CN105806769B - FRP arrangement of reinforcement seawater sea-sand concrete member accelerated corrosion experimental rig and method - Google Patents
FRP arrangement of reinforcement seawater sea-sand concrete member accelerated corrosion experimental rig and method Download PDFInfo
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Abstract
The invention discloses a kind of FRP arrangement of reinforcement seawater sea-sand concrete member accelerated corrosion experimental rigs, including tide environmental simulation system, loading system and FRP tendons anchoring mechanism；Tide environmental simulation system includes two ponds, is equipped with two water pumps between pond, the water outlet in a pond is connected to the water inlet in another pond respectively, heating rod is also set up in each pond, makes unrestrained pump by each water pump；Loading system includes one group of seat post in pond, FRP arrangement of reinforcement marine sand concrete beam is provided in seat post, support lever is distinguished by multiple uniformly distributed buttresses above FRP arrangement of reinforcement marine sand concrete beam, each lever one end with to be anchored at the FRP tendons in pond by FRP tendons anchoring mechanism hinged, the other end connects load.The present invention realizes simulation to wave in soaking process, realizes the simulation to sea wind in the drying process, and integrated level is high, practical, can effectively be tested long-term behaviour of the FRP arrangement of reinforcement marine sand concrete beam after load/drying and watering cycle accelerated corrosion.
Description
Technical field
The present invention relates to the mechanical property test technical field of building component, specifically a kind of FRP arrangement of reinforcement seawater sea sand is mixed
Solidifying soil component accelerated corrosion experimental rig and method.
Background technique
FRP tendons become the ideal material that reinforcing bar is substituted under corrosive environment due to its excellent corrosion resistance.But due to
FRP material is shorter for civil engineering history, and the inspection achievement of durability in practical projects is rare, grinds to its endurance quality
Studying carefully is particularly important.The existing accelerated corrosion for FRP tendons is tested, and the environmental factor of consideration is single, especially lacks additional answer
The coupling of power, reality in, always have external load in engineering structure.Therefore, the durability test of FRP reinforcement structure is being carried out
When the influence of external load must be taken into consideration.
The drying and watering cycle effect of littoral area seawater generates great corrosiveness to coastal infrastructure, caused by lose ten
Divide serious.Reinforcing bar accelerating corrosion caused by chloride permeability is the main reason of concrete structure failure, for a long time, research
A large amount of research, including addition corrosion inhibitor, galvanizing steel, cathodic protection have been carried out in the anticorrosion that person is directed to reinforcing bar under marine environment
Deng, but cannot perfectly solve steel bars corrosion problem.With the development of national Maritime Silk Road strategy, ocean dry and wet is studied
Recycling environment flowering structure object corrosion degradation rule becomes a hot spot.
Reinforcing bar in order to prevent in concrete is premature to be corroded, and various countries standardize containing for the chloride ion in concrete
Amount have stringent limitation, this sea sand for making salt content high forbid in many occasions using.But works as and use FRP tendons as inside
When enhancing muscle, the use of sea sand will be unrestricted.Therefore, FRP tendons enhancing marine sand concrete structure is a kind of promising
New structure combining form.Currently, there is a serious shortage of experimental study the type structure is under ocean tide environment for correlative study
Long-term behaviour has a very important significance.
Manual handling test specimen can be used in current wetting-drying test, or complete using automatic equipments such as drying and watering cycle casees
At.Manually repeatedly portage when, it is laborious, and for large-scale beam, the column component in civil engineering, manual handling is difficult to carry out.It is dry
Wet cyclic test case is generally used for the corrosion test of civil engineering materials field, and test specimen number is more and size is small.For large size
Beam, column component, drying and watering cycle case can not accommodate, the bigger chamber of custom-made, at high price, the sample dimensions being met by
It is still limited.Moreover, existing apparatus is unable to satisfy couples application to beam, the column component in civil engineering while drying and watering cycle
The test demand of load.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, it is mixed that the present invention provides a kind of FRP arrangement of reinforcement seawater sea sand
Solidifying soil component accelerated corrosion experimental rig and method.
