CN1609614A - Method for measuring plastic contraction rate of cement-base material - Google Patents
Method for measuring plastic contraction rate of cement-base material Download PDFInfo
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- CN1609614A CN1609614A CN 200410067055 CN200410067055A CN1609614A CN 1609614 A CN1609614 A CN 1609614A CN 200410067055 CN200410067055 CN 200410067055 CN 200410067055 A CN200410067055 A CN 200410067055A CN 1609614 A CN1609614 A CN 1609614A
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Abstract
The plastic shrinkage determining process for cement based material is suitable for cement based material as well as similar materials, such as lime, gypsum, water glass, etc. The present invention adopts non-contact length measuring apparatus and the sum of changes on two sheets of glass plate as the length change between two side point span. The said non-contact length measuring apparatus includes two optical microscopes of reading precision 0.1 micron, two test glass sheets with scale in the precision of 0.05 mm, and one 3D adjustable support. The present invention may be used in the measurement, research, development, production and other aspects of cement material and similar materials.
Description
Technical field
The present invention relates to the assay method of cement-based material, especially the method for testing that refers to the plastic contraction rate under a kind of cement-based material and the similar material mecystasis thereof, the aspect such as research, exploitation, production, application that can be used for cement-based material and similar material thereof, to measure the plastic contraction rate of material, the performances such as cracking resistance of evaluation material.
Background technology
Cement concrete material is the most large manufactured construction materials of widespread use in the present Structural Engineering, and himself still exists some defectives, as be easy to that plastic shrinkage cracking, tensile strength are low, poor toughness etc., limited it and in engineering, used widely.At cement concrete material the sclerosis before, because the cracking phenomena that causes is shunk in the plasticity dehydration, people have carried out improving the research of the anti-plastic shrinkage cracking performance of cement concrete material, studied admixture polypropylene film-fibre in cement-based material as ParvizSorushian, and different surface modification methods is to the material plastic contraction crack Effect on Performance; MiroslawGrzybowski and S.P.Shah adopt ring method to study in concrete admixture steel fibre and mekralon to the influence of plastic shrinkage cracks width; Youjiang Wang, VictorC.Li and Stanley Backer have studied the influence to composite material tensile strength of the human relations of in cement based admixture virtue, tygon and mekralon with direct pulling method, and studied anti-plastic shrinkage cracking performance of fiber etc. with ring method, horse one equality has been studied cement matrix parameter, fiber parameter, experiment condition parameter to cement-based material plastic shrinkage cracking Effect on Performance, and its plastic shrinkage cracking mechanism is studied.Studies show that more than the adding of fiber material can be in anti-plastic shrinkage cracking performance of improving cement-based material in varying degrees etc. in cement-based material.
Summary of the invention
The objective of the invention is to design set up a kind of can the test water cement-based material and the method for similar material plastic contraction rate.
The technical scheme of method of testing that the present invention solves cement-based material and similar material plastic contraction rate thereof is as follows:
1. experiment utensil
The mortar die trial: adopting internal diameter is the wooden model of 910 * 610 * 20mm.The plastic sheeting in shop prevents that moisture from oozing out earlier, again the reinforcing bar of φ 8mm is made rectangle frame and put into wooden model, four limits and wooden model frame be at a distance of 20mm, and four jiaos are worked the center section that makes it to be in the wooden model height with the high support foot pad of 6mm, in order to avoid reinforcing bar and wooden model bottom directly contacts, as shown in Figure 1.
The concrete die trial: on the basis of mortar die trial, wooden frame that internal diameter is 910 * 610 * 100mm of cover is completed plastic sheeting above, and original reinforcing steel bar frame ties up the rectangular parallelepiped of high about 34mm, and four jiaos are risen with the high strut angle pad of 33mm.
Daylight lamp: 1Kw places overhead about 1.5m place during experiment.
Fan: the about 5m/s of wind speed.
Contactless measuring motion: the reading accuracy by two reading accuracy optical microscope that is 0.1 μ m, two band scales is that the glass coupon of 0.05mm, the bracing frame of a removable adjusting of three-dimensional are formed.
2. experimental technique
The good sand of weighing, stone and cement added in the stirring machine simultaneously (then add fiber and other material simultaneously) for fibre mortar etc., elder generation's dry mixing 1 minute, add measured water, continued stir about 2 minutes, stop to stir, to be bonded at and fail to obtain well-beaten material on the stirring machine and scrape, continue stir about again 30 seconds or till mixing.Then will mix and stir material and pour into a mould to the center, till mixing and stirring the full whole die trial of the automatic stream of material, wipe the test specimen surface with wipeing long stuff off fast off along the long limit of die trial immediately along the wooden model edge is spiral.In the glass test pieces that two band scales are placed on the test specimen surface, the spacing between two is 626mm.Open the electric fan (wind speed is about 5m/s) that is positioned at the die trial minor face immediately, open the 1KW iodine-tungsten lamp that is positioned at about 1.5m place, two back gauge ground, the long limit of die trial simultaneously.The non-contact measurement growth device that employing is developed is voluntarily measured the initial scale reading on two glass coupon, have certain space between microscope camera lens and the glass sheet this moment, reading is accurate to 0.1 μ m, and every then interval 15min measures single reading, till the test specimen plastic shrinkage is basicly stable.With the plastic shrinkage amount of the length variations value sum on two glass coupon,, represent the plastic contraction rate of test specimen with the form of microstrain divided by the initial length of point-to-point transmission as test specimen.
