CN1850707A - Self-compacted concrete of resisting erosion of sulfate and its preparing method - Google Patents

Self-compacted concrete of resisting erosion of sulfate and its preparing method Download PDF

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Publication number
CN1850707A
CN1850707A CNA2006100264537A CN200610026453A CN1850707A CN 1850707 A CN1850707 A CN 1850707A CN A2006100264537 A CNA2006100264537 A CN A2006100264537A CN 200610026453 A CN200610026453 A CN 200610026453A CN 1850707 A CN1850707 A CN 1850707A
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concrete
flyash
self
cement
silicon ash
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CN100336765C (en
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钟世云
薛明
鲍明轩
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Tongji University
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Tongji University
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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
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00034—Physico-chemical characteristics of the mixtures
    • C04B2111/00103—Self-compacting mixtures
    • 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

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  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The invention relates to a sulfate corrosion-resistant self-compacted concrete and the preparing method, adopting fly ash, slag and siliceous dust and cement as concrete cementitous material and adding in water reducer and thickening agent to prepare a high-fluidity self-compacted concrete. And the components in the concrete which are corroded by sulfate are remarkably reduced so as to reduce possibility of corrosion to the concrete. And the concrete has high fluidity, slump above 25 cm, extensibility above 60 cm, and blocking ratio above 0.8; and the corrosion test of above 9 months with 10% sodium sulfate solution shows that compressive ratio is above 0.8 and the surface is complete. And the preparing method is simple, and has low cost and wide application.

Description

Self-compacting concrete of resisting erosion of sulfate and preparation method thereof
Technical field
The invention belongs to the material technology field, be specifically related to self-compacting concrete of a kind of resisting erosion of sulfate and preparation method thereof.
Background technology
In recent years, China relevant departments have carried out multi-faceted research to the structures anticorrosion technique of saline soil area, have proposed some engineering punishment methods, have obtained certain achievement.Be several technology that the sulfate resistance concrete is used at present below: the one, use sulphate-resistant cement, sulphate-resistant cement is relative ordinary portland cement on composition, has reduced tricalcium aluminate (C 3A) content is so lowered the possibility that concrete weathers; The 2nd, the application of mineral admixture.Use mineral admixture and reduce in the concrete C in the hydrated cementitious product 3The content of A is brought into play the volcanic ash effect and the filling effect of mineral admixture simultaneously, strengthens concrete density, strengthens concrete sulfate resistance performance; The 3rd, the application of paint coating protection prevents that having the composition of erosion action to infiltrate inside concrete to concrete causes concrete destruction.
But because the saline soil distributed areas of China are wide, moiety is complicated, but the sulphate-resistant cement place of production and output are all seldom, and this brings difficulty just for the concrete anticorrosion punishment of saline soil area.All in all, engineering bound pair saline soil area anticorrosion concrete technical study at present is thorough inadequately, does not fundamentally solve, the domestic very reasonable method that do not find as yet.
Summary of the invention
The objective of the invention is to propose self-compacting concrete of a kind of resisting erosion of sulfate with good workability and endurance quality and preparation method thereof.
For solving the problems of the technologies described above, concrete of the present invention is formed the higher sand coarse aggregate ratio (0.4～0.5) of employing, higher agglutinate content (500kg/m 3More than), higher water reducer content obtains higher flowability, reaches the requirement of self-compacting concrete to flowability, for concrete is not emanated, in concrete, add thickening material and prevent concrete disintegration simultaneously.
The self-compacting concrete of the resisting erosion of sulfate that the present invention proposes is made up of as concrete cement material, yellow ground, stone, water reducer and thickening material mineral admixture and ordinary portland cement, and it is as follows that it forms proportioning:
Component kg/m 3
Concrete cement material 520～550
Water 216
Yellow ground (particle diameter 0～5mm, fineness modulus 2.17) 815～835
(rubble, particle diameter 5mm～15mm) 825～845 for stone
Water reducer 3.78～7.32
Thickening material 0.81～1.08;
Wherein: what concrete agglutinate can be for following composition is a kind of:
(1) mineral admixture adopts flyash, and concrete cement material is made up of flyash and cement, and the add-on of flyash is 30%～50% of a concrete cement material weight;
(2) mineral admixture adopts the silicon ash, and concrete cement material is made up of silicon ash and cement, and the add-on of silicon ash is 5%～10% of a concrete cement material weight;
(3) mineral admixture adopts flyash and silicon ash, and concrete cement material is made up of flyash, silicon ash, cement, and the add-on of flyash is 40%～50% of a concrete cement material weight, and the add-on of silicon ash is 3%～8% of a concrete cement material weight;
(4) mineral admixture adopts flyash, silicon ash and slag, concrete cement material is made up of flyash, silicon ash, slag, cement, the add-on of flyash is 30%～35% of a concrete cement material weight, the add-on of silicon ash is 4%～7% of a concrete cement material weight, 28%～32% of scoriaceous add-on concrete cement material weight.
