CN103196770A - Quick concrete water-binder ratio measurement method - Google Patents
Quick concrete water-binder ratio measurement method Download PDFInfo
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- CN103196770A CN103196770A CN2013101231189A CN201310123118A CN103196770A CN 103196770 A CN103196770 A CN 103196770A CN 2013101231189 A CN2013101231189 A CN 2013101231189A CN 201310123118 A CN201310123118 A CN 201310123118A CN 103196770 A CN103196770 A CN 103196770A
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Abstract
The invention discloses a quick concrete water-binder ratio measurement method which comprises the following steps of: testing the mass M1 of new stirred concrete mortar which is screened in air and the mass M2 of the new stirred concrete mortar in water, cleaning the mortar in a sieve with 0.16mm meshes, weighing the mass S2 of sand in the water, pre-testing the cement density Rhoc and the surface density Rhos of the sand, constructing the following three equations: W+C+S=M1, C/Rhoc*(Rhoc-1)+S/Rhos*(Rhos-1)=M2, and S2/(Rhos-1)*Rhos=S, directly calculating the mass of the sand in the mortar through the equations to calculate other variables and the water-binder ratio, and performing error correction, so as to obtain the relatively precision concrete water-binder ratio W,/C,. According to the formulas S,=500*S2/S1, C,=(M2-S2)*Rhoc/(Rhoc-1)-(500*S2/S1-S2*Rhos)/(Rhos-1), and W,=M1-C,-S,. By using the method, the site concrete water-binder ratio can be quickly and directly tested with high precision; the test error is extremely small, and the precision is extremely high; and the benefits for the quality control and the detection of concrete are realized.
Description
Technical field
The invention belongs to the concrete works technical field, be specifically related to a kind of rapid assay methods of water-binder ratio.
Background technology
The quality of concrete works is concrete component production and builds the problem that construction is very paid close attention to, at present, be the concrete quality of main acceptance index with concrete strength, the standards and norms of the nearly all country in the whole world all are just can know in 28 days after concreting.Because this test method cycle is long, can't in time control and judge concrete quality.For many years, concrete quality is tested in early days, and development is very fast in developed country, also obtains a lot of experts, scholar's great attention at home.How the early stage quality of concrete of test fast is the problem that domestic and international concrete industry is very paid close attention to, and also is an important ring of modern concrete construction quality guarantee system.
Summary of the invention
The rapid assay methods that the purpose of this invention is to provide a kind of water-binder ratio, water-cement ratio by quick test fresh concrete is judged quality of concrete, its short activity duration, can the early detection hidden danger of quality, and effectively control and have a certain precision.
Test fast for realization fresh concrete quality, reach the purpose of timely monitoring concrete quality.Now according to China's test specification prevailing for the time being in force " concrete for hydraulic structure testing regulations " (DL/T5150-2001) and " Standard for test methods of properties of ordinary concrete mixture standard " (GB/T50080-2002), the water-cement ratio of on-site concrete is carried out a large amount of check tests.For general plastic concrete, adopt grab sample, sieve direct sample with 5mm, from fresh concrete, directly sift out mortar, consider the influence of air content, the mortar of normal concrete adopts vibration row bubble, and concrete mortar adopts the row's of stirring bubble fast, and adopted new modification method, realized the directly test fast of high precision of fresh concrete water-cement ratio.
In the quick test process of fresh concrete water-cement ratio, once adopted by the water-cement ratio analysis to design mixture proportion and set up regression equation, and be successfully applied in the engineering practice.But because material in the engineering and condition change often, need rebulid regression equation according to concrete engineering, it is long to draft the equation test period again, uses inconvenience, influences measuring accuracy sometimes.Through the substantive test analysis, inherent law between sampling, row's foam method formula and material mixture ratio and the test result and effective modification method of high precision measurement water-cement ratio have been found out in the research of especially different modification methods.
