CN102173628A - Shrinkage-reducing compound additive capable of effectively reducing CA (cement and asphalt) mortar bleeding, and CA mortar dry material and CA mortar containing same - Google Patents
Shrinkage-reducing compound additive capable of effectively reducing CA (cement and asphalt) mortar bleeding, and CA mortar dry material and CA mortar containing same Download PDFInfo
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- CN102173628A CN102173628A CN 201110062712 CN201110062712A CN102173628A CN 102173628 A CN102173628 A CN 102173628A CN 201110062712 CN201110062712 CN 201110062712 CN 201110062712 A CN201110062712 A CN 201110062712A CN 102173628 A CN102173628 A CN 102173628A
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- Prior art keywords
- mortar
- bleeding
- effectively reduce
- composite
- shrinkage
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Classifications
-
- 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
- C04B2/00—Lime, magnesia or dolomite
- C04B2/10—Preheating, burning calcining or cooling
-
- 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
Abstract
The invention discloses a shrinkage-reducing compound additive capable of effectively reducing CA (cement and asphalt) mortar bleeding, and a CA mortar containing the same. The shrinkage-reducing compound additive capable of effectively reducing CA mortar bleeding comprises the following components in percentage by mass: 45-75% of CaO clinker and 25-55% of low-temperature calcined MgO. The shrinkage-reducing compound additive capable of effectively reducing CA mortar bleeding accounts for 1-4% by mass of the CA mortar dry material. The CA mortar containing the additive has the advantages of low bleeding rate, small degree of separation, and favorable freezing resistance, and has an obvious compensation action on volume shrinkage of the CA mortar in medium and later periods.
Description
Technical field
The invention belongs to building material technical field, be specifically related to a kind ofly can effectively reduce reducing composite additive and comprising its CA mortar drier and CA mortar of CA mortar bleeding.
Background technology
Along with Chinese society and rapid economy development, interzone visitor, goods come and go frequent day by day, in sharp increase, original railway system is because of environment Sino-Japan fade in unable to do what one wishes of factors such as speed is slow, comfort level difference in social economy's great development to the demand of transportation by railroad for people.High speed is the target of railway development.Railway high speed requirement track structure possesses that stability, ride comfort, track elasticity are suitable, track component reliably reaches conditions such as maintenance facility.The track structure form that high-speed railway adopts is divided into tiny fragments of stone, coal, etc. track and non-fragment orbit two classes, and wherein, non-fragment orbit mainly replaces original shot railway ballast as vibration-proof structure by fastener system or elastic layer.The more general non-fragment orbit structure rail of current application pillow supporting type, sleeper are embedded, sleeper embed type, the prefabricated railway roadbed of board-like, the no sleeper of the cast-in-place railway roadbed of no sleeper board-like (plate-type ballastless track) are several.Wherein, so-called " plate-type ballastless track " be with prefabricated track plate directly " placement " on concrete bed, adjust the track plate by backfilling cement bituminous mortar between track plate and base (cement asphalt mortar is called for short the CA mortar) material, to guarantee to lay precision.The CA mortar be a kind of by cement, emulsified bitumen, fine aggregate (sand), compound, water, aluminium powder, and function admixture multiple starting material such as (water reducer, defoamers etc.) form, a kind of novel organic/inorganic composite material that forms through the glued acting in conjunction of hydrated cementitious sclerosis and pitch breakdown of emulsion, it forms that complicated, performance index require characteristics such as high, that difficulty of preparation technology is big and the key that becomes the non-fragment orbit site operation with raw material.
The CA mortar is a kind of big water cement ratio, upper flow regime pouring material, is poured in the height of being made up of supporting course and track plate and has only in the flat long and narrow cavity about 30mm, requires to have high workability and extendability.Simultaneously, its rheological property has substantial connection with delamination degree (homogeneity) and construction pouring quality again.Newly mix CA mortar viscosity hour, easily cause flowability and extendability excessive, aggregate wherein sinks and emulsified bitumen particle come-up, and follow serious bleeding and contraction, in addition, flowability and the excessive CA mortar easy whole harmony height in cavity of extendability, the portion gas on its top layer is easily suppressed at the dead angle and can't be discharged, and the sclerosis back forms the super large bubble; When viscosity was big, the not stratified but mortar retrogradation of starting material component so that be difficult to pour into closely knit easily caused the not full consequence of perfusion at the end portion of track plate; CA mortar mobile and that scalability is suitable is filled in the mode of " disconnected picture is promoted comprehensively " in the sheet-type cavity, the intravital air in chamber can be driven out of fully to the venting hole at four angles, and filling effect is full.
