CN111170696A - Sidewalk and construction process thereof - Google Patents
Sidewalk and construction process thereof Download PDFInfo
- Publication number
- CN111170696A CN111170696A CN202010053613.7A CN202010053613A CN111170696A CN 111170696 A CN111170696 A CN 111170696A CN 202010053613 A CN202010053613 A CN 202010053613A CN 111170696 A CN111170696 A CN 111170696A
- Authority
- CN
- China
- Prior art keywords
- aggregate
- concrete
- recycled
- strength
- raw materials
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
-
- 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
- E01C15/00—Pavings specially adapted for footpaths, sidewalks or cycle tracks
-
- 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
- E01C5/00—Pavings made of prefabricated single units
- E01C5/06—Pavings made of prefabricated single units made of units with cement or like binders
- E01C5/065—Pavings made of prefabricated single units made of units with cement or like binders characterised by their structure or component materials, e.g. concrete layers of different structure, special additives
-
- 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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
-
- 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
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Road Paving Structures (AREA)
Abstract
The invention relates to a sidewalk and a construction process thereof, relating to the technical field of building construction, wherein the sidewalk comprises high-strength concrete bricks, M10 cement mortar, a C20 concrete cushion layer, a gravel cushion layer and pond residues from top to bottom; the high-strength concrete brick is prepared from the following raw materials in parts by weight: 180-200 parts of ordinary portland cement; 1100-1200 parts of coarse aggregate; 160-180 parts of an active admixture; 30-50 parts of rubber powder; 20-40 parts of reinforcing fibers; 10-30 parts of polyvinyl alcohol; 4-8 parts of a polycarboxylic acid water reducing agent; 180-220 parts of water; the coarse aggregate comprises 20-40% of natural macadam and 60-80% of modified recycled aggregate. The recycled aggregate is modified to improve the strength of the recycled aggregate, so that the strength and the application range of recycled concrete are improved.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a sidewalk and a construction process thereof.
Background
With the rapid development of economy in China, a large amount of waste building materials are generated by dismantling old infrastructure and building new infrastructure, wherein waste concrete accounts for about 30% of building garbage, and except for a few low-level waste concrete which is recycled for non-bearing structures such as roadbed base layers, most waste concrete is buried or stacked, so that the environment is polluted, and resources are wasted.
The existing solution is to mix the construction waste with the grading according to a certain proportion after the treatment of crushing, cleaning, grading and the like to prepare the concrete brick, thereby realizing the reutilization of the construction waste and obviously saving the cost. However, the recycled concrete brick has low strength and poor durability due to the characteristics of large crushing index, high water absorption, large porosity, low apparent density and the like of the recycled aggregate, so that the recycled concrete brick is frequently applied to low strength requirement and the application range of the recycled concrete brick is influenced.
Disclosure of Invention
The invention aims to provide a sidewalk, which is used for improving the strength of recycled aggregate by modifying the recycled aggregate, so that the strength and the application range of recycled concrete are improved;
the invention also aims to provide a construction process of the sidewalk, which utilizes the change of the feeding amount and the feeding sequence to respectively carry out the shell building effect on the natural coarse aggregate and the recycled coarse aggregate so as to improve the strength of the recycled aggregate and further improve the strength and the application range of the recycled concrete.
The above object of the present invention is achieved by the following technical solutions:
a sidewalk comprises high-strength concrete bricks, M10 cement mortar, a C20 concrete cushion layer, a broken stone cushion layer and pond residues from top to bottom;
the high-strength concrete brick is prepared from the following raw materials in parts by weight:
the coarse aggregate comprises 20-40% of natural macadam and 60-80% of modified recycled aggregate.
