CN112942007A - Construction process of super-thick wide cement stabilized macadam base - Google Patents

Construction process of super-thick wide cement stabilized macadam base Download PDF

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Publication number
CN112942007A
CN112942007A CN202110211431.2A CN202110211431A CN112942007A CN 112942007 A CN112942007 A CN 112942007A CN 202110211431 A CN202110211431 A CN 202110211431A CN 112942007 A CN112942007 A CN 112942007A
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stabilized macadam
cement
mixture
base layer
cement stabilized
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CN202110211431.2A
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CN112942007B (en
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闫相明
周丽
闫辉
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Chengdu Construction Engineering Road And Bridge Construction Co ltd
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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C7/00—Coherent pavings made in situ
    • E01C7/08—Coherent pavings made in situ made of road-metal and binders
    • E01C7/10—Coherent pavings made in situ made of road-metal and binders of road-metal and cement or like binders
    • E01C7/14—Concrete paving
    • 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
    • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/02—Selection of the hardening environment
    • C04B40/0277—Hardening promoted by using additional water, e.g. by spraying water on the green concrete element
    • C04B40/029—Hardening promoted by using additional water, e.g. by spraying water on the green concrete element using an aqueous solution or dispersion
    • 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
    • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/04—Preventing evaporation of the mixing water
    • 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
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
    • C04B41/46—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with organic materials
    • C04B41/49—Compounds having one or more carbon-to-metal or carbon-to-silicon linkages ; Organo-clay compounds; Organo-silicates, i.e. ortho- or polysilicic acid esters ; Organo-phosphorus compounds; Organo-inorganic complexes
    • C04B41/4905—Compounds having one or more carbon-to-metal or carbon-to-silicon linkages ; Organo-clay compounds; Organo-silicates, i.e. ortho- or polysilicic acid esters ; Organo-phosphorus compounds; Organo-inorganic complexes containing silicon
    • C04B41/495—Compounds having one or more carbon-to-metal or carbon-to-silicon linkages ; Organo-clay compounds; Organo-silicates, i.e. ortho- or polysilicic acid esters ; Organo-phosphorus compounds; Organo-inorganic complexes containing silicon applied to the substrate as oligomers or polymers
    • C04B41/4961—Polyorganosiloxanes, i.e. polymers with a Si-O-Si-O-chain; "silicones"
    • 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
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/60—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only artificial stone
    • C04B41/61—Coating or impregnation
    • C04B41/62—Coating or impregnation with organic materials
    • C04B41/64—Compounds having one or more carbon-to-metal of carbon-to-silicon linkages
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C11/00—Details of pavings
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/22—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for consolidating or finishing laid-down unset materials
    • E01C19/23—Rollers therefor; Such rollers usable also for compacting soil
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/22—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for consolidating or finishing laid-down unset materials
    • E01C19/23—Rollers therefor; Such rollers usable also for compacting soil
    • E01C19/28—Vibrated rollers or rollers subjected to impacts, e.g. hammering blows
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C7/00—Coherent pavings made in situ
    • E01C7/08—Coherent pavings made in situ made of road-metal and binders
    • E01C7/10—Coherent pavings made in situ made of road-metal and binders of road-metal and cement or like binders
    • E01C7/14—Concrete paving
    • E01C7/142—Mixtures or their components, e.g. aggregate
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00—Adapting or protecting infrastructure or their operation
    • Y02A30/60—Planning or developing urban green infrastructure

Abstract

The invention discloses a construction process of an ultra-thick wide cement stabilized macadam foundation, which comprises the following steps: mixing: mixing cement, aggregate and mixing water to prepare a first mixture and a second mixture; (2) paving: and (3) paving the first mixture to form a first cement stabilized macadam base layer, spraying an aqueous solution on the first cement stabilized macadam base layer, paving the second mixture on the upper surface of the first cement stabilized macadam base layer, and paving to form a second cement stabilized macadam base layer. According to the invention, the water aqua added between the upper part and the lower part of the cement stabilized macadam base layer is adsorbed on the upper surface of the lower part, so that a suspension stabilization effect is generated, the surface tension is reduced, the wetting and the penetration of water to the mixture are accelerated, the dissolution of calcium oxide in the mixture is promoted, the surface thickening of the mixture is promoted, the coagulation promoting effect is achieved, the initial strength of the upper surface of the lower part is higher, and when the compaction process is carried out, the vibration influence can be relieved, the base layer structure is influenced, and the overall strength of the prepared.

Description

Construction process of super-thick wide cement stabilized macadam base
Technical Field
The invention relates to the technical field of cement construction, in particular to a construction process of an ultra-thick wide cement stabilized macadam foundation.
Background
The cement is a powdery hydraulic inorganic cementing material, which is added with water and stirred to form slurry, after hardening, the materials such as sand, stone and the like can be firmly cemented together, and the cement stabilized macadam is a layer structure formed by blending, paving, compacting, embedding, extruding and locking the cement and the graded macadam and is suitable for being used as a base material of a high-grade pavement. In the existing base layer construction process, the requirement on the thickness of the base layer is increased, the lower part of the base layer is provided with more pores due to the overall paving, the upper part and the lower part of the base layer are large in difference of compactness, the upper part and the lower part are sparse, and the overall strength of the cement stabilized macadam base layer is not facilitated; need carry out two-layer or even multilayer paving to the basic unit, generally adopt the cascaded construction of layering and roll the mode, when laying the upper strata, easily lead to the destruction that the basic unit had been built to the lower floor, cause the decline of bearing capacity between two upper and lower layers of basic unit, influence the bulk strength of basic unit. Therefore, a construction process for the ultra-thick wide cement stabilized macadam foundation is provided.
