CN101701925A - Method for measuring influence of different solid phase components on heat expansion coefficients of set cements - Google Patents
Method for measuring influence of different solid phase components on heat expansion coefficients of set cements Download PDFInfo
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- CN101701925A CN101701925A CN200910232706A CN200910232706A CN101701925A CN 101701925 A CN101701925 A CN 101701925A CN 200910232706 A CN200910232706 A CN 200910232706A CN 200910232706 A CN200910232706 A CN 200910232706A CN 101701925 A CN101701925 A CN 101701925A
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Abstract
The invention discloses a method for measuring the influence of different solid phase components on heat expansion coefficients of set cements, comprising the following steps of: sealing surfaces of different solid phase components with the same specific surface area by adopting silicone oil; then mixing the sealed solid phase components and cement in a test design ratio; mixing into a neat cement paste under the condition of the same water/binder ratio and molding and curing; measuring the heat expansion coefficients of dry set cement samples at test design age; and contrasting the influence of different solid phase components on the heat expansion performance of the set cement according to measuring results of the heat expansion coefficients of the set cement samples to which different solid phase components are added. The influence of several tested solid phase components on the heat expansion performance of the set cements has the following relation: Ca(OH)2>flyash>cement clinker particle>slag>CSH gel.
Description
Technical field
The invention belongs to the material applied technical field, relate to the measuring method of a kind of different solid phase components the influence of cement stone hot expansibility.
Background technology
Along with the development of concrete technology, large volume and super-long structural occur now and then.In this class concrete, because hydration heat and various environmental radiation heat cause the concrete internal temperature inequality, produce differential expansion stress, when differential expansion stress during, can cause the appearance of thermal cracking greater than concrete tensile strength, have a strong impact on the xoncrete structure performance.So fully grasp concrete hot expansibility, for the size of the concrete temperature deformation of accurate calculating, instruct structural design, the permanance etc. that improves xoncrete structure has crucial meaning.
Concrete is a kind of compound substance that is made of coarse-fine aggregate and cement stone, so the thermal expansivity of coarse-fine aggregate and cement stone and content thereof determine concrete thermal expansivity.When the kind of aggregate and the content in concrete thereof are determined, the thermal expansivity of cement stone will directly influence concrete thermal expansivity.Kind and the content thereof of forming the solid phase components of cement stone are influence its thermal expansivity greatest factor, so accurately measure different solid phase components the influence of cement stone hot expansibility are had crucial meaning for studying concrete thermal expansivity and mechanism thereof.
Measuring different solid phase components at present mainly contains the method that cement stone hot expansibility influences:
1) flyash is to the method for testing that influences of cement stone hot expansibility
Under identical water cement ratio condition, adjust the consumption that flyash replaces cement, mix system cement paste and moulding cement stone sample, after extremely certain length of time of the indoor maintenance sample of standard curing and drying, adopt the instrumented dilatometer to measure the length of different test specimens under different temperatures, calculate the thermal expansivity of each test specimen according to the linear measure longimetry result.
Adopt the method to measure the influence of flyash to heat expansion coefficients of set cements, because mixing part flyash in the cement reacts with alkaline matter that hydrated cementitious produces in the hydration process of cement, generate a certain amount of hydraulicity material, The ultimate results reaction be the influence of the product of part flyash generation pozzolanic reaction and flyash that another part does not react to heat expansion coefficients of set cements.Measurement result can not fully be reacted the direct influence of whole flyash of admixture to cement stone hot expansibility.
2) fiber is to the method for testing that influences of cement stone hot expansibility
Under identical water cement ratio and gel material content condition, adjust the volume of fiber in cement stone, the system of mixing contains the cement paste and the moulding cement stone sample of fiber, after oven dry in the length of time is set in the indoor maintenance sample of standard curing to experiment, adopt the instrumented dilatometer to measure the length of different test specimens under different temperatures, according to the linear measure longimetry result of same test specimen under condition of different temperatures, calculate the thermal expansivity of each test specimen.Adopt the method to measure the influence of fibers content, because the fiber that mixes in the cement does not participate in chemical reaction in cement hydration process, so The ultimate results can fully be reacted the influence of fiber to heat expansion coefficients of set cements to heat expansion coefficients of set cements.But fiber is the composition that adds in the cement stone, is not the intrinsic composition of cement stone self.
