CN105044315B - The crack-resistant performance of concrete test device and method of testing that a kind of constraint degree is variable - Google Patents
The crack-resistant performance of concrete test device and method of testing that a kind of constraint degree is variable Download PDFInfo
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- CN105044315B CN105044315B CN201510468419.4A CN201510468419A CN105044315B CN 105044315 B CN105044315 B CN 105044315B CN 201510468419 A CN201510468419 A CN 201510468419A CN 105044315 B CN105044315 B CN 105044315B
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Abstract
The invention discloses the variable crack-resistant performance of concrete test device of a kind of constraint degree and method of testing.Wherein test device includes the concrete mould with internal ring and outer shroud, the annulus chamber of concrete is formed between described internal ring and outer shroud, it is characterized in that: also include a constraint controller, this constraint controller includes thermal source and makes described internal ring expanded by heating by the heating of described thermal source and act on the temperature control heating chamber of concrete inner surface, and this temperature controls heating chamber and is positioned at described internal ring.Compared with prior art, present configuration is simple, and convenient disassembly is reusable.Device can be greatly shortened the concrete cracking time according to presetting change internal ring constraint degree, evaluate the cracking resistance of concrete by comparing the difference of concrete cracking time, and package unit can form self-circulation system, saves the energy.It is applicable to scientific research and the job site mensuration to concrete early-stage crack resistance, is with a wide range of applications.
Description
Background field
The present invention relates to the variable crack-resistant performance of concrete test device of a kind of constraint degree and method of testing, belong to concrete construction field.
Background technology
In recent decades, cast-in-place concrete floor, beam, basement wall etc., these sizes little xoncrete structure cracking phenomena happen occasionally.The cracking resistance of concrete is one of study hotspot of current field of civil engineering.Traditional experimental study concentrates on the basic mechanical properties such as the comprcssive strength of concrete, tensile strength, elastic modelling quantity, but cracking resistance is not formed to unification and evaluation methodology effectively, therefore the test device of research test crack-resistant performance of concrete has realistic meaning.
The most conventional method of testing mainly has flat band method, ring method and single shaft leash law, and wherein ring method is because its device is simple and can guarantee that concrete is widely used by uniform hoop constraint.But traditional circle ring test device offer constraint is less and constraint degree is immutable, concrete is the most easy to crack, and sensitivity is poor, and test period is the longest, has a strong impact on efficiency and the accuracy of test.
Summary of the invention
The technical problem to be solved is for above-mentioned the deficiencies in the prior art, and it is provided with the variable crack-resistant performance of concrete test device of a kind of constraint degree and method of testing, this device assembles simple, easy to operate, the required instrument of test is few, can measure at the scene of pouring, as long as carrying out local form removal, it is not required to mobile test specimen, easy to operate reusable.
In order to realize above-mentioned technical problem, the present invention by the following technical solutions:
The crack-resistant performance of concrete test device that a kind of constraint degree is variable, including the concrete mould with internal ring and outer shroud, the annulus chamber of concrete is formed between described internal ring and outer shroud, it is characterized in that: also include a constraint controller, this constraint controller includes thermal source and makes described internal ring expanded by heating by the heating of described thermal source and act on the temperature control heating chamber of concrete inner surface, and this temperature controls heating chamber and is positioned at described internal ring.
Described thermal source is boiler and cold water storage cistern, described temperature control is annular water tank, described annular water tank is provided with water inlet and outlet, described boiler and cold water storage cistern are connected in parallel on the water inlet of described annular water tank and the outlet of annular water tank, are provided with an electromagnetic valve intaking water temperature in regulating described annular water tank at the described outlet stating boiler and cold water storage cistern.
The outlet of described annular water tank is additionally provided with a water pump.
It is provided with heater in described boiler.
Described thermal source is high-temperature gas, and described temperature control is that annular gas is distributed case.
Described thermal source is heater, and described temperature control is annular heat distribution case, and described heater is positioned at this annular heat distribution case.