Among the present invention, described water reducer is a polycarboxylate dehydragent.
Among the present invention, described thickening material is the thickening material of cellulose ethers.Its viscosity (2% aqueous solution, 20 ℃) is 300～600mPas.
Self-compacting concrete (self-compacting concrete is called for short SCC) also claims the without vibration concrete, it is a kind of high performance concrete, why being called high-performance, is because this concrete mix has reached the unification of coordinating with plasticity, stickiness, flowability, education resistance.Self-compacting is meant that then it has high fluidity, promptly very high workability, under the situation of not vibrating or also can vibrate less in case of necessity, can be full of model densely, do not emanate, not the Qinshui, can not produce normal concrete like that owing to the mass defects such as the improper honeycomb that causes, pitted skin and interior void of vibrating, and have good mechanical performance and endurance quality concurrently.
Self-compacting concrete is concrete developing direction, self-compacting concrete has very good workability, can reduce the defective of bringing owing to the eakiness of manually vibrating effectively, thereby reduce harmful salt, can also increase work efficiency to inside concrete erosive probability.
Singly mixing or mixing again of various mineral admixtures in the agglutinate reduced C in the agglutinate 3The per-cent of A, thus the quantity of concrete objectionable constituent drated calcium aluminates reduced, played the effect of certain sulfate resistance.The adding of silicon ash has clearly effect to the raising of concrete compaction degree, can resist harmful ion effectively to concrete infiltration.Mineral admixture can also generate the C-S-H of opposing sulphate attack with the CH reaction that hydrated cementitious generates, and has further played the effect of sulfate resistance.
The present invention proposes the self-compacting concrete preparation method of resisting erosion of sulfate, and its concrete steps are as follows:
Take by weighing raw material by said ratio,, add the compound of thickening material and agglutinate then stirring 1-3 minute in yellow ground and the stone adding stirrer, dry powder stirred 1-1.5 minute, the water that will be mixed with water reducer at last joins in the stirrer, stirs 2～4 minutes, promptly gets desired product.
Among the present invention, can add polymer emulsion modified self-compacting concrete, the add-on of polymer emulsion (in polymer solids) is 7%～15% of a concrete cement material weight, the polymer emulsion that is added is benzene emulsion, styrene-butadiene emulsion etc., when adding water and emulsion, to note adding earlier water, add emulsion again after after stirring, and stir.
The present invention is because the high volume of mineral admixture mixes, and the content that is subjected to the sulphate attack composition in the concrete significantly reduces, and has reduced the possibility that concrete weathers.Self-compacting concrete does not need artificial to vibrate simultaneously, has significantly reduced owing to the inhomogeneous formed defective of manually vibrating, and has significantly reduced expending of manpower.This kind sulfate resistance self-compacting concrete has following property: have higher flowability, the slump is more than 25cm, and divergence is more than 60cm, and retardance rate (blocking ratio) is more than 0.8; Soak in 10% metabisulfite solution and reach more than 1 year, pressure-resisting ratio is still more than 0.8, and the surface is intact.The purpose that preparation technology of the present invention is very simple, with low cost, can reach widespread use.
The present invention has following advantage:
1, because self-compacting concrete of the present invention has higher flowability, need not to vibrate, direct casting so construction technology is very simple, and is compared with the concrete of the common moulding of vibrating, and has reduced the injurous defect of bringing owing to the eakiness of vibrating.
