CN103266772B - Curing method used for highway engineering construction concrete in winter - Google Patents
Curing method used for highway engineering construction concrete in winter Download PDFInfo
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- CN103266772B CN103266772B CN201310185404.8A CN201310185404A CN103266772B CN 103266772 B CN103266772 B CN 103266772B CN 201310185404 A CN201310185404 A CN 201310185404A CN 103266772 B CN103266772 B CN 103266772B
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Abstract
The invention discloses a curing method used for highway engineering construction concrete in winter. The curing method comprises arranging a pressure boiler and a box girder precast pedestal; arranging a main pipe line which is communicated with the pressure boiler on the bilateral sides of the box girder precast pedestal; binding box girder rebar and installing a box girder formwork; pre-embedding thermometer holes and pouring concrete; arranging a curing shed moving support; installing a branch pipe line and a fog steam nozzle; covering a canvas insulation layer on the curing shed moving support; and performing still-stand period, temperature-rise period, constant temperature period and temperature-fall period curing. According to the curing method used for the highway engineering construction concrete in winter, water vapor is formed into fog to cure the concrete under no pressure or small pressure and the fog steam temperature is controlled at about 30 DEG C to enable the strength of cement concrete to be improved under the condition of constant temperature and humidity to be beneficial to the formation of hydration products that crystallization is complete and crystal materials are uniform, so that the temperature difference of the concrete surface and the environment caused by the removal of the insulation layer is redued, concrete cracks can be prevented, and the later strength and durability of components are guaranteed.
Description
Technical field
The present invention relates to a kind of concrete maintenance process, specifically, relate to a kind of for the concrete maintenance process of highway engineering construction in winter, belong to Construction Technology field.
Background technology
The concrete teletostage maintenance of Current Highway engineering mainly contains regenerative process, steam heating and construction " heating house method ".Wherein regenerative process: be applicable to below ground engineering or structure is not suitable for more than ground concrete maintenance.Steam heating: when adopting Portland cement, curing temperature is no more than 80 DEG C; When adopting portland slag cement, curing temperature can reach 85 DEG C.Construction " heating house method ": require that temperature of shed is not less than 5 DEG C, and should keep certain humidity, should have the safety prevention measure of anti-gas poisoning of preventing fires.
Require in existing " highway bridge and culvert construction technique normalizing " (JTG/T F50-2011) that the curing temperature scope of steam heating is no more than 80 DEG C (85 DEG C), do not provide optimum temperature-controlled zones, usually temperature is controlled at 70-80 DEG C in practice of construction, hydrated cementitious is very fast, early age strength of concrete is high, but because the growth of hydrated product crystalline substance material is fast, crystallization is thick, later strength is often caused to rise slowly, also the durability of works is had influence on, after maintenance insulation layer and template are removed in succession, surface temperature of concrete differs larger with environment temperature like this, higher to the requirement of removing rear concrete surface covering and heat insulating, easily there is crack in concrete surface, still need to carry out covering and heat insulating to concrete surface, need to continue to adopt in construction " heating house method " construction often to use briquet stove heating, carbon dioxide content in brooder will be caused to raise, cause the early stage carbonization of concrete, concrete structure durability is had a negative impact.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned Problems existing, there is provided a kind of for the concrete maintenance process of highway engineering construction in winter, very little on late strength of concrete impact, avoid High-temperature Curing and terminate thermal cracking that rear concrete component internal-external temperature difference causes and shrinkage crack.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is: a kind of for the concrete maintenance process of highway engineering construction in winter, it is characterized in that: described maintenance process comprises the following steps:
Arrange pressure boiler and prefabricated box-beam pedestal at precasting yard, lay main pipeline in the both sides of prefabricated box-beam pedestal, main pipeline is communicated with pressure boiler;
Colligation case beam steel, install bin beam forms;
Pre-buried thermometer hole, concreting: the metal sleeve of pre-buried length 10 ~ 15cm on reinforcing bar, time pre-buried, colligation is on the reinforcing bar of beam slab, is put in each 1 place of 0L, 1/4L, 1/2L, 3/4L, L place of beam body web, base plate, top board, and be numbered in order, concreting;
Arrange shed traversing carriage: after concreting, shed support is set around beam body, highly exceeds the end face 10 ± 2cm of beam body, length 20 ± 2cm larger than the length of beam body, width 10 ± 2cm larger than the widest part of beam body;
Branch pipe(tube) and mist vapour nozzle are installed: several branch pipe(tube)s are straight up set on main pipeline, spacing≤4 meter of adjacent branch pipe(tube), the end of branch pipe(tube) is provided with mist vapour nozzle, the Way out of mist vapour nozzle becomes miter angle obliquely, distance between the outer wall of mist vapour nozzle and beam body is 1 ± 0.1 meter, and main pipeline thermal insulation material wraps up;
Shed support covers canvas insulation layer, and canvas lower edge compresses;
Pressure boiler conveying mist vapour carries out health step, and health step comprises quietly puts stage, temperature rise period, constant temperature stage and temperature-fall period:
Describedly quietly put the stage: the quiet time of putting of wet concrete is 2 ~ 4 hours; The quiet time of putting of harsh concrete is 1 hour; The concrete in static time of putting being mixed with retarding additive is 4 ~ 6 hours;
The described temperature rise period: conveying mist vapour heats up, and beam surface programming rate controls within 10 DEG C/h, and the heating up time is 2 ~ 3 hours;
In the described constant temperature stage: prestressed concrete health temperature remains on 30 DEG C, treat that concrete crushing strength reaches 100% of design strength, enter temperature-fall period;
Described temperature-fall period: cooling rate is not more than 5 DEG C/h, controls health temperature by Valve controlling water vapour spray volume;
Remove insulation layer, concrete strength reach design strength 100% and curing age remove when reaching seven days, remove shed support.
