CN103739722B - A kind of hydration heat controlled material and preparation method thereof and application - Google Patents
A kind of hydration heat controlled material and preparation method thereof and application Download PDFInfo
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- CN103739722B CN103739722B CN201410010473.XA CN201410010473A CN103739722B CN 103739722 B CN103739722 B CN 103739722B CN 201410010473 A CN201410010473 A CN 201410010473A CN 103739722 B CN103739722 B CN 103739722B
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Abstract
The present invention relates to concrete admixture field, be specifically related to a kind of hydration heat controlled material and preparation method thereof.Have a material for hydration heat adjusting function, its composition is the surface-crosslinked dextrin prepared by crosslinking reaction.The present invention discloses a kind of hydration heat controlled material, and it can significantly regulate and control hydrated cementitious speed, reduces concrete temperature rise, and does not affect concrete middle and later periods intensity.
Description
Technical field
The present invention relates to concrete admixture field, be specifically related to a kind of hydration heat controlled material and preparation method thereof.
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, can cause concrete cracking, and then affect concrete member weather resistance, security.
In order to reduce the temperature variation in concrete, just need 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, and then the temperature rise that reduction concrete causes because of aquation.
[JP3729340B2] discloses a kind of blended material being reduced concrete temperature rise by slag and dextrin recombination energy, and the dextrin wherein used is the commercially available dextrin without any modification, its cold water solubility 10% ~ 30%.But open result shows concrete core temperature reduces amplitude and intensity reduction amplitude scaled versions, although namely this blended material plays the effect of cooling, it makes again concrete strength reduce.
[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.
[JP4905977B2] is although dextrin has certain hydration heat inhibition, think commercially available without modification, solubleness is that the dextrin of 0-80% has good effect, but it has temperature sensitivity, under the condition of high temperature, its hydration heat rejection ability can decline, and time of coagulation is significantly extended, 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.
Summary of the invention
Suppress the various deficiencies existing for material for current reported hydration heat: hydration heat rejection ability is limited, easily cause the problems such as intensity reduction, serious slow setting.The present invention discloses a kind of hydration heat controlled material, and it can significantly regulate and control hydrated cementitious speed, reduces concrete temperature rise, and does not affect concrete middle and later periods intensity.For solving the problem, the present invention's first object is to provide a kind of material with hydration heat adjusting function, and its composition is the surface-crosslinked dextrin prepared by crosslinking reaction.
Applicant studies discovery, by the crosslinked of appropriateness is carried out on dextrin surface, significantly can not only improve the rejection ability (higher than uncrosslinked product) of its hydration heat speed, and all can not affect concrete strength and time of coagulation within the scope of larger volume.Degree of crosslinking and the hydration heat rejection of the finished product can be controlled by the consumption of linking agent.
The present invention's second object is to provide the above-mentioned preparation method with the material of hydration heat adjusting function, there is a preparation method for the material of hydration heat adjusting function, it is characterized in that: the raw material preparing the material of described hydration heat adjusting function comprises dextrin, catalyzer, dispersion medium and linking agent; First described dextrin is dispersed in dispersion medium, then adds linking agent, then adjust ph carrying out crosslinking reaction, after crosslinking reaction, being drying to obtain hydration heat controlled material of the present invention through being separated; Described linking agent is have the polyfunctional compound that can react with hydroxyl in described dextrin molecule; Described dispersion medium is water, acetone or tetrahydrofuran (THF); The quality of described dispersion medium and the mass ratio of described dextrin are (9:1)-(0.6:1); The quality of described linking agent is the 0.01-6% of the quality of described dextrin; Described dextrin granular size is 0.1um-800um; Described dextrin before crosslinking number-average molecular weight is 540-100000g/mol.