2, because the present invention has adopted three kinds of mineral admixtures to substitute part cement (high volume 30%～65%), increased concrete density, reduced the possibility of vitriol, also reduced concrete cost simultaneously to the inside concrete infiltration.
3, because starting material of the present invention all adopt commercially available finished product,, be suitable for widespread use so starting material are easy to get.
Embodiment
Below in conjunction with embodiment technical scheme of the present invention is further described.
Embodiment 1: the silicon ash is singly mixed the sulfate resistance self-compacting concrete, and material therefor specification and manufacturer see Table 1, cement composition analysis in table 2, and silicon gray technology index sees Table 3.
Table 1
Material The specification or the trade mark The source
Cement The PO42.5 ordinary portland cement Shanghai sea dog Cement Group
The silicon ash EM920U Dust is agree international trade Shanghai company limited
Sand Fineness modulus is 2.17, apparent density 2.25 (g/cm 3) Common yellow ground
Stone Particle size range is 5mm～15mm, apparent density 2.09 (g/cm 3)
Thickening material MHPC500PF U.S. He Ke man of great strength company
Water reducer PC new concrete high efficiency water reducing agent; The pH value is neutral; Solid content 40%; Viscosity (being coated with-4 glasss) 40s Aoshen Building Chemical Science ﹠ Technology Co., Ltd., Shanghai
Table 1 cement composition analytical table
Loss on ignition SiO 2 CaO MgO Al 2O 3 Fe 2O 3 SO 3 TiO 2 K 2O Na 2O
3.88 23.97 55.19 30.16 7.92 2.84 2.14 0.10 0.58 0.22
Table 2 silicon gray technology index
SiO 2/％ Water content/% Loss on ignition (975 ℃)/% 45 μ m tail over/% Tap density/(kg/m 3)
92.25 1.21 1.36 1.02 280
Silicon ash self-compacting concrete component and comparative example component see Table 4, and water cement ratio is about 0.4 in this component, and sand coarse aggregate ratio is 0.5, makes self-compacting concrete according to aforesaid concrete formulating method.Silicon ash self-compacting concrete and comparative example performance relatively see Table 5.
Table 4 silicon ash self-compacting sulfate resistance concrete component and comparative example component thereof
Material usage (kg/m 3) SF5 SF10 Comparative example 1 Comparative example 2
Cement 513 495 533.3 524
The silicon ash 27 55 6.7 16
Sand 825 825 825 825
Stone 825 825 825 825
Water reducer 3.78 5.4 3.78 3.78
Thickening material 0.54 0.81 0.81 0.81
Table 5 silicon ash self-compacting concrete and comparative example performance are relatively
Performance SF5 SF10 Comparative example 1 Comparative example 2
The slump (cm) 26 27 27 26
Divergence (cm) 59 67 67 66
Retardance rate (blocking ratio) 0.85 0.87 0.95 0.96
28d ultimate compression strength (MPa) 62.4 60.7 58.9 41.8
Pressure-resisting ratio after weathering 9 months 0.98 0.98 0.35 0.45
Embodiment 2: the flyash list is mixed the sulfate resistance self-compacting concrete, and material therefor specification and manufacturer see Table 6, cement composition analysis in table 2.
Table 6
Material The specification or the trade mark The source
Cement The PO42.5 ordinary portland cement Shanghai sea dog Cement Group
Flyash II level ash, 45 μ m tail over 15.28% Shanghai HaiLi Industry And Trade Co., Ltd
Sand Fineness modulus is 2.17, apparent density 2.25 (g/cm 3) Common yellow ground
Stone Particle size range is 5mm～15mm, apparent density 2.09 (g/cm 3)
Thickening material MHPC500PF U.S. He Ke man of great strength company
Water reducer GLENIUM SP-8CN The special building materials of Shanghai Mace company limited
The flyash list is mixed sulfate resistance self-compacting concrete component and is seen Table 7, and water cement ratio is about 0.4 in this prescription, and sand coarse aggregate ratio is 0.5, makes self-compacting concrete according to aforesaid concrete formulating method.The flyash list is mixed sulfate resistance self-compacting concrete composition and is seen Table 8 with the comparative example composition, and the sulfate resistance self-compacting concrete mixed by the flyash list and the comparative example performance relatively sees Table 9.