Described outer shroud is made up of two semicircular ring, and the edge of semicircular ring is provided with rib, and two semicircular ring are by the detachable connection of described rib.
The crack-resistant performance of concrete method of testing that a kind of constraint degree is variable, step is as follows:
The first step: install the concrete mould with internal ring and outer shroud, and casting concrete annulus between the internal ring and outer shroud of concrete mould；
Second step: remove outer shroud after concrete annulus initial set, by increasing the constraint degree of concrete annulus by the way of heating internal ring makes internal ring expanded by heating in internal ring, accelerates concrete circular ring opening；
3rd step, record and cracking resistance that relatively different concrete cracking time i.e. draw different concrete.
Compared with prior art, the present invention has the beneficial effect that:
1, the present invention tests device and method of testing all by carrying out the concrete removing outer shroud by the way of internal ring heats.Internal ring expanded by heating after the heating also acts on the inner surface of concrete annulus, the most also circle ring inner surface can be made to synchronize to expand by the inner surface of conduction of heat heating annulus, by the constraint degree self expanding change annulus of internal ring thermal expansion and annulus, simultaneously with hydration and the dry shrinkage of concrete cement in condensing hardening process, considerably increase the tension on concrete annulus so that concrete can rapid crack propagation.Record and compare different concrete cracking time and i.e. draw the cracking resistance of different concrete.
2, the present invention tests adopting of device and uses water as thermal source, and the relatively low water recycle stream of the temperature that constraint degree controller flowed out by water pump returns to temprature control unit, forms blood circulation, saves the energy, improves conventional efficient.
3, this device assembles simply, simple to operate, and the required instrument of experiment is few, can measure at the scene of pouring, as long as carrying out local form removal, is not required to mobile test specimen, the easy to operate reusable and saving energy.
Accompanying drawing explanation
Fig. 1 is apparatus of the present invention structural representations；
Fig. 2 is ring part device schematic diagram；
Fig. 3 is ring part profile；
Reference: 1 base plate, 2 outer shrouds, 3 internal ring, 4 temperature control heating chamber, 5 water inlets, 6 outlets, 7 ribs, 8 bolts hole, 9 cold water storage cisterns, 10 boilers, 11 electric heating tubes, 12 hot water temperature sensor, 13 cold water temperature sensor, 14 leaving water temperature sensors, 15 hot water electromagnetic valves, 16 cold water electromagnetic valves, 17 controllers, 18 water pumps.
Detailed description of the invention
Below in conjunction with the accompanying drawings, the present invention will be further described:
The crack-resistant performance of concrete test device that a kind of constraint degree is variable.It is made up of circular concrete mould part peace treaty bundle controller part, as in figure 2 it is shown, solidifying clay model part is made up of base plate 1, outer shroud 2 and internal ring 3.Constraint controller part includes that the adjustable thermal source of temperature and temperature control heating chamber.Thermal source can use water, gas or other modes, it is also possible to the temperature directly formed in internal ring 3 with heater controls heating intracavity heating.
As it is shown in figure 1, the present embodiment is adopted uses water as thermal source, the constraint controller part of the present invention is elaborated: it is annular water tank that temperature controls heating chamber 4, has water inlet 5 and outlet 6 on annular water tank.
Thermal source is made up of cold water storage cistern 9, boiler 10, electric heating tube 11, hot water temperature sensor 12, cold water temperature sensor 13, leaving water temperature sensors 14, hot water electromagnetic valve 15, cold water electromagnetic valve 16, controller 17, water pump 18.Electric heating tube 11 is arranged in boiler 10, and hot water temperature sensor 12 is arranged in boiler 10, and cold water temperature sensor 13 is arranged in cold water storage cistern 9, and leaving water temperature sensors 14 is arranged on water outlet.Hot water electromagnetic valve 15 is arranged on boiler 10 exit, and cold water electromagnetic valve is arranged on cold water storage cistern 9 exit.Water pump 18 is arranged between constraint degree controller outlet 6 and temprature control unit water inlet.During test, by cold water in electric heating tube 11 heat hot water case 10, temperature on controller 17 is set to assigned temperature, controller detects boiler 10 and the water temperature of cold water storage cistern 9 respectively by hot water temperature sensor 12 and cold water temperature sensor 13, detect outlet water temperature by leaving water temperature sensors 14 simultaneously, then three water temperatures by detecting control hot water electromagnetic valve 15 and the aperture of cold water electromagnetic valve 16 respectively, to control boiler 10 and the flow of cold water storage cistern 9, so that the water temperature that thermal source part flows out reaches the temperature set.