The research of applicant finds: the initial number-average molecular weight of the hydration heat ability of regulation and control of final surperficial dextrin and the size of surface-crosslinked degree, dextrin, dextrin is relevant, and also can influence each other between rear three, only have after mutually mating between three, the product obtained just has optimum effect.Result of study shows: 1) if the cross-linking modified front number-average molecular weight of dextrin is less, and its needs select higher degree of crosslinking or large-size, just can make the regulation and control aquation effect that the finished product reach best; 2) if the cross-linking modified front size of dextrin is less, then need larger number-average molecular weight or select high-crosslinking-degree.
Result of study also finds: 1) along with crosslinked dextrin chi more reduces, it also reduces the impact of intensity, but hydration heat rejection ability is the reduction along with particle size, first increases and reduces afterwards.2) along with the increase of dosage of crosslinking agent, hydration heat rejection ability first increases rear reduction; 3) the crosslinked front number-average molecular weight of dextrin is little, and it is comparatively large on the impact of time of coagulation, but can reduce the negative impact of this aspect by increasing degree of crosslinking.4) crosslinked front dextrin number-average molecular weight is larger, and its hydration heat rejection ability first increases rear reduction, and time of coagulation then continues to reduce along with the increase of crosslinked front dextrin number-average molecular weight; 5) unmodified dextrin can make concrete coagulating time significantly extend under high additive, but the inhibition of hydration heat does not promote, and may decline (accelerating after condensation to rise) on the contrary; Crosslinked dextrin increases along with volume improves hydration heat rejection, also less on impact time of coagulation.6) crosslinked dextrin temperature sensitivity is lower, and under high temperature, the change of hydration heat rejection is little, and less on impact time of coagulation.
Comprehensively above-mentioned, the hydration heat controlled material prepared to make the present invention is is significantly regulating and controlling hydrated cementitious speed, concrete middle and later periods intensity is not affected while reducing concrete temperature rise, the add-on of the present inventor to the initial number-average molecular weight of the add-on of linking agent in the present invention, the size of dextrin, dextrin and dispersion agent has carried out reasonable disposition, just reaches effect of the present invention.
The dextrin source that the present invention selects is unrestricted, can be obtained by various starch through acid or enzymatic hydrolysis.The present invention is surface modifying method, namely linking agent is only in dextrin particle surface or top layer reaction, therefore system is heterogeneous suspension system, dextrin is present in dispersion medium with the form of solid powder particle, described dispersion medium is water, acetone or tetrahydrofuran (THF), and the quality of described dispersion medium and the mass ratio of described dextrin are (9:1)-(0.6:1).
As preferably, described linking agent is citric acid mixing vinegar acid anhydrides or epoxy chloropropane; In described citric acid mixing vinegar acid anhydrides, the mass ratio of citric acid and acetic anhydride is 1:30; Described pH value is 9-10; The quality of described dispersion medium and the mass ratio of described dextrin are (3:1)-(1.2:1).
As preferably, described linking agent is formaldehyde; Described pH value is 1-3.
As preferably, described dextrin before crosslinking number-average molecular weight is 1000-50000g/mol; The quality of described linking agent is the 0.02-3% of the quality of described dextrin.
As preferably, described dextrin before crosslinking number-average molecular weight is 2000-30000g/mol; The quality of described linking agent is the 0.04-1% of the quality of described dextrin.
As preferably, described dextrin granular size is 1um-300um.
As preferably, described dextrin granular size is 5um-100um.
The present invention's the 3rd object provides a kind of application of material in concrete with hydration heat adjusting function, and the addition content described in prepared by the present invention with the material of hydration heat adjusting function is the 0.01-3% of gelling material quality in described concrete.
As preferably, the addition content described in prepared by the present invention with the material of hydration heat adjusting function is the 0.05-1.5% of gelling material quality in described concrete.
As preferably, the addition content described in prepared by the present invention with the material of hydration heat adjusting function is the 0.1-0.8% of gelling material quality in described concrete.
