A kind of architectural engineering cement concrete self-shrinkage measuring device
The present invention relates to a kind of measuring devices, more particularly, to a kind of measuring device of concrete self-shrinkage.
Concrete refers to will be gathered materials the cementing general designation for closing all engineered composite materials by cementitious material.The coagulation usually said
A native word, which refers to, makees cementitious material with cement, and sand, masonry gather materials；Match by a certain percentage with water, it is agitated, molding, maintenance and
The cement concrete obtained.
Concrete shrinkage is the characteristic of concrete material inherently.The contraction of concrete refers to due to contained in concrete
The contracting of macroscopic view volume caused by the factors such as variation, chemical reaction and the temperature change of moisture.When concrete in a free state, mix
Solidifying soil, which is shunk, not will lead to adverse consequences.In actual engineering, concrete structure can be located by basis, reinforcing bar or adjacent part containing
In different restrained conditions, cause concrete pulling stress, since concrete tensile strength is not high, concrete shrinkage crack is easily produced
It is raw.The generation of distress in concrete gently then influences the bearing capacity and service life of structure, heavy then will lead to catastrophic accident, gives
National economy brings massive losses, carrys out grave danger to people's safety belt.
China is in rapid economic development period at present, and infrastructural project amount is very huge, the annual consumption of concrete
Also it increases rapidly, if not solving the problems, such as that the generally existing contraction of concrete and crack resistance are bad, our infrastructural project
Quality will be without collateral security.Therefore, the research of concrete shrinkage is constantly subjected to the attention of domestic and international academia and engineering circles.
In the prior art, concrete shrinkage is mainly measured by volumetric method or displacement method, by mixed for shrinking front and back
Coagulate the volume change of soil or the self-constriction of length measure of the change concrete.In conventional volumetric method test, such as Chinese architecture material
Expect that the total institute of scientific research in 201410398887.4 patent of invention, injects water into measurement cabinet, passes through observed stage
Variation determines the variation of measurement cabinet inner concrete volume.But since water can enter in volume of concrete, influence concrete
Self-constriction characteristic leads to the result measured and there are difference in actual environment.In some improved technical solutions, replaced using oil
Injection liquid of the water as measurement case is changed, but still the shrinkage of concrete can be had an impact.
Summary of the invention
As one aspect of the present invention, a kind of architectural engineering cement concrete self-shrinkage measuring device is provided, comprising:
Test specimen accommodates cabinet, for accommodating cement concrete test specimen, is provided with unlatching door, can be by coagulating cement by the unlatching door
Native test specimen is placed in the test specimen storage case body；The test specimen accommodates cabinet and is provided with gas access, passes through the gas energy
It is enough that gas is inputted into the test specimen receiving cabinet, make that there is sufficiently high air pressure in it；The test specimen accommodates cabinet and passes through balance
Pipeline is communicated with reading container, the balance pipe road setting air pressure balance piston；The reading container setting setting spiral pushes away
Enter bar interface, internal screw thread is arranged in the spiral push rod interface；External screw thread, the spiral push rod and institute is arranged in spiral push rod
State the connection of spiral push rod interface thread；The balance pipe road setting equalization point coordinate, the reading container outer surface setting
Read text scale can determine the retraction volume of cement concrete test specimen by equalization point coordinate and the read text scale.
Preferably, sealing rubber cover is arranged in spiral push rod top, and the spiral push rod interface is made to keep airtight
Preferably, the test specimen accommodates cabinet and the reading container and is in closed state in measurement process.
It preferably, further include multiple air-tightness fillers, the filler length and test specimen accommodate the short side of the bottom of box
Equal, width is the 1/N for the long side that test specimen accommodates the bottom of box, the 1/M of box height is highly accommodated for test specimen, wherein M, N are
Integer greater than 1.
Preferably, the air-tightness filler is hollow resin block.
Preferably, box volume is accommodated according to test specimen volume and test specimen, determines that the air-tightness for being put into test specimen storage case is filled out
Fill the number of object.
Preferably, the volume that cabinet is accommodated according to the initial volume of cement concrete test specimen and test specimen, air-tightness is filled out
It fills object to be placed in test specimen storage case body, make after placing air-tightness filler and cement concrete test specimen, test specimen accommodates cabinet
Interior residual volume is less than the 1/4 of its total volume.
Preferably, the reading volume of a container is less than the test specimen accommodates cabinet 1/4.
Preferably, gas is injected by the gas access that test specimen accommodates cabinet in measurement, its air pressure inside is made to be greater than mark
Quasi- atmospheric pressure.
Preferably, the reading container includes the different the first part and the second part of sectional area, second section
For product less than first, the spiral push rod interface is set to described second.
Preferably, 1/4 of second sectional area less than first.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the architectural engineering cement concrete self-shrinkage measuring device of the embodiment of the present invention.
In order to illustrate more clearly of technical solution of the present invention, embodiment will be used simply to be situated between the present invention below
Continue, it should be apparent that, be described below in be only one embodiment of the present of invention, for those of ordinary skill in the art come
It says, without any creative labor, other technical solutions can also be obtained according to these embodiments, also belonged to
Disclosure of the invention range.
The architectural engineering cement concrete self-shrinkage measuring device of the embodiment of the present invention, referring to Fig. 1, including test specimen storage case
Body 1 balances pipeline 2, air pressure balance piston 3, reading container 4, spiral push rod 5 and compressed air unit 6.
