CN111777385A - Inclined plane self-compacting concrete and pouring construction method thereof - Google Patents
Inclined plane self-compacting concrete and pouring construction method thereof Download PDFInfo
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- CN111777385A CN111777385A CN202010708104.3A CN202010708104A CN111777385A CN 111777385 A CN111777385 A CN 111777385A CN 202010708104 A CN202010708104 A CN 202010708104A CN 111777385 A CN111777385 A CN 111777385A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/12—Multiple coating or impregnating
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
- E02B3/12—Revetment of banks, dams, watercourses, or the like, e.g. the sea-floor
- E02B3/122—Flexible prefabricated covering elements, e.g. mats, strips
- E02B3/123—Flexible prefabricated covering elements, e.g. mats, strips mainly consisting of stone, concrete or similar stony material
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
- E02D17/202—Securing of slopes or inclines with flexible securing means
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
- E04D7/00—Roof covering exclusively consisting of sealing masses applied in situ; Gravelling of flat roofs
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00008—Obtaining or using nanotechnology related materials
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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Abstract
The invention provides an inclined plane self-compacting concrete which comprises the following components in parts by weight: 60-70 parts of Portland cement, 60-100 parts of coarse aggregate, 48-78 parts of fine aggregate, 15-30 parts of mineral admixture and 0.6-2.1 parts of additive; the water-to-glue ratio is 0.26-0.35; the coarse aggregate is granite pebble; the fine aggregate is river sand; the mineral admixture is a mixture of steel slag, fly ash and silicon powder, and the mass ratio of the mineral admixture is 1:1: 0.5; the additive is a water reducing agent; the steel slag is steel slag micro powder with a nano silicon dioxide surface modified. According to the method, the steel slag micro powder is subjected to surface silica modification, so that the pozzolanic activity of the steel slag micro powder is improved, a part of conventional admixture is replaced, the early strength of the doped concrete is improved, the application range of the steel slag concrete is expanded, and the production cost is reduced.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to inclined plane self-compacting concrete and a pouring construction method thereof.
Background
The concrete vibration compaction of the inclined roof is a construction problem all the time, and for controlling the casting thickness of the plate, thickness control points are uniformly distributed on the plate surface according to the thickness of 1000mm multiplied by 1000 mm. According to experience, the vibration of the beam is particularly uniform in each section by the aid of the inserted vibrator, local coarse aggregate concentration is easily caused by too long vibration time, and mortar is separated from the coarse aggregate. For the slab concrete, the excessive vibrated concrete is easy to flow, so that the flatness of the slab is difficult to control, and the vibration-free self-compacting concrete with large fluidity is an effective way for facilitating the construction of the inclined roof.
Self-compacting concrete, also known as high flow concrete, vibration-free concrete, self-leveling concrete or self-filling concrete, etc., means that concrete mixtures can fill templates and wrap reinforcing steel bars without vibration by virtue of self-weight and self-fluidity, and become concrete hardened bodies with relatively uniform performance after being hardened. The self-compacting concrete has the outstanding characteristics that the mixture has good working performance, can be uniformly and compactly filled and formed without vibration under the conditions of intensive reinforcing bars and complex template shapes, and brings great convenience for construction operation.
Self-compacting concrete is usually added with high content of mineral admixtures such as fly ash, silica fume, limestone, mineral powder and the like. The steel slag is iron-making tailings, the mineral composition of the steel slag is mainly tricalcium silicate, and secondly dicalcium silicate, an RO phase, dicalcium ferrite, free calcium oxide and iron oxide are added, the steel slag powder obtained after the steel slag is subjected to early pretreatment and grinding has certain activity, has potential conditions for being used as a concrete mineral admixture and a cement admixture, can be used as a substitute powder material of a conventional admixture of concrete, but has low admixture activity and low admixture performance, requires extremely high grinding fineness and high admixture amount, the steel slag with high admixture amount is not favorable for the growth of the early strength of the concrete, and the application of the steel slag in self-compacting concrete is limited due to the low admixture activity of the steel slag.
Disclosure of Invention
Aiming at the problems, the invention provides an inclined plane self-compacting concrete and a pouring construction method thereof.