The invention has the beneficial effects as follows:
(1) the present invention is by carrying out the crosslinked of appropriateness by dextrin surface, significantly can not only improve the rejection ability of its hydration heat speed, and all can not affect concrete strength and time of coagulation within the scope of larger volume.
(2) preparation method of the present invention is simple, is beneficial to industrialized production.
Embodiment
In order to understand the present invention better, illustrate content of the present invention further below in conjunction with embodiment, but content of the present invention is not restricted to following embodiment.
Following examples have described in more detail prepared according to the methods of the invention hydration heat 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, hydration heat controlled material molecular weight adopts Agilent1200Infinity gel permeation chromatograph to measure.
Adiabatic temperature rise of concrete uses Boyuan Science & Technology Development Co. Ltd., Zhoushan City BY-ATC/JR type thermal insulation warming instrument.Without special instruction in embodiment, during thermal insulation warming test, initial temperature is 15 DEG C.
In the embodiment of the present invention, cement uses hot 42.5 cement in crossdrift; Water-cement ratio 0.45; 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.
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 ".
Embodiment 1
1000g number-average molecular weight is 84000g/mol, is of a size of the dextrin of 700um, adds in 2000g water, adds epoxy chloropropane 0.12g, regulates pH to be 10 with NaOH, is warming up to 45 DEG C of reactions 12 hours, is dried after separation to white powder, i.e. dextrin of the present invention.
Embodiment 2
Except used dextrin is of a size of 100um, other is consistent with embodiment 1.
Embodiment 3
Except used dextrin is of a size of 10um, other is consistent with embodiment 1.
Embodiment 4
Except used dextrin is of a size of 0.50um, other is consistent with embodiment 1.
Comparative example 1
The solubleness that referenced patent [JP4905977B2] is chosen is the commercially available dextrin without any modification of 8%.
Comparative example 2
The solubleness that referenced patent [JP4905977B2] is chosen is the commercially available dextrin without any modification of 12%.
Comparative example 3
The solubleness that referenced patent [JP4905977B2] is chosen is the commercially available dextrin without any modification of 48%.
Comparative example 4
The solubleness that referenced patent [JP4905977B2] is chosen is the commercially available dextrin without any modification of 60%.
Comparative example 5
The solubleness that referenced patent [JP4905977B2] is chosen is the commercially available dextrin without any modification of 75%.
Comparative example 6
The solubleness that referenced patent [JP4905977B2] is chosen is the commercially available dextrin without any modification of 82%.
Comparative example 7
The solubleness that referenced patent [JP4905977B2] is chosen is the commercially available dextrin without any modification of 91%.
Comparative example 8
Except not adding linking agent epoxy chloropropane, other is consistent with embodiment 1.
Comparative example 9
Except not adding linking agent epoxy chloropropane, other is consistent with embodiment 1.
Comparative example 10
Except not adding linking agent epoxy chloropropane, other is consistent with embodiment 1.
Comparative example 11
Except not adding linking agent epoxy chloropropane, other is consistent with embodiment 1.
By embodiment 1 to embodiment 4, dextrin prepared by comparative example 1 to comparative example 11 is incorporated in testing method concrete used according to the incorporation in table one, affects concrete performance to measure the dextrin mixed.Concrete incorporation and to mix rear concrete test performance as shown in table 1.
The incorporation of dextrin in concrete prepared by table 1 embodiment 1 to 4 and comparative example 1 to 11 and the impact on concrete performance thereof
As can be seen from Table 1: after 1) adding surface-crosslinked dextrin, Adiabatic temperature rise of concrete lift velocity reduces; 2) the hydration heat rejection ability of crosslinked rear dextrin is better than not having crosslinked dextrin, and is better than the commercially available dextrin without modification of several different solubilities chosen with reference to patent [JP4905977B2]; 3) dextrin can also reduce the impact on time of coagulation after being cross-linked; 4) embodiment 1 to embodiment 4 can find out that crosslinked dextrin chi is less, less on the impact of intensity, but hydration heat rejection ability is along with the reduction of particle size, first increases and reduces afterwards.