Table 3 flyash list is mixed the sulfate resistance self-compacting concrete and is formed and the comparative example composition
Material usage (kg/m 3) FA3 FA4 FA5 Comparative example 1 Comparative example 2
Cement 265 385 270 486 432
Flyash 265 165 270 54 108
Water 216 216 216 216 216
Sand 825 815 825 825 825
Stone 825 825 825 825 825
Water reducer 5.67 6.48 8.10 5.67 5.67
Thickening material 0.81 0.81 1.08 0.81 0.81
Table 4 flyash list is mixed sulfate resistance self-compacting concrete and comparative example performance thereof
Performance FA3 FA4 FA5 Comparative example 1 Comparative example 2
The slump (cm) 26 27 27 26 26
Divergence (cm) 70 68 69 70 70
Retardance rate (blocking ratio) 0.90 0.90 0.89 0.93 0.92
28d ultimate compression strength (MPa) 39.2 37.7 35.8 45.7 42.6
Pressure-resisting ratio after weathering 9 months 0.96 1.06 1.09 0.78 0.81
Embodiment 3: flyash, grey pair of silicon are mixed self-compacting concrete, and material therefor specification and manufacturer see Table 10.
Table 10
Material The specification or the trade mark The source
Cement The PO42.5 ordinary portland cement Shanghai conch cement limited liability company
Flyash II level ash, 45 μ m tail over 15.28% Shanghai HaiLi Industry And Trade Co., Ltd
The silicon ash EM920U Dust is agree international trade Shanghai company limited
Sand Fineness modulus is 2.17, apparent density 2.25 (g/cm 3) Common yellow ground
Stone Particle size range is 5mm～15mm, apparent density 2.09 (g/cm 3)
Tackifier Tylose H 300 G4 Germany Clariant company
Water reducer GLENIUM SP-8CR The special building materials of Shanghai Mace company limited
Benzene emulsion (SAE) Acronal S400, solid content 57% Basf China Co., Ltd produces
Flyash, the two sulfate resistance self-compacting concrete compositions of mixing of silicon ash see Table 11 with the comparative example composition, and water cement ratio is about 0.4 in this component, and sand coarse aggregate ratio is 0.5, makes self-compacting concrete according to aforesaid concrete formulating method.Grey pair of flyash and silicon mix the sulfate resistance self-compacting concrete and its comparative example performance relatively sees Table 12.
Table 11
Material usage (kg/m 3) FASF1 FASF2 Comparative example 1 Comparative example 2
Cement 260 243 459 405
Flyash 244.4 270 54 108
The silicon ash 15.6 27 27 27
Water 181 176 216 216
Sand 825 835 825 825
Stone 825 845 825 825
Water reducer 7.32 7.32 7.32 7.32
Thickening material 0.81 0.81 0.81 0.81
Benzene emulsion 63.9 95
Table 12
Performance FASF4 FASF5 Comparative example 1 Comparative example 2
The slump (cm) 26 26 27 26
Divergence (cm) 65 62 67 66
Retardance rate (blocking ratio) 0.88 0.87 0.91 0.91
28d ultimate compression strength (MPa) 33.9 27.4 45.2 50.7
Pressure-resisting ratio after weathering 9 months 0.99 1.01 0.74 0.77
Embodiment 4: flyash, silicon ash, slag three are mixed the sulfate resistance self-compacting concrete, and material therefor specification and manufacturer see Table 13.
Material The specification or the trade mark The source
Cement The PO42.5 ordinary portland cement Shanghai Cement Plant
Flyash II level ash, 45 μ m tail over Shanghai HaiLi Industry And Trade Co., Ltd
15.28％
The silicon ash EM920U Dust is agree international trade Shanghai company limited
Slag S-95, fineness is 430m 2/kg Last Hypon field emerging building materials company limited produces
Sand Fineness modulus is 2.17, apparent density 2.25 (g/cm 3) Common yellow ground
Stone Particle size range is 5mm～15mm, apparent density 2.09 (g/cm 3)
Tackifier CELLOSIZE QP 300 Dow Chemical company
Water reducer PC new concrete high efficiency water reducing agent; The pH value is neutral; Solid content 40%; Viscosity (being coated with-4 glasss) 40s Aoshen Building Chemical Science ﹠ Technology Co., Ltd., Shanghai
The composition that flyash, silicon ash, slag three are mixed sulfate resistance self-compacting concrete and comparative example thereof sees Table 14, and water cement ratio is about 0.4 in this composition, and sand coarse aggregate ratio is 0.5, makes self-compacting concrete according to aforesaid concrete formulating method.Flyash, silicon ash, slag three mix the sulfate resistance self-compacting concrete and its comparative example performance relatively sees Table 15.