Disclosure of Invention
The invention aims to provide a construction process of an ultra-thick and wide cement stabilized macadam foundation, which aims to solve the problems in the background technology.
In order to solve the technical problems, the invention provides the following technical scheme: a construction process of an ultra-thick wide cement stabilized macadam foundation comprises the following steps:
mixing: mixing cement, aggregate and mixing water to prepare a first mixture and a second mixture;
(2) paving: paving the first mixture to form a first cement stabilized macadam base layer, spraying a water agent on the first cement stabilized macadam base layer, paving the second mixture on the upper surface of the first cement stabilized macadam base layer, and paving to form a second cement stabilized macadam base layer;
(3) compacting: and (3) compacting the first cement-stabilized macadam foundation layer and the second cement-stabilized macadam foundation layer formed in the step (2) to form a foundation layer.
In the technical scheme, the first cement-stabilized macadam base layer and the second cement-stabilized macadam base layer are respectively the lower part and the upper part of the base layer, and the lower part of the base layer is sprayed with an aqueous solution before the upper part of the base layer is laid, so that the water content of the upper surface of the lower part of the base layer is improved, and the difference is generated between the water content of the upper surface of the lower part of the base layer and the water content of; as the cement paste is hardened into a hydration process, water is needed to participate, the cement paste in the upper mixture can be attracted to permeate to the lower part, the rapid hydration and hardening of the cement paste between the upper interface and the lower interface of the base layer are promoted, the combination of the upper mixture and the lower part is strengthened, the interface strength is improved, the damage of subsequent compaction to the lower part is reduced, and the overall strength of cement stabilized macadam is improved.
Further, the water agent in the step (2) is: 12-27% of organic silicon, 10-20% of sodium methyl silicate, 2-6% of urea, 9-16% of fluorine-containing polyol and the balance of water.
Further, the fluorine-containing polyol is prepared by esterification reaction of hexafluoropropylene oxide and an oligomer of propylene oxide with dipentaerythritol under the action of triethylamine, wherein the molar ratio of hexafluoropropylene oxide to propylene oxide in the hexafluoropropylene oxide and propylene oxide oligomer is 1: (4-10), wherein the molar ratio of carbon-oxygen double bonds in the oligomer to hydroxyl in the dipentaerythritol is 1: (2-4), wherein the organic silicon is polyglycerol modified vinyl organic silicon.
Furthermore, the dosage of the water agent is 0.08-0.16 kg/m2The water aqua is sprayed in the form of spray.
In the technical scheme, the fluorine-containing polyol is prepared from hexafluoropropylene oxide, an oligomer of propylene oxide and dipentaerythritol, and the mixture ratio among materials ensures that fluorine bonds, ester groups and hydroxyl groups in the fluorine-containing polyol exist simultaneously, and the number of the fluorine bonds is small, so that the fluorine-containing polyol has amphipathy, can be adsorbed on the surface of the lower part of a base layer, prevents the materials in a mixture from agglutinating, generates a suspension stabilization effect, can also reduce the surface tension of the lower part of the base layer, promotes the contact of the mixture of the lower part of the base layer and water, accelerates wetting and permeation, strengthens solid phase volume expansion caused by a hydration process, and promotes the dissolution of calcium oxide in cement in water; the fluorine-containing polyol also contains fluorine, can attract calcium ions in the mixture, accelerate the dissolution of calcium oxide in the mixture, promote the surface thickening of the mixture, and achieve the coagulation promoting effect, so that the upper surface of the lower part has relatively high initial strength, and when the upper layer mixture is laid for a compaction process, the vibration influence can be relieved, the upper part mixture is prevented from moving downwards, the upper density and the lower density of the base layer are prevented from influencing the base layer structure, the lower part is prevented from being damaged and collapsed, and the bearing capacity between the upper layer and the lower layer of the base layer is prevented from being reduced; after the base course is formed, the impermeability and compactness of the base course can be improved, the interface strength between the upper part and the lower part is strengthened, and the integral strength of the cement stabilized macadam base course is improved;
the organic silicon is selected from polyglycerol modified vinyl organic silicon, a hydrophilic polyglycerol chain is linked on linear siloxane, the polyglycerol chain can form spherical micelles by self polymerization, liquid crystal is changed along with the evaporation of water when the polyglycerol modified vinyl organic silicon is sprayed on the surface of the lower part of a base layer, the elasticity is good, the lower layer structure influenced by the vibration of a compaction process can be relieved, the permeation of aqueous solution materials can be promoted by cooperating with urea, and the performance of the aqueous solution is promoted to be better; the hydrophilic polyglycerol is an outer shell layer, so that the surface tension of the lower part of the base layer can be reduced, wetting and permeation are accelerated, the compaction of the mixture is not influenced, the structural density of the prepared base layer is ensured, and the strength of the base layer is realized;
the sodium methyl silicate is subjected to dehydration condensation with silicate in the mixture to improve the interface strength between the upper part and the lower part of the base layer, and is mixed with the materials to form a film, so that the flexibility and the adhesive force of the mixture on the upper surface of the lower part of the base layer can be improved, the upper interface and the lower interface of the base layer are blurred, and the overall strength of the prepared cement stabilized macadam base layer is improved;
the combination of the materials can form a reticular film, has a certain water-blocking effect, prevents water vapor transpiration, and promotes the sufficient hydration of the lower part of the base layer.
