CN1645138A - Tester and testing method for cement-base material cracking and contracting characleristics - Google Patents
Tester and testing method for cement-base material cracking and contracting characleristics Download PDFInfo
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- CN1645138A CN1645138A CN 200510018137 CN200510018137A CN1645138A CN 1645138 A CN1645138 A CN 1645138A CN 200510018137 CN200510018137 CN 200510018137 CN 200510018137 A CN200510018137 A CN 200510018137A CN 1645138 A CN1645138 A CN 1645138A
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Abstract
A test method includes forming test sample by model A and detecting out the first cracking time of test sample by detection circuit under constraint state, forming test sample by mode B and detecting out shrinkage property of test sample by measuring calipers under the constrant state, using the wedging on model A to ensure cracking position and utilizing micrometer on calipers to measure out shrinking performance. The device for realizing the method can test both of cracking and shrinking properties at the same time.
Description
Technical field
The present invention relates to that a kind of test water cement-based material shrinks and the apparatus and method of cracking performance under constraint condition.
Background technology
Portland cement is updated its high-strength and epistasis energy early for satisfying modern construction requirement, but the intrinsic weakness of cement---shrink with the cracking problem more serious.The contraction and the cracking problem that repeatedly occur in frequent relevant accident, the especially Important Project that occurs in the engineering make relevant research become one of most important problem in the present cement-based material research.First cracking time and the shrinkage of research cement-based material under restrained condition is significant to addressing the above problem, and a large amount of correlative study method and proving installation have therefore occurred.But there are relative deficiency in existing apparatus and method, mainly show isolating mutually of test and evaluation method, complicated operation and result's reliability is reduced, and there are limitation greatly in some test and evaluation method.
The device of existing research cement-based material first cracking time mainly contains: elliptical ring proving installation, core shift ring test device, concrete cracking frame proving installation, and the annulus proving installation that more early occurs etc.Its defective mainly is that apparatus structure complexity, test result regularity are strong, error is big, with other dependence tests result's comparability difference and test operation inconvenience etc.
Existing cement shrinkage research method and device mainly contain the free linear shrinkage test and the evaluation method of regulations such as JC/T453, JC/T603, JC 313, the theoretical shrinkage of this method research cement self, ivory-towered cement applications environment.And in fact, the effect of the various restraints that the cracking of cement-based material and shrinkage are subjected to existing in the environment, therefore, the free linear shrinkage performance that draws according to national standard method can not connect exactly with the cracking performance that actual engineering is concerned about usually.Simultaneously, according to JC/T453 test and the just structural strain performance under the warp-wise restrictive condition calculated, there is gap with cracking performance under the cement practical application condition.Up to the present, do not see the report of research shrinkage under tangential and the common restrained condition of vertical direction as yet.
Summary of the invention
The purpose of this invention is to provide a kind of first cracking time that can detect cement-based material simultaneously and the apparatus and method of shrinkage, this device can detect first cracking time and the shrinkage of cement-based material under tangential and the common constraint condition of vertical direction simultaneously, the relation of both performances be can estimate under the same conditions, the shrinkability of cement-based material self and the interaction of its cracking sensitivity in hardening process more fully understood.
The proving installation of a kind of cement-based material cracking of the present invention and shrinkage by being placed in mould A and test circuit, the mould B on the same base plate and measuring slide calliper rule and form, is seen accompanying drawing 1; Mould A is made up of annulus and removable outer toroid in the restriction, and arranged outside of annulus has an outstanding wedge in it, sees accompanying drawing 2; Test circuit is by painted thin copper wire, power supply, timer and be connected lead and form series loop; Mould B is made up of annulus and dismantled and assembled outer shroud in the restriction, is provided with two vertical baffles between annulus and the dismantled and assembled outer shroud in restriction, and the center position of every baffle plate is being settled gauge head, sees accompanying drawing 3; The gauge head shape is seen accompanying drawing 5; Measure slide calliper rule and be made up of clock gauge, slide calliper rule and spring, slide calliper rule are stuck in two gauge head tops, see accompanying drawing 4.
The proving installation of described cement-based material cracking and shrinkage, the inner and outer ring diameter of its mould B is bigger than the inner and outer ring diameter of mould A, and equates with ring specimen girth by mould A moulding by the breach ring specimen arc length of mould B moulding.
