CN104609766A - Cement hydration rate regulating material as well as preparation method and application of cement hydration rate regulating material - Google Patents
Cement hydration rate regulating material as well as preparation method and application of cement hydration rate regulating material Download PDFInfo
- Publication number
- CN104609766A CN104609766A CN201510061600.3A CN201510061600A CN104609766A CN 104609766 A CN104609766 A CN 104609766A CN 201510061600 A CN201510061600 A CN 201510061600A CN 104609766 A CN104609766 A CN 104609766A
- Authority
- CN
- China
- Prior art keywords
- dextrin
- hydrated cementitious
- controlled material
- molecular weight
- cement hydration
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
The invention provides a cement hydration rate regulating material which is dextrin modified by using an alkylene oxide modifier. The cement hydration rate regulating material is simple in preparation process and low in cost; the cement hydration rate regulating performance of the cement hydration rate regulating material is greatly improved as comparison with that of the prior art; and the peak value of the maximum heat release rate for cement hydration can be reduced by more than 80%.
Description
Technical field
The invention belongs to concrete admixture field, be specifically related to a kind of hydrated cementitious speed controlled material and preparation method thereof and application.
Background technology
Hydrated cementitious can release a large amount of heat, and when in concrete, hydrated cementitious institute liberated heat has little time to shed, concrete internal temperature will raise, and further hydration stops, and concrete temperature can be down to again envrionment temperature; This temperature variation can cause volume of concrete to change, and under affined condition, when the tensile stress that temperature deformation is formed exceedes concrete tensile strength, will cause the formation of thermal cracking.In order to reduce thermal cracking, must reduce concrete temperature rise, therefore needing to regulate and control the hydration process of cement, reduce the hydration rate of cement acceleration period as far as possible, the heat that hydrated cementitious is produced does not concentrate release, for concrete heat radiation is raced against time.
Patent EP1233008A1 discloses a kind of swelling agent material containing dextrin, adopt commercially available without any modification, cold water solubility lower than 70% dextrin for suppressing hydration heat, disclosed result shows it and makes concrete temperature reduced by only 1 DEG C, poor effect.
Patent CN201410010473 discloses a kind of hydration heat controlled material and preparation method thereof and application: the surface crosslinking agent dextrin that it uses, and after result display is crosslinked, effect has a certain upgrade, but effect also deposits deficiency.
Patent CN201410009447 discloses a kind of moderate-heat portland cement Hydration controlled material, it is made up of dextrin, modified dextrins and oleic acid, the proportioning of disclosed result display optimum can reduce hydrated cementitious maximum rate peak value 66.3%, but it prepared also more complicated.
Although the open dextrin of patent JP4905977B2 has certain hydration heat inhibition, it has temperature sensitivity, and under the condition of high temperature, its hydration heat rejection ability can decline, and time of coagulation is significantly extended, and intensity reduces.
Dextrin shows as out the effect similar to traditional small molecules carbohydrate retardant under high additive, namely mainly increase concrete coagulating time, and the ability reducing the hydration rate of cement weakens on the contrary.
In sum, although dextrin mentioned by existing patent documentation certain hydration rate adjusting function, dextrin is amylolytic intermediate product, of a great variety, not every dextrin all has outstanding aquation adjusting function, and in disclosed result aquation performance of control also limited.
Summary of the invention
Goal of the invention: in order to overcome above-mentioned the deficiencies in the prior art, the object of the present invention is to provide a kind of hydrated cementitious controlled material.
Technical scheme:
Applicant is found by large quantity research:
First, dextrin can effectively reduce hydrated cementitious speed, essential reason is: dextrin forms one deck adsorption layer at cement particle surface, this layer of adsorption layer reduces the speed of moisture by export-oriented cement granules internal migration, and then result in hydration rate reduction, and the stability of this layer of adsorption layer, thickness are relevant to dextrin molecular weight, too low molecular weight, adsorption site is easy desorption less, reduces the obstructing capacity of adsorption layer; Too high molecular weight again reduces saturated adsorption rate, and adsorption efficiency is reduced.
The second, dextrin has sugar unit to form, and its repeating unit sugar has a large amount of sugared hydroxyls, and sugared hydroxyl easily causes slow setting, mentions as inside background technology, shows the characteristic of similar conventional set retarder under dextrin high additive condition; In order to reduce the impact of dextrin on inductive phase, propose the quantity removing to reduce sugared hydroxyl with appropriate properties-correcting agent, destroy sugar unit conformation, reduce the complexing of hydroxyl and the crucial ion of the hydrated cementitious such as calcium, silicon on dextrin molecular chain, and then reduce, avoid it on the impact of aquation inductive phase even completely, but can greatly improve controlled material to aquation acceleration period and deceleration phase aquation rejection ability.