The rapid assay methods of water-binder ratio of the present invention is undertaken by following
:
1) according to the principle of water contained in the mortar no quality in water, the aerial mass M of fresh concrete mortar after the test sieve is got
1With the mass M in water
2, in the 0.16mm sieve, clean mortar, take by weighing the quality S of sand in water
2, the cement density ρ of test simultaneously and in advance
c, sand apparent density ρ
sCan set up following 3 equations:
W+C+S=M
1 （1）
C/ρ
c×（ρ
c-1）+S/ρ
s×（ρ
s-1）=M
2 （2）
S
2/（ρ
s-1）×ρ
s=S （3）
In the formula: the quality of water in W-mortar; The quality of cement in C-mortar; The quality of sand in S-mortar; S
2The quality of sand in water in the-mortar; ρ
cThe density of--cement; ρ
sThe apparent density of-sand; M
1The aerial quality of-mortar; M
2The quality of-mortar in water;
Equation (1) for the aerial quality of mortar be cement, sand, the aerial quality of water and; Equation (2) is quality and sand in water the quality sum of cement in water for the quality of mortar in water; The quality of sand in the mortar be can directly obtain by equation (3), thereby other variable and water-cement ratio calculated rapidly;
During 2) in order to last system of equations test evaluation water-cement ratio, error is very big, relation between the quality in the water after must setting up original sand and in 0.16mm sieve, sieving and washing quality in the water of back and clean in the 0.16mm sieve with sand in the test mortar, consider the influence of sand silt content simultaneously, it is as follows to draw revised equation through the correction test of water-binder ratio:
S
，=500*S
2/S
1 （4）
S in the formula
1The quality of-500g sand 0.16mm sieve flushing back in water;
C
，=（M
2-S
2）*ρ
c/（ρ
c-1）-（500*S
2/S
1-S
2*ρ
s/（ρ
s-1）） （5）
W
，=M
1-C
，-S
， （6）
Obtaining more accurate water-binder ratio is W
,/ C
,S
,Be the quality of sand in the revised mortar, W
,Be the quality of water in the revised mortar, C
,The quality of cement in the revised mortar.
Water-cement ratio by quick test fresh concrete is judged quality of concrete, its activity duration is short, can the early detection hidden danger of quality, and have certain precision, compare with the concrete intensity of fast survey, water-cement ratio is controllable factor, and intensity is stochastic variable, be test result, therefore, survey water-cement ratio soon and have more vitality at control of concrete quality.Not only test error is very little, precision is very high, and very useful with detection to quality of concrete control.
Embodiment
According to the method for direct test water-cement ratio, (DL/T5150-2001) detect in conjunction with " concrete for hydraulic structure testing regulations ".From concrete mix, sift out sand-cement slurry with the 5mm sieve, weigh up the aerial quality of mortar and the quality in water respectively, in the 0.16mm sieve, clean mortar, and weigh up its quality in water, use above system of equations directly to calculate water-cement ratio.
Concrete steps are as follows:
1) the aerial mass M of fresh concrete mortar after the test sieve is got
1With the mass M in water
2, in the 0.16mm sieve, clean mortar, take by weighing the quality S of sand in water
2, the cement density ρ of test simultaneously and in advance
c, sand apparent density ρ
sSet up following 3 equations:
W+C+S=M
1 （1）
C/ρ
c×（ρ
c-1）+S/ρ
s×（ρ
s-1）=M
2 （2）
S
2/（ρ
s-1）×ρ
s=S （3）
In the formula: the quality of water in W-mortar; The quality of cement in C-mortar; The quality of sand in S-mortar; S
2The quality of sand in water in the-mortar; ρ
cThe density of--cement; ρ
sThe apparent density of-sand; M
1The aerial quality of-mortar; M
2The quality of-mortar in water;
Equation (1) for the aerial quality of mortar be cement, sand, the aerial quality of water and; Equation (2) is quality and sand in water the quality sum of cement in water for the quality of mortar in water; The quality of sand in the mortar be can directly obtain by equation (3), thereby other variable and water-cement ratio calculated rapidly;
2) round-off error:
S
，=500*S
2/S
1 （4）
S in the formula
1The quality of-500g sand 0.16mm sieve flushing back in water;
C
，=（M
2-S
2）*ρ
c/（ρ
c-1）-（500*S
2/S
1-S
2*ρ
s/（ρ
s-1）） （5）
W
，=M
1-C
，-S
， （6）
Obtaining more accurate water-binder ratio is W
,/ C
,
S
,Be the quality of sand in the revised mortar, W
,Be the quality of water in the revised mortar, C
,The quality of cement in the revised mortar.