Technical solution: in order to solve the above technical problems, a kind of FRP arrangement of reinforcement seawater sea-sand concrete member of the invention accelerates
Corrosion testing apparatus, including tide environmental simulation system, loading system and FRP tendons anchoring mechanism；Tide environmental simulation system packet
Two ponds are included, two water pumps are equipped between pond, each water pump is respectively by the water outlet in a pond and another pond
Water inlet is connected to, and is also set up heating rod in each pond, is made unrestrained pump；Loading system includes one group of seat post in pond,
It is provided with FRP arrangement of reinforcement seawater marine sand concrete beam in seat post, passes through above FRP arrangement of reinforcement seawater marine sand concrete beam multiple uniformly distributed
Buttress distinguish support lever, each lever one end with to be anchored at the FRP tendons in pond by FRP tendons anchoring mechanism hinged, separately
One end connects load.
Further, lever one end be anchored at that the FRP tendons in pond are hinged, and the other end passes through by FRP tendons anchoring mechanism
Articulated joint and another lever middle join, another lever one end and are anchored in pond by FRP tendons anchoring mechanism
FRP tendons it is hinged, the other end connect load.
Further, FRP tendons anchoring mechanism includes the anchor slab with holes set on basin bottom, and FRP tendons one end passes through the anchor with holes
It is fastened after plate by nut, the other end is fastened after passing through lever end by nut.
Further, heat-preserving cover plate is equipped with above each pond, heat-preserving cover plate is equipped with fan and air outlet, when fan connects
Control switch.
Further, multiple displacement meters are evenly equipped on each FRP arrangement of reinforcement marine sand concrete beam.
Further, the bottom in each pond is tilted to water outlet, and inclined angle is 5 °~8 °.
Further, water level controller is equipped in each pond, water level controller, heating rod, makes wave pump connection time control at water pump
Switch.
Further, four wall of pond and bottom plate are formed by concreting, and insulating layer is arranged in sandwich in concrete.
A kind of FRP arrangement of reinforcement seawater sea-sand concrete member accelerated corrosion test method, comprising the following steps:
(1) FRP arrangement of reinforcement seawater marine sand concrete beam is poured, FRP tendons tensile test specimen is made and is anchored；
(2) FRP arrangement of reinforcement seawater marine sand concrete beam is set up into the FRP tendons tensile test specimen one that into pond, will have been anchored respectively
In the end insertion pre-buried anchor slab with holes in pond, and screw cap anchoring is screwed on after basin bottom, cover pond heat-preserving cover plate；
(3) buttress is placed in the loading position of FRP arrangement of reinforcement seawater marine sand concrete beam, lever is set up on buttress, by FRP
The other end of muscle tensile test specimen passes through the hole reserved on lever, and is tightened with nut；
(4) counterweight is added step by step, while adjusting the nut of FRP tendons tensile test specimen upper end, keeps lever using level meter
Level, until predetermined load level reaches；
(5) it sets up displacement meter, and the artificial seawater of 5% sodium chloride content is perfused to designated position to one of pond,
Test specimen is flooded in guarantee；
(6) according to the drying and watering cycle system of setting, the opening and closing time of time switch is set；Power on, according to
The age of setting starts the corrosion of automatic dry-wet cyclical acceleration；
(7) it is inspected periodically during test, and by tightening nuts, keeps lever horizontal, be spaced to schedule, survey
Spend displacement meter reading；
(8) after reaching the age of setting, stop test, take out FRP arrangement of reinforcement marine sand concrete beam and drawn with anchorage FRP tendons
Test specimen is stretched, the test of mechanical property after load/drying and watering cycle accelerated corrosion is carried out.
The utility model has the advantages that a kind of FRP arrangement of reinforcement seawater sea-sand concrete member accelerated corrosion experimental rig of the invention, is impregnating
The simulation to wave to be realized in the process, realizes the simulation to sea wind in the drying process, integrated level is high, and it is practical, it can facilitate
Realize the automatic dry-wet synergistic accelerated corrosion test of civil engineering beam, column scantling test specimen, and to beam, column, tensional element
Coupling applies stress while drying and watering cycle, so that durability test solves existing dry and wet and follow closer to true service state
Ring apparatus is unable to satisfy durability test of the civil engineering large-scale component under ocean tide environment, can not provide effective external load
The deficiency of coupling.Method of the invention can accelerate FRP arrangement of reinforcement seawater marine sand concrete beam through load/drying and watering cycle
Long-term behaviour after corrosion is effectively tested, to provide effectively support to the engineer application of the new structure.
