CN105893705A - Method for calculating temperature field of premixed large-volume concrete - Google Patents
Method for calculating temperature field of premixed large-volume concrete Download PDFInfo
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- CN105893705A CN105893705A CN201610269526.9A CN201610269526A CN105893705A CN 105893705 A CN105893705 A CN 105893705A CN 201610269526 A CN201610269526 A CN 201610269526A CN 105893705 A CN105893705 A CN 105893705A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
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- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
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Abstract
The invention discloses a method for calculating a temperature field of premixed large-volume concrete. The method is characterized in that the temperatures of the surface point and the central point in the temperature field of the premixed large-volume concrete under the curing conditions of different insulating materials can be predicted by applying the relational expression. The predicting expression of the method is shown in the specification, wherein T is the predicted temperature, t is the age (t is more than 0), a peak point is (Xc, Tc), w is the wave width at the position shown in the specification, and A is more than 0 and is a constant under the fixed condition of the invention. The method disclosed by the invention has the advantages that the fitted-out relational expression is closer to reality compared with the previous research result under the specific condition, a more-accurate calculation method is provided for effectively controlling the highest temperature inside concrete and the temperature difference inside and outside the concrete, and the significance in preventing temperature cracks from occurring is great.
Description
Technical field
The present invention relates to Temperature Field in Bulky Concrete computational methods, belong to structural analysis computing technique field.
Background technology
In recent years, along with quickening and the development of urban construction of the every infrastructure construction of China, construction scope constantly expands
Greatly, large-scale state-of-the-art technology facility or structures are on the increase, and xoncrete structure is good and cheap with its material, easy construction,
Bearing capacity is big, can decorate strong feature, is increasingly subject to the welcome of people, and then mass concrete is increasingly becoming and constitutes large-scale setting
Execute or the important component part of structures main body.
Along with increasingly increasing of mass concrete engineering, the measure of its technical elements requires also to seem the most important.Greatly
The engineering practice of amount shows, mass concrete, the most easily occurred because splitting if do not taked rational technical measures in the construction stage
The engineering accident that seam is caused.Concrete occupies critical role in modern construction.And in today, the crack of concrete is relatively
For generally, in all kinds of engineerings, crack is the most omnipresent.Although we adopt various measures in construction, careful, but
Crack still occurs now and then.Tracing it to its cause, we note it being one of them not to the change of concrete temperature stress.Substantially
In long-pending concrete, temperature stress and temperature control significant.This is mainly due to both sides reason.First, executing
In work, usually there is thermal cracking in concrete, has influence on globality and the durability of structure.Secondly, in operation process, temperature
Change the stress state on structure and there is the impact that significantly can not be ignored.Temperature in the mainly construction that we run into is split
Seam.
For the indirect action crack that the harm such as mass concrete are bigger, due to influence factor and the complexity of the regularity of distribution
Property, their research work but to be carried out less, control method is concrete.Product for crack preventing
Life and development, it is necessary to understanding fully the Cracking Mechanism of concrete, simulation concrete condition of construction and external environmental condition are to concrete
Temperature Distribution carries out simulation analysis.Due to the development of computer technology and updating of computational methods, mass concrete is tied
The emulated computation method in structure temperature field is the most constantly improved, and occurs in that more computational methods.But, at different thermal insulating materials
Under the conditions of material, Temperature Field in Bulky Concrete computational methods but rarely have and relate to.Determine that relevant parameter splits controlling mass concrete
Stitch particularly important.
Summary of the invention
The invention solves the problems that the deficiency of the temperature controlled computational methods of Temperature Field in Bulky Concrete, it is provided that a kind of calculating
The method in large volume ready-mixed concrete temperature field.
The prediction expression of matching of the present invention is:Wherein T is predicted temperature, and t is
Age (t > 0), peak point (XC,TC), w isThe ripple width at place, A > 0, for the constant under rigid condition of the present invention.It is suitable for
Premixing Temperature Field in Bulky Concrete surface point and the temperature of central point under the different insulation material curing condition of prediction, the most not
Include with insulation material: straw screen or mat, heat preservation rock quilt, health preserving blanket, puggaree, Polypropylence Sheet, fiber crops, cystosepiment.
As limitation of the invention, premixing mass concrete of the present invention is the commodity coagulation of C40～C60
Soil, its main material is: cement uses P.0 42.5～P.0 52.5 class g cement；S95 level slag；Flyash uses II grade of fine coal
Ash；Coarse aggregate uses the rubble of 5～40mm continuous gradings；Fine aggregate uses natural river sand；Additive uses water reducer.
Advantages of the present invention:
Existing correlational study lays particular emphasis on theoretical research more, and the present invention is according to testing the relationship expression that surveyed data simulate
Formula, convenient prediction mass concrete internal and external temperature.
Detailed description of the invention
The present invention will be described further with regard to following example, however, it should be noted that these embodiments only illustrate
It is used, and is not necessarily to be construed as the restriction that the present invention implements.