Claims (1)
1. the rapid assay methods of a water-binder ratio is characterized in that carrying out according to the following steps
:
1) the aerial mass M of fresh concrete mortar after the test sieve is got
1With the mass M in water
2, in the 0.16mm sieve, clean mortar, take by weighing the quality S of sand in water
2, Ce Shi cement density ρ in advance
c, sand apparent density ρ
s, set up following 3 equations:
W+C+S=M
1 （1）
C/ρ
c×（ρ
c-1）+S/ρ
s×（ρ
s-1）=M
2 （2）
S
2/（ρ
s-1）×ρ
s=S （3）
In the formula: the quality of water in W-mortar; The quality of cement in C-mortar; The quality of sand in S-mortar; S
2The quality of sand in water in the-mortar; ρ
cThe density of--cement; ρ
sThe apparent density of-sand; M
1The aerial quality of-mortar; M
2The quality of-mortar in water;
The quality of sand in the mortar be can directly obtain by equation (3), thereby other variable and water-cement ratio calculated;
2) round-off error:
S
，=500*S
2/S
1 （4）
S in the formula
1The quality of-500g sand 0.16mm sieve flushing back in water;
C
，=（M
2-S
2）*ρ
c/（ρ
c-1）-（500*S
2/S
1-S
2*ρ
s/（ρ
s-1）） （5）
W
，=M
1-C
，-S
， （6）
Obtaining more accurate water-binder ratio is W
,/ C
,
S
,The quality of sand in the-revised mortar, W
,The quality of water in the-revised mortar, C
,The quality of cement in the-revised mortar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101231189A CN103196770A (en) | 2013-04-10 | 2013-04-10 | Quick concrete water-binder ratio measurement method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101231189A CN103196770A (en) | 2013-04-10 | 2013-04-10 | Quick concrete water-binder ratio measurement method |
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| Publication Number | Publication Date |
|---|---|
| CN103196770A true CN103196770A (en) | 2013-07-10 |
Family
ID=48719462
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013101231189A Pending CN103196770A (en) | 2013-04-10 | 2013-04-10 | Quick concrete water-binder ratio measurement method |
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| Country | Link |
|---|---|
| CN (1) | CN103196770A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104568642A (en) * | 2014-12-26 | 2015-04-29 | 柳州黔桥工程材料有限公司 | Method for automatically judging water-to-binder ratio of mudjacking slurry |
| CN106116317A (en) * | 2016-06-30 | 2016-11-16 | 中国水利水电第五工程局有限公司 | A kind of high-ductility concrete and the method controlling its mix performance |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3000412A1 (en) * | 1979-03-06 | 1981-07-09 | Hubert K. Prof. Dr.-Ing. 7504 Weingarten Hilsdorf | Non-cured concrete composition determining system method - uses specimen weighing in flotation vessel which is repeated after slurry removal using clean water |
| JPS5977339A (en) * | 1982-10-25 | 1984-05-02 | Nippon Saiseki Kogyo Kk | Method for measuring surface water of aggregate |
| CN101629889A (en) * | 2009-08-18 | 2010-01-20 | 中国建筑第八工程局有限公司 | Method for measuring pressure water absorption rate of lightweight aggregate concrete |
-
2013
- 2013-04-10 CN CN2013101231189A patent/CN103196770A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3000412A1 (en) * | 1979-03-06 | 1981-07-09 | Hubert K. Prof. Dr.-Ing. 7504 Weingarten Hilsdorf | Non-cured concrete composition determining system method - uses specimen weighing in flotation vessel which is repeated after slurry removal using clean water |
| JPS5977339A (en) * | 1982-10-25 | 1984-05-02 | Nippon Saiseki Kogyo Kk | Method for measuring surface water of aggregate |
| CN101629889A (en) * | 2009-08-18 | 2010-01-20 | 中国建筑第八工程局有限公司 | Method for measuring pressure water absorption rate of lightweight aggregate concrete |
Non-Patent Citations (1)
| Title |
|---|
| 鹿永久等: "西霞院混凝土水胶比的快速测定", 《云南水力发电》, vol. 24, no. 3, 27 August 2008 (2008-08-27), pages 72 - 75 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104568642A (en) * | 2014-12-26 | 2015-04-29 | 柳州黔桥工程材料有限公司 | Method for automatically judging water-to-binder ratio of mudjacking slurry |
| CN106116317A (en) * | 2016-06-30 | 2016-11-16 | 中国水利水电第五工程局有限公司 | A kind of high-ductility concrete and the method controlling its mix performance |
| CN106116317B (en) * | 2016-06-30 | 2018-04-17 | 中国水利水电第五工程局有限公司 | A kind of high-ductility concrete and the method for controlling its mix performance |
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Application publication date: 20130710 |