Test specimen accommodates cabinet 1, for accommodating cement concrete test specimen, be provided with open door 11, test specimen supporting element 12 with
And gas access 13.It opens door 11 and is used to for cement concrete test specimen 7 to be placed in test specimen and accommodate in cabinet 1, opening door 11 can be with
It is set to top or side that test specimen accommodates cabinet 1.Test specimen supporting element 12, can be with for placing cement concrete test specimen 7
It is test specimen to be arranged in accommodate the supporting support of 1 bottom of cabinet, or the hanging bracket that test specimen accommodates 1 top of cabinet is arranged in.
Preferably, when using supporting support as test specimen supporting element 12, polyvinyl chloride plastic film flexible is set in its top layer
Layer reduces restraining force to reduce absorption of the concrete for supporting element.
The gas access 13 that test specimen accommodates cabinet 1 is communicated with compressed air unit 6, can be by gas by gas access 13
It inputs test specimen to accommodate in cabinet 1, makes that there is sufficiently high air pressure in it, which may be greater than normal atmosphere
Pressure, it is preferred that such as 2 times or 3 times of standard atmospheric pressures.Pressure gage can be set in test specimen storage case body, for detecting it
Interior gas pressure intensity.
Test specimen accommodates cabinet 1 and is communicated by balance pipeline 2 with reading container 4, and balance pipeline 2 is transparent pipeline, can be made
Use such as transparent resin as balance 2 material of pipeline.It balances and air pressure balance piston 3 is set in pipeline 2, balance 2 midpoint of pipeline is set
Set equalization point coordinate 21.Dummy piston 3 is I-shape construction, in left and right when pressure imbalance, can be moved directly along balance pipeline 2
To left and right pressure balance.
Reading container 4 includes different first 41 and second 42 of sectional area, wherein second 42 sectional area is small
In first 41.First 41 of reading container 4 accommodates cabinet 1 with test specimen by balance pipeline 2 and communicates.Read the of container 4
Internal screw thread is arranged in two 42 setting spiral push rod interfaces 43,43 inner surface of spiral push rod interface.Spiral push rod 5 is arranged outer
Screw thread is threadedly coupled with spiral push rod interface 43.Sealing rubber cover is arranged in 5 top of spiral push rod, connects spiral push rod
Mouth 43 keeps air-tightness.
Second 42 outer surface is provided with scale, indicates the volume of reading container 4, passes through 5 phase of screw thread push rod
For the position of scale, reading volume of a container can determine.
After cement concrete test specimen 7 is put into test specimen receiving cabinet 1, cabinet 1 is accommodated to test specimen by compressed air unit 6
Gas injection, until barometrical value reaches specified air pressure.Then, spiral push rod 5 is adjusted in spiral push rod interface 43
Position, until the midpoint of dummy piston 3 be located at balance pipeline 2 equalization point coordinate 21, at this time test specimen accommodate cabinet 1 and reading
Air pressure in container 4 is equal, records the scale V of spiral push rod interface 43 at this time1.Due to cement concrete test specimen 7 from
It shrinks, the gas volume increase that test specimen accommodates cabinet 1 causes pressure to reduce, and dummy piston 3 is by gas pressure intensity in reading container 4
Left and right be moved to the left.After being spaced specific period, it is turned out spiral push rod 5, makes to read the increase of 4 inner volume of container, put down
Weighing apparatus piston 3 moves right again, until the midpoint of dummy piston 3 is located at the equalization point coordinate 21 of balance pipeline 2, test specimen storage case
Air pressure in body 1 and reading container 4 is in balance again, records the scale V of spiral push rod interface 43 at this time2.According to V1, V2,
Test specimen accommodates 1 volume Vs of cabinet, the initial volume Vc of cement concrete test specimen 7, that is, can determine cement concrete test specimen 7 at this time
Volume Vt=Vs- V2 (Vs-Vc)/ V1, so that it is determined that the shrinkage V=Vc-Vt of cement concrete test specimen 7 at this time.In difference
At the time of measure cement concrete test specimen 7 shrinkage, can determine the Self-Shrinkage Property of cement concrete test specimen 7.
Since the volume of different concrete test blocks is different, for the concrete test block of small volume, test specimen is accommodated in cabinet 1
Volume of air it is larger, and cause volume change caused by the self-constriction of concrete test block relative to volume of air ratio compared with
It is small, it is inadequate so as to cause measurement result precision.Preferably, architectural engineering cement concrete self-shrinkage measuring device can also include
Multiple air-tightness fillers, length is equal with the test specimen receiving short side of 1 bottom of cabinet, and width is that test specimen accommodates 1 bottom of cabinet
Long side 1/N, the 1/M of 1 height of cabinet is highly accommodated for test specimen, wherein M, N are the integer greater than 1.It can be used for example empty
Heart resin mass is as air-tightness filler.After concrete sample to be put into test specimen and accommodates cabinet 1, according to concrete sample volume
And test specimen accommodates 1 volume of cabinet, determines the number for being put into the air-tightness filler of test specimen storage case 1.Preferably, according to cement
The initial volume and test specimen of concrete sample accommodate the volume of cabinet, and air-tightness filler is placed in test specimen and accommodates cabinet
It is interior, make after placing air-tightness filler and cement concrete test specimen, the intracorporal residual volume of test specimen storage case is less than its totality
Long-pending 1/4.Setting in this way, make measurement when concrete test block variation relative to test specimen accommodate 1 volume of air of cabinet compared with
Greatly, so as to improving the precision of measurement result.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the scope of the present invention.This hair
Particular features, structures, materials, or characteristics described in bright can be in any one or more of the embodiments or examples with suitable
Mode combines.In addition, without conflicting with each other, those skilled in the art can be by difference described in this specification
The feature of embodiment or example and different embodiments or examples is combined.It is all the spirit and principles in the present invention it
Interior any modification, equivalent replacement, improvement and so on, are included within the scope of protection of the present invention.