Embodiment 1
Select C40 concrete, smallest cross-sectional a size of 1m × 1m, straw screen or mat covering curing, use surface point temperature computation public
Formula:
Embodiment 2
Select C40 concrete, smallest cross-sectional a size of 1m × 1m, straw screen or mat covering curing, use central point temperature computation public
Formula:
Embodiment 3
Selecting C40 concrete, smallest cross-sectional a size of 1m × 1m, heat preservation rock is capped maintenance, uses surface point temperature
Computing formula:
Embodiment 4
Select C40 concrete, smallest cross-sectional a size of 1m × 1m, health preserving blanket covering curing, use surface point temperature computation
Formula:
Embodiment 5
Select C40 concrete, smallest cross-sectional a size of 1m × 1m, health preserving blanket covering curing, use central point temperature computation
Formula:
Embodiment 6
Select C40 concrete, smallest cross-sectional a size of 1m × 1m, puggaree covering curing, use surface point temperature computation
Formula:
Embodiment 7
Select C40 concrete, smallest cross-sectional a size of 1m × 1m, puggaree covering curing, use central point temperature computation
Formula:
Claims (9)
1. the method calculating large volume ready-mixed concrete temperature field, it is characterised in that apply the described relational expression can be near
Seemingly determine premixing Temperature Field in Bulky Concrete surface point and the temperature of central point under different insulation material curing condition.The method
Prediction expression be:Wherein T is predicted temperature, and t is age (t > 0), peak point
(XC,TC), w isThe ripple width at place, A > 0, for the constant under rigid condition of the present invention.
A kind of method calculating large volume ready-mixed concrete temperature field the most according to claim 1, it is characterised in that described
Different insulation materials include straw screen or mat, heat preservation rock quilt, health preserving blanket, puggaree, Polypropylence Sheet, fiber crops, cystosepiment.
A kind of method calculating large volume ready-mixed concrete temperature field the most according to claim 1, it is characterised in that described
Under the conditions of straw screen or mat covering curing, computational chart cake hygrometric formula is:
Calculating central point hygrometric formula is:
A kind of method calculating large volume ready-mixed concrete temperature field the most according to claim 1, it is characterised in that described
Heat preservation rock is capped under curing condition, and computational chart cake hygrometric formula is:
Calculating central point hygrometric formula is:
A kind of method calculating large volume ready-mixed concrete temperature field the most according to claim 1, it is characterised in that described is supporting
Under the conditions of raw blanket covering curing, computational chart cake hygrometric formula is:
Calculating central point hygrometric formula is:
A kind of method calculating large volume ready-mixed concrete temperature field the most according to claim 1, it is characterised in that described
Under the conditions of puggaree covering curing, computational chart cake hygrometric formula is:
Calculating central point hygrometric formula is:
A kind of method calculating large volume ready-mixed concrete temperature field the most according to claim 1, it is characterised in that described
Under the conditions of Polypropylence Sheet covering curing, computational chart cake hygrometric formula is:
Calculating central point hygrometric formula is:
A kind of method calculating large volume ready-mixed concrete temperature field the most according to claim 1, it is characterised in that described
Under the conditions of fiber crops covering curing, computational chart cake hygrometric formula is:
Calculating central point hygrometric formula is:
A kind of method calculating large volume ready-mixed concrete temperature field the most according to claim 1, it is characterised in that described
Under the conditions of cystosepiment covering curing, computational chart cake hygrometric formula is:
Calculating central point hygrometric formula is:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610269526.9A CN105893705A (en) | 2016-04-27 | 2016-04-27 | Method for calculating temperature field of premixed large-volume concrete |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610269526.9A CN105893705A (en) | 2016-04-27 | 2016-04-27 | Method for calculating temperature field of premixed large-volume concrete |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110256016A (en) * | 2019-07-19 | 2019-09-20 | 中国三峡建设管理有限公司 | A kind of calculation method applied to water conservancy project concrete hydrating temperature rise value under adiabatic condition |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102979307A (en) * | 2012-12-12 | 2013-03-20 | 新疆生产建设兵团金来建设工程技术研发有限责任公司 | Temperature-controlled crack prevention construction method for concrete structure |
| 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 |
-
2016
- 2016-04-27 CN CN201610269526.9A patent/CN105893705A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102979307A (en) * | 2012-12-12 | 2013-03-20 | 新疆生产建设兵团金来建设工程技术研发有限责任公司 | Temperature-controlled crack prevention construction method for concrete structure |
| 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 |
Non-Patent Citations (1)
| Title |
|---|
| 聂凤玲: "大体积混凝土温度场分析", 《甘肃科技》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110256016A (en) * | 2019-07-19 | 2019-09-20 | 中国三峡建设管理有限公司 | A kind of calculation method applied to water conservancy project concrete hydrating temperature rise value under adiabatic condition |
| CN110256016B (en) * | 2019-07-19 | 2021-05-25 | 中国三峡建设管理有限公司 | Method for calculating hydration temperature rise value of hydraulic concrete applied under adiabatic condition |
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Application publication date: 20160824 |