Embodiment 5
1000g number-average molecular weight is 900g/mol, is of a size of the dextrin of 10um, adds in 1500g acetone, adds citric acid mixing vinegar acid anhydrides 50g, regulates pH to be 9 with NaOH, is warming up to 45 DEG C of reactions 8 hours, is dried after separation to white powder.
Embodiment 6
Except used dosage of crosslinking agent is 10g, other is consistent with embodiment 5.
Embodiment 7
Except used dosage of crosslinking agent is 5g, other is consistent with embodiment 5.
Embodiment 8
Except used dosage of crosslinking agent is 0.5g, other is consistent with embodiment 5.
The incorporation of dextrin in concrete prepared by table 2 embodiment 5 to 8 and comparative example 1 and the impact on concrete performance thereof
Table 2 can be found out: 1) along with the reduction of dosage of crosslinking agent, and hydration heat rejection ability first increases rear reduction; 2) embodiment 1 to embodiment 4 in associative list 1, can find out that the crosslinked front number-average molecular weight of dextrin is little, it is comparatively large on the impact of time of coagulation, but can reduce the negative impact of this aspect by increasing degree of crosslinking.
Embodiment 9
1000g number-average molecular weight is 3200g/mol, is of a size of the dextrin of 15um, adds in 1000g tetrahydrofuran (THF), adds formaldehyde 1g, regulates pH to be 2 with HCl, is warming up to 45 DEG C of reactions 5 hours, is dried after separation to white powder.
Embodiment 10
Except used dextrin number-average molecular weight is 8500 for g/mol, other is consistent with embodiment 9.
Embodiment 11
Except used dextrin number-average molecular weight is 21000 for g/mol, other is consistent with embodiment 9.
Comparative example 12
Except the raw material that uses before modified for W-Gum but not dextrin (starch number-average molecular weight average out to 1200000 used, other is consistent with embodiment 9.
Comparative example 13
The concrete of direct interpolation W-Gum.
Comparative example 14
Except not adding linking agent formaldehyde, other is consistent with embodiment 9.
Comparative example 15
Except not adding linking agent formaldehyde, other is consistent with embodiment 10.
Comparative example 16
Except not adding linking agent formaldehyde, other is consistent with embodiment 11.
The incorporation of dextrin in concrete prepared by table 3 embodiment 9 to 11 and comparative example 1 and comparative example 12 to 16 and the impact on concrete performance thereof
Table 3 can be found out: 1) along with crosslinked front dextrin number-average molecular weight increases, hydration heat rejection ability first increases rear reduction, and continues reduction to time of coagulation along with the increase of crosslinked front dextrin number-average molecular weight; 2) surface-crosslinked dextrin hydration heat rejection ability is greater than does not have crosslinked dextrin.
Comparative example 17
Except the volume preparing dextrin is increased to 0.3% by 0.15%, other is identical with comparative example 15.
Comparative example 18
Except the volume preparing dextrin is increased to 0.8% by 0.15%, other is identical with comparative example 15.
Embodiment 12
Except the volume preparing dextrin is increased to 0.3% by 0.15%, other is identical with embodiment 10.
Embodiment 13
Except the volume preparing dextrin is increased to 0.8% by 0.15%, other is identical with embodiment 10.
The incorporation of dextrin in concrete prepared by table 4 embodiment 10, embodiment 12, embodiment 13 and comparative example 1, comparative example 14, comparative example 17 and comparative example 18 and the impact on concrete performance thereof
Table 4 can be found out: 1) unmodified dextrin can make concrete coagulating time significantly extend under high additive, but the inhibition of hydration heat does not promote, and may decline (accelerating after condensation to rise) on the contrary; Crosslinked dextrin increases along with volume improves hydration heat rejection, and time of coagulation, amplification was also much smaller than uncrosslinked dextrin.