Further, the water content of the first mixture is higher than that of the second mixture by 1-3%.
Further, the step (2) comprises the following steps:
(2.1) primary paving: spraying a water aqua on a pavement to be paved, wherein a cushion layer is arranged on the pavement, and the water aqua is used in an amount of 0.1-0.5 kg/m2Static pressure is carried out by adopting a road roller of 20t, the first mixture is taken for paving, and a first cement stabilized macadam base layer is formed by paving;
(2.2) one-time compaction: carrying out static pressure by adopting a road roller of 20t, wherein the static pressure times are 2 times, and the rolling speed is 20-30 m/min; vibrating and compacting by adopting a 32t vibrating roller, after weak vibration for 1 time, strong vibration for 1 time, rolling at the speed of 50-70 m/min, and spraying an aqueous agent on the upper surface of the first cement stabilized macadam base layer;
(2.3) secondary paving: and after the surface of the first cement stabilized macadam base layer is subjected to slurry collection and no bleeding, paving a second mixture on the upper surface of the first cement stabilized macadam base layer, and paving to form a second cement stabilized macadam base layer.
According to the technical scheme, the water content of the mixture at the lower part of the base layer is higher than that of the mixture at the upper part, the mixture is hydrated and thickened after the mixture is paved at the lower part, and when the surface of the first cement stabilized macadam base layer receives slurry and has no bleeding, the upper layer is paved, the thickening state of the upper layer is close to that of the lower layer, the same action effect can be achieved in the compaction process, and the interface difference between the upper part and the lower part of the base layer is eliminated.
Further, the step (3) comprises the following steps:
(3.1) initial pressure: carrying out static pressure by adopting a road roller of 20t, wherein the static pressure times are 2 times, and the rolling speed is 20-30 m/min;
(3.2) repressing: carrying out vibratory compaction by adopting a 32t vibratory roller, after 1 weak vibration, strongly vibrating for 3 times, and rolling at the speed of 30-50 m/min;
(3.3) final pressure: and (3) carrying out static pressure by adopting a 26t road roller, wherein the static pressure times are 2 times, and the rolling speed is 30-50 m/min.
Further, the step (3) of compacting further comprises the following steps:
(3.4) curing: and (4) after the step (3.3) is finished, immediately curing in a cloth-film covering mode, and spraying water by using a spray type watering cart for curing for 7 d.
Further, the cement in the step (1) is one or more of ordinary portland cement, portland slag cement and portland pozzolanic cement.
Further, the vibration frequency of the vibratory roller is 20-40 Hz.
Compared with the prior art, the invention has the following beneficial effects:
the construction process of the super-thick wide cement stabilized macadam foundation of the invention adds the water aqua between the upper part and the lower part of the cement stabilized macadam foundation, materials in the water aqua are adsorbed on the upper surface of the lower part to prevent the materials in the mixture from agglutinating to generate the suspension stabilization effect, and reduces the surface tension of the lower part of the base layer, promotes the contact of the mixture of the lower part of the base layer and water, accelerates wetting and permeation, strengthens the solid phase volume expansion caused by the hydration process, accelerates the dissolution of calcium oxide in the mixture, promotes the surface thickening of the mixture, achieves the coagulation promotion effect, has relatively higher initial strength on the upper surface of the lower part, when an upper layer of mixture is laid for a compaction process, the influence of vibration can be relieved, the mixture on the upper layer is prevented from moving downwards, the upper density and the lower density of the base layer are prevented from being caused, the structure of the base layer is influenced, the lower part is prevented from being damaged and collapsed, and the bearing capacity between the upper layer and the lower layer of the base layer is prevented from being reduced; after the base course is formed, the impermeability and compactness of the base course can be improved, the interface strength between the upper part and the lower part is strengthened, and the integral strength of the cement stabilized macadam base course is improved.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
(1) Mixing: mixing cement, aggregate and mixing water to prepare a first mixture and a second mixture, wherein the water content of the first mixture is higher than that of the second mixture by 2%;
(2) paving:
(2.1) paving for one time: spraying water aqua in the amount of 0.3kg/m onto road surface to be paved with cushion layer2Static pressure is carried out by adopting a road roller of 20t, the first mixture is taken for paving, and a first cement stabilized macadam base layer is formed by paving;
(2.2) one-time compaction: carrying out static pressure by adopting a road roller of 20t, wherein the static pressure frequency is 2 times, and the rolling speed is 25 m/min; vibrating and compacting by adopting a 32t vibrating roller, after weak vibration for 1 time, strong vibration for 1 time, and rolling at the rolling speed of 60m/min, and spraying an aqueous agent on the upper surface of the first cement stabilized macadam foundation layer, wherein the dosage of the aqueous agent is 0.12kg/m2；
(2.3) secondary paving: after the surface of the first cement-stabilized macadam base layer is subjected to slurry collection and no bleeding, a second mixture is taken to be paved on the upper surface of the first cement-stabilized macadam base layer to form a second cement-stabilized macadam base layer;
(3) compacting:
(3.1) initial pressure: carrying out static pressure by adopting a road roller of 20t, wherein the static pressure frequency is 2 times, and the rolling speed is 25 m/min;
(3.2) repressing: carrying out vibratory compaction by adopting a 32t vibratory roller, after carrying out weak vibration for 1 time, carrying out strong vibration for 3 times, and rolling at the rolling speed of 40 m/min;
(3.3) final pressure: static pressure is carried out by adopting a 26t road roller, the static pressure frequency is 2 times, and the rolling speed is 40 m/min;
(3.4) curing: and (4) after the step (3.3) is finished, immediately curing in a cloth-film covering mode, and spraying water by using a spray type watering cart for curing for 7 d.
