducer, early strength agent, retarder and fluvial sand raw material system For forming, the content of each raw material is: sulphate aluminium cement 460～500kg/m3, Portland cement 50～70kg/m3, silicon Ash 50～70kg/m3, steel fibre 40～60kg/m3, vinal 8～10kg/m3, water 200～220kg/m3, water reducer 7.0～7.4kg/m3, early strength agent 0.2～0.22kg/m3, retarder 1.7～1.9kg/m3, fluvial sand 1180～1220kg/m3。
The strongest a kind of lower shrinkage high tenacity cement based engineering material the most according to claim 1, it is characterised in that described Sulphate aluminium cement is R.SAC42.5 sulphate aluminium cement, specific surface area >=400m2/ kg, 0.08mm tail over≤10.0%, 0.2%≤28d free swelling rate≤0.4%.
The strongest a kind of lower shrinkage high tenacity cement based engineering material the most according to claim 1, it is characterised in that described Portland cement is PO42.5 portland cement, specific surface area >=300m2/kg。
The strongest a kind of lower shrinkage high tenacity cement based engineering material the most according to claim 1, it is characterised in that described Silicon ash is SILICA FUME, specific surface area >=20000m2/ kg, activity index >=90%.
The strongest a kind of lower shrinkage high tenacity cement based engineering material the most according to claim 1, it is characterised in that described Steel fibre is copper facing short silk steel fibre, diameter 0.2mm, length 10mm, tensile strength >=1800MPa, elastic modelling quantity >= 200MPa。
The strongest a kind of lower shrinkage high tenacity cement based engineering material the most according to claim 1, it is characterised in that described The a length of 12mm of vinal, draw ratio 316, fracture strength >=1600MPa, elastic modelling quantity >=28GPa.
The strongest a kind of lower shrinkage high tenacity cement based engineering material the most according to claim 1, it is characterised in that described Water reducer is ultra-dispersed viscosity reduction polycarboxylic acid series high efficiency water reducing agent.
The strongest a kind of lower shrinkage high tenacity cement based engineering material the most according to claim 1, it is characterised in that described Early strength agent is lithium carbonate, technical grade, content >=98% (quality).
The strongest a kind of lower shrinkage high tenacity cement based engineering material the most according to claim 1, it is characterised in that described Retarder is boric acid, technical grade, content >=98% (quality)；Described fluvial sand clay content is 0% (quality), and particle diameter is little In 1.18mm, modulus of fineness≤1.7, apparent density≤2700kg/m3。
A kind of morning the most according to claim 1 strong lower shrinkage high tenacity cement based engineering material preparation method, its feature It is to comprise the following steps:
1) by the content of each raw material it is: sulphate aluminium cement 460～500kg/m3, Portland cement 50～70kg/m3, silicon Ash 50～70kg/m3, steel fibre 40～60kg/m3, vinal 8～10kg/m3, water 200～220kg/m3, water reducer 7.0～7.4kg/m3, early strength agent 0.2～0.22kg/m3, retarder 1.7～1.9kg/m3, fluvial sand 1180～1220kg/m3, weigh former Material；
2) take part water and be heated into warm water, respectively early strength agent and retarder are dissolved in warm water, obtain Lithium carbonate solution and boron Acid solution；
3) carry out mixing dry mixing by sulphate aluminium cement, Portland cement, silicon ash and fluvial sand, obtain compound；Institute Obtain in compound and add remaining water, water reducer, stirring, prepare mixture slurry；
4) respectively steel fibre and vinal are homogeneously added in mixture slurry, stirring, obtain fibrous mixing Slurry；
5) Lithium carbonate solution and boric acid solution are added step 4) in the fibrous mixture slurry of gained, stirring；
6) by 5) gained slurry pours die for molding into, the demoulding after standing 4～5h, and carry out maintenance, obtain the strongest lower shrinkage High tenacity cement based engineering material.
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CN107140921A (en) * 2017-06-29 2017-09-08 上海罗洋新材料科技有限公司 A kind of high ductility cement-base composite material of super hardening and preparation method thereof
CN107558364A (en) * 2017-09-29 2018-01-09 中交公路长大桥建设国家工程研究中心有限公司 A kind of low drying shrinkage cement-based material bridge deck pavement structure of ultra-tough and construction method
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