Comparative example-19
Except Adiabatic temperature rise of concrete test initial temperature is increased to 35 DEG C by original 15 DEG C, other is identical with comparative example 15.
Embodiment-14
Except Adiabatic temperature rise of concrete test initial temperature is increased to 35 DEG C by original 15 DEG C, other is identical with embodiment 10.
The incorporation of dextrin in concrete prepared by table 5 embodiment 10, embodiment 14 and comparative example 1, comparative example 15 and comparative example 19 and the impact on concrete performance thereof
Table 5 can be found out: crosslinked dextrin temperature sensitivity is lower, and under high temperature, the change of hydration heat rejection is little, and affects time of coagulation hardly.
Claims (10)
1. there is the application of material in concrete for hydration heat adjusting function, it is characterized in that: described in there is the material of hydration heat adjusting function, its composition is the surface-crosslinked dextrin prepared by crosslinking reaction;
The preparation method of described surface-crosslinked dextrin is: raw material comprises dextrin, dispersion medium and linking agent;
First described dextrin is dispersed in dispersion medium, then adds linking agent, then adjust ph carrying out crosslinking reaction, after crosslinking reaction, being drying to obtain hydration heat controlled material through being separated;
Described linking agent is have the polyfunctional compound that can react with hydroxyl in described dextrin molecule;
Described dispersion medium is water, acetone or tetrahydrofuran (THF);
The quality of described dispersion medium and the mass ratio of described dextrin are (9:1)-(0.6:1);
The quality of described linking agent is the 0.01-6% of the quality of described dextrin;
Described dextrin granular size is 0.1 μm-800 μm;
Described dextrin before crosslinking number-average molecular weight is 540-100000g/mol.
2. there is the application of material in concrete of hydration heat adjusting function as claimed in claim 1, it is characterized in that: described linking agent is citric acid mixing vinegar acid anhydrides or epoxy chloropropane; In described citric acid mixing vinegar acid anhydrides, the mass ratio of citric acid and acetic anhydride is 1:30; Described pH value is 9-10; The quality of described dispersion medium and the mass ratio of described dextrin are (3:1)-(1.2:1).
3. there is the application of material in concrete of hydration heat adjusting function as claimed in claim 1, it is characterized in that: described linking agent is formaldehyde; Described pH value is 1-3.
4. there is the application of material in concrete of hydration heat adjusting function as described in any one of Claims 2 or 3, it is characterized in that: described dextrin before crosslinking number-average molecular weight is 1000-50000g/mol; The quality of described linking agent is the 0.02-3% of the quality of described dextrin.
5. there is the application of material in concrete of hydration heat adjusting function as claimed in claim 4, it is characterized in that: described dextrin before crosslinking number-average molecular weight is 2000-30000g/mol; The quality of described linking agent is the 0.04-1% of the quality of described dextrin.
6. there is the application of material in concrete of hydration heat adjusting function as claimed in claim 5, it is characterized in that: described dextrin granular size is 1 μm-300 μm.
7. there is the application of material in concrete of hydration heat adjusting function as claimed in claim 6, it is characterized in that: described dextrin granular size is 5 μm-100 μm.
8. as claim 1,2,3,5,6, there is described in any one in 7 application of material in concrete of hydration heat adjusting function, it is characterized in that: described in there is the material of hydration heat adjusting function addition content be the 0.01-3% of gelling material quality in concrete.
9. there is the application of material in concrete of hydration heat adjusting function as claimed in claim 8, it is characterized in that: described in there is the material of hydration heat adjusting function addition content be the 0.05-1.5% of gelling material quality in concrete.
10. there is the application of material in concrete of hydration heat adjusting function as claimed in claim 9, it is characterized in that: described in there is the material of hydration heat adjusting function addition content be the 0.1-0.8% of gelling material quality in concrete.