More than measure the method for solid phase components to the influence of cement stone hot expansibility, after can not embodying hydrated reaction of cement and finishing, the various solid phase compositions that cement stone contains self (comprise CSH gel, Ca (OH) that hydrated cementitious produces
2, and unhydrated cement clinker, flyash and slag particle in the cement stone) to the influence of cement stone hot expansibility.Measure the influence of cement stone self component and content thereof, must consider new method its hot expansibility.
Summary of the invention
The present invention is directed to the solid phase composition that can not the reaction water mudstone self be contained that exists in the above-mentioned measuring method problem to the influence of its hot expansibility, the measuring method of a kind of different solid phase components to the influence of cement stone hot expansibility is provided, measuring process is simple to operate, the measuring accuracy height.
Technical scheme of the present invention is: a kind of different solid phase components is to the measuring method of heat expansion coefficients of set cements influence, adopt silicone oil different types of solid phase components surface that specific surface area is identical to carry out encapsulation process, the solid phase components that to handle mixes in the experimental design ratio with cement afterwards, under identical water-cement ratio condition, mix and make cement paste and blanks and moulding and conserving, measure the thermal expansivity of dry cement stone test specimen the length of time in experimental design, according to the influence of the measurement result contrast different solid phase components of the cement stone test specimen thermal expansivity that adds different solid phase compositions to cement stone hot expansibility.
Described different solid phase components is to the measuring method of heat expansion coefficients of set cements influence, and concrete test process is as follows:
The first step, respectively that specific surface area is identical solid phase components is dried to constant weight, joins 1.5～2.5 times and stir, filter oven dry again in the silicone oil of solid phase components quality;
Second step, to fully mix in the experimental design ratio with cement respectively through first step surface-treated solid phase components, under the water-cement ratio condition of requirement of experiment, mix the system cement paste, the cement paste that will contain different solid phase components afterwards is shaped to the test specimen of unified size, becomes cement stone in the indoor maintenance of standard curing;
The 3rd step, the cement stone sample that takes out the preparation of second step in experiment the predetermined length of time is dried to constant weight, again the sample of drying is put into dilatometer respectively, at heating rate is under 1 ℃/40s～1 ℃/60s condition, measure temperature and be respectively that each contains the length and the record of the sample of different solid phase components under 0 ℃, 40 ℃, 50 ℃, 60 ℃, 70 ℃, the 80 ℃ conditions, calculate the thermal expansivity of the cement stone that contains different solid phase components according to measurement result;
The 4th step contrasted the size of the thermal expansivity of the cement stone that contains different solid phase components, thereby judged the influence of different solid phase components to heat expansion coefficients of set cements.
Described solid phase components is cement clinker, flyash, slag, CSH gel, Ca (OH)
2Particle.
Beneficial effect:
(1) silicone oil is effective to the face seal of various solid phase particles, can successfully stop various solid phase compositions to participate in various chemical reactions in cement stone forming process.
(2) contrasted various solid phase compositions to cement stone hot expansibility to influence magnitude relationship as follows: Ca (OH)
2＞flyash＞cement clinker particle＞slag＞CSH gel.
Description of drawings
Carry out surface-treated cement clinker particle with silicone oil in Fig. 1 cement stone.
The energy spectrum analysis of Fig. 2 cement clinker particle surface.
Carry out surface-treated fly ash grain with silicone oil in Fig. 3 cement stone.
The energy spectrum analysis on Fig. 4 fly ash grain surface.
The thermal expansivity of the cement stone of Fig. 5 admixture different solid phase components.
Embodiment
Below in conjunction with accompanying drawing the present invention is made and to specify.
Embodiment 1
A kind of method of measuring different solid phase components to the heat expansion coefficients of set cements influence, concrete test process is as follows:
1) respectively that specific surface area is identical cement clinker, flyash, slag, CSH gel, Ca (OH)
2Particle is dried to constant weight in 100 ℃ of baking ovens, join 2 times and in the silicone oil of powdered granule quality, fully stir 5min, afterwards potpourri is filtered, in 100 ℃ of baking ovens, dried 1 hour again, make silicone oil can fully cover the powdered granule surface, make through silicone oil surface-treated particle and ambient substance and effectively isolate, avoid in cement hydration process, reacting with water or alkaline matter.