Therefore to obtain the aquation controlled material of excellent performance, must control hydroxyl quantity sugared in molecular weight of product, molecular chain.Hydroxyl and alkylene oxides compound on dextrin molecular chain is utilized to react, although this reaction can not make hydroxy number reduce, but it destroys the conformation of sugared hydroxyl in dextrin molecular chain, the complex ability of dextrin and the crucial ion of the hydrated cementitious such as calcium, silicon is reduced, and then reduces dextrin to the impact of inductive phase.
A kind of hydrated cementitious controlled material provided by the invention is the dextrin of alkylene oxides modifier modification.
As preferably, the number-average molecular weight of described dextrin is 1000-150000g/mol; Preferably, its number-average molecular weight is 2000-100000g/mol; More preferably, its number-average molecular weight is 5000-60000g/mol.The present invention can use various dextrin, and its source is unrestricted, and can be obtained through acid or enzymatic hydrolysis by various starch, preparation method can with reference to documents and materials disclosed in this area; The cold water-soluble of dextrin is unrestricted, can be the white dextrin of incomplete cold water solubles, also can be consoluet yellow starch gum or maltodextrin.
Preferred as another kind, described alkylene oxides properties-correcting agent is oxyethane, propylene oxide or butylene oxide ring.
Preferred as another kind, the quality of described alkylene oxides properties-correcting agent is the 0.2-40% of dextrin quality, preferred 1-20%.
Hydrated cementitious controlled material of the present invention reacts obtained by alkylene oxides properties-correcting agent and dextrin, be specially: choose the dextrin that molecular weight is moderate, and be obtained by reacting required product based on epoxide group on dextrin self hydroxyl and alkylene oxides compound, wherein the reaction method of epoxy compounds and hydroxyl can with reference to documents and materials disclosed in this area.
Present invention also offers the application of above-mentioned hydrated cementitious controlled material in concrete, be specially: the volume (consumption relative to glue material) of described hydrated cementitious controlled material is 0.05-3%, preferred 0.1-2%, more preferably 0.15-1%.
Beneficial effect: hydrated cementitious controlled material preparation technology provided by the invention is simple, with low cost, and it has very large lifting to hydrated cementitious speed performance of control relative to prior art, can reduce hydrated cementitious maximum heatrelease rate peak value more than 80%.Simultaneously, this hydration rate controlled material impact on the aquation of cement is different from traditional small molecules retardant, the inductive phase impact of this controlled material on aquation is less even not to be affected, but significantly can reduce the hydration rate of acceleration period and deceleration phase, and traditional small molecules retardant mainly extends hydrated cementitious inductive phase, and on the hydration rate of hydrated cementitious acceleration period and deceleration phase substantially without impact (see Fig. 1).
Accompanying drawing explanation
Fig. 1 is the affecting laws (TAM AIR isothermal calorimeter is tested and obtained) that hydrated cementitious speed controlled material of the present invention is different to hydrated cementitious from conventional set retarder (sucrose).
Embodiment
Following examples have described in more detail prepared according to the methods of the invention hydrated cementitious speed controlled material and performance thereof, and these embodiments provide by way of illustration, but these embodiments do not limit the scope of the invention.
In the embodiment of the present invention, molecular weight adopts Agilent 1200 Infinity gel permeation chromatograph to measure.
The monitoring of hydrated cementitious exothermic process adopts U.S. TA company's T AM AIR isothermal calorimeter, and probe temperature is 20 DEG C, and test test specimen be only starch, and water-cement ratio is 0.4, and the interpolation per-cent of hydrated cementitious speed controlled material is relative to the material of glue material.The criterion of amplitude as aquation controlled material performance of the present invention is reduced using maximum heatrelease rate peak value, under the same terms peak heat release rates to reduce amplitude larger, show that hydrated cementitious speed controlled material performance is better, more can avoid the concentrated heat release of hydrated cementitious.
Concrete crushing strength performs with reference to GB/T50081-2002 " standard for test methods of mechanical properties of ordinary concrete "; Concrete coagulating time performs with reference to GB/T50080-2002 " Standard for test methods of properties of ordinary concrete mixture standard ".
In the embodiment of the present invention, concrete mix is as shown in table 1.Wherein, cement uses little wild field 52.5 cement; First level flour coal ash; Fine aggregate is river sand, apparent density 2.63g/cm3, and fineness modulus is 2.60; Coarse aggregate is that rubble is joined in the continuous pole of 5 ~ 20mm.
Table 1.1 concrete foundation proportioning (kg/m
3)
Embodiment 1
100g number-average molecular weight is the dextrin of 150000g/mol, joins in 200ml acetone, then adds 2.5g NaOH, and then pass into 10g oxyethane, under 40 DEG C of conditions, react 20h, with in hydrochloric acid and after, after filtration, dry, pulverize and obtain required aquation controlled material.