The present invention adopts above technical scheme, compared with prior art, there is following effect: traditional steam curing is changed into the health of mist vapour, by pipeline to concreting ground, without under pressure or very little pressure, steam is nebulized health concrete, reduce the temperature of steam, mist stripping temperature controls at about 30 DEG C, test specimen entity proper temperature, decrease the crackle and liter that occur because concrete local temperature is too high, lower the temperature too fast, make cement concrete at constant temperature, intensity is increased under humidity constant state, be conducive to forming perfect crystalline, the uniform hydrated product of brilliant material, and the concrete surface brought after reducing dismounting insulation layer and ambient temperature differences, can prevent concrete from occurring crack, and be conducive to forming perfect crystalline, the uniform hydrated product of brilliant material, ensure that later strength and the durability of component.
Meanwhile, whole health process does not introduce carbon dioxide, reduces carbonation of concrete degree, decreases the discharge of pollutant.
Below in conjunction with drawings and Examples, the present invention is described in further detail.
Accompanying drawing explanation
Accompanying drawing 1 is the apparatus structure schematic diagram of maintenance process in the embodiment of the present invention;
Accompanying drawing 2 be in accompanying drawing 1 A-A to structural representation;
In figure,
1-pressure boiler, 2-prefabricated box-beam pedestal, 3-main pipeline, 4-mist vapour conveyance conduit, 5-shed support, 6-beam body, 7-branch pipe(tube), 8-mist vapour nozzle.
Detailed description of the invention
Embodiment, a kind of for the concrete maintenance process of highway engineering construction in winter, for prefabricated case beam health, comprise the following steps:
The first step: set up pressure boiler 1 at precasting yard, i.e. steam heating boiler, lay main pipeline 3 in the both sides of prefabricated box-beam pedestal 2, main pipeline 3 is communicated with pressure boiler 1 by mist vapour conveyance conduit 4, and main pipeline 3 adopts the pvc pipe of 5cm;
Second step: colligation case beam steel, install bin beam forms;
Second step: pre-buried thermometer hole metal sleeve, concreting: the metal sleeve of pre-buried internal diameter 12mm, long 10 ~ 15cm on reinforcing bar, time pre-buried, colligation is on the reinforcing bar of beam slab, be put in each 1 place of 0L, 1/4L, 1/2L, 3/4L, L place of beam body 6 web, base plate, top board, and be numbered in order, concreting;
3rd step: arrange shed traversing carriage: after concreting, shed support 5 is set around beam body 6, shed support 5 adopts φ 20 reinforcement welding to form, highly exceed the end face 10 ± 2cm of beam body 6, length 20 ± 2cm larger than the length of beam body 6, width 10 ± 2cm larger than the widest part of beam body 6;
4th step: install branch pipe(tube) and mist vapour nozzle: be provided with branch pipe(tube) 7 straight up on main pipeline 3, branch pipe(tube) 7 adopts the pvc pipe of 2cm, spacing≤4 meter of adjacent branch pipe(tube) 7, the end of branch pipe(tube) 7 is provided with mist vapour nozzle 8, the Way out of mist vapour nozzle 8 becomes miter angle obliquely, distance between mist vapour nozzle 8 and the outer wall of beam body 6 is 1 ± 0.1 meter, and to prevent mist vapour from directly blowing on concrete, main pipeline 3, mist vapour conveyance conduit 4 wrap up with thermal insulation material;
5th step: cover canvas insulation layer on shed support 5, canvas lower edge steel pipe, reinforcing bar compress, and prevent ventilative;
6th step: pressure boiler 1, namely steam heating boiler conveying mist vapour carries out health step;
Health step divides four-stage, quietly puts the stage: wet concrete is 2 ~ 4 hours; Harsh concrete is 1 hour, the concrete being mixed with retarding additive is 4 ~ 6 hours, quiet temperature of putting should not lower than 10 DEG C, this one-phase mainly makes cement in concrete have a more abundant hydration time, concrete forms some strength, with the resistance of Concrete Structure to temperature rise period Structural Disintegration, avoid occurring crack and loose phenomenon in component surface during the maintenance of mist vapour.This is very important for the swelling of elimination concrete in intensification;