The purpose of the invention is realized by adopting the following technical scheme:
the inclined plane self-compacting concrete comprises the following components in parts by weight: 60-70 parts of Portland cement, 60-100 parts of coarse aggregate, 48-78 parts of fine aggregate, 15-30 parts of mineral admixture and 0.6-2.1 parts of additive; the water-to-glue ratio is 0.26-0.35;
the coarse aggregate is granite pebble with the particle size of 5-16mm and is continuously graded;
the fine aggregate is river sand with fineness modulus of 2.9, and sand in a zone II;
the mineral admixture is a mixture of steel slag, fly ash and silicon powder, and the mass ratio of the mineral admixture is 1:1: 0.5;
the additive is a water reducing agent;
the steel slag is steel slag micro powder with a nano silicon dioxide surface modified;
preferably, the preparation method of the steel slag micro powder with the nano-silica surface modified comprises the following steps:
s1, crushing and grinding the steel slag, adding 1% of doped activated carbon powder, performing high-temperature heat treatment at the temperature of 800 ℃ for 1-2h in the nitrogen atmosphere, performing self-cooling, crushing and grinding, and performing magnetic separation to remove iron to obtain steel slag micro powder with the mesh particle size of not less than 200 meshes;
s2, ultrasonically dispersing nano silicon dioxide powder in water at a dispersion ratio of 25-30ml/g, adding 0.6-0.8% of dispersing agent, continuing ultrasonic dispersion treatment, adding steel slag micro powder with the mass 2-5 times that of the nano silicon dioxide powder, uniformly ultrasonically dispersing, stirring for 2-4h under the vacuum degree of 0.07-0.08MPa, filtering, leaching with dilute alkali liquor, naturally air drying, and carrying out heat treatment at 90-110 ℃ for 1h to obtain the nano silicon dioxide powder;
further preferably, the preparation method of the steel slag micro powder with the nano-silica surface modified comprises the following steps:
adding the steel slag micro powder subjected to reduction and iron removal into a silica sol solution under the stirring condition, wherein the liquid-material ratio is 20-30ml/g, the concentration of the silica sol solution is 10-30%, the particle size is 10-50nm, the pH value is 9-10, stirring is carried out for 2-4h under the vacuum degree of 0.07-0.08MPa, filtering, leaching with dilute alkali liquor, naturally drying in the air, and carrying out heat treatment for 1h at the temperature of 90-110 ℃ to obtain the steel slag micro powder;
further preferably, the preparation method of the steel slag micro powder with the nano-silica surface modified further comprises the following steps:
leaching the micro powder subjected to the leaching by using a 0.6-1% silane coupling agent solution, naturally drying and then carrying out heat treatment;
preferably, the admixture further comprises one or more of an anti-cracking agent, a water-retaining agent, a defoaming agent and a retarder;
preferably, the water reducing agent is a compound water reducing agent formed by compounding sulfamate and comb-type polycarboxylic acid;
further preferably, the mass ratio of the sulfamate to the comb-type polycarboxylic acid in the compound water reducing agent is 1: 1.6-2.2.
The invention also discloses a construction method of the inclined plane self-compacting concrete, which comprises the following steps:
(1) building an inclined roof support system;
(2) a bottom template is arranged on the inclined plane of the inclined roof supporting system;
(3) binding a reinforcement cage on one side of the bottom template, which is far away from the inclined roof support system;
(4) performing chiseling treatment on the connecting position of the inclined roof and the lower building structure;
(5) an outer formwork is erected on one side, away from the bottom formwork, of the reinforcement cage, and the outer formwork is reinforced;
(6) the self-compacting concrete is mixed according to the proportion, and the concrete feeding sequence is as follows: fully and uniformly mixing fine aggregate, portland cement, an admixture, water, an additive and coarse aggregate by using a forced mixer, and then pouring concrete;
(7) and (4) after final setting, watering and maintaining, after the concrete is solidified and reaches the specified strength, dismantling the outer template and the bottom template, and coating a curing agent on the surface of the concrete for maintaining.
The invention has the beneficial effects that:
(1) according to the method, the steel slag micro powder is subjected to surface silica modification, so that the pozzolanic activity of the steel slag micro powder is improved, a part of conventional admixture is replaced, the early strength of the doped concrete is improved, the application range of the steel slag concrete is expanded, and the production cost of the steel slag micro powder is reduced.