Embodiment 2
Except dextrin number-average molecular weight is 100000g/mol, other is identical with embodiment 1.
Embodiment 3
Except dextrin number-average molecular weight is 60000g/mol, other is identical with embodiment 1.
Embodiment 4
Except dextrin number-average molecular weight is 10000g/mol, other is identical with embodiment 1.
Embodiment 5
Except dextrin number-average molecular weight is 5000g/mol, other is identical with embodiment 1.
Embodiment 6
Except dextrin number-average molecular weight is 2000g/mol, other is identical with embodiment 1.
Embodiment 7
Except dextrin number-average molecular weight is 1000g/mol, other is identical with embodiment 1.
Comparative example 1
Do not add clean slurry, the concrete of any admixture.
Comparative example 2
Number-average molecular weight is the dextrin of 150000g/mol.
Comparative example 3
Number-average molecular weight is the dextrin of 100000g/mol.
Comparative example 4
Number-average molecular weight is the dextrin of 60000g/mol.
Comparative example 5
Number-average molecular weight is the dextrin of 10000g/mol.
Comparative example 6
Number-average molecular weight is the dextrin of 5000g/mol.
Comparative example 7
Number-average molecular weight is the dextrin of 2000g/mol.
Comparative example 8
Number-average molecular weight is the dextrin of 1000g/mol.
Comparative example 9
[CN201410009447] disclosed result 0.2% volume, aquation maximum rate peak value reduces by 62.4%.
The hydrated cementitious speed controlled material of embodiment 1 to 7 is added in concrete, the results are shown in Table 1.
Table 1 concrete performance
Embodiment 8
100g number-average molecular weight is the dextrin of 30000g/mol, joins in 200ml water, then adds 40g sodium sulfate, 1.5g NaOH, and then pass into 0.2g oxyethane, under 40 DEG C of conditions, react 20h, with in hydrochloric acid and after, after filtration, dry, pulverize and obtain required aquation controlled material.
Embodiment 9
Except oxyethane quality is 1g, other is identical with embodiment 8.
Comparative example 10
Number-average molecular weight is the dextrin of 30000g/mol.
The hydrated cementitious speed controlled material of embodiment 8-9 is added in concrete, the results are shown in Table 2.
Table 2 concrete performance
Embodiment 10
100g number-average molecular weight is the dextrin of 10000g/mol, joins in 200ml acetone, then adds 2.5g NaOH, and then pass into 20g oxyethane, under 40 DEG C of conditions, react 20h, with in hydrochloric acid and after, after filtration, dry, pulverize and obtain required aquation controlled material.
Embodiment 11
Except oxyethane quality is 40g, other is identical with embodiment 10.
Embodiment 12
100g number-average molecular weight is the dextrin of 10000g/mol, joins in 200ml acetone, then adds 2.5g NaOH, and then pass into 20g propylene oxide, under 40 DEG C of conditions, react 20h, with in hydrochloric acid and after, after filtration, dry, pulverize and obtain required aquation controlled material.
Embodiment 13
100g number-average molecular weight is the dextrin of 10000g/mol, joins in 200ml acetone, then adds 2.5g NaOH, and then pass into 20g butylene oxide ring, under 40 DEG C of conditions, react 20h, with in hydrochloric acid and after, after filtration, dry, pulverize and obtain required aquation controlled material.
The hydrated cementitious speed controlled material of embodiment 11-13 is added in concrete, the results are shown in Table 3.
Table 3 concrete performance
Claims (5)
1. a hydrated cementitious controlled material, is characterized in that: described hydrated cementitious controlled material is the dextrin of alkylene oxides modifier modification.
2. a kind of hydrated cementitious controlled material according to claim 1, is characterized in that: the number-average molecular weight of described dextrin is 1000-150000g/mol; Preferably, its number-average molecular weight is 2000-100000g/mol; More preferably, its number-average molecular weight is 5000-60000g/mol.
3. a kind of hydrated cementitious controlled material according to claim 1, is characterized in that: described alkylene oxides properties-correcting agent is oxyethane, propylene oxide or butylene oxide ring.
4. a kind of hydrated cementitious controlled material according to claim 1, is characterized in that: the quality of described alkylene oxides properties-correcting agent is the 0.2-40% of dextrin quality, preferred 1-20%.