By adopting the technical scheme, R42.5 is adopted as the ordinary portland cement. The active admixture can reduce the use of cement and improve the performance of concrete, and can react with calcium oxide generated by cement hydration to generate hydration products with gelling capacity, thereby improving the strength of concrete. The reinforced fibers are distributed in the concrete in a disorderly direction to form a three-dimensional network structure, play a role in supporting aggregates in the concrete, prevent the sedimentation of coarse aggregates, and the fiber materials distributed in the concrete in the disorderly direction can bear tensile stress, limit and reduce the generation and expansion of cracks, reduce the number of communicated cracks and improve the strength and toughness of the concrete. The water is a common local source of water, such as tap water. The natural macadam is 20-40%, the modified recycled aggregate is 60-80%, and the strength and cost of the recycled concrete are both most suitable under the mixture ratio. The amount of the natural macadam is more than 30-50%, and the cost is greatly improved although the strength of the concrete is improved. The amount of the natural macadam is less than 30-50%, the cost is reduced, but the strength reduction range is too large. The recycled aggregate is modified to improve the strength of the recycled aggregate, so that the strength and the application range of recycled concrete are improved. The rubber powder can endow the recycled concrete with good ductility and crack resistance, and has the functions of shock absorption, air permeability and water permeability. The rubber powder can be made of waste automobile tires.
Since many cavities are formed in the concrete during the hardening process, moisture is easily accumulated in the cavities. As the cement cures and dries, these cavities become weaker sites in the cement matrix. Polyvinyl alcohol is added, which will fill the cavity with water. As the drying process proceeds, the polyvinyl alcohol is dehydrated and polymerized again to form a thin film of polyvinyl alcohol, which is continuously distributed around the cavity formed when the cement is cured. The continuous polymer film attached to the hole wall can effectively absorb the stress from the outside, thereby improving the comprehensive performance of the recycled concrete. The polyvinyl alcohol can also be used as a dispersing agent to improve the dispersing effect of each raw material and avoid the raw materials from agglomerating in the mixing process, thereby influencing the strength of the regenerated pervious concrete.
The invention is further configured to: the modified recycled aggregate is prepared by the following process steps:
step 1: selecting, crushing and screening the waste concrete to prepare recycled aggregate;
step 2: soaking the recycled aggregate prepared in the step 1 in a reinforcing agent for 8-12h, fishing out the recycled aggregate and drying to obtain the reinforced aggregate;
and step 3: and (3) soaking the reinforced aggregate prepared in the step (2) in a reinforcing agent for 8-12h, and then fishing out the reinforced aggregate and drying to obtain the modified recycled aggregate.
By adopting the technical scheme, the recycled aggregate is immersed in the reinforcer and is used for filling cracks on the surface of the recycled aggregate, and the apparent density of the recycled aggregate is improved, so that the strength of the recycled aggregate is improved. And then, the recycled aggregate is immersed in the water repellent agent to reduce the water absorption of the recycled aggregate and reduce the waste of water resources. Meanwhile, the concrete brick is prevented from being corroded by water flow such as rainwater and the like, and the strength of the concrete brick is prevented from being influenced. And the water permeability of the recycled concrete brick can be improved, rainwater can be conveniently leaked, and the rainwater is prevented from staying on the surface and inside the recycled concrete brick, so that the walking of people is influenced. The soaking time of the recycled aggregate in the enhancer and the hydrophobing agent is 8-12h, so that the adhesion amount of the enhancer and the hydrophobing on the surface of the recycled aggregate is controlled, and the phenomenon that the adhesion amount is too large to influence the connection tightness between the recycled aggregate and the cement so as to influence the strength of the recycled concrete is prevented.