Description of drawings
Fig. 1 is a mortar die trial synoptic diagram of the present invention.
Fig. 2 is the I-I sectional view of Fig. 1.
Label declaration in the accompanying drawing:
The 1-wooden model; The 2-reinforcing steel bar frame;
Embodiment
Below by embodiment the present invention is further described.
Embodiment 1 adopts the mortar die trial, in 32.5 Portland cements: sand: the ratio (mass ratio) of water=1: 1: 0.5 stirs in mortar mixer, be cast in then in the mould, record its plastic contraction rate by above-mentioned experimental technique with the contactless horizontal metroscope of self-control and be about 3600 microstrains.
Embodiment 2 adopts the mortar die trial, in 32.5 Portland cements: sand: the ratio (mass ratio) of water=1: 1: 0.5, mix the mekralon material of mortar volume 0.10% simultaneously, in mortar mixer, stir, be cast in then in the mould, record its plastic contraction rate by above-mentioned experimental technique with the contactless measuring motion of self-control and be about 1300 microstrains.
Embodiment 3 adopts the mortar die trials, earlier by 32.5 Portland cements: sand: the ratio (mass ratio) of water=1: 1: 0.5, an amount of retardant of admixture stirs in mortar mixer simultaneously, and it is interior floating to be cast in mould then.Behind layer overlay plastic sheeting on the retarding mortar, overlap the last layer wooden frame again, make upper strata and lower floor shape, size the same, cast and the same proportioning of lower floor therein, but do not mix the mortar of retardant, do not place reinforcing steel bar frame in the mortar of upper strata this moment, can make the upper strata mortar like this under lower floor's mortar buoyancy, carry out plastic shrinkage with unconfined accurate free state.Record the accurate free state plastic contraction rate of sand-cement slurry by above-mentioned experimental technique with the contactless measuring motion of self-control and be about 12000 microstrains.
Embodiment 4 adopts the concrete die trial, in 32.5 Portland cements: sand: stone: water=1: 0.5: 0.5: 0.5 ratio (mass ratio) stirs in concrete mixer, be cast in then in the mould, record its plastic contraction rate by above-mentioned experimental technique with the contactless measuring motion of self-control and be about 1500 microstrains.
Embodiment 5 adopts the concrete die trial, in 32.5 Portland cements: sand: stone: water=1: 0.5: 0.5: 0.5 ratio (mass ratio), mix the mekralon material of volume of concrete 0.10% simultaneously, in concrete mixer, stir, be cast in then in the mould, record its plastic contraction rate by above-mentioned experimental technique with the contactless measuring motion of self-control and be about 500 microstrains.
Claims (2)
1, a kind of assay method of plastic contraction rate of cement-base material is characterized in that:
Adopt contactless measuring motion to carry out non-cpntact measurement, wherein, the plastic shrinkage of cement-based material is out of shape with the changing value sum on the glass sheet of two band scales as its length deformation amount between both sides point span.
2, a kind of assay method of plastic contraction rate of cement-base material is characterized in that:
Described contactless measuring motion is that the glass coupon of 0.05mm, the bracing frame of a removable adjusting of three-dimensional are formed by the reading accuracy of two reading accuracy optical microscope that is 0.1 μ m, two band scales.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 200410067055 CN1609614A (en) | 2004-10-11 | 2004-10-11 | Method for measuring plastic contraction rate of cement-base material |
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| CN 200410067055 CN1609614A (en) | 2004-10-11 | 2004-10-11 | Method for measuring plastic contraction rate of cement-base material |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102866245A (en) * | 2012-09-17 | 2013-01-09 | 中国建筑科学研究院 | Test method and test device for unrestraint measurement of concrete deformation performance |
| CN105044316A (en) * | 2015-08-20 | 2015-11-11 | 哈尔滨工业大学 | Compound contraction measurer for embedded type cement-base material |
| CN105758885A (en) * | 2016-03-11 | 2016-07-13 | 上海市建筑科学研究院 | Method of detecting vertical expansivity of pulverized coal ash |
-
2004
- 2004-10-11 CN CN 200410067055 patent/CN1609614A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102866245A (en) * | 2012-09-17 | 2013-01-09 | 中国建筑科学研究院 | Test method and test device for unrestraint measurement of concrete deformation performance |
| CN102866245B (en) * | 2012-09-17 | 2015-04-22 | 中国建筑科学研究院 | Test method and test device for unrestraint measurement of concrete deformation performance |
| CN105044316A (en) * | 2015-08-20 | 2015-11-11 | 哈尔滨工业大学 | Compound contraction measurer for embedded type cement-base material |
| CN105758885A (en) * | 2016-03-11 | 2016-07-13 | 上海市建筑科学研究院 | Method of detecting vertical expansivity of pulverized coal ash |
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Open date: 20050427 |