(2) The nano silica sol is used as a modifier, has uniform particle size and good modification effect, can be closely attached to the surface of the steel slag micro powder after heat treatment, and is beneficial to improving the pozzolanic activity of the steel slag micro powder.
(3) The silane coupling agent solution with low concentration is used for leaching, silicon-oxygen groups can be introduced to the surface of the modified steel slag micro powder, the surface lubricity of the steel slag micro powder is improved, and the silane coupling agent solution is beneficial to improving the fluidity of concrete after being mixed into the concrete.
Detailed Description
The invention is further described with reference to the following examples.
The embodiment of the invention relates to an inclined plane self-compacting concrete which comprises the following components in parts by weight: 60-70 parts of Portland cement, 60-100 parts of coarse aggregate, 48-78 parts of fine aggregate, 15-30 parts of mineral admixture and 0.6-2.1 parts of additive; the water-to-glue ratio is 0.26-0.35;
the coarse aggregate is granite pebble with the particle size of 5-16mm and is continuously graded;
the fine aggregate is river sand with fineness modulus of 2.9, and sand in a zone II;
the mineral admixture is a mixture of steel slag, fly ash and silicon powder, and the mass ratio of the mineral admixture is 1:1: 0.5;
the additive is a water reducing agent;
the steel slag is steel slag micro powder with a nano silicon dioxide surface modified;
the mineral composition of the steel slag mainly comprises tricalcium silicate, and then dicalcium silicate, RO phase, dicalcium ferrite and free calcium oxide, the steel slag powder obtained by the early pretreatment and grinding of the steel slag has certain activity, has potential conditions for being used as a concrete mineral admixture and a cement admixture, can be used as a substitute powder material of a conventional admixture of concrete, but has lower admixture activity and low admixture performance, needs extremely high powder grinding fineness, needs higher mixing amount, and the steel slag with high mixing amount is not favorable for the growth of the early strength of the concrete; according to the method, the steel slag micro powder is subjected to surface silica modification, so that the pozzolanic activity of the steel slag micro powder is improved, a part of conventional admixture is replaced, the early strength of doped concrete is improved, the application range of the steel slag concrete is expanded, and the production cost is reduced;
preferably, the preparation method of the steel slag micro powder with the nano-silica surface modified comprises the following steps:
s1, crushing and grinding the steel slag, adding 1% of doped activated carbon powder, performing high-temperature heat treatment at the temperature of 800 ℃ for 1-2h in the nitrogen atmosphere, performing self-cooling, crushing and grinding, and performing magnetic separation to remove iron to obtain steel slag micro powder with the mesh particle size of not less than 200 meshes;
s2, ultrasonically dispersing nano silicon dioxide powder in water at a dispersion ratio of 25-30ml/g, adding 0.6-0.8% of dispersing agent, continuing ultrasonic dispersion treatment, adding steel slag micro powder with the mass 2-5 times that of the nano silicon dioxide powder, uniformly ultrasonically dispersing, stirring for 2-4h under the vacuum degree of 0.07-0.08MPa, filtering, leaching with dilute alkali liquor, naturally air drying, and carrying out heat treatment at 90-110 ℃ for 1h to obtain the nano silicon dioxide powder;
further preferably, the preparation method of the steel slag micro powder with the nano-silica surface modified comprises the following steps:
adding the steel slag micro powder subjected to iron reduction and iron removal into a silica sol solution under the stirring condition, wherein the liquid-material ratio is 20-30ml/g, the concentration of the silica sol solution is 10-30%, the particle size is 10-50nm, the pH value is 9-10, stirring is carried out for 2-4h under the vacuum degree of 0.07-0.08MPa, filtering, leaching with dilute alkali liquor, naturally drying in the air, and then carrying out heat treatment for 1h at the temperature of 90-110 ℃;
the steel slag has high iron content, and the stability of the steel slag is not good when the steel slag is directly doped into concrete, so that the steel slag needs to be subjected to early treatment of activated carbon reduction and magnetic separation iron removal;