The invention is further configured to: the enhancer comprises the following raw materials in percentage by weight:
by adopting the technical scheme, the reinforcing filler is used for filling gaps inside the recycled aggregate, and the strength of the recycled aggregate is improved. The water glass has good permeability, can effectively permeate and fill in mesopores on the surface of the recycled aggregate, effectively reduces the diameter and the amount of the pores, and promotes the hydration speed of cement to a certain extent, thereby strengthening the surface hardness of the recycled aggregate. The water glass can also be used as a binder, so that the adhesion of the reinforcing filler on the surface of the aggregate is improved, and the strength of the recycled aggregate is further improved. Meanwhile, the water glass has more hydroxyl groups with higher activity, and the hydroxyl group content on the surface of the aggregate can be increased, so that the adhesion effect of the hydrophobic agent on the surface of the aggregate is improved, and the hydrophobic effect of the aggregate is improved. The emulsifier OP-10 is used for reducing the interfacial tension between the raw materials, improving the dispersibility of the raw materials in water, forming a uniform and stable emulsion and further improving the adhesion effect of the raw materials on the surface of the aggregate.
The invention is further configured to: the reinforcing filler comprises the following raw materials in percentage by weight:
20-40% of graphene oxide;
30-40% of magnesium-aluminum hydrotalcite;
30-40% of nano calcium carbonate.
By adopting the technical scheme, the graphene oxide, the magnesium-aluminum hydrotalcite and the nano calcium carbonate have good strength, and the strength of the recycled aggregate can be effectively improved, so that the strength of the recycled concrete is improved, and the lane is endowed with good strength. And the surfaces of the graphene oxide and the magnesium-aluminum hydrotalcite have more hydroxyl groups with higher activity, so that the hydroxyl amount on the surface of the aggregate can be increased, the adhesion effect of the hydrophobing agent on the surface of the aggregate is improved, and the hydrophobic effect of the aggregate is improved. Meanwhile, the graphene oxide, the magnesium-aluminum hydrotalcite and the nano calcium carbonate have good carbonization resistance and chloride ion resistance. The graphene oxide can effectively disperse the adhesion materials and prevent agglomeration, so that the adhesion effect of the graphene oxide, the magnesium-aluminum hydrotalcite and the nano calcium carbonate on the surface of the aggregate is improved, and the strength of the aggregate is effectively improved. After the water glass is hardened, acidic silica is precipitated on the surface of the aggregate, thereby affecting the adhesion effect of the hydrophobic agent on the surface of the aggregate. The magnesium-aluminum hydrotalcite is a layered double hydroxide, has an alkaline pH value and a negatively charged surface, can react with silica precipitated on the surface of the aggregate, facilitates the adhesion effect of a hydrophobizing agent on the surface of the aggregate, endows the aggregate with a good hydrophobic effect, and reduces the water absorption of the aggregate. The nano calcium carbonate is uniformly distributed on the surface of the aggregate to form a compact surface structure, the directional arrangement performance of hydration products is obviously improved, and the nano calcium carbonate can be uniformly distributed in pores, so that the nano calcium carbonate has a good filling effect, can well repair cracks on the surface of the recycled aggregate, enables the surface structure of the aggregate to be more compact, and improves the strength of the aggregate.
The invention is further configured to: the hydrophobic coating comprises the following raw materials in percentage by weight:
by adopting the technical scheme, the silica sol is a dispersion liquid of nano-scale silica particles in water or a solvent. The calcium silicate-calcium hydroxide composite material has stronger penetrability on a base layer, can permeate into the base layer through a capillary, and can react with calcium hydroxide on the surface of aggregate to generate calcium silicate, so that the adhesion effect of a hydrophobing agent on the surface of the aggregate is improved, the strength of the aggregate is improved, and the aggregate is endowed with a good hydrophobic effect.
The polyhydroxyethyl methacrylate is a good adhesive and a film-forming agent, and can be well attached to the surface of the aggregate to form a film layer on the surface of the aggregate.
The fluorinated polyurethane has ultralow surface energy, can endow aggregate with good hydrophobicity, and reduces the water absorption of the aggregate.
The polyhydroxyethyl methacrylate can be hydrolyzed to generate hydroxyl, and the hydroxyl on the surface of the aggregate can be subjected to condensation reaction, so that the adhesion effect of the fluorinated polyurethane on the surface of the aggregate is improved, and the aggregate is endowed with a good hydrophobic effect. And the hydroxyl generated by hydrolysis of the polyhydroxyethyl methacrylate can perform condensation reaction with the hydroxyl on the surface of the portland cement, so that the bonding effect of the aggregate and the portland cement is improved, the compactness of the concrete brick is improved, and the strength of the concrete brick is improved.