Wherein the water agent is: 12% of organic silicon, 10% of sodium methyl silicate, 2% of urea, 9% of fluorine-containing polyol and the balance of water, wherein the organic silicon is polyglycerol modified vinyl organic silicon.
The fluorine-containing polyol is prepared by esterification reaction of oligomers of hexafluoropropylene oxide and propylene oxide with dipentaerythritol under the action of triethylamine, wherein the molar ratio of hexafluoropropylene oxide to propylene oxide in the oligomers of hexafluoropropylene oxide and propylene oxide is 1: 7, the molar ratio of the carbon-oxygen double bond in the oligomer to the hydroxyl in the dipentaerythritol is 1: 3.
example 2
(1) Mixing: mixing cement, aggregate and mixing water to prepare a first mixture and a second mixture, wherein the water content of the first mixture is higher than that of the second mixture by 2%;
(2) paving:
(2.1) paving for one time: spraying water aqua in the amount of 0.3kg/m onto road surface to be paved with cushion layer2Static pressure is carried out by adopting a road roller of 20t, the first mixture is taken for paving, and a first cement stabilized macadam base layer is formed by paving;
(2.2) one-time compaction: carrying out static pressure by adopting a road roller of 20t, wherein the static pressure frequency is 2 times, and the rolling speed is 25 m/min; vibrating and compacting by adopting a 32t vibrating roller, after weak vibration for 1 time, strong vibration for 1 time, and rolling at the rolling speed of 60m/min, and spraying an aqueous agent on the upper surface of the first cement stabilized macadam foundation layer, wherein the dosage of the aqueous agent is 0.12kg/m2；
(2.3) secondary paving: after the surface of the first cement-stabilized macadam base layer is subjected to slurry collection and no bleeding, a second mixture is taken to be paved on the upper surface of the first cement-stabilized macadam base layer to form a second cement-stabilized macadam base layer;
(3) compacting:
(3.1) initial pressure: carrying out static pressure by adopting a road roller of 20t, wherein the static pressure frequency is 2 times, and the rolling speed is 25 m/min;
(3.2) repressing: carrying out vibratory compaction by adopting a 32t vibratory roller, after carrying out weak vibration for 1 time, carrying out strong vibration for 3 times, and rolling at the rolling speed of 40 m/min;
(3.3) final pressure: static pressure is carried out by adopting a 26t road roller, the static pressure frequency is 2 times, and the rolling speed is 40 m/min;
(3.4) curing: and (4) after the step (3.3) is finished, immediately curing in a cloth-film covering mode, and spraying water by using a spray type watering cart for curing for 7 d.
Wherein the water agent is: 20% of organic silicon, 15% of sodium methyl silicate, 4% of urea, 12% of fluorine-containing polyol and the balance of water, wherein the organic silicon is polyglycerol modified vinyl organic silicon.
The fluorine-containing polyol is prepared by esterification reaction of oligomers of hexafluoropropylene oxide and propylene oxide with dipentaerythritol under the action of triethylamine, wherein the molar ratio of hexafluoropropylene oxide to propylene oxide in the oligomers of hexafluoropropylene oxide and propylene oxide is 1: 7, the molar ratio of the carbon-oxygen double bond in the oligomer to the hydroxyl in the dipentaerythritol is 1: 3.
example 3
(1) Mixing: mixing cement, aggregate and mixing water to prepare a first mixture and a second mixture, wherein the water content of the first mixture is higher than that of the second mixture by 2%;
(2) paving:
(2.1) paving for one time: spraying water aqua in the amount of 0.3kg/m onto road surface to be paved with cushion layer2Static pressure is carried out by adopting a road roller of 20t, the first mixture is taken for paving, and a first cement stabilized macadam base layer is formed by paving;
(2.2) one-time compaction: carrying out static pressure by adopting a road roller of 20t, wherein the static pressure frequency is 2 times, and the rolling speed is 25 m/min; vibrating and compacting by adopting a 32t vibrating roller, after weak vibration for 1 time, strong vibration for 1 time, and rolling at the rolling speed of 60m/min, and spraying an aqueous agent on the upper surface of the first cement stabilized macadam foundation layer, wherein the dosage of the aqueous agent is 0.12kg/m2；
(2.3) secondary paving: after the surface of the first cement-stabilized macadam base layer is subjected to slurry collection and no bleeding, a second mixture is taken to be paved on the upper surface of the first cement-stabilized macadam base layer to form a second cement-stabilized macadam base layer;
(3) compacting:
(3.1) initial pressure: carrying out static pressure by adopting a road roller of 20t, wherein the static pressure frequency is 2 times, and the rolling speed is 25 m/min;
(3.2) repressing: carrying out vibratory compaction by adopting a 32t vibratory roller, after carrying out weak vibration for 1 time, carrying out strong vibration for 3 times, and rolling at the rolling speed of 40 m/min;
(3.3) final pressure: static pressure is carried out by adopting a 26t road roller, the static pressure frequency is 2 times, and the rolling speed is 40 m/min;
(3.4) curing: and (4) after the step (3.3) is finished, immediately curing in a cloth-film covering mode, and spraying water by using a spray type watering cart for curing for 7 d.