2) be fully to mix at 1: 4 by weight with surface treated solid phase components and cement, be the different cement paste of the system of mixing under 0.4 condition at water-cement ratio, afterwards with different cement pastes moulding moulded be the test specimen of Φ 7mm * 60mm, become cement stone in the indoor maintenance of standard curing.
3) taking out cement stone sample in the predetermined length of time puts into 100 ℃ of baking ovens and dries to constant weight, again the sample of drying is put into dilatometer, at heating rate is under 1 ℃/40s～1 ℃/60s condition, measure length and record that temperature is respectively sample under 30 ℃, 40 ℃, 50 ℃, 60 ℃, 70 ℃, the 80 ℃ conditions, calculate the thermal expansivity of different cement stones according to measurement result.
4) size of the thermal expansivity of the different cement stones of contrast, thus judge that different solid phase components influences cement stone hot expansibility.
Fig. 1 carries out surface-treated cement clinker particle with silicone oil in the cement stone.Can see by Fig. 1, carry out surface-treated cement clinker particle profile still for random particle shape, hydration reaction does not take place, also not link to each other with on every side hydrated product with silicone oil.This explanation silicone oil is to the favorable sealing property of cement clinker particle, and prevention cement clinker particle that can be successful contacts with outside moisture, effectively avoids active very high cement clinker particle generation hydration reaction.
Fig. 2 is the energy spectrum analysis of cement clinker particle surface.The EDAX results that is marked a little by Fig. 2 shows, content height at this Ca, Si, and 0 content is lower, further confirms this point for the cement clinker particle of hydration reaction not to take place on chemical constitution, thereby further proves the favorable sealing property of silicone oil to the cement clinker particle.
Fig. 3 carries out surface-treated fly ash grain with silicone oil in the cement stone.Can see that by Fig. 3 carry out surface-treated fly ash grain profile still for spherical with silicone oil, although in the fly ash grain surface attachment a small amount of aquation product is arranged, hydration reaction does not take place fly ash grain self.Thereby the favorable sealing property of silicone oil to fly ash grain is described, prevention fly ash grain that can be successful contacts with outside moisture and alkaline matter, avoids flyash generation pozzolanic reaction.
Fig. 4 is the energy spectrum analysis on fly ash grain surface.The EDAX results that is marked a little by Fig. 4 shows that very high at this Si content, Ca content is relatively low, further confirms this point for the fly ash grain of hydration reaction not to take place, thereby further proves the favorable sealing property of silicone oil to fly ash grain.
Fig. 5 is the thermal expansivity of the cement stone of admixture different solid phase components.As shown in Figure 5, there is following relation: Ca (OH) in several solid phase components of being tested to the influence of cement stone hot expansibility
2＞flyash＞cement clinker particle＞slag＞CSH gel.
A kind of method of measuring different solid phase components to the heat expansion coefficients of set cements influence, concrete test process is as follows:
1) respectively that specific surface area is identical cement clinker, flyash, slag, CSH gel, Ca (OH)
2Particle is dried to constant weight in 100 ℃ of baking ovens, join 2.5 times and in the silicone oil of powdered granule quality, fully stir 10min, afterwards potpourri is filtered, in 100 ℃ of baking ovens, dried 1.5 hours again, make silicone oil can fully cover the powdered granule surface, make through silicone oil surface-treated particle and ambient substance and effectively isolate, avoid in cement hydration process, reacting with water or alkaline matter.
2) be fully to mix at 1: 5 by weight with surface treated solid phase components and cement, be the different cement paste of the system of mixing under 0.35 condition at water-cement ratio, afterwards with different cement pastes moulding moulded be the test specimen of Φ 7mm * 60mm, become cement stone in the indoor maintenance of standard curing.
3) taking out cement stone sample in the predetermined length of time puts into 100 ℃ of baking ovens and dries to constant weight, again the sample of drying is put into dilatometer, at heating rate is under 1 ℃/40s～1 ℃/60s condition, measure length and record that temperature is respectively sample under 30 ℃, 40 ℃, 50 ℃, 60 ℃, 70 ℃, the 80 ℃ conditions, calculate the thermal expansivity of different cement stones according to measurement result.