The polyvinyl alcohol is added and can be used as an adhesive to improve the bonding effect of the aggregate and the portland cement, thereby improving the compactness and the strength of the concrete brick. And the surface of the polyvinyl alcohol has more hydroxyl groups with higher activity, so that the hydroxyl content of the hydroxyl groups on the surface of the cement can be increased, the bonding effect of the aggregate and the portland cement is improved, and the compactness and the strength of the concrete brick are improved.
The silica sol and the polyhydroxyethyl methacrylate can form a micro-nano mastoid structure on the surface of the aggregate, a plurality of micro-pores are formed on the surface of the gathered micro-nano mastoid structure, and the specific surface area of the aggregate is greatly increased due to the pores. Therefore, more air can be captured on the surface of the aggregate to form air pockets for increasing the interfacial tension between the surface of the aggregate and water and endowing the aggregate with good hydrophobicity.
When the solvent volatilizes, the polyhydroxyethyl methacrylate and the fluorinated polyurethane can generate phase separation, so that a micro-nano mastoid structure with certain roughness can be formed on the surface of the aggregate. Meanwhile, fluorinated polyurethane with low surface energy tends to be on the surface of the polymer, and polyhydroxyethyl methacrylate with high surface energy tends to be polymerized in the polymer, so that a film with a certain rough structure and low surface energy is formed, and the aggregate is endowed with a good hydrophobic effect. The film has a self-repairing function similar to lotus leaves, and the outermost layer of the surface of the film still has the super-hydrophobic and self-cleaning functions under the damaged condition.
The gamma-aminopropyl triethoxysilane can improve the adhesion effect of the hydrophobic agent on the surface of the aggregate, thereby effectively reducing the water absorption of the aggregate. Meanwhile, the bonding density between the aggregate and the concrete is improved, and the compactness of the concrete brick is improved, so that the strength of the concrete brick is improved. And the gamma-aminopropyltriethoxysilane is alkaline and can react with hardened silicon dioxide on the surface of the reinforced aggregate to neutralize the acidic silicon dioxide on the surface of the aggregate and improve the adhesion effect of the hydrophobic agent on the surface of the aggregate.
The cationic surfactant octadecyl dimethyl benzyl ammonium chloride is used for improving the solubility of the raw materials in water and forming uniform and stable emulsion, thereby improving the adhesion effect of the raw materials on the surface of aggregate. The white surface of the magnesium-aluminum hydrotalcite has negative charges, so that the surface of the reinforced aggregate has the large charges, and the cationic surfactant octadecyl dimethyl benzyl ammonium chloride is added, so that the adhesion effect of the hydrophobic agent on the reinforced aggregate can be improved. And the surface of the modified recycled aggregate is provided with positive charges, so that the adhesion effect of cement on the surface of the modified recycled aggregate is improved, and the shell-making effect on the surface of the modified recycled aggregate is facilitated, so that the strength of the modified recycled aggregate is improved, the cement stabilized macadam base layer and the cement stabilized macadam subbase layer are endowed with good strength and performance, the strength of a driving road is improved, and the production cost is reduced.
The ethanol is used as a solvent, can improve the solubility of organic matters in water, and gives good hydrophobic effect to the aggregate by a method for constructing a rough surface by generating multiphase separation in a film forming process by utilizing the solubility difference of polymer or inorganic particle suspension in different solvents.