Wherein the water agent is: 27% of organic silicon, 20% of sodium methyl silicate, 6% of urea, 16% of fluorine-containing polyol and the balance of water, wherein the organic silicon is polyglycerol modified vinyl organic silicon.
The fluorine-containing polyol is prepared by esterification reaction of oligomers of hexafluoropropylene oxide and propylene oxide with dipentaerythritol under the action of triethylamine, wherein the molar ratio of hexafluoropropylene oxide to propylene oxide in the oligomers of hexafluoropropylene oxide and propylene oxide is 1: 7, the molar ratio of the carbon-oxygen double bond in the oligomer to the hydroxyl in the dipentaerythritol is 1: 3.
example 4
(1) Mixing: mixing cement, aggregate and mixing water to prepare a first mixture and a second mixture, wherein the water content of the first mixture is higher than that of the second mixture by 2%;
(2) paving:
(2.1) paving for one time: spraying water aqua in the amount of 0.3kg/m onto road surface to be paved with cushion layer2Static pressure is carried out by adopting a road roller of 20t, the first mixture is taken for paving, and a first cement stabilized macadam base layer is formed by paving;
(2.2) one-time compaction: carrying out static pressure by adopting a road roller of 20t, wherein the static pressure frequency is 2 times, and the rolling speed is 25 m/min; vibrating and compacting by adopting a 32t vibrating roller, after weak vibration for 1 time, strong vibration for 1 time, and rolling at the rolling speed of 60m/min, and spraying an aqueous agent on the upper surface of the first cement stabilized macadam foundation layer, wherein the dosage of the aqueous agent is 0.12kg/m2；
(2.3) secondary paving: after the surface of the first cement-stabilized macadam base layer is subjected to slurry collection and no bleeding, a second mixture is taken to be paved on the upper surface of the first cement-stabilized macadam base layer to form a second cement-stabilized macadam base layer;
(3) compacting:
(3.1) initial pressure: carrying out static pressure by adopting a road roller of 20t, wherein the static pressure frequency is 2 times, and the rolling speed is 25 m/min;
(3.2) repressing: carrying out vibratory compaction by adopting a 32t vibratory roller, after carrying out weak vibration for 1 time, carrying out strong vibration for 3 times, and rolling at the rolling speed of 40 m/min;
(3.3) final pressure: static pressure is carried out by adopting a 26t road roller, the static pressure frequency is 2 times, and the rolling speed is 40 m/min;
(3.4) curing: and (4) after the step (3.3) is finished, immediately curing in a cloth-film covering mode, and spraying water by using a spray type watering cart for curing for 7 d.
Wherein the water agent is: 20% of organic silicon, 15% of sodium methyl silicate, 4% of urea, 12% of fluorine-containing polyol and the balance of water, wherein the organic silicon is polyglycerol modified vinyl organic silicon.
The fluorine-containing polyol is prepared by esterification reaction of oligomers of hexafluoropropylene oxide and propylene oxide with dipentaerythritol under the action of triethylamine, wherein the molar ratio of hexafluoropropylene oxide to propylene oxide in the oligomers of hexafluoropropylene oxide and propylene oxide is 1: 4, the molar ratio of the carbon-oxygen double bond in the oligomer to the hydroxyl in the dipentaerythritol is 1: 2.
example 5
(1) Mixing: mixing cement, aggregate and mixing water to prepare a first mixture and a second mixture, wherein the water content of the first mixture is higher than that of the second mixture by 2%;
(2) paving:
(2.1) paving for one time: spraying water aqua in the amount of 0.3kg/m onto road surface to be paved with cushion layer2Static pressure is carried out by adopting a road roller of 20t, the first mixture is taken for paving, and a first cement stabilized macadam base layer is formed by paving;
(2.2) one-time compaction: carrying out static pressure by adopting a road roller of 20t, wherein the static pressure frequency is 2 times, and the rolling speed is 25 m/min; vibrating and compacting by adopting a 32t vibrating roller, after weak vibration for 1 time, strong vibration for 1 time, and rolling at the rolling speed of 60m/min, and spraying an aqueous agent on the upper surface of the first cement stabilized macadam foundation layer, wherein the dosage of the aqueous agent is 0.12kg/m2；
(2.3) secondary paving: after the surface of the first cement-stabilized macadam base layer is subjected to slurry collection and no bleeding, a second mixture is taken to be paved on the upper surface of the first cement-stabilized macadam base layer to form a second cement-stabilized macadam base layer;
(3) compacting:
(3.1) initial pressure: carrying out static pressure by adopting a road roller of 20t, wherein the static pressure frequency is 2 times, and the rolling speed is 25 m/min;
(3.2) repressing: carrying out vibratory compaction by adopting a 32t vibratory roller, after carrying out weak vibration for 1 time, carrying out strong vibration for 3 times, and rolling at the rolling speed of 40 m/min;
(3.3) final pressure: static pressure is carried out by adopting a 26t road roller, the static pressure frequency is 2 times, and the rolling speed is 40 m/min;
(3.4) curing: and (4) after the step (3.3) is finished, immediately curing in a cloth-film covering mode, and spraying water by using a spray type watering cart for curing for 7 d.