the steel slag micro powder with the modified surface nano-silica can be simply prepared by directly dispersing the nano-silica in water, the cost is lower, but the modification effect is uneven, the adsorption acting force is weaker, the nano-silica particles are easy to fall off, the nano-silica particles are easy to agglomerate, the particle size is too large, the surface adsorption modification of the steel slag is not facilitated, the nano-silica sol is used as a modifier, the particle size is even, the modification effect is good, the nano-silica sol can be tightly attached to the surface of the steel slag micro powder after heat treatment, and the pozzolanic activity of the steel slag micro powder is;
further preferably, the preparation method of the steel slag micro powder with the nano-silica surface modified further comprises the following steps:
leaching the micro powder subjected to the leaching by using a 0.6-1% silane coupling agent solution, naturally drying and then carrying out heat treatment;
the surface of the steel slag micro powder modified by the silica sol has rich hydroxyl groups, and the silicon-oxygen groups can be introduced into the surface of the modified steel slag micro powder by leaching with a low-concentration silane coupling agent solution, so that the surface lubricity of the steel slag micro powder is improved, and the improvement of the fluidity of concrete is facilitated after the steel slag micro powder is mixed into the concrete;
preferably, the admixture further comprises one or more of an anti-cracking agent, a water-retaining agent, a defoaming agent and a retarder;
in order to further improve the working performance of the concrete, various additives can be added to adapt to different application environmental conditions;
preferably, the water reducing agent is a compound water reducing agent formed by compounding sulfamate and comb-type polycarboxylic acid;
further preferably, the mass ratio of the sulfamate to the comb-type polycarboxylic acid in the compound water reducing agent is 1: 1.6-2.2.
The modified steel slag micro powder is used as a partially-substituted admixture, so that the comprehensive utilization rate of the steel slag can be improved, the production cost of concrete can be reduced, but the water absorption capacity of the steel slag is large, the requirement on the water reducing efficiency of an external water reducing agent is high, the water reducing efficiency of the comb-type polycarboxylic acid is high, the comprehensive performance is good, but the price is high, the water reducing efficiency of sulfamate is high, the cost is low, and bleeding is easily caused.
Example 1
The inclined plane self-compacting concrete comprises the following components in parts by weight: 42.5 parts of Portland cement 64 parts, coarse aggregate 70 parts, fine aggregate 56 parts, mineral admixture 18 parts and water reducing agent 0.8 part; the water-to-glue ratio is 0.31;
the coarse aggregate is granite pebble with the particle size of 5-16mm and is continuously graded;
the fine aggregate is river sand with fineness modulus of 2.9, and sand in a zone II;
the mineral admixture is a mixture of steel slag, fly ash and silicon powder, and the mass ratio of the mineral admixture is 1:1: 0.5;
the water reducing agent is prepared from sulfamate-comb type polycarboxylic acid according to the mass ratio of 1: 1.8 compounding to form a compound water reducing agent;
the steel slag is steel slag micro powder with a nano silicon dioxide surface modified;
the preparation method of the steel slag micro powder with the nano silicon dioxide surface modified comprises the following steps:
s1, crushing and grinding the steel slag, adding 1% of doped activated carbon powder, performing high-temperature heat treatment at the temperature of 800 ℃ for 1-2h in the nitrogen atmosphere, performing self-cooling, crushing and grinding, and performing magnetic separation to remove iron to obtain steel slag micro powder with the mesh particle size of not less than 200 meshes;
s2, ultrasonically dispersing the nano silicon dioxide powder in water with the dispersion ratio of 25-30ml/g, adding 0.6-0.8% of dispersing agent, continuing ultrasonic dispersion treatment, adding steel slag micro powder with the mass 4 times that of the nano silicon dioxide powder, uniformly ultrasonically dispersing, stirring for 2-4h under the vacuum degree of 0.07-0.08MPa, filtering, leaching with dilute alkali liquor, naturally drying in the air, and carrying out heat treatment for 1h at the temperature of 90-110 ℃ to obtain the nano silicon dioxide powder.