Detailed description of the invention
Fig. 1 is the longitudinal profile structure schematic of experimental rig of the present invention；
Fig. 2 is lateral schematic cross-sectional view of the invention；
Fig. 3 is circuit diagram of the invention；
Fig. 4 is the structural schematic diagram that FRP tendons bond concrete in Fig. 2；
Fig. 5 is FRP tendons anchoring mechanism structural schematic diagram；
Fig. 6 is articulated joint structural schematic diagram.
Specific embodiment
The present invention will be further explained with reference to the accompanying drawing.
A kind of FRP arrangement of reinforcement seawater sea-sand concrete member accelerated corrosion experimental rig as shown in Figure 1 and Figure 2, including tide
Environmental simulation system, loading system and FRP tendons anchoring mechanism；Tide environmental simulation system include two ponds 13, pond 13 it
Between be provided with two water pumps 26,27, each water pump is respectively by the water inlet 17 of the water outlet 16 in a pond and another pond
It is connected to, heating rod 21,23 is also set up in each pond 13, makes wave pump 22,24；Heat-preserving cover plate is provided with above each pond 13
15, fan 20,25 and air outlet 19 are provided on heat-preserving cover plate 15, fan 20,25 connects time switch, and loading system includes setting
One group of seat post 10 in pond is set, is set up between seat post 10 and is equipped with FRP arrangement of reinforcement seawater marine sand concrete beam 9, FRP arrangement of reinforcement
Distinguish support levers 11 by multiple uniformly distributed buttresses 8 above seawater marine sand concrete beam 9, each 11 one end of lever with pass through
FRP tendons anchoring mechanism is anchored at the FRP tendons 12 in pond hingedly, and the other end connects load 1.FRP tendons anchoring mechanism includes setting
In the anchor slab with holes 6 of basin bottom, 12 one end of FRP tendons is fastened after passing through the anchor slab 6 with holes by nut, and the other end passes through lever
It is fastened behind 11 ends by nut.Multiple displacement meters 18, Ge Geshui are evenly equipped on each FRP arrangement of reinforcement seawater marine sand concrete beam 9
The bottom in pond 13 is tilted to water outlet 16, and inclined angle is 5 °~8 °, is provided with water level controller 31 in each pond 13,
32, water level controller 31,32, heating rod 21,23, makes 22,24 connection time switch of wave pump at water pump 26,27.11 one end of lever with
It is hinged to be anchored at the FRP tendons 12 in pond by FRP tendons anchoring mechanism, the other end can also be by articulated joint 3 with it is another
Join in the middle part of a lever 2, which is anchored at the FRP tendons 5 in pond hingedly with by FRP tendons anchoring mechanism,
The other end connects load 1.13 4 wall of pond and bottom plate are formed by concreting, and insulating layer is arranged in sandwich in concrete.And it covers
Plate 15 can be the bamboo board of inner clip insulating layer, and inlet and outlet 19 is reserved on cover board 15 and is passed through for FRP tendons 5,12, displacement meter 18
Hole.Water pump 26,27 can be magnetic water pump, be also possible to the water pump of other seawater corrosion resistances, such as stainless steel pump.
As shown in Figure 3, heating rod 21, make wave pump 22, time switch 29, fan 20 are connected with power supply 28, heating rod 23,
It makes wave pump 24, time switch 34, fan 25 to connect with power supply 28, time switch 30, water level controller 31, water pump 26 and power supply 28
Series connection, time switch 33, water level controller 32, water pump 27 are connected with power supply 28.
