CN105092423B - A kind of ion penetration resistance of concrete advanced prediction method based on water-cement ratio monitoring - Google Patents
A kind of ion penetration resistance of concrete advanced prediction method based on water-cement ratio monitoring Download PDFInfo
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- CN105092423B CN105092423B CN201410204199.XA CN201410204199A CN105092423B CN 105092423 B CN105092423 B CN 105092423B CN 201410204199 A CN201410204199 A CN 201410204199A CN 105092423 B CN105092423 B CN 105092423B
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Abstract
The present invention provides a kind of ion penetration resistance of concrete advanced prediction method of water-cement ratio monitoring, including following steps：(1) the concrete test test specimen of different water-binder ratios is prepared, it is tested and surveys water-cement ratio；(2) chloride diffusion coefficient of 28 days and 56 days of the concrete test test specimen of different water-binder ratios is tested respectively；(3) the characteristic relation curve between fitting actual measurement water-cement ratio and chloride diffusion coefficient；(4) water-cement ratio of test site fresh concrete, relies on characteristic relation curve, calculates the scene fresh concrete 28 days and chloride diffusion coefficient during 56 day age is to obtain chloride diffusion coefficient predicted value；(5) judge whether the ion penetration resistance of concrete reaches specification or design requirement.The resistance of chloride ion penetration of maturing can be predicted before concreting at the scene of the invention, the concrete for being unsatisfactory for specification or design requirement can be adjusted in time, can avoid passing Potential economic losses caused by the hysteresis quality of control method.
Description
Technical field
The present invention relates to a kind of ion penetration resistance of concrete advanced prediction method based on water-cement ratio monitoring, belong to mixed
Solidifying soil durability quality control technology field.
Technical background
Concrete structure under erosion environment, the durability key parameter of concrete --- concrete chloride ion are spread
Coefficient must is fulfilled for the requirement of specification or design controlling index, and otherwise concrete structure is difficult to reach design service life.In reality
In the work progress of border, concrete construction quality control should be implemented in durability Design index, so as to ensure engineering construction product
Matter and service life.The factor such as Chloride Diffusion Coefficient in Concrete and material property, material composition and maintenance processes is related, wherein
Water-cement ratio in material composition is one of main factor for influencing concrete chloride ion diffusion.Under normal conditions, match somebody with somebody at other
During composition and division in a proportion parameter constant, the chloride diffusion coefficient of concrete is improved with the rising of water-cement ratio.
In construction process, due to being influenced be subject to factors such as Changes in weather, measurement deviations, the aggregate in concrete
It is larger Deng moisture content fluctuation, cause the water-cement ratio of job mix concrete to fluctuate, and cause agent on crack resistance of concrete chloride permeability
Property etc. durability parameter produce difference, the durability quality of concrete structure is difficult to guarantee and meets design requirement.In existing construction
In specification, such as《Marine traffic engineering Standard for quality control of concrete》(JTS 202-2-2011) and《Railway concrete engineering construction skill
Art guide》(TZ 201-2005), maturing durability quality control are tried by testing indwelling in concrete construction
28 days of part or 56 days chloride diffusion coefficients carry out.Existing concrete durability quality control process and engineering construction are same
Shi Jinhang, once the durability index test result of indwelling test specimen is not up to specification or design requirement, corresponding remedial measure has
Limit, may cause larger economic loss.Therefore, existing concrete durability method of quality control has certain hysteresis
Property, it is impossible to fully meet construction quality during concrete engineering demand for control.
The content of the invention
The purpose of the present invention is making up the deficiencies in the prior art, propose a kind of based on the mixed of fresh concrete water-cement ratio monitoring
Solidifying soil resistance of chloride ion penetration advanced prediction method.