Example 2
The inclined plane self-compacting concrete comprises the following components in parts by weight: 42.5 parts of Portland cement 64 parts, coarse aggregate 70 parts, fine aggregate 56 parts, mineral admixture 18 parts and water reducing agent 0.8 part; the water-to-glue ratio is 0.31;
the coarse aggregate is granite pebble with the particle size of 5-16mm and is continuously graded;
the fine aggregate is river sand with fineness modulus of 2.9, and sand in a zone II;
the mineral admixture is a mixture of steel slag, fly ash and silicon powder, and the mass ratio of the mineral admixture is 1:1: 0.5;
the water reducing agent is prepared from sulfamate-comb type polycarboxylic acid according to the mass ratio of 1: 1.8 compounding to form a compound water reducing agent;
the steel slag is steel slag micro powder with a nano silicon dioxide surface modified;
the preparation method of the steel slag micro powder with the nano silicon dioxide surface modified comprises the following steps:
s1, crushing and grinding the steel slag, adding 1% of doped activated carbon powder, performing high-temperature heat treatment at the temperature of 800 ℃ for 1-2h in the nitrogen atmosphere, performing self-cooling, crushing and grinding, and performing magnetic separation to remove iron to obtain steel slag micro powder with the mesh particle size of not less than 200 meshes;
s2, adding the steel slag micro powder into a silica sol solution with the liquid-material ratio of 20-30ml/g, the concentration of the silica sol solution being 10-30%, the particle size being 10-50nm and the pH value being 9-10, stirring for 2-4h under the vacuum degree of 0.07-0.08MPa, filtering, leaching with dilute alkali liquor, naturally drying in the air, and then carrying out heat treatment for 1h at the temperature of 90-110 ℃ to obtain the steel slag micro powder.
Example 3
The inclined plane self-compacting concrete comprises the following components in parts by weight: 42.5 parts of Portland cement 64 parts, coarse aggregate 70 parts, fine aggregate 56 parts, mineral admixture 18 parts and water reducing agent 0.8 part; the water-to-glue ratio is 0.31;
the coarse aggregate is granite pebble with the particle size of 5-16mm and is continuously graded;
the fine aggregate is river sand with fineness modulus of 2.9, and sand in a zone II;
the mineral admixture is a mixture of steel slag, fly ash and silicon powder, and the mass ratio of the mineral admixture is 1:1: 0.5;
the water reducing agent is prepared from sulfamate-comb type polycarboxylic acid according to the mass ratio of 1: 1.8 compounding to form a compound water reducing agent;
the steel slag is steel slag micro powder with a nano silicon dioxide surface modified;
the preparation method of the steel slag micro powder with the nano silicon dioxide surface modified comprises the following steps:
s1, crushing and grinding the steel slag, adding 1% of doped activated carbon powder, performing high-temperature heat treatment at the temperature of 800 ℃ for 1-2h in the nitrogen atmosphere, performing self-cooling, crushing and grinding, and performing magnetic separation to remove iron to obtain steel slag micro powder with the mesh particle size of not less than 200 meshes;
s2, adding the steel slag micro powder into a silica sol solution with the liquid-material ratio of 20-30ml/g, the concentration of the silica sol solution being 10-30%, the particle size being 10-50nm and the pH value being 9-10, stirring for 2-4h under the vacuum degree of 0.07-0.08MPa, filtering, leaching with dilute alkali liquor, leaching with 0.6-1% silane coupling agent solution, naturally drying in the air, and carrying out heat treatment for 1h at the temperature of 90-110 ℃ to obtain the steel slag.
Performance test experiment
The self-compacting concrete prepared by taking the steel slag micro powder without surface modification of the nano silicon dioxide as the mineral admixture is used as a reference, and the rest components are the same as those in the embodiment 1;
the determination of the working technical indexes is carried out according to the national industry standard JGJ/T283-2012 'technical specification for self-compacting concrete application', the determination of the compressive strength is carried out according to the national standard GB/T50081-2002, and the results are as follows:
application example 1
A construction method of inclined plane self-compacting concrete comprises the following steps:
(1) building an inclined roof support system;
(2) a bottom template is arranged on the inclined plane of the inclined roof supporting system;
(3) binding a reinforcement cage on one side of the bottom template, which is far away from the inclined roof support system;
(4) performing chiseling treatment on the connecting position of the inclined roof and the lower building structure;
(5) an outer formwork is erected on one side, away from the bottom formwork, of the reinforcement cage, and the outer formwork is reinforced;
(6) the self-compacting concrete is mixed according to the proportion, and the concrete feeding sequence is as follows: fully and uniformly mixing fine aggregate, portland cement, an admixture, water, an additive and coarse aggregate by using a forced mixer, and then pouring concrete;
(7) and (4) after final setting, watering and maintaining, after the concrete is solidified and reaches the specified strength, dismantling the outer template and the bottom template, and coating a curing agent on the surface of the concrete for maintaining.