The diameter of annulus is that the diameter of 26.65cm, dismantled and assembled outer toroid is 34.65cm in the restriction of described mould A, and the distance between the inner and outer rings is 4cm, at the side bottom side length and the high isosceles triangle that is 0.3cm of an outstanding wedge of interior ring arranged outside.
The diameter of annulus 7 is that the diameter of 27.65cm, dismantled and assembled outer toroid 8 is 35.65cm in the restriction of described mould B, distance between the inner and outer ring is 4cm, the vertical baffle that to be provided with two thickness be 0.5cm between two rings, camber line between the two baffle plate centers (with the middle ring camber line radian between two annulus) clear distance is 2.15cm, and the center position of every baffle plate has the aperture of a diameter 0.6cm.
The mould A and the mould B of this proving installation make by stainless steel, and annulus all is fixed on the stainless steel base plate in its restriction, and gauge head is copper
Device using method of the present invention is: by mould A moulding cement paste or mortar specimen, after the sample sclerosis, remove outer toroid, and first cracking time of employing test circuit test sample, concrete grammar is to adopt glue that fine copper wire is sticked on the corresponding wedge of ring specimen lateral surface place, connect the copper cash two ends and form series loop with power supply, timer, and the composition test circuit, when sample ftractureed, fine copper wire disconnected, the loop also disconnects, the cracking time of sample under the timer record; Simultaneously, by mould B moulding sample, and adopt and measure the shrinkage of slide calliper rule test sample under constraint condition, at first two gauge heads are placed in respectively in the aperture of two plate washers, moulding cement paste or mortar specimen are removed outer toroid and baffle plate after the sample sclerosis then, obtain the annular sample of breach, adopt the measurement slide calliper rule to be stuck in two gauge head tops, the clock gauge on the slide calliper rule tests out the variable in distance between two gauge heads, and spring can guarantee measuring accuracy.
Description of drawings
Fig. 1 is the schematic top plan view of single unit system of the present invention;
Fig. 2 is the schematic perspective view of mould A;
Fig. 3 is the schematic perspective view of mould B;
Fig. 4 is a floor map of measuring slide calliper rule 9;
Fig. 5 is the schematic perspective view of gauge head.
Among the figure: annulus in the restriction of 1 mould A; The dismantled and assembled outer shroud of 2 mould A; 3 power supplys; 4 timers; 5 wedges; 6 fine copper wires; Annulus in the restriction of 7 mould B; The dismantled and assembled outer shroud of 8 mould B; 9 measure slide calliper rule; 10 gauge heads; 11 baffle plates; 12 base plates; 13 clock gauges; 14 springs.
Embodiment
1, the making of the proving installation of cement-based material cracking and shrinkage
The proving installation such as the accompanying drawing 2 of cement-based material cracking, the diameter that the diameter of the interior annulus 1 of the restriction of mould A is designed to 26.65cm, dismantled and assembled outer toroid 2 is designed to 34.65cm, distance between the inner and outer rings is 4cm, at side bottom side length of interior ring arranged outside and the high outstanding wedge 5 of isosceles triangle that is 0.3cm;
Test circuit is by painted thin copper wire, power supply, timer and be connected lead and form, and enamel covered wire can adopt the fine copper wire in the common multiply copper core electric wire;
The proving installation of cement-based material shrinkage such as accompanying drawing 3, the diameter that interior annulus 7 diameters of the restriction of mould B are designed to 27.65cm, dismantled and assembled outer toroid 8 is designed to 35.65cm, distance between the inner and outer ring is 4cm, the vertical baffle 11 that two thickness are set is 0.5cm between two rings, camber line between the two baffle plate centers (with the middle ring camber line radian between two annulus) clear distance is 2.15cm, and the center position of every baffle plate has the aperture of a diameter 0.6cm;
Two groups of moulds are made by stainless steel, and annulus all is fixed on the stainless steel base plate 12 in its restriction, and gauge head is copper.
