CN110186954A - A kind of analysis method of the low adiabatic temperature rise concrete of high intensity and its thermal insulation temperature rise - Google Patents
A kind of analysis method of the low adiabatic temperature rise concrete of high intensity and its thermal insulation temperature rise Download PDFInfo
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- CN110186954A CN110186954A CN201910461615.7A CN201910461615A CN110186954A CN 110186954 A CN110186954 A CN 110186954A CN 201910461615 A CN201910461615 A CN 201910461615A CN 110186954 A CN110186954 A CN 110186954A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
- G01N25/48—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity on solution, sorption, or a chemical reaction not involving combustion or catalytic oxidation
- G01N25/4846—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity on solution, sorption, or a chemical reaction not involving combustion or catalytic oxidation for a motionless, e.g. solid sample
Abstract
The present invention relates to technical field of concrete, and in particular to the analysis method of a kind of low adiabatic temperature rise concrete of high intensity and its thermal insulation temperature rise.Silicon powder can be improved the performances such as concrete strength, durability, but influence of the silicon powder to Adiabatic temperature rise of concrete and unintelligible, and pertinent literature influences concrete calorific value in silicon powder upper even to sum up opposite conclusion.To inquire into its influence, this research preparation 15 groups of different water-binder ratios, the silicon powder concrete proportion specimen of different silicon powder doping quantities make the measurement of half thermal insulation temperature rise, and obtain thermal insulation temperature rise by thermal compensation method.As a result it proves that silicon powder can reduce Adiabatic temperature rise of concrete amount, and thermal insulation temperature rise can be significantly reduced when same intensity requires.Based on silicon powder concrete thermal insulation temperature rise as a result, this research obtains thermal insulation temperature rise prediction type by regression analysis, and depict silicon powder concrete thermal insulation temperature rise design drawing.
Description
Technical field
The present invention relates to technical field of concrete, and in particular to arrives a kind of low adiabatic temperature rise concrete of high intensity and its insulation
The analysis method of temperature rise value.
Background technique
It generally requires to pour the ultra-large volume concretes such as dam in hydraulic engineering, and controls mass concrete aquation temperature rise
The early-age crack being led to is one of the main bugbear of Hydraulic Engineering Design and construction.This is because fresh concrete is hardened in condensation
Cementitious material and water can occur hydration reaction and generate a large amount of heat of hydration in the process.Due to mass concrete in hydraulic engineering
Radiating rate is slow, and with the gradually accumulation of the heat of hydration, the temperature of fresh concrete will be risen rapidly.And rise simultaneously in temperature,
Cementitious material gradually condenses hardening.Then after cementitious material hydration reaction is basic, concrete is gradually cooling and generates aobvious
It writes and shrinks.The cooling meat will lead to the concrete hardened and generate tensile stress, if tensile stress will more than concrete tensile capacity
It is led to concrete cracking.Solving the problems, such as mass concrete early-age crack mainly has following four aspect method at present: (1) from aquation
The source of the excessively high accumulation of heat is set out, and is reduced the adiabatic temperature rise amount of fresh concrete, such as reduce cement and water consumption, is mixed fine coal
The mineral admixtures replacing section cement such as ash, blast-furnace cinder, silicon powder；(2) ready-mixed concrete molding temperature is reduced as far as possible, such as
Replace water come concrete batching with the aggregate handled through cooling even frost, with ice cube；(3) it is presclerotic to extend concrete coagulation
Radiate the time and increase heat dissipation capacity, such as pre-buried heat dissipation pipe and by circulate water take away heat, add gypsum in cement
In, add retarder；(4) reducing caused by concrete shrinkage influences, such as setting post-cast strip, temperature expansion gap etc..So
And method (2) effect is relatively limited, if single using ineffective；Method (3) and (4) can delay project progress, except foundation is set
It counts outside included measure, unit in charge of construction is not proposed with.Therefore, optimal policy is that method (1) reduction is newly mixed from the root
The adiabatic temperature rise of concrete.