In order to realize foregoing invention purpose, present invention employs following technical scheme：
(1) on-site concrete component design mixture proportion is directed to, cementitious material, rubble in material and mixing ratio is kept, subtracts
Aqua dosage is constant, and keeps the quality of mixing water and sand and constant, changes the mass ratio of water and sand to prepare different water
Glue than concrete test test specimen, and test the actual glue ratio of concrete test test specimen to obtain actual measurement water-cement ratio；
(2) chloride diffusion coefficient of 28 days and 56 days of the concrete test test specimen of different water-binder ratios is tested respectively；
(3) according to the actual measurement glue of step (1) chloride diffusion coefficient that when step (2) measures, it is mixed that this is fitted respectively
Solidifying soil component is based on different actual measurement glues in the case of cementitious material, rubble, water-reducing agent dosage in fixed material and mixing ratio
Than lower 28 days and characteristic relation curve during 56 day age between chloride diffusion coefficient with concrete；
(4) in the concrete component work progress, the water-cement ratio of test site fresh concrete, is relied in step (3)
Characteristic relation curve, calculate the scene fresh concrete 28 days and chloride diffusion coefficient during 56 day age with obtain chlorine from
Sub- diffusion coefficient predicted value；
(5) by the chloride diffusion coefficient predicted value compared with controlling value specified in specification or design requirement,
Judge whether the ion penetration resistance of concrete reaches specification or design requirement.
Water-cement ratio easily occurs to fluctuate and influence concrete structure durability during the present invention is directed to concrete practice of construction
The problem of, using correlation good between Chloride Diffusion Coefficient in Concrete and water-cement ratio, establish fresh concrete test water
Glue is than the characteristic relation curve between maturing chloride diffusion coefficient；In the construction process, to going out machine concrete water
Glue ratio is tested, and calculates maturing chloride diffusion coefficient using features described above relation curve, in coagulation soil scene
The predicted value of chloride diffusion coefficient is obtained before pouring, in the case where considering test and prediction deviation, judges the concrete
Whether resistance of chloride ion penetration reaches specification or design requirement, and provides foundation for on-site concrete durability quality control.With
Existing on-site concrete resistance of chloride ion penetration test method is compared, the method have the characteristics that：(1) this method is mixed at the scene
Solidifying soil predicts the resistance of chloride ion penetration of maturing according to the water-cement ratio test result for going out machine concrete before pouring, to anti-chlorine
Ion permeability index, which is unsatisfactory for specification or the concrete of design requirement, to be adjusted in time, be on-site concrete durability
Measure controls in advance and foundation is provided, Potential economic losses caused by the hysteresis quality of traditional durable property amount control method can be avoided；
(2) this method goes out the characteristic relation curve calculating maturing chlorine of machine water-binder ratio test result and fitting according to scene
Ionic diffusion coefficient, it is not necessary to which formation of concrete " quick chloride ion transport Y-factor method Y " experiment test specimen carries out chloride diffusion coefficient
Test, durability quality control are time saving, laborsaving；(3) this method is into there is inherence between, structure and performance based on coagulation local soil type
The principle of relation, is proved through multinomial research, and for identical concrete raw material, water-binder ratio has with chloride diffusion coefficient
There is good correlation, the present invention has good theoretical foundation.
Brief description of the drawings
Fig. 1 is the concrete test water-cement ratio and maturing chlorion that the present invention is measured based on a certain case history
The Attributed Relational Graps of diffusion coefficient.
Embodiment
Ion penetration resistance of concrete advanced prediction method of the present invention based on water-cement ratio monitoring, including it is following
Several steps：
(1) on-site concrete component design mixture proportion is directed to, cementitious material, rubble in material and mixing ratio is kept, subtracts
Aqua dosage is constant, and keeps the quality of mixing water and sand and constant, changes the mass ratio of water and sand to prepare different water
Glue than concrete test test specimen, and test the actual glue ratio of concrete test test specimen to obtain actual measurement water-cement ratio；
(2) series concrete of prepared different water-binder ratios is tested into test specimen, according to national standard《Normal concrete is grown
Phase performance and durability test method standard》Regulation in (GB/T 50082-2009) in " quick chloride ion transport Y-factor method Y ",
Test concrete 28 days and 56 days chloride diffusion coefficients；
(3) according to concrete sample in the step (2) of the actual measurement water-cement ratio of step (1) and its correspondence 28 days and 56 day age
The chloride diffusion coefficient measured during the phase, is fitted feelings of the concrete component based on concrete raw material used and match ratio respectively
Under condition, two characteristic relation curves when surveying water-cement ratio and concrete 28 days and 56 day age between chloride diffusion coefficient；
(4) in the construction process, machine concrete is gone out for scene, test site fresh concrete water-cement ratio, relies on step
(3) the features described above relation curve in, calculates the fresh concrete 28 days and chloride diffusion coefficient during 56 day age respectively
To obtain chloride diffusion coefficient predicted value；
(5) Chloride Diffusion Coefficient in Concrete predicted value and controlling value specified in specification or design requirement are compared
Compared with judging whether the ion penetration resistance of concrete reaches specification or design requirement, and be on-site concrete durability quality
Control provides foundation.