The invention is further configured to: the reinforced fiber comprises the following raw materials in percentage by weight:
by adopting the technical scheme, the polyvinyl alcohol fiber has high strength, large elastic modulus and large bonding strength with concrete, and can improve the strength and toughness of the concrete; the polypropylene fiber has small diameter and good dispersion effect, can effectively inhibit the crack development of early concrete caused by segregation, shrinkage and other factors, and makes up for the deficiencies by compounding the two fiber materials, thereby improving the strength and toughness of the concrete brick. The surfaces of the polyvinyl alcohol fiber and the polypropylene fiber are provided with more active hydroxyl groups, and the hydroxyl groups can react with the polyhydroxyethyl methacrylate on the surface of the modified recycled aggregate to improve the bonding strength between the aggregate and the fiber, thereby improving the bonding strength of the fiber to the concrete brick
The Tween-80 is used for changing the surface energy of the polyvinyl alcohol fibers and the polypropylene fibers and improving the dispersion effect of the polyvinyl alcohol fibers and the polypropylene fibers in the concrete, so that the polyvinyl alcohol fibers and the polypropylene fibers can be uniformly distributed in the concrete, and the strength of the concrete brick is improved. And the polyvinyl alcohol fiber and the polypropylene fiber can be firstly interlaced and twisted together to form a mixed fiber. The mixed fiber for simultaneously mixing the two fibers can effectively inhibit the crack development of early concrete caused by segregation, shrinkage and other factors, and can effectively improve the strength and toughness of the concrete.
The invention is further configured to: the active admixture comprises the following raw materials in percentage by weight:
50-60% of fly ash;
20-30% of granulated blast furnace slag powder;
10-30% of superfine silicon powder.
By adopting the technical scheme, the fly ash, the granulated blast furnace slag powder and the superfine silicon powder can be subjected to secondary hydration, so that Ca (OH)2 in a system can be absorbed, more low-alkalinity C-S-H gel is generated, and gaps in the recycled aggregate due to external extrusion can be filled.
The second aim of the invention is realized by the following technical scheme:
a construction process of a sidewalk comprises the following construction processes:
1) preparing a high-strength concrete brick:
A. stirring natural coarse aggregate and 70% of water in the raw materials for 20-30s according to a proportion, adding ordinary portland cement, polyvinyl alcohol, rubber powder, reinforcing fiber and an active admixture according to a proportion, stirring for 20-30s, adding a polycarboxylic acid water reducing agent and the rest water in the raw materials, stirring for 20-30s, adding modified recycled aggregate, and stirring for 100-150s to prepare a recycled concrete mixture;
B. b, laying the recycled concrete mixture prepared in the step A in a mould, performing vibration extrusion forming, demolding, and curing to obtain a high-strength concrete brick;
2) and (3) paving pond residues with the thickness of not less than 30cm on the plain soil compacted soil foundation, compacting, then paving a 10cm broken stone cushion layer, a 10cm thick C20 concrete cushion layer, 4cm M10 cement mortar and 6cm high-strength concrete bricks in sequence, and obtaining the sidewalk after paving.
By adopting the technical scheme, the natural coarse aggregate is firstly put in and the first part of water is added for wetting and stirring, then the put cement is immediately adhered to the water film on the surface of the natural aggregate, the hydration reaction of the cement is strengthened, the diffusion of crystals is limited, the interface layer is strengthened, and the compact low cement-to-cement ratio mortar shell is formed on the surface of the natural aggregate. When the recycled coarse aggregate is added, the cement mortar and the recycled aggregate which are uniformly stirred are stirred again, and the recycled coarse aggregate cannot directly contact with water because the water is dispersed between the cement and the sand, so that a large amount of water absorption of the recycled coarse aggregate is inhibited, and the thickness of a water film is reduced. The recycled coarse aggregate is directly contacted with cement mortar, so that the cement sand rack is wrapped on the surface of the aggregate. In addition, the high water absorption of the recycled coarse aggregate naturally causes a relatively low cement-to-ash ratio shell on the surface of the recycled coarse aggregate, also fills cracks and pores of the recycled aggregate, and enhances an interface transition zone. By the shell-making effect of the secondary shell-making stirring process, the interface transition area of the coarse aggregate and the set cement in the recycled aggregate concrete is more compact, the microstructure of the recycled aggregate concrete is improved, and the strength and the related performance of the concrete are enhanced. The road surface construction process, the technical requirements and the acceptance standard are executed according to the technical Specification for road surface construction (JTG40-2004) and the Specification for urban road engineering construction and quality acceptance (CJJ 1-2008).