For the adiabatic temperature rise for reducing fresh concrete, most popular method is Adding Mineral Admixtures replacing section cement,
Middle silicon powder is the common admixture for preparing high performance concrete.Silicon powder is the byproduct of industrial production silicon and ferrosilicon, SiO2Content
Up to 95% or more, granular size, can be with hydrolysis product of cement Ca (OH) between 0.1-0.2 microns2Pozzolanic reaction occurs
Further generating C-S-H gel keeps concrete microstructure finer and close.Although silicon powder is widely used in strong concrete and height
Intensity self-compacting concrete, however, different researchers have even obtained opposite in the research that silicon powder influences concrete temperature rise
Conclusion.Influence of the silicon powder to concrete calorific value is not verified also, and silicon powder concrete temperature rise design specification is also lacked.
Summary of the invention
In view of the above technical problems, the first aspect of the present invention provides a kind of low adiabatic temperature rise concrete of high intensity,
Preparing raw material includes cement, water, silicon powder；The weight of the silicon powder accounts for 0~15wt% of the cement and silicon powder mixture weight.
As a kind of perferred technical scheme, the weight of the silicon powder account for the cement and silicon powder mixture weight 5~
10wt%.
As a kind of perferred technical scheme, the dosage of water described in the concrete meet water-cement ratio be 1:(0.20~
0.50)。
As a kind of perferred technical scheme, the water-cement ratio is 1:(0.20~0.32).
As a kind of perferred technical scheme, the dosage of water described in concrete meet water-cement ratio be 1:(0.20~
0.25)。
As a kind of perferred technical scheme, preparing raw material further includes aggregate；The aggregate accounts for the volume in concrete
Than being 40~70%.
As a kind of perferred technical scheme, the aggregate includes coarse aggregate and fine aggregate；The coarse aggregate and fine aggregate
Weight ratio be (3:2)~(2:3).
The second aspect of the invention provides the thermal insulation temperature rise of high-intensitive low adiabatic temperature rise concrete as described above
Analysis method measures concrete respectively and prepares water weight W, cement weight C, silicon powder weight S in raw material, then calculates cement weight
The cementitious material weight B of amount and the sum of silicon powder weight, is finally calculated thermal insulation temperature rise Δ T according to the following formula:
Wherein, parameter meets 3.950≤φ of the following conditions2≤4.250；9.850≤φ3≤10.050；0.0355≤φ4
≤0.0375；0.0195≤φ5≤0.0210；0.0800≤φ6≤0.0900；φ1、φ7、φ8It is not higher than 10-6。
As a kind of perferred technical scheme, the φ1、φ7、φ8It is zero.
As a kind of perferred technical scheme, the thermal insulation temperature rise Δ T is calculated according to the following formula:
The utility model has the advantages that Adiabatic temperature rise of concrete value can be effectively reduced by adding silicon powder, wherein mixing 5wt% silicon powder reduces insulation temperature
It appreciates 1.8~7.3 DEG C, mixing 10wt% silicon powder reduces by 3.3~10.2 DEG C of thermal insulation temperature rise, and adiabatic temperature rise reduces degree by water-cement ratio
It influences；Simultaneously non-intensity more high temperature rise is higher for concrete, and intensity can be improved simultaneously and reduce adiabatic temperature rise by adding silicon powder, can be identical
Adiabatic temperature rise of concrete value is significantly reduced under intensity requirement；The prediction of silicon powder concrete thermal insulation temperature rise is given based on experimental result
Model.
Detailed description of the invention
Fig. 1 is that adiabatic temperature rise of the silicon powder concrete under same intensity requirement shows figure, wherein what 1 (curve of prismatic) referred to
It is silicon powder content 0wt%；2 (curves of open circles) refer to silicon powder content 5wt%；3 (curves of rectangle) refer to that silicon powder contains
Measure 10wt%.
Fig. 2 is to mix 10wt% silicon powder concrete thermal insulation temperature rise design drawing, and x therein is water-cement ratio.
Specific embodiment
It is further clear, complete that the technical characteristic work in technical solution is provided to the present invention With reference to embodiment
Description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on this
Embodiment in invention, every other reality obtained by those of ordinary skill in the art without making creative efforts
Example is applied, shall fall within the protection scope of the present invention.