The test basic principle of the present invention is water-binder ratio and chloride diffusion coefficient correlation theory.When concrete
When other specification is fixed in material and mixing ratio, under identical curing condition, water-cement ratio determines that concrete chloride ion is spread
Coefficient.
Concrete sample uses traditional standard curing method in the present invention.
The test of fresh concrete water-cement ratio is stirred using japanese circle well fresh concrete water content testing instrument in concrete
After the completion of carry out.
According to prediction result, judgement is prepared in situ whether ion penetration resistance of concrete meets that specification or design will at this time
Ask, and foundation is provided for on-site concrete durability quality control.
Embodiment one
Sample：Existing prefabricated immersed tube concrete mix (the gel material content 420kg/m of port Zhuhai and Macao bridge3, cement,
Flyash, ground granulated blast furnace slag account for respectively cementitious material 45%, 25%, 30%) be basic match ratio, it coordinates such as table
Shown in 1.Under conditions of keeping the fixation of other Stock allotment rights, change coagulation local prescription water consumption, fluctuate water-cement ratio up and down, respectively
Prepare the series concrete that design water-cement ratio is 0.33,0.34,0.35,0.36,0.37,0.38.
Table 1 tests concrete benchmark match ratio (unit：kg/m3)
Using fresh concrete water content testing instrument, the water-binder ratio of series is tested to more than, is respectively set
The corresponding actual measurement glue of water-cement ratio concrete when measurement error is counted, as shown in table 2.
Table 2 tests concrete test water-cement ratio
| Design water-cement ratio | 0.330 | 0.340 | 0.350 | 0.360 | 0.370 | 0.380 |
| Test water-cement ratio | 0.337 | 0.345 | 0.351 | 0.361 | 0.371 | 0.382 |
| Measurement error (%) | 2.1 | 1.5 | 0.3 | 0.3 | 0.3 | 0.5 |
The series concrete is tested into test specimen, standard curing tests Chloride Diffusion Coefficient in Concrete after 28 days and 56 days,
The results are shown in Table 3.
Table 3 tests Chloride Diffusion Coefficient in Concrete
The characteristic relation curve of series concrete actual measurement water-cement ratio and 28 days and 56 days chloride diffusion coefficients is fitted, such as
Shown in Fig. 1.Wherein, testing relation curve between water-cement ratio and concrete 28 days, 56 day age chloride diffusion coefficient can be according to
Secondary to be expressed as formula 1 and formula 2, correlation is followed successively by 0.964,0.945.
Y=309.1x2- 198.9x+36.23 (formula 1)
Y=495.2x2- 331.2x+58.25 (formula 2)
To serial number in work progress 1~6 it is a series of go out machine concrete water-cement ratio test, surveyed according to water-cement ratio
Test result and features described above relation curve, obtain this batch of series and go out machine concrete 28 days and the prediction of 56 days chloride diffusion coefficients
Value, the results are shown in Table 4.
The construction water-binder ratio test of table 4 and chloride diffusion coefficient predicted value result
For the accuracy of comparison prediction value, one group of contrast test is prepared.The series of above-mentioned serial number 1~6 is gone out into machine
Contrast test test specimen 1~6 is made in correspondence to concrete respectively, conserves at the standard conditions, using " quick chloride ion transport coefficient
Method " method carries out the batch concrete 28 days and chloride diffusion coefficient test in 56 days, obtains the measured value of chloride diffusion coefficient,
It the results are shown in Table 5.
The construction Chloride Diffusion Coefficient in Concrete measured value of table 5
Compared with the predicted value corresponding with table 4 of the measured value in table 5, prediction deviation is calculated, the results are shown in Table 6.