2, the proving installation using method of cement-based material cracking and shrinkage
Adopt mould A moulding cement paste or mortar specimen, after the sample sclerosis, remove outer toroid, as accompanying drawing 1.Adopt the super glue of waterproof that fine copper wire 6 is sticked on the corresponding wedge of ring specimen lateral surface 5 places, connect the copper cash two ends and with power supply 3, timer 4 forms series loop, and composition test circuit, the joint sand papering of copper cash two ends, remove insulation course, electronic timer can utilize electronic watch, the quartz watch repacking, method is: power supply is taken out, originally an electrode (negative or positive electrode) that will connect power supply in will showing with lead links to each other with an end of test copper cash, another electrode is linked to each other with the other end of test copper cash with power supply series connection back, when copper cash was broken, the loop disconnected, when timer stops to walk and demonstrate time of cracking.
Simultaneously, two gauge heads 10 are placed in respectively in the aperture of two plate washers 11, adopt mould B moulding sample then, after the sample sclerosis, remove outer toroid and baffle plate, obtain the annular sample of breach, adopt measurement slide calliper rule 9 to be stuck in two gauge heads, 10 tops, clock gauge 13 tests out the variable in distance between two gauge heads, and spring 14 can guarantee measuring accuracy.
Apparatus of the present invention since the tensile strength of fine copper wire much smaller than the differential expansion stress of cement-based material, so when the cement based hardenite ftractureed and breaks copper cash, copper cash can not exert an influence to cracking time.
Though the circle diameter of mould B is bigger than the circle diameter of mould A, B is provided with two and cuts off baffle plates, so equate with ring specimen girth by the A moulding by the breach annular sample arc length of B moulding, is convenient to contrast two kinds of test results like this; The circumferential length and the arc length at two sample centers are 90cm, for 5 times of the free linear expansivity specimen length of test in the related standards such as JC 453, so also are convenient to the experimental result of methods such as this experimental result and JC 453 is contrasted; Mould A goes up the outstanding wedge that is provided with can guarantee that sample ftractures herein, and accelerates crack velocity, raising testing efficiency; Shrinkage under the constraint condition, the volume change that is sample in the different length of times are passed to slide calliper rule by two gauge heads, and are recorded by clock gauge fixing on the slide calliper rule.
To test cracking and inotropic two covering devices and put together, can in the same application environment, compare the mutual relationship of two kinds of performances, and make reliability of testing result stronger; Simultaneously, utilize the test result of shrinkage to make a prediction to first cracking time, because between the longer-term that first cracking time appears at tens hours to tens days usually, therefore this prediction can make the test of first cracking time easier.
Claims (8)
1, the proving installation of a kind of cement-based material cracking and shrinkage, it is characterized in that device is by being placed in mould (A) and test circuit, the mould (B) on the same base plate (12) and measuring slide calliper rule and form, mould (A) comprises the interior annulus (1) of the restriction of mould (A), the dismantled and assembled outer shroud of mould (A) (, 2), the arranged outside of interior ring (1) has an outstanding wedge (5); Test circuit is by fine copper wire (6), power supply (3), timer (4) and be connected the series loop that lead is formed; Mould (B) comprises the interior annulus (7) of the restriction of mould (B), the dismantled and assembled outer shroud (8) of mould (B), be provided with two vertical baffles (11) between annulus (7) and the dismantled and assembled outer shroud (8) in restriction, the center position of every baffle plate (11) is being settled gauge head (10); Measure slide calliper rule and be made up of clock gauge (13), slide calliper rule (9) and spring (14), slide calliper rule (9) are stuck in the variable in distance between two gauge heads of two gauge heads (10) top test.
2, cracking according to claim 1 and shrinkage proving installation, the inner and outer ring diameter that it is characterized in that mould (B) is bigger than the inner and outer ring diameter of mould (A), and the breach ring specimen arc length by mould (B) moulding equates with ring specimen girth by mould (A) moulding.
3, cracking according to claim 1 and shrinkage proving installation, the diameter that it is characterized in that the interior annulus (1) of constraint of mould (A) is that the diameter of 26.65cm, dismantled and assembled outer toroid (2) is 34.65cm, distance between the inner and outer rings is 4cm, at the side bottom side length and the high isosceles triangle that is 0.3cm of the outstanding wedge (5) of interior ring arranged outside.