At present, disclosed can improve CA mortar mixture bleeding and possess protect collapse and the technology of reducing function less, can realize that individually all there is defective in the correlation technique of partial function.Chinese patent ZL200610018440.5 discloses a kind of composite additive that can effectively prevent the CA mortar laminated segregation, with silicon ash, wilkinite and flyash is raw material, can make original laminated segregation (resolution＞3%), shrink the bigger not stratified segregation of CA mortar (resolution can＜0.5%), can reduce simultaneously its contraction and increase early strength, and can improve the workability of CA mortar.But the CA mortar of this patent disclosure does not reduce the function of bleeding, its so-called reducing function is realized by the wilkinite water-swelling, only early stage (CA mortar plastic state) being shunk from its mechanism of reducing has the part compensating action, and the contraction of sclerosis CA mortar middle and later periods be there is no positive effect.In addition, the wilkinite water-retaining capacity is very strong, and it can increase the thixotropy of CA mortar, for satisfying construction requirement, will certainly improve its flowability by mixing water or the water reducer that increases the CA mortar, but this measure meeting increases the risk of CA mortar bleeding.
Summary of the invention
The object of the present invention is to provide and a kind ofly can effectively reduce reducing composite additive, its application and comprising its CA mortar of CA mortar bleeding.
For solving the problems of the technologies described above, technical scheme of the present invention is:
A kind of composite additive that reduces that can effectively reduce CA mortar bleeding comprises CaO grog 45%～75% and low temperature calcination MgO25%～55%, and described per-cent is mass percent.
The calcining temperature of above-mentioned CaO grog is 1100～1300 ℃, and calcination time is 45min～90min.
The ratio table of above-mentioned CaO grog is drawn the long-pending 160m that is
2/ kg～400m
2/ kg.
Above-mentioned CaO grog is to be to mix in 90: 10～95: 5, calcine behind the grinding and make by Wingdale and composite mineralizer according to mass ratio; Described composite mineralizer is the mixture of at least a and gypsum in copper ashes and the chromium slag, described gypsum is 50%～70% in the mass content of composite mineralizer, surplus is copper ashes and/or chromium slag, when adopting copper ashes and chromium slag simultaneously, both concrete consumptions do not have special requirement, only need a total amount to reach to close 30～50% of mineralizer to get final product.
The hydration activity value of above-mentioned low temperature calcination MgO is 40～90s.
The calcining temperature of above-mentioned low temperature calcination MgO is 700～850 ℃, and calcination time is 40～80min.
Above-mentioned low temperature calcination MgO is made by magnesite calcining, MgO content 〉=85% wherein, and loss on ignition≤5% is 160m than the table picture is long-pending
2/ kg～380m
2/ kg.
According to ordinary method above-mentioned CaO grog and low temperature calcination MgO are mixed, get the composite additive that reduces that can effectively reduce CA mortar bleeding.
The composite additive that reduces that gained can effectively be reduced CA mortar bleeding adds in the CA mortar drier, and described composite additive shared mass percent in the CA mortar drier that can effectively reduce CA mortar bleeding is preferably 1%～4%.
The CA mortar that comprises above-mentioned CA mortar drier, can obviously not increase the water requirement (water requirement increases less than 1.5%) of CA mortar, and under the condition that does not influence CA mortar mixture flowability, extendability, operable time and ultimate compression strength, improve the bleeding and the homogeneity of CA mortar effectively: bleeding rate≤0.4%, resolution≤1.0%; Compensated the volumetric shrinkage of CA mortar middle and later periods significantly: CA mortar (self-constriction) 90d under the exchange of moisture situation that is hedged off from the outer world still is the microdilatancy state, shrinking percentage＜0.04% when being exposed in the air (dry shrinkage) 90d naturally; Improved the frost resistance of CA mortar significantly.
Embodiment
For a better understanding of the present invention, following picture is further illustrated content of the present invention in conjunction with the embodiments, but content of the present invention not only is confined to down the embodiment of picture.