Word " preferred ", " preferably ", " preferred " in the present invention etc. refer to, can provide certain in some cases
The embodiment of the present invention of a little beneficial effects.However, other embodiments may also under identical circumstances or in the case of other
It is preferred.In addition, not implying that other embodiments are unavailable to the statement of one or more preferred embodiments, it is not yet
It is intended to exclude other embodiments except the scope of the present invention.
Analysis method provided in the present invention can be operated according to the sequence of default, can not also in sequence into
Row operation.
In view of the above technical problems, the first aspect of the present invention provides a kind of low adiabatic temperature rise concrete of high intensity,
Preparing raw material includes cement, water, silicon powder；The weight of the silicon powder accounts for 0~15wt% of the cement and silicon powder mixture weight.
The powdery hydraulicity inorganic coagulation material that cement in the present invention is well known to those skilled in the art, adds water and stirs
Afterwards at slurry, it can harden or harden in water in air, and can the materials such as sand, stone are cemented together securely.This hair
In bright particular determination is not carried out to the cement, various portland cements etc. can be selected, such as meets EU criteria BS EN
The 52.5N rank portland cement that 197:Part 1:2000 is required.
Particular determination is not carried out to the water in the present invention, conventional tap water, deionized water, purified water etc. are available
In concrete in the present invention.
Silicon powder (Microsilica or Silica Fume) in the present invention, is also SILICA FUME, and scientific name " silicon ash " is industry
Electric furnace collect processing through special capturing device during high melt industrial silicon and ferrosilicon, with the flue dust of exhaust gas evolution and
At.
In some embodiments, the weight of the silicon powder accounts for 5~10wt% of the cement and silicon powder mixture weight.
Preferably, the silicon powder uses the silicon powder of 40~200 mesh partial sizes.
In some embodiments, it is 1:(0.20~0.50 that the dosage of water described in the concrete, which meets water-cement ratio).
Preferably, the water-cement ratio is 1:(0.20~0.32).
It is further preferred that the dosage of the water meets water-cement ratio when the dosage of silicon powder in concrete is 5~10wt%
For 1:(0.20~0.25).
The water-cement ratio in the present invention refers to the weight and cementitious material weight ratio of water, wherein the cementitious material
Weight is the sum of silicon powder weight and cement weight.It should be appreciated that in addition to being pointed out in any operational instances, or otherwise
In the case where, it is in love in institute to indicate that all numbers of the amount of ingredient used in such as description and claims should be understood
It is modified under condition by term " about ".
Different researchers have obtained different conclusion in the influence of silicon powder in the prior art.Though to find out its cause, applicant thinks
Right cement composition, silicon powder quality, molding temperature, care environments etc. can be led to result difference, but different researchers in silicon powder to mixed
Different conclusion in solidifying soil calorific value influence problem is main reason is that experiment matches the difference of used water consumption.Due to water
The pozzolanic reaction of the hydration reaction and silicon powder of mud is required to the participation of water, water or water-cement ratio and chemically reacts in silicon powder concrete
It is played a crucial role in fever.
In some embodiments, preparing raw material further includes aggregate；It is 40 that the aggregate, which accounts for the volume ratio in concrete,
~70%.It is preferred that the aggregate includes coarse aggregate and fine aggregate；The weight ratio of the coarse aggregate and fine aggregate be (3:2)~
(2:3).
Aggregate in the present invention also known as " gathers materials ".The bulk material of skeleton and filling effect is played in concrete and mortar.Have
Fine aggregate and two kinds of coarse aggregate.Fine aggregate particle diameter between 0.16~5mm, generally use natural sand, as river sand, sea sand and
Mountain valley sand etc., when lacking natural sand, it is also possible to the artificial sand that solid rock is ground；Coarse aggregate particle diameter is greater than 5mm, commonly uses
Have rubble and cobble, under similarity condition, the intensity of crushed stone concrete is higher than boulder concrete, but rubble is rolled by rock
Broken to form, cost is height compared with cobble.Common coarse aggregate has a natural porous rock such as float stone in lightweight aggregate concrete, haydite, swollen
The artificial porous aggregate such as swollen slag.The particle diameter of heretofore described fine aggregate is between 0.16~5mm, the particle of coarse aggregate
Between 5~20mm of diameter, particular determination is not carried out to the material of aggregate, it can be using granite stones etc..
