CN105260509A - Method for determining temperature process curve of ultrahigh fly-ash content hydraulic massive concrete - Google Patents
Method for determining temperature process curve of ultrahigh fly-ash content hydraulic massive concrete Download PDFInfo
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Abstract
The invention discloses a method for determining a temperature process curve of ultrahigh fly-ash content hydraulic massive concrete. The method comprises: using normal concrete and ultrahigh mixture concrete to perform an adiabatic temperature rise test, manufacturing an ultrahigh mixture concrete cubic large test block with side length of 1.2 m to carry out a temperature measuring test, combined with an internal point actual measured temperature record of a certain double-curvature arch dam which is established by using the normal concrete, providing an ultrahigh mixture concrete adiabatic temperature rise model, to improve temperature simulation calculation program, so as to simulate a temperature process curve of an ultrahigh mixture concrete dam which has no construction precedent. The method can be used for temperature-stress test evaluation and early-age crack resistance.
Description
Technical field
The invention belongs to the Green High Performance hydraulic large-volume concrete necessary new method of temperature-stress test that early length of time, splitting resistance was evaluated.
Background technology
Large dosage mineral admixture concrete can be saved cement in a large number, turn waste into wealth, and alleviates environmental pollution, reduces hydration heat temperature rise and improve its performance.Current flyash is still the main admixture of hydraulic large-volume concrete.With regard to normality dam concrete dam (non-RCCD) built both at home and abroad, the most high additive of flyash is within 70%.The volume of U.S.'s dam outside is 25%, and inside is then 50%; The most high additive of Japan is 30%; China's Three Gorges Dam is 20%-50%; China " concrete for hydraulic structure mixes flyash technical manual " (DL/T5055-2007) specifies that its volume must not more than 55%.Eight, the nineties, promotes the development of high performance concrete for improving permanance, and then promotes the application of flyash, be elder generation especially with high volume fly ash concrete (HVFC).Canadian Malhotra equals the performance starting comprehensive system research HVFC for 1985.Choose this country 11 kinds, the U.S.'s 8 kinds of flyash respectively.Its volume is about 200kg/m
3, cement is about 150kg/m
3(namely doping quantity of fly ash accounts for 55 ~ 60% of binder total amount), through mixing high efficiency water reducing agent, water-cement ratio is down to 0.30 ~ 0.32, the HVFC prepared, workability is about 200mm, meets pumping construction requirement.It has excellent mechanics and resistance of chloride ion penetration, freeze thawing resistance circulation ability, resistance to abrasion etc., for the important engineering such as basis of the beam of the caisson pile of Wharf Engineering, covil construction, plate, post, satellite launch platform.Investigation and application HVFC is significant.But the people such as Malhotra do not study temperature to the impact of its performance.From the research of domestic and international existing HVFC, still there is following deficiency: in (1) engineering, I, II grade of ash are applied more, but a large amount of rudimentary ashes is not used.(2) because water-cement ratio occupies high, doping quantity of fly ash be can not improve.(3) experimental technique that for want of " HVFC " is correct and evaluation criterion, cannot the effect of accurate estimated temperature, also limits doping quantity of fly ash.Current China dam concrete still uses limit stretch value and adiabatic temperature rise or " the permission temperature difference " to evaluate its splitting resistance.Prevent thermal crack at early stage, be by test its parameter such as adiabatic temperature rise, hydration heat of cement determination starting material and match ratio, and take precooling to mix and stir, bury the controlling measurement internal-external temperature differences such as cold water pipe underground, reduce maximum temperature rise as far as possible." the permission temperature difference " is from on-site experience.And " the permission temperature difference " of the suggestion of the ACI207 council should be relevant with the age of concrete, tensile strength, elastic modulus, thermal expansivity, members constrain degree etc.The new method of testing of the early stage thermal stress of everybody positive Exploration and application modern times prediction, substituting is the aging method of foundation at present with on-site experience, to solve the technical barrier of early-age cracking.Temperature-stress test is the effective ways that research concrete bracing and its splitting resistance of test are new.
Concrete temperature-stress test has thermal insulation, constant temperature and Temperature Matching maintenance (TMC) three kinds of temperature models.With the concrete riper of adiabatic model for benchmark, the time that control constant temperature and Temperature Matching mode condition lower on-test lower the temperature and rate of temperature fall.Result of study shows: under adiabatic curing pattern, concrete stress development is very fast, and Cracking Temperature is higher, and two kinds of concrete splitting resistance difference are more remarkable; Under another two kinds of patterns, two kinds of crack-resistant performance of concrete are suitable; Adiabatic model has been over-evaluated initial cooling point, has been underestimated concrete anti-crack ability, constant temperature mode can not embody the compressive pre-stress that temperature rise produces impact, concrete cracking temperature is on the low side, only have Temperature Matching pattern can objective embodiment temperature history on the impact of practical structures thing stress and Cracking Temperature.