5. the application of hydrated cementitious controlled material in concrete described in any one of claim 1-4, is characterized in that: the volume of described hydrated cementitious controlled material is 0.05-3%, preferred 0.1-2%, more preferably 0.15-1%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510061600.3A CN104609766A (en) | 2015-02-05 | 2015-02-05 | Cement hydration rate regulating material as well as preparation method and application of cement hydration rate regulating material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510061600.3A CN104609766A (en) | 2015-02-05 | 2015-02-05 | Cement hydration rate regulating material as well as preparation method and application of cement hydration rate regulating material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104609766A true CN104609766A (en) | 2015-05-13 |
Family
ID=53144459
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510061600.3A Pending CN104609766A (en) | 2015-02-05 | 2015-02-05 | Cement hydration rate regulating material as well as preparation method and application of cement hydration rate regulating material |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104609766A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109776022A (en) * | 2019-03-07 | 2019-05-21 | 东南大学 | The compound controllable heat of hydration cement-based material of one kind and its application |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1233008A1 (en) * | 2001-02-19 | 2002-08-21 | Denki Kagaku Kogyo Kabushiki Kaisha | Cement admixture and cement composition |
| CN103288375A (en) * | 2013-05-30 | 2013-09-11 | 河海大学 | Concrete additive and preparation method thereof |
| CN103739722A (en) * | 2014-01-10 | 2014-04-23 | 江苏苏博特新材料股份有限公司 | Hydration heat regulating and controlling material as well as preparation method and application thereof |
| CN104098288A (en) * | 2013-12-09 | 2014-10-15 | 江苏苏博特新材料股份有限公司 | Concrete hydration heat inhibition material |
-
2015
- 2015-02-05 CN CN201510061600.3A patent/CN104609766A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1233008A1 (en) * | 2001-02-19 | 2002-08-21 | Denki Kagaku Kogyo Kabushiki Kaisha | Cement admixture and cement composition |
| CN103288375A (en) * | 2013-05-30 | 2013-09-11 | 河海大学 | Concrete additive and preparation method thereof |
| CN104098288A (en) * | 2013-12-09 | 2014-10-15 | 江苏苏博特新材料股份有限公司 | Concrete hydration heat inhibition material |
| CN103739722A (en) * | 2014-01-10 | 2014-04-23 | 江苏苏博特新材料股份有限公司 | Hydration heat regulating and controlling material as well as preparation method and application thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109776022A (en) * | 2019-03-07 | 2019-05-21 | 东南大学 | The compound controllable heat of hydration cement-based material of one kind and its application |
| CN109776022B (en) * | 2019-03-07 | 2021-06-11 | 东南大学 | Composite controllable hydration cement-based material and application thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103739722B (en) | A kind of hydration heat controlled material and preparation method thereof and application | |
| CN108046650B (en) | Cement synergist | |
| CN106915915A (en) | A kind of concrete admixture and its application | |
| CN111646773B (en) | Preparation method of lithium slag concrete | |
| CN109796146A (en) | A kind of hydrated cementitious controlled material and its preparation method and application | |
| CN115321895B (en) | Corrosion-resistant concrete and preparation method thereof | |
| CN108314054A (en) | A method of preparing microporous calcium silicate powder | |
| CN115028416B (en) | Low-shrinkage concrete using industrial waste residues and preparation method thereof | |
| CN112939528A (en) | Underwater low-bleeding concrete and preparation method thereof | |
| CN105254228A (en) | Mortar with high salt water resistance for air-entrapping brick | |
| CN104609767A (en) | Cement hydration rate regulating material as well as preparation method and application of cement hydration rate regulating material | |
| CN108529992A (en) | A kind of high-Miller-index surface and preparation method thereof | |
| CN103833259B (en) | A kind of moderate-heat portland cement Hydration controlled material | |
| CN104609766A (en) | Cement hydration rate regulating material as well as preparation method and application of cement hydration rate regulating material | |
| CN110423035A (en) | A kind of powder hydrated calcium silicate early strength agent and preparation method thereof | |
| CN104628297A (en) | Cement hydration rate regulating material as well as preparation method and application thereof | |
| CN105039461A (en) | Preparation method of starch-base hydration heat regulating and controlling material | |
| CN104710131A (en) | Cement hydration rate regulation material, and preparation method and application thereof | |
| CN107721332A (en) | The production method of cement for construction in sea building mortar | |
| CN105152561B (en) | The method that gypsum plaster water reducer is prepared using spent pulping liquor | |
| CN104609768B (en) | A kind of hydrated cementitious speed controlled material and preparation method and application | |
| CN108516741B (en) | Steel slag sand-straw ash composite doping mortar and preparation method thereof | |
| CN106830831A (en) | The Plant Containing Kind of Ecological Soil of warping resistance high | |
| CN104609769A (en) | Cement hydration rate regulating material as well as preparation method and application of cement hydration rate regulating material | |
| CN107417292B (en) | Preparation method of lime-sand brick |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150513 |
|
| WD01 | Invention patent application deemed withdrawn after publication |