Particles of aggregates diameter can be screened according to method well-known to those skilled in the art in the present invention, such as
The standard screen of special pore size distribution (such as 5mm) is placed on shake table, and places a charging tray in the lower section of the standard screen, it then will be real
It tests concrete uniform mixing and spreads in the standard screen, after starting shake table, the test concrete in sieve is turned using tool,
The aggregate of specified particle diameter is obtained until falling in charging tray on the standard screen without mortar.
In order to preferably promote application of the silicon powder concrete in mass concrete, in engineer application, it is necessary to silicon
The thermal insulation temperature rise of powder concrete has reliable prediction.For this purpose, the second aspect of the invention provide it is high-intensitive low as described above
The analysis method of the thermal insulation temperature rise of adiabatic temperature rise concrete measures concrete respectively and prepares water weight W, cement weight in raw material
C, silicon powder weight S are measured, then calculates the cementitious material weight B of the sum of cement weight and silicon powder weight, finally according to the following formula
Thermal insulation temperature rise Δ T is calculated:
Wherein, parameter meets 3.950≤φ of the following conditions2≤4.250；9.850≤φ3≤10.050；0.0355≤φ4
≤0.0375；0.0195≤φ5≤0.0210；0.0800≤φ6≤0.0900；φ1、φ7、φ8It is not higher than 10-6。
φ thereini(i=1 to 8) is to influence coefficient.Regression analysis shows to influence coefficient φ1,φ7And φ8It is very small.
For Simplified prediction model formula, φ1、φ7And φ8It is set as 0.In some preferred embodiments, the thermal insulation temperature rise Δ T
It is calculated according to the following formula:
In order to study and prove influence of the scheme in the present invention to performances such as Adiabatic temperature rise of concrete values, the present invention is prepared
15 groups of different water-binder ratios, the silicon powder concrete proportion specimen of different silicon powder doping quantities make the measurement of half thermal insulation temperature rise, and pass through heat
Penalty method obtains thermal insulation temperature rise.
Wherein, ideal adiabatic temperature rise measurement request realizes that concrete and external environment zero calory transmit, and needs environment temperature
It is absolutely identical as surface temperature of concrete to spend the moment, and test condition harshness is generally difficult to realize.For realize adiabatic temperature rise measurement,
The half adiabatic temperature rise experiment of this researching and designing measures and makees the measurement method of thermal compensation calculating.
Half adiabatic temperature rise experimental provision: before carrying out the measurement of half adiabatic temperature rise of concrete sample, manufactured size 0.4m
The wooden experimental box that the upper cover of × 0.4m × 0.4m (length × width × height) can be opened and is closed, and in cabinet corner location, sideline
Midpoint, face center, the pre-buried thermocouple vane in cabinet central location.After concrete sample is stirred, experimental box is opened
Upper cover fills that cover upper cover after jolt ramming properly close vibrating in the concreting inlet body after stirring and simultaneously with the stick that shakes
Envelope.Behind (concrete heat release temperature rise is substantially completely completed after 6 day time) in 6 day time, it is sensed using pre-buried thermocouple
Piece uninterruptedly measures the temperature data of each position each period.During test, laboratory ambient temperature is maintained at 22-24 DEG C.
Dissipated heat compensation method: when carrying out the experiment measurement of half adiabatic temperature rise, due to concrete sample surface temperature ratio
Environment temperature is high, and the calorific value of aquation temperature rise can be partially lost in environment, the part dispersed heat available heat compensation side
Method is calculated by formula (1)-(4).
It is directly proportional to ambient temperature differences by heat loss rate and concrete surface when concrete heating rate significantly slows
Relationship can release
Wherein, TVFor certain moment concrete ensemble average temperature；T is the time；λ is heat transfer coefficient；TSIt is flat for concrete surface
Equal temperature；TAFor environment temperature.