Application example 2
Taking the construction of a dam revetment as an example, the slope ratio is 1:3, the width is connected with the old revetment, the slope ratio is 50-80m, the total length of the two banks is 350m, the upstream and downstream revetment adopts 100mm thick gravel cushion layers and 200mm thick cast-in-place concrete, the longitudinal and transverse parting length of a concrete panel is 2.0m, the concrete panel is arranged in a staggered manner, and a joint cutter is used for cutting joints; the construction process comprises the following steps:
1. leveling of embankment slope foundation surface
Mechanically repairing a slope on the basis of rough sample, reserving a protective layer with a certain thickness, then accurately lofting, binding a pile at every 5m of the top of the slope, enabling the pile to be parallel to the axis of the embankment body, measuring the elevation of the concrete surface at the piling position on the pile, drawing a line from the point to a slope toe to enable the slope toe to be perpendicular to the axis of the embankment body, piling and fixing, similarly measuring the elevation of the concrete surface at the inner edge line of the slope toe on each slope toe pile, drawing a 1:3 slope line between the elevation points corresponding to the top of the slope, and manually repairing the slope according to the line;
2. laying of gravel cushion
The gravel cushion layer is required to be uniform, flat and compact, the paving is mainly mechanical, the paving is manually assisted, and the elevation of the top surface of the cushion layer is controlled by using a control line which is hung in advance;
3. formwork support and drain pipe installation
The template is made of channel steel, the back of the template is provided with a welded steel bar support and a connecting steel pipe so as to be fixed by a steel bar pile conveniently, the template support is in a quincunx shape, the odd number plate block in the first plate block is supported and then the even number plate block in the second plate block is supported and then the odd number plate block in the third plate block and the even number plate block in the fourth plate block are supported, an elevation line for controlling the gradient of the template is measured before the template support, and the template is fixed by the steel bar pile. Pre-buried drain pipes in the revetment are fixed by a preformed hole system to ensure the accurate position of the pre-buried drain pipes, and sundries in a bin are removed after a template is supported;
the concrete slope protection plate is provided with phi 50PVC drain pipes with the space of 2.0m, and the inlets of the pipes are all bound with 300g/m2One layer of geotextile;
4. pouring of concrete
The self-compacting concrete is mixed according to the proportion, and the concrete feeding sequence is as follows: fully and uniformly mixing fine aggregate, portland cement, admixture, water, admixture and coarse aggregate by using a forced mixer, conveying concrete to the top of a slope protection slope, arranging a chute on the slope surface, warehousing the concrete through the chute, arranging an expansion joint every 20m of the slope protection slope, and filling foam boards;
5. and (5) removing the template after the concrete is cured to the specified strength.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (9)
1. The inclined plane self-compacting concrete is characterized by comprising the following components in parts by weight: 60-70 parts of Portland cement, 60-100 parts of coarse aggregate, 48-78 parts of fine aggregate, 15-30 parts of mineral admixture and 0.6-2.1 parts of additive; the water-to-glue ratio is 0.26-0.35;
the coarse aggregate is granite pebble with the particle size of 5-16mm and is continuously graded;
the fine aggregate is river sand with fineness modulus of 2.9, and sand in a zone II;
the mineral admixture is a mixture of steel slag, fly ash and silicon powder, and the mass ratio of the mineral admixture is 1:1: 0.5;
the additive is a water reducing agent;
the steel slag is steel slag micro powder with a nano silicon dioxide surface modified.