Temperature rise period: conveying mist vapour heats up, and beam surface programming rate controls within 10 DEG C/h, and the heating up time is 2 ~ 3 hours, this one-phase, hydrated reaction of cement is accelerated, and forms some strength gradually, and concrete generation heat expansion is out of shape, and inside and outside the temperature difference can produce thermal stresses;
In the constant temperature stage: prestressed concrete health temperature remains on 30 DEG C, treat that concrete strength reaches 100%, after can lower the temperature, under identical curing condition, the intensity of concrete test block is concrete strength;
Temperature-fall period: cooling rate is not more than 5 DEG C/h, controls health temperature by Valve controlling water vapour spray volume, with prevent concrete surface and internal difference in temperature excessive and produce crack, and fill in mist vapour health record;
Control the concrete temperature 10 DEG C-30 DEG C in 7d after building, heating-cooling speed measurement per hour temperature, thermometer stops and is not less than 3 minutes in pipe, then takes out and writes down temperature.To component, namely within during the health of case beam constant temperature every 2 hours, carry out a temperature survey and record, set up health temperature and detect account.By test room, compressive strength inspection is carried out to test block, reach 100% design strength rear and allow to lower the temperature.
7th step: concrete strength reach design strength 100% and curing age when reaching seven days, remove insulation layer, remove shed support 5.
Health effect:
Intensity rebound test is carried out by concrete structure low temperature micro-carbon mist vapour method being carried out to health in winter, result is all qualified in and even, surperficial any crack, low temperature micro-carbon mist vapour regimen controls mist stripping temperature at about 30 DEG C, test specimen entity proper temperature, avoid the too high easy generation fine cracks of vapor (steam) temperature and the too fast phenomenon of heating-cooling occurs, cement concrete is made to increase intensity under constant temperature, humidity constant state, be conducive to forming perfect crystalline, the uniform hydrated product of brilliant material, ensure that later strength and the durability of component.
Test:
In the speed construction of blue or green Lingao, for analyzing the health of low temperature micro-carbon mist vapour to the impact of concrete strength, the feasibility of checking low temperature micro-carbon mist vapour health, carry out following contrast test according to maintenance process of the present invention:
Getting C30 precast plate concrete mix, to carry out test block prefabricated, under being positioned over 75 DEG C of steam curing conditions and 30 DEG C of mist vapour health-preserving conditions respectively, carry out concrete strength compression test the length of time to 3d, 5d, 7d, 14d, 28d respectively, under different condition, concrete crushing strength (MPa) comparing result is as following table:
| Health-preserving condition/length of time | 3d | 5d | 7d | 14d | 28d |
| 75 DEG C of steam curings | 28.2 | 31.8 | 33.2 | 37.2 | 41.6 |
| The health of 30 DEG C of mist vapour | 21.5 | 26.2 | 28.4 | 35.2 | 41.2 |
Experimental data illustrates, 75 DEG C of steam curings, due to higher temperature, improve the hydration rate of concrete cement, and concrete hydration reaction is comparatively fast corresponding, and early age strength of concrete promotes very fast, but later strength increasess slowly; Under 30 DEG C of mist vapour health-preserving conditions, concrete test block intensity increases relatively slow in early days, and later stage concrete strength is substantially identical with under 75 DEG C of steam curing conditions.
Low temperature (30 DEG C) health is very little on late strength of concrete impact, helps avoid High-temperature Curing simultaneously and terminates thermal cracking that rear concrete component internal-external temperature difference causes and shrinkage crack, contribute to alleviating the early stage carbonization of concrete easily occurred in general health.