After obtaining λ by formula (1), adiabatic temperature rise TGIt can be obtained by following formula
TGFor Adiabatic temperature rise of concrete temperature；TPFor concrete molding temperature.
Wherein, TV、TSIt can be calculated according to weight distribution by formula (3) and (4):
TVFor certain moment concrete ensemble average temperature；TmFor cabinet central point temperature；TfFor face central temperature；TeFor side
Line central temperature；TcFor corner temperature；TSFor concrete surface mean temperature.
In the embodiment that above-mentioned 15 groups of differences are matched, the cement used is 52.5N rank portland cement, meets EU criteria
BS EN 197:Part 1:2000.Coarse-fine aggregate is granite stones, and maximum particle diameter is respectively 20mm and 5mm.All samples
Mixing water-reducing agent makes mobility satisfaction actually pour needs, and water-reducing agent used is Polycarboxylic Superplasticizer.
The aggregate volume ratio of all concrete proportionings is unified for 56%, and coarse-fine aggregate ratio is unified for 3:2.To eliminate into mould
The molding temperature of influence of the temperature to hydrated cementitious and silicon powder pozzolanic reaction, material is controlled at 26 ± 2 DEG C.Each group of proportion is equal
It makes a 400mm cube concrete sample and makees adiabatic temperature rise measurement and three 150mm cuboid samples 28 days pressure resistances of work
Degree measurement.
1 thermal insulation temperature rise of table and strength character test table
As can be seen from the above table, can be reduced by adding 5wt% silicon powder by 1.8 DEG C to 7.3 DEG C of thermal insulation temperature rise, add 10wt%
Silicon powder can reduce by 3.3 DEG C to 10.2 DEG C of thermal insulation temperature rise.In the range of 0.24 to 0.40 water-cement ratio, when silicon powder doping quantity is
When 10wt%, thermal insulation temperature rise is reduced as water-cement ratio increases；When silicon powder doping quantity is 0wt%% and 5wt%, adiabatic temperature rise
Value first increases as water-cement ratio increases, and maximum value is reached when water-cement ratio is about 0.34, then reduce as water-cement ratio increases.
This is because hydrated reaction of cement and silicon powder pozzolanic reaction, which are required to water, participates in reaction, with the increase of water-cement ratio, on the one hand
Water increases and another aspect cement and silicon powder weight reduce, and there are optimal water-cement ratios to make hydrated reaction of cement and silicon powder volcanic ash
Reacting dose reaches maximum value.The result shows that when no admixture silicon powder, every 100kg/m in concrete proportioning3Cementitious material can generate
9.7 to 12.9 DEG C of thermal insulation temperature rises；After mixing 5wt% silicon powder, every 100kg/m in concrete proportioning3The insulation temperature of cementitious material
It rises generation value and falls to 9.5 to 11.9 DEG C；After mixing 10wt% silicon powder, every 100kg/m in concrete proportioning3Cementitious material it is exhausted
Hot temperature rise value further falls to 9.4 to 11.0 DEG C.This is because the silicon powder pozzolanic reaction calorific value of homogenous quantities is lower than cement
Hydration reaction calorific value.
Silicon powder is in addition to it can reduce concrete temperature rise value in phase homogenous quantities cementitious material, moreover it is possible to significantly improve intensity.
The result shows that unit glue can be significantly reduced under same intensity requirement by adding silicon powder when value of concrete strength is lower than 100MPa
Gel material thermal insulation temperature rise；When value of concrete strength is higher than 100MPa, silicon powder is added to unit cementitious material thermal insulation temperature rise
Influence it is less.As a result it also clearly demonstrates, simultaneously non-intensity is higher for concrete, and thermal insulation temperature rise is centainly bigger.This with it is traditional
The big habit thinking of strong concrete temperature rise is not consistent.In fact, if the approach for reaching concrete high-strength degree is by mixing
The method for adding the method for silicon powder displacement cement rather than improving cement amount, Adiabatic temperature rise of concrete value is not but not raising instead can
It is reduced.Therefore, silicon powder, which can allow, concrete while reaching high-intensitive and low thermal insulation temperature rise, can more preferably promote the high property of large volume
It can the application of concrete and universal.