4, cracking according to claim 1 and shrinkage proving installation, the diameter that it is characterized in that the interior annulus (7) of restriction of mould (B) is that the diameter of 27.65cm, dismantled and assembled outer toroid (8) is 35.65cm, distance between the inner and outer ring is 4cm, the vertical baffle (11) that to be provided with two thickness be 0.5cm between two rings, camber line clear distance between the two baffle plate centers is 2.15cm, and the center position of every baffle plate has the aperture of a diameter 0.6cm.
5, cracking according to claim 1 and shrinkage proving installation is characterized in that mould (A) and mould (B) make by stainless steel,
6, cracking according to claim 1 and shrinkage proving installation is characterized in that described gauge head is that copper gauge head (10) is for copper.
7, method with the described device to test cement-based material of claim 1 first cracking time under constraint condition, it is characterized in that adopting mould (A) moulding cement paste or mortar specimen, after the sample sclerosis, remove outer toroid, the super glue of employing waterproof sticks on the corresponding wedge of ring specimen lateral surface (5) with fine copper wire (6) and locates, connect the copper cash two ends and with power supply (3), timer (4) forms series loop, and composition test circuit, timer adopts the electronic timer with stop watch function, the negative or positive electrode that will connect power supply in will showing with lead links to each other with an end of test copper cash, will another electrode and power supply series connection back link to each other with the other end of testing copper cash.
8, use the method for the described device to test cement-based material of claim 1 shrinkage under constraint condition, it is characterized in that at first two gauge heads (10) being placed in respectively in the aperture of two plate washers (11), adopt mould (B) moulding cement paste or mortar specimen then, after the sample sclerosis, remove outer toroid (8) and baffle plate (11), obtain the annular sample of breach, adopt and measure the variable in distance that slide calliper rule are tested two gauge heads.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200510018137 CN1287149C (en) | 2005-01-12 | 2005-01-12 | Tester and testing method for cement-base material cracking and contracting characleristics |
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| CN 200510018137 CN1287149C (en) | 2005-01-12 | 2005-01-12 | Tester and testing method for cement-base material cracking and contracting characleristics |
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| CN1645138A true CN1645138A (en) | 2005-07-27 |
| CN1287149C CN1287149C (en) | 2006-11-29 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101526519A (en) * | 2009-03-02 | 2009-09-09 | 深圳市市政工程总公司 | Test method of performance of asphalt mixture after crushing coarse aggregates |
| CN1866004B (en) * | 2006-06-09 | 2010-05-12 | 宁波工程学院 | Test method for crack-resistant performance of concrete and outside-square inside-round test apparatus therefor |
| CN102798707A (en) * | 2012-09-09 | 2012-11-28 | 中国水利水电第三工程局有限公司 | Concrete restrained contraction ring crack resistance test device and test method |
| CN110208504A (en) * | 2019-05-31 | 2019-09-06 | 华南理工大学 | A kind of fiber concrete ring type constrained crack-ing device of chemistry optimization |
-
2005
- 2005-01-12 CN CN 200510018137 patent/CN1287149C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1866004B (en) * | 2006-06-09 | 2010-05-12 | 宁波工程学院 | Test method for crack-resistant performance of concrete and outside-square inside-round test apparatus therefor |
| CN101526519A (en) * | 2009-03-02 | 2009-09-09 | 深圳市市政工程总公司 | Test method of performance of asphalt mixture after crushing coarse aggregates |
| CN101526519B (en) * | 2009-03-02 | 2013-05-15 | 深圳市市政工程总公司 | Test method of performance of asphalt mixture after crushing coarse aggregates |
| CN102798707A (en) * | 2012-09-09 | 2012-11-28 | 中国水利水电第三工程局有限公司 | Concrete restrained contraction ring crack resistance test device and test method |
| CN102798707B (en) * | 2012-09-09 | 2014-08-13 | 中国水利水电第三工程局有限公司 | Concrete restrained contraction ring crack resistance test device and test method |
| CN110208504A (en) * | 2019-05-31 | 2019-09-06 | 华南理工大学 | A kind of fiber concrete ring type constrained crack-ing device of chemistry optimization |
| CN110208504B (en) * | 2019-05-31 | 2021-10-26 | 华南理工大学 | Fiber concrete annular restraint cracking device of chemistry optimization |
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| Publication number | Publication date |
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| CN1287149C (en) | 2006-11-29 |
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