In conclusion, the beneficial technical effects of the invention are as follows:
1. the strength of the recycled aggregate is improved by modifying the recycled aggregate, so that the strength and the application range of recycled concrete are improved;
2. the shell building effect is respectively carried out on the natural coarse aggregate and the recycled coarse aggregate by changing the feeding amount and the feeding sequence, so that the strength of the recycled aggregate is improved, and the strength and the application range of the recycled concrete are improved.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Reference numerals: 100. high strength concrete bricks; 200. m10 cement mortar; 300. c20 concrete cushion; 400. a gravel cushion layer; 500. and (4) pond residues.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, the sidewalk disclosed by the present invention comprises, from top to bottom, a high-strength concrete brick 100, an M10 cement mortar 200, a C20 concrete cushion layer 300, a crushed stone cushion layer 400 and pond residues 500;
the high-strength concrete brick is prepared from the following raw materials in parts by weight:
wherein, the coarse aggregate comprises 30 percent of natural macadam and 70 percent of modified recycled aggregate by weight percentage;
the modified recycled aggregate is prepared by the following process steps:
step 1: selecting, crushing and screening the waste concrete to prepare recycled aggregate;
step 2: soaking the recycled aggregate prepared in the step 1 in a reinforcing agent for 10 hours, and then fishing out the recycled aggregate and drying to obtain the reinforced aggregate;
and step 3: soaking the reinforced aggregate prepared in the step 2 in a reinforcing agent for 10 hours, and then fishing out the reinforced aggregate and drying to obtain modified recycled aggregate;
wherein, the enhancer consists of the following raw materials in percentage by weight:
the production steps of the enhancer are as follows: uniformly mixing deionized water, water glass, a reinforcing filler and an emulsifier OP-10 according to a proportion, and performing ultrasonic dispersion for 30min to prepare a reinforcing agent;
wherein, the reinforcing filler comprises the following raw materials in percentage by weight:
30% of graphene oxide;
35% of magnesium-aluminum hydrotalcite;
35% of nano calcium carbonate;
wherein the hydrophobic agent comprises the following raw materials in percentage by weight:
the preparation steps of the water repellent agent are as follows: uniformly mixing deionized water, polyhydroxyethyl methacrylate, fluorinated polyurethane, silica sol, gamma-aminopropyltriethoxysilane, octadecyl dimethyl benzyl ammonium chloride and ethanol according to a proportion, and performing ultrasonic dispersion for 20min to prepare a hydrophobing agent;
the ethanol is absolute ethanol;
wherein, the reinforced fiber comprises the following raw materials by weight percent:
the reinforced fiber manufacturing steps are as follows: uniformly mixing deionized water, tween-80, polypropylene fiber and polyvinyl alcohol fiber in proportion, and ultrasonically dispersing for 20min to obtain reinforced fiber;
wherein the active admixture comprises the following raw materials in percentage by weight:
55% of fly ash;
25% of granulated blast furnace slag powder;
20% of superfine silicon powder;
the sidewalk comprises the following construction process:
A. stirring natural coarse aggregate and 70% of water in the raw materials for 25s according to the proportion, adding ordinary portland cement, polyvinyl alcohol, rubber powder, reinforcing fiber and an active admixture, stirring for 25s, adding a polycarboxylic acid water reducing agent and the rest water in the raw materials, stirring for 25s, adding modified recycled aggregate, and stirring for 130s to prepare a recycled concrete mixture;
B. b, laying the recycled concrete mixture prepared in the step A in a mould, performing vibration extrusion forming, demolding, and curing to obtain a high-strength concrete brick;
2) and paving 116cm thick pond residues 500 on the plain soil tamped soil foundation, compacting, then paving 10cm broken stone cushion 400, 10cm thick C20 concrete cushion 300, 4cm M10 cement mortar 200 and 6cm high-strength concrete brick 100 in sequence, and preparing the sidewalk after paving.