In addition, having carried out thermal insulation temperature rise analysis also according to following formula to the concrete in above-described embodiment 1~15:The results are shown in Table 2 for it.
2 thermal insulation temperature rise of table analyzes result table
As can be seen that the analysis method of the thermal insulation temperature rise of the low adiabatic temperature rise concrete of high intensity provided by the invention can be with
Estimating for thermal insulation temperature rise is carried out to the concrete in the present invention well, adiabatic temperature rise predicted value worst error only has 1.4 DEG C,
Coefficient R2Up to 0.968, it is able to satisfy requirement of engineering completely.For convenience of engineer application, insulation can also be drawn according to prediction model
Temperature rise value design drawing, this diagram depicts the adiabatic temperature rise thermoisopleths under different silicon powder doping quantities and water-cement ratio, as shown in Figure 2.
The above is only presently preferred embodiments of the present invention, is not the limitation for making other forms to invention, any
Those skilled in the art are changed or are changed to the equivalent of equivalent variations possibly also with the technology contents of the disclosure above
Embodiment, but without departing from the technical solutions of the present invention, it is to the above embodiments according to the technical essence of the invention
Any simple modification, equivalent variations and remodeling, still fall within the protection scope of technical solution of the present invention.
Claims (10)
1. a kind of low adiabatic temperature rise concrete of high intensity, which is characterized in that it includes cement, water, silicon powder that it, which prepares raw material,；The silicon
The weight of powder accounts for 0~15wt% of the cement and silicon powder mixture weight.
2. the low adiabatic temperature rise concrete of high intensity according to claim 1, which is characterized in that the weight of the silicon powder accounts for institute
State 5~10wt% of cement and silicon powder mixture weight.
3. the low adiabatic temperature rise concrete of high intensity according to claim 1, which is characterized in that water described in the concrete
Dosage meet water-cement ratio be 1:(0.20~0.50).
4. the low adiabatic temperature rise concrete of high intensity according to claim 3, which is characterized in that the water-cement ratio is 1:
(0.20~0.32).
5. the low adiabatic temperature rise concrete of high intensity according to claim 2, which is characterized in that the use of water described in concrete
It is 1:(0.20~0.25 that amount, which meets water-cement ratio).
6. the low adiabatic temperature rise concrete of high intensity according to claim 1, which is characterized in that it further includes bone that it, which prepares raw material,
Material；It is 40~70% that the aggregate, which accounts for the volume ratio in concrete,.
7. the low adiabatic temperature rise concrete of high intensity according to claim 5, which is characterized in that the aggregate includes coarse aggregate
And fine aggregate；The weight ratio of the coarse aggregate and fine aggregate is (3:2)~(2:3).
8. the analysis of the thermal insulation temperature rise of the low adiabatic temperature rise concrete of high intensity described in any one according to claim 1~7
Method, which is characterized in that measure concrete respectively and prepare water weight W, cement weight C, silicon powder weight S in raw material, then calculate
The cementitious material weight B of the sum of cement weight and silicon powder weight out, is finally calculated thermal insulation temperature rise Δ according to the following formula
T:
Wherein, parameter meets 3.950≤φ of the following conditions2≤4.250；9.850≤φ3≤10.050；0.0355≤φ4≤
0.0375；0.0195≤φ5≤0.0210；0.0800≤φ6≤0.0900；φ1、φ7、φ8It is not higher than 10-6。
9. analysis method according to claim 8, which is characterized in that the φ1、φ7、φ8It is zero.
10. analysis method according to claim 9, which is characterized in that the thermal insulation temperature rise Δ T is counted according to the following formula
It obtains:
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Inventor after: Chen Jiajian Inventor after: Wu Peilin Inventor after: Guan Xianzhang Inventor before: Chen Jiajian |
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Application publication date: 20190830 |