But superelevation fly ash hydraulic large-volume concrete (being called for short " superelevation adding Concrete ") not yet applies in actual dam engineering, be just difficult to by the Temperature Matching condition of the dam concrete temperature history curve of surveying as temperature-stress test.Therefore, the temperature history curve of " superelevation adding Concrete " dam having no precedent construction precedent with finite element simulation simulation is most important, for temperature-stress test evaluate its early the length of time splitting resistance.
Summary of the invention
Purport of the present invention on the basis of existing technology, proposes to have no precedent the new method that the adiabatic temperature rise model of " superelevation adding Concrete " of construction precedent and temperature history curve are determined.The inventive method is that early the length of time, splitting resistance evaluated necessary new method to Green High Performance hydraulic large-volume concrete, can be used widely in Hydraulic structure Material and Structural Engineering.
The present invention is achieved in that
The present invention carries out the adiabatic temperature rise test of the normality dam concrete (" normal concrete ") of 35% doping quantity of fly ash and the superelevation content fly ash normality dam concrete (" superelevation adding Concrete ") of 80% doping quantity of fly ash, the length of side is the large test block thermometric test of cube of the superelevation adding Concrete of 1.2m, in conjunction with the internal point observed temperature record of certain the hyperbolic induced joint A adopting " normal concrete " built, the adiabatic temperature rise model of " superelevation adding Concrete " is proposed, temperature simulation calculation procedure is improved with this, thus the temperature history curve of " superelevation adding Concrete " dam of construction precedent is had no precedent in simulation, for temperature-stress test evaluate its early the length of time splitting resistance.
The technical solution used in the present invention is:
The method of finite element simulation simulation superelevation content fly ash hydraulic large-volume concrete temperature history curve, described method comprises the steps:
(1) select to represent purpose project and the starting material meeting national standard as test starting material, make " normal concrete " test specimen and " superelevation adding Concrete " test specimen, carry out the adiabatic temperature rise test of two kinds of concrete samples respectively; Make the large test block of " superelevation adding Concrete " cube of the 1.2m length of side, lay point for measuring temperature therein, test its temperature history curve in length of time morning from entering mould; To the entity dam built with " normal concrete ", bury the temperature history curve that its internal point tested by temperature sensor underground;
(2) concrete adiabatic temperature rise model is very important in simulation dam concrete temperature field, determines that the adiabatic temperature rise model of " superelevation adding Concrete " is the problem that first will solve; Adiabatic temperature rise based on " superelevation adding Concrete " is tested, and proposes a kind of adiabatic temperature rise model being applicable to " superelevation adding Concrete " of improvement and determines its parameter value, for dam Finite Element Simulation of Temperature; And test based on the adiabatic temperature rise of " normal concrete ", propose a kind of adiabatic temperature rise model being applicable to " normal concrete " of improvement and determine its parameter value, for dam Finite Element Simulation of Temperature;
(3) " temperature stress emulated finite element program " based on the establishment of Fortran language can the temperature field of analogue simulation concrete component and structure and stress field, improves Temperature Field Simulation calculate by the adiabatic temperature rise model being applicable to " normal concrete " of the adiabatic temperature rise model being applicable to " superelevation adding Concrete " that improves and improvement;
(4) Temperature Field Simulation program is utilized, by the adiabatic temperature rise model of " the superelevation adding Concrete " that improve, the temperature history curve of the large test block point for measuring temperature of calculating simulation superelevation adding Concrete cube, contrast with step (1) measured curve, result is coincide, and the applicability improving adiabatic temperature rise model is described; For the entity dam that " normal concrete " is built, the temperature history curves that the temperature history curve gone out by Temperature Field Simulation process simulation and actual dam engineering are surveyed is good, proves the applicability of the Temperature Field Simulation program improved; Simulate the temperature history curve of superelevation content fly ash hydraulic large-volume concrete having no precedent construction precedent thus, for temperature-stress test evaluate its early the length of time splitting resistance.
The present invention has following beneficial effect compared with prior art:
1. model is accurate.The adiabatic temperature rise computing formula of original normal concrete is no longer applicable to " superelevation adding Concrete ", and the improvement adiabatic temperature rise model that the present invention proposes and computing formula meet the actual conditions of material, can improve the precision that Temperature Field Simulation calculates.