The flowability of CA mortar, divergence, operable time, resolution, ultimate compression strength and anti-freezing property detect according to the regulation of " the provisional technical qualification of passenger dedicated railway line CRTS II type plate type unballasted track cement emulsified bitumen mortar "; Shrinking percentage detects by the regulation of " expansive cement swelling rate test method " (JC/T313-1982 (1996)); Bleeding is to pour in the container of a certain setting shape and volume mixing and stirring the isopyknic CA mortar in back, after bleeding appears in mortar, and sucking-off bleeding and weighing volume, the volume ratio of accumulative total bleeding quantity and CA mortar mixing water amount is a bleeding rate.
Below in all examples the cement intensity grade be P.II 52.5, emulsified bitumen is the AEA-II type anionic emulsified bitumen that Jiangsu Botexin Materials Co., Ltd produces, sand is the river sand of fineness modulus 1.8～2.0, and water reducer is a polycarboxylic acids dehydragent, and defoamer is silicone based superpower defoamer.
Embodiment 1
The preparation of CaO grog: wear into raw material after Wingdale and composite mineralizer mixed according to mass ratio at 92: 8, calcine 70min down at 1100 ℃, then in air quenching, grinding, cross 80 μ m sieve series and become, the composite mineralizer that makes by 40% etc. the copper ashes of quality and mixture C aO agglomerate ratio table that the chromium slag is formed draw and amass 350m
2/ kg～380m
2/ kg; Wherein form with 60% industrial gypsum.
Low temperature calcination MgO preparation: by magnesite behind calcining 60min under 800 ℃ of conditions, in air quenching, grinding, sieving through 80 μ m sieve makes, wherein, MgO content is 88%, loss on ignition is 3%, the hydration activity value is 60～70s, is 260m than the table picture is long-pending
2/ kg～280m
2/ kg.
Take by weighing CaO grog and low temperature calcination MgO in proportion, mix, get composite additive.
Embodiment 2
The preparation of CaO grog: wear into raw material after Wingdale and composite mineralizer mixed according to mass ratio at 90: 10, at 1300 ℃ of calcining 45min down, then in air quenching, grinding, cross 80 μ m sieve series and become, the CaO agglomerate ratio table that makes is drawn long-pending 180m
2/ kg～220m
2/ kg; Wherein composite mineralizer is made up of 30% copper ashes and 70% industrial gypsum.
Low temperature calcination MgO preparation: by magnesite behind calcining 40min under 850 ℃ of conditions, in air quenching, grinding, sieving through 80 μ m sieve makes, wherein, MgO content is 86%, loss on ignition is 3.5%, the hydration activity value is 80～90s, is 350m than the table picture is long-pending
2/ kg～370m
2/ kg.
Take by weighing CaO grog and low temperature calcination MgO in proportion, mix, get composite additive.
Embodiment 3
The preparation of CaO grog: wear into raw material after Wingdale and composite mineralizer mixed according to mass ratio at 95: 5, at 1200 ℃ of calcining 90min down, then in air quenching, grinding, cross 80 μ m sieve series and become, the CaO agglomerate ratio table that makes is drawn long-pending 270m
2/ kg～300m
2/ kg; Wherein mixture and 50% industrial gypsum be made up of 50% chromium slag of composite mineralizer formed.
Low temperature calcination MgO preparation: by magnesite behind calcining 80min under 720 ℃ of conditions, in air quenching, grinding, sieving through 80 μ m sieve makes, wherein, MgO content is 85%, loss on ignition is 5%, the hydration activity value is 45～55s, is 160m than the table picture is long-pending
2/ kg～200m
2/ kg.
Take by weighing CaO grog and low temperature calcination MgO in proportion, mix, get composite additive.
Embodiment 4
Cement 520kg, sand 950kg, emulsified bitumen 240kg, water 165kg, composite additive 30kg (adopts the prepared CaO grog 15kg of example 1, low temperature calcination MgO 15kg), water reducer PCA-H (Jiangsu Botexin Materials Co., Ltd) 1kg, defoamer DF-201 (Jiangsu Botexin Materials Co., Ltd) 0.9kg, all raw materials in proportion weighing good after, add stirrer and stir 240s fast, stir 60s slowly.The key technical indexes of the CA mortar of making: initial flow degree 97s, divergence 330mm, 30min degree of mobilization 104s, divergence 335mm; Operable time＞60min; Bleeding rate 0.27%; 90d drying shrinkage-0.038%, 90d rate of self-contraction+0.002%; Material separation degree 1.0%; 1d ultimate compression strength 4.2MPa, 28d ultimate compression strength 15.3MPa; Behind 56 freeze-thaw cycle, the mould of moving descends 17%.