The micro-carbon health-preserving method of low temperature mist vapour that this health-preserving method is discussed is equally applicable to the health of the position winter construction such as cast-in-situ box girder, precast hollow slab, bent cap and pier stud.
Those skilled in the art will recognize that; above-mentioned detailed description of the invention is exemplary; to enable those skilled in the art better understand content of the present invention; should not be understood as limiting the scope of the invention; as long as according to the improvement that technical solution of the present invention is done, all fall into protection scope of the present invention.
Claims (1)
1. for the concrete maintenance process of highway engineering construction in winter, it is characterized in that: described maintenance process comprises the following steps:
The first step: set up pressure boiler (1) at precasting yard, i.e. steam heating boiler, lay main pipeline (3) in the both sides of prefabricated box-beam pedestal (2), main pipeline (3) is communicated with pressure boiler (1) by mist vapour conveyance conduit (4), and main pipeline (3) adopts the pvc pipe of 5cm;
Second step: colligation case beam steel, install bin beam forms;
Second step: pre-buried thermometer hole metal sleeve, concreting: the metal sleeve of pre-buried internal diameter 12mm, long 10 ~ 15cm on reinforcing bar, time pre-buried, colligation is on the reinforcing bar of beam slab, be put in each 1 place of 0L, 1/4L, 1/2L, 3/4L, L place of beam body (6) web, base plate, top board, and be numbered in order, concreting;
3rd step: arrange shed traversing carriage: after concreting, shed support (5) is set around beam body (6), shed support (5) adopts φ 20 reinforcement welding to form, highly exceed the end face 10 ± 2cm of beam body (6), length 20 ± 2cm larger than the length of beam body (6), width 10 ± 2cm larger than the widest part of beam body (6);
4th step: install branch pipe(tube) and mist vapour nozzle: be provided with branch pipe(tube) (7) straight up on main pipeline (3), branch pipe(tube) (7) adopts the pvc pipe of 2cm, spacing≤4 meter of adjacent branch pipe(tube) (7), the end of branch pipe(tube) (7) is provided with mist vapour nozzle (8), the Way out of mist vapour nozzle (8) becomes miter angle obliquely, distance between the outer wall of mist vapour nozzle (8) and beam body (6) is 1 ± 0.1 meter, to prevent mist vapour from directly blowing on concrete, main pipeline (3), mist vapour conveyance conduit (4) wrap up with thermal insulation material;
5th step: at shed support (5) upper covering canvas insulation layer, canvas lower edge steel pipe, reinforcing bar compress, and prevent ventilative;
6th step: pressure boiler (1) conveying mist vapour carries out health step;
Health step divides four-stage, quietly puts the stage: wet concrete is 2 ~ 4 hours; Harsh concrete is 1 hour, the concrete being mixed with retarding additive is 4 ~ 6 hours, quiet temperature of putting should not lower than 10 DEG C, this one-phase mainly makes cement in concrete have a more abundant hydration time, concrete forms some strength, with the resistance of Concrete Structure to temperature rise period Structural Disintegration, avoid occurring crack and loose phenomenon in component surface during the maintenance of mist vapour;
Temperature rise period: conveying mist vapour heats up, and beam surface programming rate controls within 10 DEG C/h, and the heating up time is 2 ~ 3 hours, this one-phase, hydrated reaction of cement is accelerated, and forms some strength gradually, and concrete generation heat expansion is out of shape, and inside and outside the temperature difference can produce thermal stresses;
In the constant temperature stage: prestressed concrete health temperature remains on 30 DEG C, treat that concrete strength reaches 100%, after can lower the temperature, under identical curing condition, the intensity of concrete test block is concrete strength;
Temperature-fall period: cooling rate is not more than 5 DEG C/h, controls health temperature by Valve controlling water vapour spray volume, with prevent concrete surface and internal difference in temperature excessive and produce crack, and fill in mist vapour health record;
Control the concrete temperature 10 DEG C-30 DEG C in 7d after building, heating-cooling speed measurement per hour temperature, thermometer stops and is not less than 3 minutes in pipe, then take out and write down temperature, to component, namely within during the health of case beam constant temperature every 2 hours, carry out a temperature survey and record, set up health temperature and detect account, by test room, compressive strength inspection is carried out to test block, reach 100% design strength rear and allow to lower the temperature;
7th step: concrete strength reach design strength 100% and curing age when reaching seven days, remove insulation layer, remove shed support (5);
Under 30 DEG C of mist vapour health-preserving conditions, 3d, 5d, 7d, 14d, 28d age concrete compressive strength is 21.5MPa, 26.2MPa, 28.4MPa, 35.2MPa, 41.2MPa.
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