Wherein the water agent is: 20% of organic silicon, 15% of sodium methyl silicate, 4% of urea, 12% of fluorine-containing polyol and the balance of water, wherein the organic silicon is polyglycerol modified vinyl organic silicon.
The fluorine-containing polyol is prepared by esterification reaction of oligomers of hexafluoropropylene oxide and propylene oxide with dipentaerythritol under the action of triethylamine, wherein the molar ratio of hexafluoropropylene oxide to propylene oxide in the oligomers of hexafluoropropylene oxide and propylene oxide is 1: 10, the molar ratio of the carbon-oxygen double bond in the oligomer to the hydroxyl in the dipentaerythritol is 1: 4.
example 6
(1) Mixing: mixing cement, aggregate and mixing water to prepare a first mixture and a second mixture, wherein the water content of the first mixture is higher than that of the second mixture by 2%;
(2) paving:
(2.1) paving for one time: spraying water aqua in the amount of 0.3kg/m onto road surface to be paved with cushion layer2Static pressure is carried out by adopting a road roller of 20t, the first mixture is taken for paving, and a first cement stabilized macadam base layer is formed by paving;
(2.2) one-time compaction: carrying out static pressure by adopting a road roller of 20t, wherein the static pressure frequency is 2 times, and the rolling speed is 25 m/min; vibrating and compacting by adopting a 32t vibrating roller, after vibrating weakly for 1 time, vibrating strongly for 1 time, and rolling at the rolling speed of 60m/min, and spraying on the upper surface of the first cement-stabilized macadam foundation layerThe dosage of the water spraying agent is 0.12kg/m2；
(2.3) secondary paving: after the surface of the first cement-stabilized macadam base layer is subjected to slurry collection and no bleeding, a second mixture is taken to be paved on the upper surface of the first cement-stabilized macadam base layer to form a second cement-stabilized macadam base layer;
(3) compacting:
(3.1) initial pressure: carrying out static pressure by adopting a road roller of 20t, wherein the static pressure frequency is 2 times, and the rolling speed is 25 m/min;
(3.2) repressing: carrying out vibratory compaction by adopting a 32t vibratory roller, after carrying out weak vibration for 1 time, carrying out strong vibration for 3 times, and rolling at the rolling speed of 40 m/min;
(3.3) final pressure: static pressure is carried out by adopting a 26t road roller, the static pressure frequency is 2 times, and the rolling speed is 40 m/min;
(3.4) curing: and (4) after the step (3.3) is finished, immediately curing in a cloth-film covering mode, and spraying water by using a spray type watering cart for curing for 7 d.
Wherein the water agent is water.
Example 7
(1) Mixing: mixing cement, aggregate and mixing water, and stirring to obtain a mixture;
(2) paving:
(2.1) paving for one time: spraying water aqua in the amount of 0.3kg/m onto road surface to be paved with cushion layer2Carrying out static pressure by adopting a road roller of 20t, taking the mixture for paving, and paving to form a first cement stabilized macadam base layer;
(2.2) one-time compaction: carrying out static pressure by adopting a road roller of 20t, wherein the static pressure frequency is 2 times, and the rolling speed is 25 m/min; vibrating and compacting by adopting a 32t vibrating roller, after weak vibration for 1 time, strong vibration for 1 time, and rolling at the rolling speed of 60m/min, and spraying an aqueous agent on the upper surface of the first cement stabilized macadam foundation layer, wherein the dosage of the aqueous agent is 0.12kg/m2；
(2.3) secondary paving: after the surface of the first cement stabilized macadam base layer is subjected to slurry collection and no bleeding, paving the mixture on the upper surface of the first cement stabilized macadam base layer to form a second cement stabilized macadam base layer;
(3) compacting:
(3.1) initial pressure: carrying out static pressure by adopting a road roller of 20t, wherein the static pressure frequency is 2 times, and the rolling speed is 25 m/min;
(3.2) repressing: carrying out vibratory compaction by adopting a 32t vibratory roller, after carrying out weak vibration for 1 time, carrying out strong vibration for 3 times, and rolling at the rolling speed of 40 m/min;
(3.3) final pressure: static pressure is carried out by adopting a 26t road roller, the static pressure frequency is 2 times, and the rolling speed is 40 m/min;
(3.4) curing: and (4) after the step (3.3) is finished, immediately curing in a cloth-film covering mode, and spraying water by using a spray type watering cart for curing for 7 d.
Wherein the water agent is: 20% of organic silicon, 15% of sodium methyl silicate, 4% of urea, 12% of fluorine-containing polyol and the balance of water, wherein the organic silicon is polyglycerol modified vinyl organic silicon.