Embodiment 5
Cement 520kg, sand 935kg, emulsified bitumen 240, water 167kg, composite additive 45kg (adopts the prepared CaO grog 27kg of example 2, low temperature calcination MgO 18kg), water reducer PCA-H (Jiangsu Botexin Materials Co., Ltd) 1kg, defoamer DF-201 (Jiangsu Botexin Materials Co., Ltd) 0.9kg, all raw materials in proportion weighing good after, add stirrer and stir 240s fast, stir 60s slowly.The key technical indexes of the CA mortar of making: initial flow degree 100s, divergence 320mm, 30min degree of mobilization 108s, divergence 325mm; Operable time＞60min; Bleeding rate 0.35%; 90d drying shrinkage-0.0358%, 90d rate of self-contraction+0.0059%; Material separation degree 0.9%; 1d ultimate compression strength 4.4MPa, 7d ultimate compression strength 16.0MPa; Behind 56 freeze-thaw cycle, the mould of moving descends 19%.
Embodiment 6
Cement 520kg, sand 920kg, emulsified bitumen 240kg, water 169kg, composite additive 60kg (adopts the prepared CaO grog 42kg of example 3, low temperature calcination MgO 18kg), water reducer PCA-H (Jiangsu Botexin Materials Co., Ltd) 1kg, defoamer DF-201 (Jiangsu Botexin Materials Co., Ltd) 0.9kg, all raw materials in proportion weighing good after, add stirrer and stir 240s fast, stir 60s slowly.The key technical indexes of the CA mortar of making: initial flow degree 103s, divergence 315mm, 30min degree of mobilization 110s, divergence 310mm; Operable time＞60min; Bleeding rate 0.4%; 90d drying shrinkage-0.031%, 90d rate of self-contraction+0.0092%; Material separation degree 0.8%; 1d ultimate compression strength 4.5MPa, 7d ultimate compression strength 15.2MPa; Behind 56 freeze-thaw cycle, the mould of moving descends 20%.
Embodiment 7
Cement 520kg, sand 900kg, emulsified bitumen 240kg, water 165kg, composite additive 15kg (adopting the prepared CaO grog 7kg of example 1, low temperature calcination MgO 8kg) water reducer PCA-H (Jiangsu Botexin Materials Co., Ltd) 1kg, defoamer DF-201 (Jiangsu Botexin Materials Co., Ltd) 0.9kg, all raw materials respectively in proportion weighing good after, the adding stirrer stirs 240s fast, stirs 60s slowly.The key technical indexes of the CA mortar of making: initial flow degree 101s, divergence 315mm, 30min degree of mobilization 114s, divergence 310mm; Operable time＞60min; Bleeding rate 0.35%; 90d drying shrinkage-0.033%, 90d rate of self-contraction+0.0097%; Material separation degree 0.8%; 1d ultimate compression strength 4.3MPa; 7d ultimate compression strength 15.7MPa; Behind 56 freeze-thaw cycle, the mould of moving descends 17%.
Comparative example 1
Cement 520kg, sand 900kg, emulsified bitumen 240kg, water 165kg, water reducer PCA-H (Jiangsu Botexin Materials Co., Ltd) 1kg, defoamer DF-201 (Jiangsu Botexin Materials Co., Ltd) 0.9kg, all raw materials respectively in proportion weighing good after, add stirrer and stir 240s fast, stir 60s slowly.The key technical indexes of the CA mortar of making: initial flow degree 97s, divergence 315mm, 30min degree of mobilization 110s, divergence 310mm; Operable time＞60min; Bleeding rate 2.9%; 90d drying shrinkage-0.0784%; 90d rate of self-contraction-0.0327%; Material separation degree 1.4%; 1d ultimate compression strength 3.9MPa, 7d ultimate compression strength 14.9MPa; Behind 56 freeze-thaw cycle, the mould of moving descends 35%.
Claims (10)
1. the composite additive that reduces that can effectively reduce CA mortar bleeding is characterized in that, comprise CaO grog 45%～75% and low temperature calcination MgO25%～55%, described per-cent is mass percent.