2. The inclined plane self-compacting concrete as claimed in claim 1, wherein the preparation method of the nano-silica surface modified steel slag micropowder comprises the following steps:
s1, crushing and grinding the steel slag, adding 1% of doped activated carbon powder, performing high-temperature heat treatment at the temperature of 800 ℃ for 1-2h in the nitrogen atmosphere, performing self-cooling, crushing and grinding, and performing magnetic separation to remove iron to obtain steel slag micro powder with the mesh particle size of not less than 200 meshes;
s2, ultrasonically dispersing the nano silicon dioxide powder in water with the dispersion ratio of 25-30ml/g, adding 0.6-0.8% of dispersing agent, continuing ultrasonic dispersion treatment, adding steel slag micro powder with the mass 2-5 times that of the nano silicon dioxide powder, stirring for 2-4h under the vacuum degree of 0.07-0.08MPa after uniform ultrasonic dispersion, filtering, leaching with dilute alkali liquor, naturally drying, and carrying out heat treatment for 1h at the temperature of 90-110 ℃ to obtain the nano silicon dioxide powder.
3. The inclined plane self-compacting concrete as claimed in claim 1, wherein the preparation method of the nano-silica surface modified steel slag micropowder comprises the following steps:
adding the steel slag micro powder subjected to iron reduction and removal into a silica sol solution under the stirring condition, wherein the liquid-material ratio is 20-30ml/g, the concentration of the silica sol solution is 10-30%, the particle size is 10-50nm, the pH value is 9-10, stirring is carried out for 2-4h under the vacuum degree of 0.07-0.08MPa, filtering, leaching with dilute alkali liquor, naturally drying in the air, and carrying out heat treatment for 1h at the temperature of 90-110 ℃ to obtain the steel slag.
4. The inclined plane self-compacting concrete as claimed in claim 3, wherein the preparation method of the nano-silica surface modified steel slag micropowder further comprises the steps of:
and leaching the micro powder subjected to the leaching by using a 0.6-1% silane coupling agent solution, naturally drying, and then carrying out heat treatment.
5. The self-compacting concrete on inclined planes as claimed in claim 1, wherein the admixture further comprises one or more of anti-cracking agent, water-retaining agent, defoaming agent and retarder.
6. The inclined plane self-compacting concrete of claim 1, wherein the water reducing agent is a compound water reducing agent formed by compounding sulfamate and comb-type polycarboxylic acid.
7. The inclined plane self-compacting concrete of claim 6, wherein the mass ratio of sulfamate to comb-type polycarboxylic acid in the compound water reducer is 1: 1.6-2.2.
8. The construction method of the self-compacting concrete pouring sloping roof as claimed in one of the claims 1 to 7, characterized in that it comprises the following steps:
(1) building an inclined roof support system;
(2) a bottom template is arranged on the inclined plane of the inclined roof supporting system;
(3) binding a reinforcement cage on one side of the bottom template, which is far away from the inclined roof support system;
(4) performing chiseling treatment on the connecting position of the inclined roof and the lower building structure;
(5) an outer formwork is erected on one side, away from the bottom formwork, of the reinforcement cage, and the outer formwork is reinforced;
(6) the self-compacting concrete is mixed according to the proportion, and the concrete feeding sequence is as follows: fully and uniformly mixing fine aggregate, portland cement, an admixture, water, an additive and coarse aggregate by using a forced mixer, and then pouring concrete;
(7) and (4) after final setting, watering and maintaining, after the concrete is solidified and reaches the specified strength, dismantling the outer template and the bottom template, and coating a curing agent on the surface of the concrete for maintaining.
9. The slope protection construction method of self-compacting concrete according to any one of claims 1 to 7, comprising the steps of:
(1) leveling the base surface of the embankment slope;
(2) paving a gravel cushion layer;
(3) installing a template support and presetting a drain pipe;
(4) concrete stirring and pouring: the self-compacting concrete is mixed according to the proportion, and the concrete feeding sequence is as follows: fully and uniformly mixing fine aggregate, portland cement, an admixture, water, an additive and coarse aggregate by using a forced mixer, and then putting the concrete into a bin for pouring;
(5) and (5) removing the template and curing the concrete.
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| CN113550499A (en) * | 2021-06-07 | 2021-10-26 | 中国五冶集团有限公司 | Concrete construction method for antique slope roof |
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| CN113380348B (en) * | 2021-07-03 | 2022-12-13 | 安徽东材材料科技有限公司 | Preparation method and system of steel slag-based mineral admixture |
| CN114014569A (en) * | 2021-11-15 | 2022-02-08 | 吴联权 | Production process for separating and recycling metal smelting furnace slag |
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