The sidewalk is applied to a new construction of east lake road in the road network construction project of the water board area under the shaoxing law.
Examples 2 to 5 differ from example 1 in that the high-strength concrete brick comprises the following raw materials in parts by weight:
examples 6-9 differ from example 1 in that the coarse aggregate comprises the following raw materials in weight percent:
examples 10 to 13 differ from example 1 in that the fortifier comprises the following raw materials in weight percent:
examples 14-17 differ from example 1 in that the reinforcing filler comprises the following raw materials in weight percent:
examples 18-21 differ from example 1 in that the hydrophobizing agent comprises the following raw materials in weight percent:
examples 22-25 differ from example 1 in that the reinforcing fibers comprise the following raw materials in weight percent:
examples 26-29 differ from example 1 in that the active admixture comprises the following raw materials in weight percent:
examples 30-33 differ from example 1 in that the recycled aggregate is soaked in the fortifier for the time indicated in the table below in step 2:
| examples | Example 30 | Example 31 | Example 32 | Example 33 |
| Time/h | 8 | 9 | 11 | 12 |
Examples 34-37 differ from example 1 in that the enhanced aggregate in step 3 is soaked in the hydrophobic agent for a period of time as shown in the following table:
| examples | Example 34 | Example 35 | Example 36 | Example 37 |
| Time/h | 8 | 9 | 11 | 12 |
Comparative example:
comparative example 1 is different from example 1 in that the recycled aggregate was not subjected to modification treatment;
the comparative example 2 is different from the example 1 in that the recycled aggregate is not subjected to the soaking treatment of the reinforcing agent, i.e., the step 2 is not included in the preparation process of the modified recycled aggregate;
comparative example 3 is different from example 1 in that the recycled aggregate was not subjected to the soaking treatment with the hydrophobizing agent, i.e., step 2 was not included in the process for preparing the modified recycled aggregate;
comparative example 4 differs from example 1 in that the reinforcing agent does not include a reinforcing filler;
comparative example 5 differs from example 1 in that the hydrophobizing agent does not comprise polyhydroxyethyl methacrylate;
comparative example 6 differs from example 1 in that silica sol is not included in the water repellent agent;
comparative example 7 differs from example 1 in that in step a, ordinary portland cement, coarse aggregate, polyvinyl alcohol, rubber powder, an active admixture, reinforcing fibers, a polycarboxylic acid water reducing agent, and water are mixed uniformly in proportion to prepare a recycled concrete mixture;
comparative example 8 is different from comparative example 7 in that the recycled aggregate was not subjected to the modification treatment.
1) The concrete mixtures obtained in examples 1 to 5 and comparative examples 1 to 8 were subjected to standard block production according to GB/T50080-2002 "method for testing Properties of general concrete mixture", and compressive strength of the standard block cured for 28d was measured and recorded at a loading speed of 0.5MPa/s using a TYE-3000 computer full-automatic concrete press, as shown in the following table, and recorded as Table 1.
2) The concrete mixtures prepared in examples 1-5 and comparative examples 1-8 were prepared into standard test blocks according to GB/T50080-2002 "method for testing the Performance of ordinary concrete mixtures", the prepared standard test blocks were immersed in 30% saline water for 7 days after curing for 28 days, and then taken out and wiped to dry the surface moisture of the standard test blocks, and the compressive strength of the standard test blocks after curing for 28d after immersion was measured by a TYE-3000 computer full-automatic concrete press at a loading rate of 0.5MPa/s and recorded, as shown in the following table, which is denoted as Table 1.
