CN103728205A - Method for determining gas content in hardened concrete - Google Patents
Method for determining gas content in hardened concrete Download PDFInfo
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- CN103728205A CN103728205A CN201310743450.5A CN201310743450A CN103728205A CN 103728205 A CN103728205 A CN 103728205A CN 201310743450 A CN201310743450 A CN 201310743450A CN 103728205 A CN103728205 A CN 103728205A
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Abstract
The invention relates to a method for determining gas content in hardened concrete, belonging to the technical field of building material testing. Some research has been done in the field of determination of gas content in fresh concrete in China at present, but the determination method of gas content in hardened concrete is still a blank. A volumetric method and a pressure method have been provided for determining gas content of fresh concrete in China, and related equipment has been invented and produced for effective determination; and however, the volumetric method and pressure method are not available for determining gas content in hardened concrete any more. The invention aims to provide a new testing method capable of testing gas content in hardened concrete; and the method has important meanings for predicting freezing resistance of hardened concrete in cold areas.
Description
One, technical field
The invention belongs to building materials technical field of measurement and test.Specifically be a kind of method of measuring maturing air content, the method principle science, tests simple and conveniently, can measure more accurately the method for maturing air content.
Two, background technology
The feature such as that concrete material has is cheap, easy construction, bearing capacity are strong is widely used in engineering construction, is the building materials of consumption maximum.In recent decades, because concrete durability is bad, cause the accident of structure premature failure of common occurrence at home and abroad.At cold district, it is the principal mode of destroying concrete structure that freeze thawing circulation destroys.Not only in " three Norths " area, there is xoncrete structure freeze-thaw damage phenomenon in China's xoncrete structure, gentleer at weather, but still there is the regional freeze-thaw damage phenomenon that still has xoncrete structure in plateau (Nei Mongol Plateau, Qinghai-Tibet Platean etc.) that freezing East China, Central China (as Shandong, Anhui, Jiangsu, Hubei and other places) and height above sea level are higher winter.According to the investigation of water power department, find, almost all there is freeze-thaw damage phenomenon in the hydraulic engineering concrete in China " three Norths " area, concrete be subject to freeze-thaw damage and produce degrade, crack, a lot of large-scale concrete engineerings generally can only move about 30 years, have even less than 20 years.In Qinghai-xizang Plateau Region, concrete road surface damage is serious, generally occurs crack, groove, even there will be loose and washboard, and the damage of part highway accounts for more than 90%, has a strong impact on highway transportation and safety.
As everyone knows, concrete freeze-thaw damage and concrete air content are closely bound up, and the current domestic mensuration for concrete 's air-containing is only confined to the content measurement of fresh concrete, air content for maturing is not also made research, project of the present invention is intended intending to address this problem, and adopts MIC-840-01 type maturing pore texture analyzer to measure the air content of maturing.
Three, summary of the invention
The object of the invention is to propose a kind of method of testing maturing air content, can easily and accurately measure maturing air content, the present invention has 2 important innovative points, and first: proposed a set of method of testing sample of preparing.Second: the domestic MIC-840-01 type maturing pore texture analyzer that adopts is first measured maturing air content, and result of calculation is more accurate.
(1) by adopting automatic type rock cutter to cut into the test specimen of 10cm × 10cm × 1cm through the standard concrete curing box maintenance 10cm × 10cm of 28 days × 40cm maturing sample, on same sample, prepare three test test specimens.
(2) adopt bench grinder to grind test specimen surface, use successively model 100#, 180# emery grinds, and polishes test specimen surface.
(3) polishing is proceeded on test specimen surface muller being disposed on glass plate, should keep surfacing, and use the emery of model for 240# and 320# in grinding, makes test specimen surfacing smooth, does not occur cut.
(4) clean grinded test specimen surface.
(5) will clean complete test specimen in air air-dry 12 hours, or be placed in baking oven and dry, oven temperature is between 80～100 ℃.
(6) brushing fluorescer on dry test specimen facet, and in air air-dry 4～6 hours.
(7) test specimen after air-dry is ground on glass plate, in the process of grinding, check test specimen surface, require the fluorescer of concrete surface to grind away, and the fluorescer in pore is retained completely, can not grind new pore simultaneously.With portable purple light, detect lamp and check test specimen surface, until the fluorescer on test specimen surface is star spot shape, distribute, stop grinding.
(8) again clean grinded test specimen surface, and with portable purple light, detect lamp and check test specimen surface, the fluorescer that surface ground in new pore or pore as observed is polished, should again prepare test specimen.
(9) after test specimen meets the requirements, in air after natural air drying for testing the bubble characteristic parameter of maturing.
Sample detects
Adopt MIC-840-01 type maturing pore texture analyzer to measure maturing air content, this instrument can be tested inside concrete microtexture, can automatically measure the bubble characteristic parameter (such as bubble number, bubble pore diameter distribution, mean air bubble diameter, specific surface area, interval coefficient etc.) of maturing inside, can also bleed bubble and non-bleed bubble separately be analyzed by artificial setting, thereby provide the quantitative description of concrete hole gap structure.This equipment can be accelerated concrete bubole analysis speed simultaneously, reduces human error and experimental error in the test of concrete bubble, improves measuring accuracy and speed, and the diameter that can measure bubble aperture is 9.917 μ m～2185.740 μ m.
Four, embodiment
Adopt China Resources, Guangxi cement, the medium sand providing with Beijing Fu Wei commerce trading center (river sand) is that coarse aggregate is prepared concrete as fine aggregate and mountain masonry, after its sclerosis, measures its maturing air content.