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Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104591650A (en) * | 2015-01-12 | 2015-05-06 | 枞阳县天筑新型建筑材料有限公司 | Light-weight inorganic composite concrete and preparation method thereof |
| CN104609769B (en) * | 2015-02-05 | 2017-05-17 | 江苏苏博特新材料股份有限公司 | Cement hydration rate regulating material as well as preparation method and application of cement hydration rate regulating material |
| CN104609766A (en) * | 2015-02-05 | 2015-05-13 | 江苏苏博特新材料股份有限公司 | Cement hydration rate regulating material as well as preparation method and application of cement hydration rate regulating material |
| CN104710131B (en) * | 2015-02-05 | 2017-02-22 | 江苏苏博特新材料股份有限公司 | Cement hydration rate regulation material, and preparation method and application thereof |
| CN104628297B (en) * | 2015-02-05 | 2017-11-03 | 江苏苏博特新材料股份有限公司 | A kind of hydrated cementitious speed controlled material and preparation method and application |
| CN104592403B (en) * | 2015-02-05 | 2017-05-17 | 江苏苏博特新材料股份有限公司 | Hydration heat regulating agent and preparation method and application thereof |
| CN104610503B (en) * | 2015-02-05 | 2017-06-20 | 江苏苏博特新材料股份有限公司 | A kind of cross-linking type heat of hydration adjusting control agent and preparation method and application |
| CN104710132A (en) * | 2015-02-05 | 2015-06-17 | 江苏苏博特新材料股份有限公司 | Cement hydration rate regulating and control material and preparation method and application thereof |
| CN104628296B (en) * | 2015-02-05 | 2017-01-04 | 江苏苏博特新材料股份有限公司 | Composite modified hydration heat regulation and control material and preparation method and application thereof |
| CN106093304B (en) * | 2016-06-08 | 2018-05-04 | 江苏苏博特新材料股份有限公司 | A kind of test method for characterizing heat of hydration controlled material temperature control effect |
| CN108341611B (en) * | 2018-04-16 | 2019-01-01 | 广东水电二局股份有限公司 | A kind of heat of hydration regulatory composition and the preparation method and application thereof |
| CN109680717B (en) * | 2019-01-30 | 2021-03-16 | 武汉市市政建设集团有限公司 | Anti-crack construction method for side wall structure of underground rail transit |
| CN109776022B (en) * | 2019-03-07 | 2021-06-11 | 东南大学 | Composite controllable hydration cement-based material and application thereof |
| CN112551935A (en) * | 2019-09-25 | 2021-03-26 | 中路高科交通检测检验认证有限公司 | Concrete hydration heat inhibiting material and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4302251A (en) * | 1978-11-29 | 1981-11-24 | Denki Kagaku Kogyo Kabushiki Kaisha | Cement composition containing dextrin |
| FR2822647B1 (en) * | 2001-03-30 | 2005-03-04 | Roquette Freres | FIBER ENHANCED BEVERAGES |
| FR2846520B1 (en) * | 2002-11-06 | 2006-09-29 | Roquette Freres | USE OF MALTODEXTRINS BRANCHED AS BLEACHES OF GRANULATION |
| JP4905977B2 (en) * | 2007-06-26 | 2012-03-28 | 電気化学工業株式会社 | Cement admixture and cement composition |
| CN103342494B (en) * | 2013-07-10 | 2015-04-29 | 中国建筑材料科学研究总院 | Hydration heat inhibited concrete expanding material as well as preparation method and applications thereof |
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Denomination of invention: Hydration heat regulating and controlling material as well as preparation method and application thereof Effective date of registration: 20200701 Granted publication date: 20160323 Pledgee: JIANGSU TESTING CENTER FOR QUALITY OF CONSTRUCTION ENGINEERING Co.,Ltd. Pledgor: JIANGSU SUBOTE NEW MATERIALS Co.,Ltd. Registration number: Y2020980003669 |
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