2. application is wide.Adiabatic temperature rise model proposed by the invention and the defining method of temperature history curve are not only applicable to superelevation fly ash normal concrete dam, also be applicable to other superelevation fly ash mass concrete engineerings, only need adjustment model coefficient and improve corresponding Temperature Field Simulation program.
3. Green High Performance.This method is the determination for the adiabatic temperature rise model and temperature history curve solving superelevation adding Concrete, and then for temperature-stress test evaluate its early the length of time splitting resistance, the mineral admixture (flyash etc.) of high additive as far as possible can be applied in engineering, utilize industrial waste, reduce Portland cement consumption as much as possible, accomplish environmental protection.In addition, doping quantity of fly ash is higher, and concrete temperature rise is less, to large volume concrete structural the length of time morning splitting resistance and permanance very favourable.
Accompanying drawing explanation
Fig. 1 be the actual measurement of the present invention's two kinds of concrete with the adiabatic temperature rise curve comparison figure of matching;
Fig. 2 is Temperature Field Simulation calculation flow chart of the present invention;
Fig. 3 is the large test block finite element model of superelevation adding Concrete thermometric of the present invention;
Fig. 4 be superelevation adding Concrete cube of the present invention large test block simulation with the contrast of the temperature history curve of actual measurement;
Fig. 5 be dome dam internal point normal concrete of the present invention simulation with actual measurement temperature history curve comparison figure;
Fig. 6 is the temperature history curve of the present invention's two kinds of concrete simulations.
Embodiment
The example of the embodiment of determination superelevation fly ash hydraulic large-volume concrete adiabatic temperature rise model of the present invention and temperature history curve new method is below provided.
Example:
1. the test of " superelevation adding Concrete "
1.1 test starting material and match ratios
This test preparation two kinds of concrete, " normal concrete " adopts starting material and the match ratio of the dam concrete of dome dam A.The starting material that two kinds of different doping quantity of fly ash concrete " normal concrete " (35% doping quantity of fly ash) and " superelevation adding Concrete " (80% doping quantity of fly ash) are tested are the starting material that dome dam A uses: China is common 42.5 portland cements newly, Jingmen III level flyash, fine aggregate is artificial sand, and coarse aggregate is the artificial rubble of maximum diameter of aggrogate 40mm.Its match ratio is in table 1:
The match ratio of the dam concrete of table 1 two kinds of different doping quantity of fly ash
1.2. test
(1) make the adiabatic temperature rise test specimen of two kinds of doped fly ash concretes, according in " concrete for hydraulic structure testing regulations " (DL/T5150-2001) 4.17 method test two kinds of concrete adiabatic temperature rise curves.
(2) making the length of side is the large test block of " superelevation adding Concrete " cube of 1.2m, lays point for measuring temperature therein, tests its temperature history in length of time morning from entering mould.
2. the adiabatic temperature rise model improved
Adiabatic temperature rise of concrete model generally normal employing index, hyperbolic curve and complex indexes formula represents.Because of the concrete that doping quantity of fly ash is lower, hydrated cementitious heat release is fast, its adiabatic temperature rise curve of exponential sum hyperbolic model energy simulate.But superelevation adding Concrete, be difficult to simulate its adiabatic temperature rise curve by this two formula, and error is larger.The present invention is according to hyperbolic function expression formula and complex indexes expression formula, and the adiabatic temperature rise curve proposing the function expression simulation superelevation adding Concrete of the adiabatic temperature rise of two kinds of dam concretes is as follows:
In formula: θ (τ)---Adiabatic temperature rise of concrete, DEG C;
τ---the concrete length of time, sky;
M, n, p, q, a, b---coefficient undetermined.
Formula (1) and formula (2) can the more flexibly and accurately actual hydration heat processes of simulation concrete, thus better determine the function model more close with actual measurement adiabatic temperature rise curve.
The present invention adopts formula (1) and (2), and in conjunction with two kinds of concrete adiabatic temperature rise test figures of doping quantity of fly ash, relevant parameter in each function expression is determined in matching, the results are shown in Table 2 and 3.Contrast the concrete adiabatic temperature rise function expression of acquisition two kinds thus.