Sample preparation
(1) by adopting automatic type rock cutter to cut into the test specimen of 10cm × 10cm × 1cm through the standard concrete curing box maintenance 10cm × 10cm of 28 days × 40cm maturing sample, on same sample, prepare three test test specimens.
(2) adopt bench grinder to grind test specimen surface, use successively model 100#, 180# emery grinds, and polishes test specimen surface.
(3) polishing is proceeded on test specimen surface muller being disposed on glass plate, should keep the smooth of surface, and use successively the emery of model for 240# and 320# in grinding, makes test specimen surfacing smooth, does not allow to occur cut.
(4) clean grinded test specimen surface, first use hairbrush to scrub, then use supersonic wave cleaning machine, the polishing placed face down of test specimen during cleaning, cleans about 5min, will clean complete test specimen in air air-dry 12 hours.
(5) with small brushes brushing fluorescer on dry test specimen facet, require brushing evenly, brushing consistency of thickness, liquid fully penetrate in concrete hole, after fluorescer brushing in air air-dry 4～6 hours, makes liquid fully curing.Should note ventilating, avoid causing experimenter's discomfort.
(6) on glass plate, adopt hand lapping, firmly want evenly, in the process of grinding, check test specimen surface, require the fluorescer of concrete surface to grind away, and the fluorescer in pore is retained, can not grind new pore simultaneously.At portable purple light, detect under light irradiation and check test specimen surface, until the fluorescer on test specimen surface is star spot shape, distribute, stop grinding.
(7) use supersonic wave cleaning machine to clean test specimen, require test specimen to scribble a placed face down of fluorescer, clean 3min left and right.
(8) again at portable purple light, detect under light irradiation and check test specimen surface, the fluorescer that surface ground in new pore or pore as observed is polished, should again prepare test specimen.
(9) after test specimen meets the requirements, in air after natural air drying for testing the bubble characteristic parameter of maturing.
The processing of test figure
Test result using the mean value of three test specimen detected values as test specimen.When one of the maximal value in three test specimens or minimum value, with the difference of intermediate value exceed intermediate value 10% time, get intermediate value.When maximal value and minimum value in three test specimens, with the difference of intermediate value all exceed intermediate value 10% time, the test of this group should be reformed, and as requested test specimen is prepared again, and then test.
Claims (1)
1. maturing measurement of air content, is characterized in that:
(1) by adopting automatic type rock cutter to cut into the test specimen of 10cm × 10cm × 1cm through the standard concrete curing box maintenance 10cm × 10cm of 28 days × 40cm maturing sample, on same sample, prepare three test test specimens;
(2) adopt bench grinder to grind test specimen surface, use successively model 100#, 180# emery grinds, and polishes test specimen surface;
(3) polishing is proceeded on test specimen surface muller being disposed on glass plate, should keep surfacing, and use the emery of model for 240# and 320# in grinding, makes test specimen surfacing smooth, does not occur cut;
(4) clean grinded test specimen surface;
(5) will clean complete test specimen in air air-dry 12 hours, or be placed in baking oven and dry, oven temperature is between 80～100 ℃;
(6) brushing fluorescer on dry test specimen facet, and in air air-dry 4～6 hours;
(7) test specimen after air-dry is ground on glass plate, in the process of grinding, check test specimen surface, require the fluorescer of concrete surface to grind away, and the fluorescer in pore is retained completely, can not grind new pore simultaneously; With portable purple light, detect lamp and check test specimen surface, until the fluorescer on test specimen surface is star spot shape, distribute, stop grinding;
(8) again clean grinded test specimen surface, and with portable purple light, detect lamp and check test specimen surface, the fluorescer that surface ground in new pore or pore as observed is polished, should again prepare test specimen;
(9) in air after natural air drying for testing the bubble characteristic parameter of maturing;
(10) adopt maturing pore texture analyzer to measure the air content of test specimen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310743450.5A CN103728205A (en) | 2013-12-30 | 2013-12-30 | Method for determining gas content in hardened concrete |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310743450.5A CN103728205A (en) | 2013-12-30 | 2013-12-30 | Method for determining gas content in hardened concrete |
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| CN103728205A true CN103728205A (en) | 2014-04-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310743450.5A Pending CN103728205A (en) | 2013-12-30 | 2013-12-30 | Method for determining gas content in hardened concrete |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4715212A (en) * | 1986-04-24 | 1987-12-29 | Jenike & Johanson, Inc. | Bulk solids property tester |
| CN101539499A (en) * | 2009-04-23 | 2009-09-23 | 浙江工业大学 | Deductive method of hardened concrete mixing ratio |
-
2013
- 2013-12-30 CN CN201310743450.5A patent/CN103728205A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4715212A (en) * | 1986-04-24 | 1987-12-29 | Jenike & Johanson, Inc. | Bulk solids property tester |
| CN101539499A (en) * | 2009-04-23 | 2009-09-23 | 浙江工业大学 | Deductive method of hardened concrete mixing ratio |
Non-Patent Citations (2)
| Title |
|---|
| 李悦: "《自密实混凝土技术与工程应用》", 30 June 2013, article "自密实混凝土用原材料与试验方法", pages: 18 * |
| 郭保林: "硬化混凝土气泡特征参数与冻融耐久性的关联分析", 《公路交通科技》, vol. 30, no. 1, 31 January 2013 (2013-01-31), pages 81 - 82 * |
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Application publication date: 20140416 |