The fluorine-containing polyol is prepared by esterification reaction of oligomers of hexafluoropropylene oxide and propylene oxide with dipentaerythritol under the action of triethylamine, wherein the molar ratio of hexafluoropropylene oxide to propylene oxide in the oligomers of hexafluoropropylene oxide and propylene oxide is 1: 7, the molar ratio of the carbon-oxygen double bond in the oligomer to the hydroxyl in the dipentaerythritol is 1: 3.
comparative example 1
(1) Mixing: mixing cement, aggregate and mixing water, and stirring to obtain a mixture;
(2) paving:
(2.1) paving for one time: spreading the mixture to form a first cement stabilized macadam base layer;
(2.2) one-time compaction: carrying out static pressure by adopting a road roller of 20t, wherein the static pressure frequency is 2 times, and the rolling speed is 25 m/min; carrying out vibratory compaction by adopting a 32t vibratory roller, after carrying out weak vibration for 1 time, carrying out strong vibration for 1 time, and rolling at the rolling speed of 60 m/min;
(2.3) secondary paving: after the surface of the first cement stabilized macadam base layer is subjected to slurry collection and no bleeding, paving the mixture on the upper surface of the first cement stabilized macadam base layer to form a second cement stabilized macadam base layer;
(3) compacting:
(3.1) initial pressure: carrying out static pressure by adopting a road roller of 20t, wherein the static pressure frequency is 2 times, and the rolling speed is 25 m/min;
(3.2) repressing: carrying out vibratory compaction by adopting a 32t vibratory roller, after carrying out weak vibration for 1 time, carrying out strong vibration for 3 times, and rolling at the rolling speed of 40 m/min;
(3.3) final pressure: static pressure is carried out by adopting a 26t road roller, the static pressure frequency is 2 times, and the rolling speed is 40 m/min;
(3.4) curing: and (4) after the step (3.3) is finished, immediately curing in a cloth-film covering mode, and spraying water by using a spray type watering cart for curing for 7 d.
Comparative example 2
(1) Mixing: mixing cement, aggregate and mixing water, and stirring to obtain a mixture;
(2) paving:
(2.1) paving for one time: spreading the mixture to form a first cement stabilized macadam base layer;
(2.2) one-time compaction: carrying out static pressure by adopting a road roller of 20t, wherein the static pressure frequency is 2 times, and the rolling speed is 25 m/min; carrying out vibratory compaction by adopting a 32t vibratory roller, after carrying out weak vibration for 1 time, carrying out strong vibration for 1 time, and rolling at the rolling speed of 60 m/min;
(2.3) secondary paving: after the first cement stabilized macadam base layer is maintained for 7d, paving the mixture on the upper surface of the first cement stabilized macadam base layer, and paving to form a second cement stabilized macadam base layer;
(3) compacting:
(3.1) initial pressure: carrying out static pressure by adopting a road roller of 20t, wherein the static pressure frequency is 2 times, and the rolling speed is 25 m/min;
(3.2) repressing: carrying out vibratory compaction by adopting a 32t vibratory roller, after carrying out weak vibration for 1 time, carrying out strong vibration for 3 times, and rolling at the rolling speed of 40 m/min;
(3.3) final pressure: static pressure is carried out by adopting a 26t road roller, the static pressure frequency is 2 times, and the rolling speed is 40 m/min;
(3.4) curing: and (4) after the step (3.3) is finished, immediately curing in a cloth-film covering mode, and spraying water by using a spray type watering cart for curing for 7 d.
Comparative example 3
(1) Mixing: mixing cement, aggregate and mixing water, and stirring to obtain a mixture;
(2) paving: spreading the mixture to form a cement stabilized macadam base layer;
(3) compacting:
(3.1) initial pressure: carrying out static pressure by adopting a road roller of 20t, wherein the static pressure frequency is 2 times, and the rolling speed is 25 m/min;
(3.2) repressing: carrying out vibratory compaction by adopting a 32t vibratory roller, after carrying out weak vibration for 1 time, carrying out strong vibration for 3 times, and rolling at the rolling speed of 40 m/min;
(3.3) final pressure: static pressure is carried out by adopting a 26t road roller, the static pressure frequency is 2 times, and the rolling speed is 40 m/min;
(3.4) curing: and (4) after the step (3.3) is finished, immediately curing in a cloth-film covering mode, and spraying water by using a spray type watering cart for curing for 7 d.
Experiment of
Taking the cement stabilized macadam base obtained in the examples 1-7 and the comparative examples 1-3 to prepare samples, respectively detecting the compactness and the strength, and recording the detection results;
difference in degree of compaction from top to bottom Degree of total compaction Difference in upper and lower compressive strengths Overall compressive strength
Example 1 0.5％ 98％ 1.7％ 3.19
Example 2 0.5％ 98％ 1.6％ 3.19
Example 3 0.5％ 98％ 1.4％ 3.20
Example 4 0.5％ 98％ 1.2％ 3.24
Example 5 0.5％ 98％ 1.6％ 3.18
Example 6 0.6％ 98％ 1.7％ 3.17
Example 7 0.7％ 98％ 2.0％ 3.18
Comparative example 1 0.8％ 97％ 1.9％ 3.15
Comparative example 2 1.3％ 96％ 3.3％ 3.12
Comparative example 3 3.4％ 96％ 10.2％ 3.07
From the data in the table above, it is clear that the following conclusions can be drawn:
the cement stabilized macadam base obtained in examples 1 to 7 is compared with the cement stabilized macadam base obtained in comparative examples 1 to 3, and the detection result shows that,
wherein the above embodiments differ in that: the content of the water agent component in examples 1 to 3 was changed; compared with the example 2, the preparation proportion of the fluorine-containing polyol in the examples 4 to 5 is changed, the water aqua in the example 6 is water, the mixture in the example 7 has no difference in water content, the water aqua is not sprayed in the comparative example 1, the second cement-stabilized macadam base layer is paved after the first cement-stabilized macadam base layer is maintained for 7d in the comparative example 2, and the whole paving is adopted in the comparative example 3.