By taking practical twice a day fluctuation tide as an example, 00:00 moment left pond high water level submerges test specimen, and right pond low water level is dry
Dry test specimen.At this point, the upper control water-level probe of left pond water level controller probe floods, water level controller 31 is on-state.If
Fixed, 00:00 moment, time switch 30 is connected, and water pump 26 works, and seawater is evacuated to right pond from left pond.When left tank water potential drop
When control water level lower down to left water level in water pool control probe, water level controller 31 is disconnected, and water pump 26 stops pumping.Record institute's used time
Between, such as 20 minutes.In next step, 00:30 moment, time switch 34 are connected, and heating rod 23 makes wave pump 24, the beginning work of fan 25
Make, test specimen is by sea wind desiccation in the pond of the left side, coupling of the test specimen by high temperature seawater and wave in the pond of the right.5:30
Moment, time switch 34 disconnect, heating rod 23, make wave pump 24, fan 25 stops working.6:00 moment, time switch 33 are connected,
At this point, level control switch for water 32 is on-state, water pump 27 works, and seawater is evacuated to left side pond from the right pond.When right pond
When water level is reduced to control water level under probe for controlling level, level control switch for water 32 is disconnected, and water pump 27 stops pumping.The 6:30 moment,
Time switch 29 is connected, and heating rod 21 makes wave pump 22, the start-up operation of fan 25, and test specimen is by high temperature seawater and sea in the pond of the left side
The coupling of wave, test specimen is by sea wind desiccation in the pond of the right.11:30 moment, time switch 29) it disconnects, heating rod 21,
Make wave pump 22, fan 25 stops working.12:00 moment, time switch 30 are connected, and water pump 26 works.
In above-mentioned 12 hours, the test specimen in the pond of left and right respectively all experienced a drying and watering cycle.Later, the above mistake is repeated
Journey.Table 1 is that each time switch switches on and off time point.
Each time switch of table 1 switches on and off time point
| Movement | Time switch 30 | Time switch 34 | Time switch 32 | Time switch 29 |
| It connects | 00:00 | 00:30 | 06:00 | 06:30 |
| It disconnects | 00:30 | 05:30 | 06:30 | 11:30 |
| It connects | 12:00 | 12:30 | 18:00 | 18:30 |
| It disconnects | 12:30 | 17:30 | 18:30 | 23:30 |
For other drying and watering cycle systems, those skilled in the art can refer to above example, connect to time switch
Switching ETAD expected time of arrival and departure is set.
The present invention also provides a kind of FRP arrangement of reinforcement seawater sea-sand concrete member accelerated corrosion test method, specific implementations
Steps are as follows:
(1) FRP arrangement of reinforcement seawater marine sand concrete beam is poured, 5,12 tensile test specimen of FRP tendons is made using screw thread anchorage.
Pouring and conserving for FRP arrangement of reinforcement seawater marine sand concrete test beam is completed in laboratory.FRP tendons 5,12 are inserted into
In screw thread anchorage, the build-in glue that perfusion prepares in anchorage anchors FRP tendons 5,12.Wherein FRP tendons 5,12 test sections can also be held
It is wrapped with seawater marine sand concrete.
(2) two FRP arrangement of reinforcement seawater marine sand concrete test beams are set up respectively into two ponds, the FRP that will have been anchored
5,12 tensile test specimen one end of muscle is inserted into the pre-buried anchor slab 6 with holes in pond, and screws on nut；
(3) heat-preserving cover plate boxed out by predetermined position is covered；
(4) load application system is set up.Firstly, the loading position in test beam places buttress 8, flexural pivot is placed on buttress
7.Later, I-steel lever 2,11 is set up, the other end of 5,12 tensile test specimen of FRP tendons is passed through into the hole that I-steel is reserved, is used in combination
Nut is screwed in I-steel top flange.
(5) counterweight is added step by step, while turning the nut of two FRP tendons, 5,12 tensile test specimen upper end using spanner, is utilized
Level meter keeps I-steel holding horizontal, until predetermined load level reaches.
(6) it sets up displacement meter, and the artificial seawater of 5% sodium chloride content is perfused to designated position to one of pond,
Test specimen is flooded in guarantee.
(7) according to the drying and watering cycle system of setting, the opening and closing time of time switch is set.Power on, according to
The age of setting starts the corrosion of automatic dry-wet cyclical acceleration；
(8) it is inspected periodically during test, and by tightening nuts, keeps I-steel horizontal.It is spaced to schedule,
Estimate displacement meter reading；
(9) after reaching the age of setting, stop test, take out test beam and with 5,12 tensile test specimen of anchorage FRP tendons, into
The test of mechanical property after row load/drying and watering cycle accelerated corrosion.