6 Chloride Diffusion Coefficient in Concrete prediction deviation of table
Result can be seen that from table, and the predicted value and measured value uniformity of Chloride Diffusion Coefficient in Concrete are good, 28 days
Prediction deviation with 56 days chloride diffusion coefficients has high accuracy within 10%.
, can be to the agent on crack resistance of concrete chloride permeability that is prepared in situ according to Chloride Diffusion Coefficient in Concrete predicted value in table 4
Property whether reaches specification or design requirement judges, and foundation is provided for on-site concrete durability quality control.Consider prediction
Deviation, provides more accurate chloride diffusion coefficient prediction and durable during the subsequent construction of the engineering immersed tube concrete
Property amount controls.
Claims (3)
- A kind of 1. ion penetration resistance of concrete advanced prediction method based on water-cement ratio monitoring, it is characterised in that including following Several steps：(1) on-site concrete component design mixture proportion is directed to, keeps cementitious material, rubble, water-reducing agent in material and mixing ratio Dosage is constant, and keeps the quality of mixing water and sand and constant, changes the mass ratio of water and sand to prepare different water-binder ratios Concrete test test specimen, and test the actual glue ratio of concrete test test specimen to obtain actual measurement water-cement ratio；(2) chloride diffusion coefficient of 28 days and 56 days of the concrete test test specimen of different water-binder ratios is tested respectively；(3) according to the actual measurement glue of step (1) chloride diffusion coefficient that when step (2) measures, concrete structure is fitted respectively Part based on cementitious material, rubble, water-reducing agent dosage in fixed material and mixing ratio it is constant in the case of different actual measurement water-cement ratios With the characteristic relation curve between chloride diffusion coefficient when concrete 28 days and 56 day age；(4) in the concrete component work progress, the water-cement ratio of test site fresh concrete, relies on the spy in step (3) Relation curve is levied, the scene fresh concrete is calculated 28 days and chloride diffusion coefficient during 56 day age is expanded with obtaining chlorion Dissipate coefficient predictors；(5) by the chloride diffusion coefficient predicted value compared with controlling value specified in specification or design requirement, judge Whether the ion penetration resistance of concrete reaches specification or design requirement.
- 2. according to the method described in claim 1, it is characterized in that：Step (2) is according to national standard《Normal concrete chronicity Can be with durability test method standard》In regulation in quick chloride ion transport Y-factor method Y test concrete 28 days and 56 days chlorine Ionic diffusion coefficient.
- 3. according to the method described in claim 1, it is characterized in that：28 days and 56 days of concrete test test specimen in step (2) Curing condition is identical with 28 days of live fresh concrete in step 4 and 56 days curing conditions.
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| CN105844007B (en) * | 2016-03-21 | 2019-05-10 | 深圳大学 | Based on intensity and chloride ion permeability Two indices concrete mixing proportion design method |
| CN105973757A (en) * | 2016-04-28 | 2016-09-28 | 东南大学 | Method for obtaining chlorine ion diffusion and combination parameters in cement-based material |
| CN108680469A (en) * | 2018-04-28 | 2018-10-19 | 皖西学院 | A kind of ion penetration resistance of concrete measurement method |
| WO2020258250A1 (en) * | 2019-06-28 | 2020-12-30 | 深圳信息职业技术学院 | Test sample preparation method and test sample preparation system |
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Effective date of registration: 20181227 Address after: No. 157, Guangzhou City, Guangdong, Guangdong Co-patentee after: CCCC Fourth Harbor Engineering Co., Ltd. Patentee after: Zhongjiao Sihang Engineering Inst. Co., Ltd. Co-patentee after: Guangzhou Harbor Engineering Quality Examination Co., Ltd. Address before: No. 157, Guangzhou City, Guangdong, Guangdong Co-patentee before: CCCC Fourth Harbor Geotechnical Engineering Co., Ltd. Patentee before: Zhongjiao Sihang Engineering Inst. Co., Ltd. Co-patentee before: Guangzhou Harbor Engineering Quality Examination Co., Ltd. Co-patentee before: Guangzhou Sihang Material Technology Co., Ltd. |