2. the composite additive that reduces that can effectively reduce CA mortar bleeding as claimed in claim 1 is characterized in that the calcining temperature of described CaO grog is 1100～1300 ℃, and calcination time is 45min～90min.
3. the composite additive that reduces that can effectively reduce CA mortar bleeding as claimed in claim 1 is characterized in that the specific surface area of described CaO grog is 160m
2/ kg～400m
2/ kg.
4. as claim 1 or the 2 or 3 described composite additives that reduce that can effectively reduce CA mortar bleeding, it is characterized in that described CaO grog is to be to mix in 90: 10～95: 5, calcine behind the grinding and make by Wingdale and composite mineralizer according to mass ratio; Described composite mineralizer is the mixture of at least a and gypsum in copper ashes and the chromium slag, and described gypsum is 50%～70% in the mass content of composite mineralizer.
5. the composite additive that reduces that can effectively reduce CA mortar bleeding as claimed in claim 1 is characterized in that the hydration activity value of described low temperature calcination MgO is 40～90s.
6. the composite additive that reduces that can effectively reduce CA mortar bleeding as claimed in claim 1 is characterized in that the calcining temperature of described low temperature calcination MgO is 700～850 ℃, and calcination time is 40～80min.
7. as claim 5 or the 6 described composite additives that reduce that can effectively reduce CA mortar bleeding, it is characterized in that described low temperature calcination MgO is made by magnesite calcining, MgO content 〉=85% wherein, loss on ignition≤5%, specific surface area is 160m
2/ kg～380m
2/ kg.
8. comprise any described CA mortar drier that reduces composite additive that can effectively reduce CA mortar bleeding of claim 1 to 7.
9. CA mortar drier as claimed in claim 8 is characterized in that, described composite additive shared mass percent in the CA mortar drier that can effectively reduce CA mortar bleeding is 1%～4%.
10. the CA mortar that comprises claim 8 or 9 described CA mortar driers.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110062712 CN102173628B (en) | 2011-03-16 | 2011-03-16 | Shrinkage-reducing compound additive capable of effectively reducing CA (cement and asphalt) mortar bleeding, and CA mortar dry material and CA mortar containing same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110062712 CN102173628B (en) | 2011-03-16 | 2011-03-16 | Shrinkage-reducing compound additive capable of effectively reducing CA (cement and asphalt) mortar bleeding, and CA mortar dry material and CA mortar containing same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102173628A true CN102173628A (en) | 2011-09-07 |
| CN102173628B CN102173628B (en) | 2013-02-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110304871A (en) * | 2019-08-13 | 2019-10-08 | 易树德 | A kind of the CA mortar and its manufacture craft of CRSTII plate-type non-fragment orbit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1821157A (en) * | 2006-02-28 | 2006-08-23 | 湖北国创高科实业集团有限公司 | Composite additive capable of preventing CA mortar laminated segregation |
| CN1821154A (en) * | 2006-02-28 | 2006-08-23 | 武汉理工大学 | Controllable expansion CA mortar material |
| CN101172823A (en) * | 2007-09-30 | 2008-05-07 | 江苏博特新材料有限公司 | Rubber powder modified concrete asphalt mortar |
-
2011
- 2011-03-16 CN CN 201110062712 patent/CN102173628B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1821157A (en) * | 2006-02-28 | 2006-08-23 | 湖北国创高科实业集团有限公司 | Composite additive capable of preventing CA mortar laminated segregation |
| CN1821154A (en) * | 2006-02-28 | 2006-08-23 | 武汉理工大学 | Controllable expansion CA mortar material |
| CN101172823A (en) * | 2007-09-30 | 2008-05-07 | 江苏博特新材料有限公司 | Rubber powder modified concrete asphalt mortar |
Non-Patent Citations (1)
| Title |
|---|
| 《东南大学学报(自然科学版)》 20101130 徐静; 洪锦祥; 刘加平; 万赟; 朱晓斌; 刘至飞 板式无碴轨道垫层CA砂浆研究与进展 56-58 1-10 , 第S2期 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110304871A (en) * | 2019-08-13 | 2019-10-08 | 易树德 | A kind of the CA mortar and its manufacture craft of CRSTII plate-type non-fragment orbit |
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| CN102173628B (en) | 2013-02-13 |
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