The table 2 normal concrete adiabatic temperature rise model parameter of adiabatic temperature rise test data fitting
| Formula | p | a | b | q | m | n |
| (1) | 10.75 | 15.00 | 1.809 | 0.010 | ||
| (2) | 13.00 | 31.344 | 24.733 | 12.51 | 1.246 |
The table 3 superelevation adding Concrete adiabatic temperature rise model parameter of adiabatic temperature rise test data fitting
| Formula | p | a | b | q | m | n |
| (1) | 7.77 | 7.91 | 0.857 | 0.857 | ||
| (2) | 7.622 | 0.020 | 7.108 | 7.305 | 0.580 |
By measured curve and the comparative analysis with different function expression matched curve of two kinds of concrete adiabatic temperature rises, obtain the matched curve of two kinds of concrete function expression the most close with actual measurement adiabatic temperature rise curve, as Fig. 1.
Two kinds that obtain concrete adiabatic temperature rise curve representation formulas are respectively:
Normal concrete:
Superelevation adding Concrete:
3. superelevation adding Concrete Temperature Field Simulation and determine temperature history curve
3.1 Temperature Field Simulation calculation procedure brief introductions
" temperature stress emulated finite element program " based on the establishment of Fortran language can the temperature field of analogue simulation concrete component and structure and stress field.The thermodynamic behaviour of material, the information such as layering and unit node of building are made four files, for reading and the calculating of program.The flow process that Temperature Field Simulation calculates is as Fig. 2.
3.2 adopt the adiabatic temperature rise model emulation improved to simulate the temperature history of the large test block of superelevation adding Concrete
With the temperature history that the above-mentioned Temperature Field Simulation process simulation superelevation adding Concrete length of side is the large test block point for measuring temperature of 1.2m cube.The finite element model set up is as Fig. 3.
In Fig. 3, the length of side is the test cube of 1.2m, the heat conducting ground of the calculating of bottom needed for simulated program.With the regular hexahedron of the 10cm length of side for unit carries out element subdivision.The adiabatic temperature rise model of superelevation adding Concrete adopts formula (4), is input in Temperature Field Simulation program, simulates the temperature history curve of large test block temperature point, with the temperature history curve comparison of this measuring point of actual measurement as Fig. 4.As seen from the figure, the temperature history curve of superelevation adding Concrete cube large test block simulation and actual measurement is more identical, illustrates that the adiabatic temperature rise model proposed is suitable for the Temperature Field Simulation calculating of superelevation adding Concrete.
According to calculating, the temperature of the inner point for measuring temperature of test block reached peak value at 2-3 days.Measuring point temperature affects greatly by outside air temperature, heat up and temperature-fall period not obvious.For avoiding test block thermometric by the interference of outside air temperature, test block size should be strengthened further and maybe can obtain more close to the temperature history curve of material self character.
3.3. the temperature history curve of temperature simulation simulation arch dam A monolith internal point
What the dome dam A of built height of dam 210m constructed is normal concrete, buries temperature measurer underground in advance, record its temperature history curve in this inside, dam.At the 3m layer concrete center representative apart from 22.5m place at the bottom of dam, have the temperature history curve of actual measurement, simultaneously using this position also as the calculation level in temperature field, by Temperature Field Simulation accounting temperature course curve.Fig. 5 be dome dam A internal point normal concrete actual measurement with simulation temperature history curve comparison figure.
As seen from Figure 5, dome dam normal concrete simulation calculation is consistent with the temperature history curve of actual measurement, illustrates that the adiabatic temperature rise model improved that adopts of the present invention is to the rationality of dome dam temperature simulation and accuracy.The temperature field of this temperature simulation program computation superelevation adding Concrete available.
The temperature history curve of the superelevation adding Concrete dam of 80% doping quantity of fly ash of precedent of not constructing so far, than normal concrete, have identical monolith model, arrangement and method for construction and dam body position etc., but adiabatic temperature rise model is different both during analogue simulation.By the two kinds of concrete adiabatic temperature rise models improved, improve Temperature Field Simulation calculation procedure, obtain two kinds of concrete temperature history curves, see Fig. 6.
Temperature history curve under 3.4 superelevation adding Concrete Temperature Matching patterns
The temperature history curve of superelevation adding Concrete of temperature simulation calculation procedure simulation, can be used as the guiding curve of temperature-stress test under Temperature Matching pattern (TMC), research and evaluate the splitting resistance in length of time morning of superelevation adding Concrete.