As it is shown on figure 3, outer shroud 2 is connected fixing by two semicircular ring by the bolt hole 8 on rib 7.
Adopt and use water as the crack-resistant performance of concrete method of testing that the constraint degree of thermal source is variable, comprise the following steps:
The first step: internal ring, outer shroud are fixed on base plate, the outlet of thermal source is connected with annular water tank water inlet, the outlet of annular water tank is connected with water pump.
Second step: by concreting between outer shroud and internal ring, sets the water temperature of temprature control unit, starts water pump simultaneously.
3rd step: remove outer shroud after concrete initial set, now the internal ring of ring part heats up expansion under hot water effect, add the constraint degree of annulus, simultaneously with hydration and the dry shrinkage of concrete cement in condensing hardening process, considerably increase the tension on concrete ring so that concrete can rapid crack propagation.Record and compare different concrete cracking time and i.e. draw the cracking resistance of different concrete.
Claims (8)
1. the crack-resistant performance of concrete test device that a constraint degree is variable, including the concrete mould with internal ring and outer shroud, the annulus chamber of concrete is formed between described internal ring and outer shroud, it is characterized in that: also include a constraint controller, this constraint controller includes thermal source and makes described internal ring expanded by heating by the heating of described thermal source and act on the temperature control heating chamber of concrete inner surface, and this temperature controls heating chamber and is positioned at described internal ring.
The crack-resistant performance of concrete test device that a kind of constraint degree is variable, it is characterized in that: described thermal source is boiler and cold water storage cistern, it is annular water tank that described temperature controls heating chamber, described annular water tank is provided with water inlet and outlet, described boiler and cold water storage cistern are connected in parallel on the water inlet of described annular water tank and the outlet of annular water tank, are provided with an electromagnetic valve intaking water temperature in regulating described annular water tank at the described outlet stating boiler and cold water storage cistern.
The crack-resistant performance of concrete test device that a kind of constraint degree is variable, it is characterised in that: on the outlet of described annular water tank, it is additionally provided with a water pump.
4. according to the crack-resistant performance of concrete test device that constraint degree a kind of described in Claims 2 or 3 is variable, it is characterised in that: in described boiler, it is provided with heater.
The crack-resistant performance of concrete test device that a kind of constraint degree is variable, it is characterised in that: described thermal source is high-temperature gas, and it is that annular gas is distributed case that described temperature controls heating chamber.
The crack-resistant performance of concrete test device that a kind of constraint degree is variable, it is characterised in that: described thermal source is heater, and it is annular heat distribution case that described temperature controls heating chamber, and described heater is positioned at this annular heat distribution case.
7. according to the crack-resistant performance of concrete test device that a kind of constraint degree described in claim 1,2,5 or 6 is variable, it is characterized in that: described outer shroud is made up of two semicircular ring, the edge of semicircular ring is provided with rib, and two semicircular ring are by the detachable connection of described rib.
8. the crack-resistant performance of concrete method of testing that a constraint degree is variable, it is characterised in that: step is as follows:
The first step: install the concrete mould with internal ring and outer shroud, and casting concrete annulus between the internal ring and outer shroud of concrete mould；
Second step: remove outer shroud after concrete annulus initial set, by increasing the constraint degree of concrete annulus by the way of heating internal ring makes internal ring expanded by heating in internal ring, accelerates concrete circular ring opening；
3rd step, record and cracking resistance that relatively different concrete cracking time i.e. draw different concrete.
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