The cement stabilized macadam foundation obtained in examples 1 to 7 was remarkably reduced in the difference between the upper and lower compactibility and the difference between the upper and lower compressive strengths, and remarkably improved in the overall compactibility and the overall compressive strength, as compared with the cement stabilized macadam foundation obtained in comparative examples 1 to 3, which fully demonstrates that the present invention achieves an improvement in the overall strength of the cement stabilized macadam foundation and a reduction in the difference between the upper and lower parts of the foundation.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Furthermore, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process method article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process method article or apparatus.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A construction process for an ultra-thick wide cement stabilized macadam foundation is characterized by comprising the following steps: the method comprises the following steps:
(1) mixing: mixing cement, aggregate and mixing water to prepare a first mixture and a second mixture;
(2) paving: paving the first mixture to form a first cement stabilized macadam base layer, spraying a water agent on the first cement stabilized macadam base layer, paving the second mixture on the upper surface of the first cement stabilized macadam base layer, and paving to form a second cement stabilized macadam base layer;
(3) compacting: and (3) compacting the first cement-stabilized macadam foundation layer and the second cement-stabilized macadam foundation layer formed in the step (2) to form a foundation layer.
2. The construction process of the ultra-thick wide cement stabilized macadam foundation according to claim 1, characterized in that: the water agent in the step (2) is: 12-27% of organic silicon, 10-20% of sodium methyl silicate, 2-6% of urea, 9-16% of fluorine-containing polyol and the balance of water.
3. The construction process of the ultra-thick wide cement stabilized macadam foundation according to claim 2, characterized in that: the fluorine-containing polyol is prepared by the esterification reaction of hexafluoropropylene oxide, an oligomer of propylene oxide and dipentaerythritol under the action of triethylamine,
the mol ratio of hexafluoropropylene oxide to propylene oxide in the hexafluoropropylene oxide and propylene oxide oligomer is 1: (4-10), wherein the molar ratio of carbon-oxygen double bonds in the oligomer to hydroxyl in the dipentaerythritol is 1: (2-4) of a first step,
the organic silicon is polyglycerol modified vinyl organic silicon.
4. The construction process of the ultra-thick wide cement stabilized macadam foundation according to claim 3, characterized in that: the dosage of the water agent is 0.08-0.16 kg/m2The water aqua is sprayed in the form of spray.
5. The construction process of the ultra-thick wide cement stabilized macadam foundation according to claim 1, characterized in that: the water content of the first mixture is higher than that of the second mixture by 1-3%.
6. The construction process of the ultra-thick wide cement stabilized macadam foundation according to claim 5, characterized in that: the step (2) comprises the following steps:
(2.1) paving for one time:spraying a water aqua on a pavement to be paved, wherein a cushion layer is arranged on the pavement, and the water aqua is used in an amount of 0.1-0.5 kg/m2Static pressure is carried out by adopting a road roller of 20t, the first mixture is taken for paving, and a first cement stabilized macadam base layer is formed by paving;
(2.2) one-time compaction: carrying out static pressure by adopting a road roller of 20t, wherein the static pressure times are 2 times, and the rolling speed is 20-30 m/min; vibrating and compacting by adopting a 32t vibrating roller, after weak vibration for 1 time, strong vibration for 1 time, rolling at the speed of 50-70 m/min, and spraying an aqueous agent on the upper surface of the first cement stabilized macadam base layer;
(2.3) secondary paving: and after the surface of the first cement stabilized macadam base layer is subjected to slurry collection and no bleeding, paving a second mixture on the upper surface of the first cement stabilized macadam base layer, and paving to form a second cement stabilized macadam base layer.
7. The construction process of the ultra-thick wide cement stabilized macadam foundation according to claim 6, characterized in that: the step (3) comprises the following steps:
(3.1) initial pressure: carrying out static pressure by adopting a road roller of 20t, wherein the static pressure times are 2 times, and the rolling speed is 20-30 m/min;
(3.2) repressing: carrying out vibratory compaction by adopting a 32t vibratory roller, after 1 weak vibration, strongly vibrating for 3 times, and rolling at the speed of 30-50 m/min;
(3.3) final pressure: and (3) carrying out static pressure by adopting a 26t road roller, wherein the static pressure times are 2 times, and the rolling speed is 30-50 m/min.
8. The construction process of the ultra-thick wide cement stabilized macadam foundation according to claim 7, characterized in that: the step (3) further comprises the following steps after compaction treatment:
(3.4) curing: and (4) after the step (3.3) is finished, immediately curing in a cloth-film covering mode, and spraying water by using a spray type watering cart for curing for 7 d.
9. The construction process of the ultra-thick wide cement stabilized macadam foundation according to claim 1, characterized in that: the cement in the step (1) is one or more of ordinary portland cement, slag portland cement and pozzolanic portland cement.
10. The construction process of the ultra-thick wide cement stabilized macadam foundation according to claim 7, characterized in that: the vibration frequency of the vibratory roller is 20-40 Hz.
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