Claims (2)
1. determine the method for superelevation content fly ash hydraulic large-volume concrete temperature history curve, it is characterized in that described method comprises the steps:
(1) select to represent purpose project and the starting material meeting national standard as test starting material, make " normal concrete " test specimen and " superelevation adding Concrete " test specimen, carry out the adiabatic temperature rise test of two kinds of concrete samples respectively; Make the large test block of " superelevation adding Concrete " cube of the 1.2m length of side, lay point for measuring temperature therein, test its temperature history curve in length of time morning from entering mould; To the entity dam built with " normal concrete ", bury the temperature history curve that its internal point tested by temperature sensor underground;
(2) adiabatic temperature rise based on " superelevation adding Concrete " is tested, and proposes a kind of adiabatic temperature rise model being applicable to " superelevation adding Concrete " of improvement and determines its parameter value, for dam Finite Element Simulation of Temperature; Adiabatic temperature rise based on " normal concrete " is tested, and proposes a kind of adiabatic temperature rise model being applicable to " normal concrete " of improvement and determines its parameter value, for dam Finite Element Simulation of Temperature;
(3) " temperature stress emulated finite element program " based on the establishment of Fortran language can the temperature field of analogue simulation concrete component and structure and stress field, improves Temperature Field Simulation calculate by the adiabatic temperature rise model being applicable to " normal concrete " of the adiabatic temperature rise model being applicable to " superelevation adding Concrete " that improves and improvement;
(4) Temperature Field Simulation program is utilized, by the adiabatic temperature rise model of " the superelevation adding Concrete " that improve, the temperature history curve of the large test block point for measuring temperature of calculating simulation superelevation adding Concrete cube, contrast with step (1) measured curve, result is coincide, and the applicability improving adiabatic temperature rise model is described; For the entity dam that " normal concrete " is built, the temperature history curves that the temperature history curve gone out by Temperature Field Simulation process simulation and actual dam engineering are surveyed is good, proves the applicability of the Temperature Field Simulation program improved; Simulate the temperature history curve of the superelevation content fly ash hydraulic large-volume concrete having no precedent construction precedent thus.
2. the method for claim 1, it is characterized in that in described step (1), described " normal concrete " is the normality dam concrete of 35% doping quantity of fly ash, and described " superelevation adding Concrete " is the superelevation content fly ash normality dam concrete of 80% doping quantity of fly ash.
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| CN201610123701.3A CN105808836A (en) | 2015-09-17 | 2016-03-04 | Method for determining temperature process curve of mass concrete with ultrahigh volume of fly ash |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105808836A (en) * | 2015-09-17 | 2016-07-27 | 浙江工业大学 | Method for determining temperature process curve of mass concrete with ultrahigh volume of fly ash |
| CN105893705A (en) * | 2016-04-27 | 2016-08-24 | 常州大学 | Method for calculating temperature field of premixed large-volume concrete |
| CN109030794A (en) * | 2018-07-25 | 2018-12-18 | 武汉三源特种建材有限责任公司 | A kind of concrete temperature rise rapid detection method |
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| CN105260509A (en) * | 2015-09-17 | 2016-01-20 | 浙江工业大学 | Method for determining temperature process curve of ultrahigh fly-ash content hydraulic massive concrete |
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| CN105808836A (en) * | 2015-09-17 | 2016-07-27 | 浙江工业大学 | Method for determining temperature process curve of mass concrete with ultrahigh volume of fly ash |
| CN105893705A (en) * | 2016-04-27 | 2016-08-24 | 常州大学 | Method for calculating temperature field of premixed large-volume concrete |
| CN109030794A (en) * | 2018-07-25 | 2018-12-18 | 武汉三源特种建材有限责任公司 | A kind of concrete temperature rise rapid detection method |
| CN109030794B (en) * | 2018-07-25 | 2020-12-18 | 武汉三源特种建材有限责任公司 | Concrete temperature rise rapid detection method |
| CN111414656A (en) * | 2019-01-07 | 2020-07-14 | 中国建筑第八工程局有限公司 | Segmental casting method and analysis method for large-volume radiation-proof concrete wall |
| CN113094868A (en) * | 2021-03-04 | 2021-07-09 | 交通运输部公路科学研究所 | Method for evaluating usability of cement hydration heat inhibition concrete in large-volume structural engineering |
| CN113094868B (en) * | 2021-03-04 | 2023-05-23 | 交通运输部公路科学研究所 | Method for evaluating availability of cement hydration heat inhibition concrete in large-volume structural engineering |
| CN113551995A (en) * | 2021-06-29 | 2021-10-26 | 无锡市欧凯电子有限公司 | Hydraulic measurement and control method |
| CN113551995B (en) * | 2021-06-29 | 2022-04-12 | 无锡市欧凯电子有限公司 | Hydraulic measurement and control method |
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Application publication date: 20160120 |