Table 14
Material usage (kg/m 3) FSS Comparative example 1 Comparative example 2 Comparative example 3
Cement 189 378 378 378
Flyash 162 162 162
The silicon ash 27
Slag 162 162 162
Water 216 216 216 216
Sand 825 825 825 825
Stone 825 825 825 825
Water reducer 3.78 3.78 3.78 3.78
Thickening material 1.0 1.0 1.0 1.0
Table 15
Performance FSS3 Comparative example 1 Comparative example 2 Comparative example 3
The slump (cm) 26.5 26 26 26
Divergence (cm) 64 70 62 68
Retardance rate (blocking 0.92 0.94 0.95 0.91
ratio)
28d ultimate compression strength (MPa) 45.4 39.2 53.1 44.2
Pressure-resisting ratio after weathering 9 months 1.01 0.66 It is bad to have burst 0.88
From embodiment 1-embodiment 4 as can be seen, the present invention has higher flowability, and the slump is more than 25cm, and divergence is more than 60cm, and retardance rate (blocking ratio) is more than 0.8.And concrete sample of the present invention is through 9 months erosion test of 10% metabisulfite solution, and pressure-resisting ratio is still more than 0.8, and the surface is intact.

Claims (5)

1, a kind of self-compacting concrete of resisting erosion of sulfate is characterized in that being made up of as concrete cement material, yellow ground, stone, water reducer and thickening material mineral admixture and cement, and it is as follows that it forms proportioning:
Component kg/m 3
Concrete cement material 520～550
Water 216
Particle diameter 0～5mm, the yellow ground 815～835 of fineness modulus 2.17
The stone 825～845 of particle diameter 5mm～15mm
Water reducer 3.78～7.32
Thickening material 0.81～1.08;
Wherein: concrete cement material is a kind of of following composition:
(1) mineral admixture adopts flyash, and concrete cement material is made up of flyash and cement, and the add-on of flyash is 30%～50% of a concrete cement material weight;
(2) mineral admixture adopts the silicon ash, and concrete cement material is made up of silicon ash and cement, and the add-on of silicon ash is 5%～10% of a concrete cement material weight;
(3) mineral admixture adopts flyash and silicon ash, and concrete cement material is made up of flyash, silicon ash, cement, and the add-on of flyash is 40%～50% of a concrete cement material weight, and the add-on of silicon ash is 3%～8% of a concrete cement material weight;
(4) mineral admixture adopts flyash, silicon ash and slag, concrete cement material is made up of flyash, silicon ash, slag, cement, the add-on of flyash is 30%～35% of a concrete cement material weight, the add-on of silicon ash is 4%～7% of a concrete cement material weight, 28%～32% of scoriaceous add-on concrete cement material weight.
2, the self-compacting concrete of resisting erosion of sulfate according to claim 1 is characterized in that described water reducer is a polycarboxylate dehydragent.
3, the self-compacting concrete of resisting erosion of sulfate according to claim 1 is characterized in that described thickening material is the thickening material of cellulose ethers.
4, a kind of self-compacting concrete preparation method of resisting erosion of sulfate as claimed in claim 1, it is characterized in that concrete steps are as follows: take by weighing raw material by proportioning, to stir 1-3 minute in yellow ground and the stone adding stirrer, the compound that adds thickening material and agglutinate then, dry powder stirred 1-1.5 minute, the water that will be mixed with water reducer at last joins in the stirrer, stirs 2～4 minutes, promptly gets desired product.
5, the self-compacting concrete of resisting erosion of sulfate according to claim 1, it is characterized in that adding polymer emulsion modified self-compacting concrete, in polymer solids, the add-on of polymer emulsion is 7%～15% of a concrete cement material weight, and described polymer emulsion is a kind of of benzene emulsion, styrene-butadiene emulsion.
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