4) size of the thermal expansivity of the different cement stones of contrast, thus judge that different solid phase components influences cement stone hot expansibility.
Claims (3)
1. a different solid phase components is to the measuring method of heat expansion coefficients of set cements influence, it is characterized in that, adopt silicone oil different types of solid phase components surface that specific surface area is identical to carry out encapsulation process, the solid phase components that to handle mixes in the experimental design ratio with cement respectively afterwards, under identical water-cement ratio condition, mix and make cement paste and blanks and moulding and conserving, measure the thermal expansivity of dry cement stone test specimen the length of time respectively in experimental design, according to the influence of the measurement result contrast different solid phase components of the cement stone test specimen thermal expansivity that adds different solid phase compositions to cement stone hot expansibility.
2. different solid phase components as claimed in claim 1 is characterized in that to the measuring method of heat expansion coefficients of set cements influence concrete test process is as follows:
The first step, respectively that specific surface area is identical solid phase components is dried to constant weight, joins 1.5～2.5 times and stir, filter oven dry again in the silicone oil of solid phase components quality;
Second step, to fully mix in the experimental design ratio with cement respectively through first step surface-treated solid phase components, under the water-cement ratio condition of requirement of experiment, mix the system cement paste, the cement paste that will contain different solid phase components afterwards is shaped to the test specimen of unified size, becomes cement stone in the indoor maintenance of standard curing;
The 3rd step, the cement stone sample that takes out the preparation of second step in experiment the predetermined length of time is dried to constant weight, again the sample of drying is put into dilatometer respectively, at heating rate is under 1 ℃/40s～1 ℃/60s condition, measure temperature and be respectively that each contains the length and the record of the sample of different solid phase components under 0 ℃, 40 ℃, 50 ℃, 60 ℃, 70 ℃, the 80 ℃ conditions, calculate the thermal expansivity of the cement stone that contains different solid phase components according to measurement result;
The 4th step contrasted the size of the thermal expansivity of the cement stone that contains different solid phase components, thereby judged the influence of different solid phase components to heat expansion coefficients of set cements.
3. different solid phase components as claimed in claim 1 is characterized in that to the measuring method of heat expansion coefficients of set cements influence described solid phase components is cement clinker, flyash, slag, CSH gel, Ca (OH)
2Particle.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104050385A (en) * | 2014-06-27 | 2014-09-17 | 南京工程学院 | Method for building model for forecasting thermal expansion coefficient of cement mortar |
| CN108181346A (en) * | 2017-12-21 | 2018-06-19 | 中国水利水电科学研究院 | Fully graded concrete scene autogenous volumetric deformation and linear expansion coefficient monitoring device and method |
| CN113155891A (en) * | 2021-02-26 | 2021-07-23 | 华润水泥技术研发有限公司 | Method for measuring thermal expansion coefficient of fine aggregate |
| CN118169173B (en) * | 2024-05-16 | 2024-07-02 | 太原理工大学 | Method for determining mineral components based on rock thermal expansion coefficient |
-
2009
- 2009-11-27 CN CN200910232706A patent/CN101701925A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104050385A (en) * | 2014-06-27 | 2014-09-17 | 南京工程学院 | Method for building model for forecasting thermal expansion coefficient of cement mortar |
| CN108181346A (en) * | 2017-12-21 | 2018-06-19 | 中国水利水电科学研究院 | Fully graded concrete scene autogenous volumetric deformation and linear expansion coefficient monitoring device and method |
| CN113155891A (en) * | 2021-02-26 | 2021-07-23 | 华润水泥技术研发有限公司 | Method for measuring thermal expansion coefficient of fine aggregate |
| CN113155891B (en) * | 2021-02-26 | 2022-11-29 | 华润水泥技术研发有限公司 | Method for measuring thermal expansion coefficient of fine aggregate |
| CN118169173B (en) * | 2024-05-16 | 2024-07-02 | 太原理工大学 | Method for determining mineral components based on rock thermal expansion coefficient |
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