The above is only a preferred embodiment of the present invention, it should be pointed out that: for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (8)
1. a kind of FRP arrangement of reinforcement seawater sea-sand concrete member accelerated corrosion experimental rig, it is characterised in that: including tide environment mould
Quasi- system, loading system and FRP tendons anchoring mechanism；Tide environmental simulation system includes two ponds, is equipped with two between pond
The water outlet in one pond is connected to the water inlet in another pond respectively, also sets up in each pond by water pump, each water pump
Heating rod makes unrestrained pump；Loading system includes one group of seat post in pond, and it is mixed that FRP arrangement of reinforcement sea sand is provided in seat post
Solidifying Tu Liang, by multiple uniformly distributed buttresses difference support levers above FRP arrangement of reinforcement marine sand concrete beam, lever one end with pass through
It is hinged that FRP tendons anchoring mechanism is anchored at the FRP tendons in pond, and the other end is joined by articulated joint and another lever middle,
Another lever one end with to be anchored at the FRP tendons in pond by FRP tendons anchoring mechanism hinged, the other end connects load.
2. FRP arrangement of reinforcement seawater sea-sand concrete member accelerated corrosion experimental rig according to claim 1, feature exist
In: FRP tendons anchoring mechanism includes the anchor slab with holes set on basin bottom, and FRP tendons one end passes through nut after passing through the anchor slab with holes
Fastening, the other end are fastened after passing through lever end by nut.
3. FRP arrangement of reinforcement seawater sea-sand concrete member accelerated corrosion experimental rig according to claim 1, feature exist
In: heat-preserving cover plate is equipped with above each pond, heat-preserving cover plate is equipped with fan and air outlet, and fan connects time switch.
4. FRP arrangement of reinforcement seawater sea-sand concrete member accelerated corrosion experimental rig according to claim 1, feature exist
In: multiple displacement meters are evenly equipped on each FRP arrangement of reinforcement marine sand concrete beam.
5. FRP arrangement of reinforcement seawater sea-sand concrete member accelerated corrosion experimental rig according to claim 1, feature exist
In: the bottom in each pond is tilted to water outlet, and inclined angle is 5 °~8 °.
6. FRP arrangement of reinforcement seawater sea-sand concrete member accelerated corrosion experimental rig according to claim 1, feature exist
In: water level controller is equipped in each pond, water level controller, heating rod, makes wave pump connection time switch at water pump.
7. FRP arrangement of reinforcement seawater sea-sand concrete member accelerated corrosion experimental rig according to claim 1, feature exist
It is formed in: four wall of pond and bottom plate by concreting, insulating layer is arranged in sandwich in concrete.
8. a kind of FRP arrangement of reinforcement seawater sea-sand concrete member accelerated corrosion test method, it is characterised in that: the following steps are included:
(1) FRP arrangement of reinforcement seawater marine sand concrete beam is poured, FRP tendons tensile test specimen is made and is anchored；
(2) FRP arrangement of reinforcement seawater marine sand concrete beam is set up respectively in the seat post in pond, the FRP tendons anchored is drawn
It stretches in test specimen one end insertion pre-buried anchor slab with holes in pond, and screws on screw cap anchoring after basin bottom, cover pond heat-preserving cover plate；
(3) buttress is placed in the loading position of FRP arrangement of reinforcement seawater marine sand concrete beam, lever is set up on buttress, FRP tendons are drawn
The other end for stretching test specimen passes through the hole reserved on lever, and is tightened with nut；
(4) counterweight is added step by step, while adjusting the nut of FRP tendons tensile test specimen upper end, keeps lever holding horizontal using level meter,
Until predetermined load level reaches；
(5) displacement meter is set up, and the artificial seawater of 5% sodium chloride content of one of pond perfusion is guaranteed to designated position
Flood test specimen；
(6) according to the drying and watering cycle system of setting, the opening and closing time of time switch is set；Power on, according to setting
Age, start automatic dry-wet cyclical acceleration corrosion；
(7) it is inspected periodically during test, and by tightening nuts, keeps lever horizontal, be spaced to schedule, estimate position
Move meter reading；
(8) after reaching the age of setting, stop test, take out FRP arrangement of reinforcement seawater marine sand concrete beam and the FRP tendons with anchorage
Tensile test specimen carries out the test of mechanical property after load/drying and watering cycle accelerated corrosion.
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