| Detecting items | Compressive strength/Mpa | Compressive strength after water absorption/Mpa |
| Example 1 | 52.7 | 52.3 |
| Example 2 | 52.3 | 51.7 |
| Example 3 | 52.5 | 52 |
| Example 4 | 52.9 | 52.6 |
| Example 5 | 54.1 | 54 |
| Comparative example 1 | 37.6 | 34.8 |
| Comparative example 2 | 41.6 | 39.3 |
| Comparative example 3 | 43.8 | 41.9 |
| Comparative example 4 | 43.2 | 41.22 |
| Comparative example 5 | 49.4 | 48 |
| Comparative example 6 | 47.2 | 45.6 |
| Comparative example 7 | 39.7 | 37.2 |
| Comparative example 8 | 30.5 | 26.7 |
As can be seen from Table 1: it can be seen from the comparison between example 1 and comparative examples 1 to 8 that the strength and compactness of the recycled concrete can be improved and the water absorption of the concrete can be reduced by immersing the recycled aggregate in the fortifier and the hydrophobing agent, modifying the recycled aggregate, and performing the shell-building effect on the natural coarse aggregate and the recycled coarse aggregate respectively by utilizing the change of the feeding amount and the feeding sequence.
3) The regenerated aggregates obtained in examples 1, 10 to 21, 30 to 37 and 1 to 6 were subjected to water absorption test of coarse aggregates according to JTGE42-2005 "road engineering aggregate test Specification", and the test data are shown in the following table and are shown in Table 2.
| Detecting items | Water absorption rate |
| Example 1 | 1.41％ |
| Average of test data for examples 10 to 13 | 1.43％ |
| Average of test data for examples 14 to 17 | 1.42％ |
| Average of test data for examples 17 to 21 | 1.40％ |
| Average of test data for examples 30 to 33 | 1.39％ |
| Average of test data for examples 34 to 37 | 1.4％ |
| Comparative example 1 | 7.13％ |
| Comparative example 2 | 6.93％ |
| Comparative example 3 | 7.01％ |
| Comparative example 4 | 5.4％ |
| Comparative example 5 | 6.86％ |
| Comparative example 6 | 6.40％ |
From the above table, it can be seen that: as can be seen from comparison between example 1 and comparative examples 1 to 6, the recycled aggregate is immersed in the reinforcing agent and the hydrophobizing agent to modify the recycled aggregate, so that the water absorption rate of the recycled aggregate can be effectively reduced, thereby imparting good strength to recycled concrete.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (8)
1. A sidewalk, characterized by: the concrete comprises high-strength concrete bricks, M10 cement mortar, a C20 concrete cushion layer, a broken stone cushion layer and pond residues from top to bottom;
the high-strength concrete brick is prepared from the following raw materials in parts by weight:
the coarse aggregate comprises 20-40% of natural macadam and 60-80% of modified recycled aggregate.
2. A walkway as defined in claim 1, wherein: the modified recycled aggregate is prepared by the following process steps:
step 1: selecting, crushing and screening the waste concrete to prepare recycled aggregate;
step 2: soaking the recycled aggregate prepared in the step 1 in a reinforcing agent for 8-12h, fishing out the recycled aggregate and drying to obtain the reinforced aggregate;
and step 3: and (3) soaking the reinforced aggregate prepared in the step (2) in a reinforcing agent for 8-12h, and then fishing out the reinforced aggregate and drying to obtain the modified recycled aggregate.
3. A walkway as claimed in claim 2, wherein: the enhancer comprises the following raw materials in percentage by weight:
4. a walkway as claimed in claim 3, wherein: the reinforcing filler comprises the following raw materials in percentage by weight:
20-40% of graphene oxide;
30-40% of magnesium-aluminum hydrotalcite;
30-40% of nano calcium carbonate.
5. A walkway as claimed in claim 2, wherein: the hydrophobic coating comprises the following raw materials in percentage by weight:
6. a walkway as defined in claim 1, wherein: the reinforced fiber comprises the following raw materials in percentage by weight:
7. a walkway as defined in claim 1, wherein: the active admixture comprises the following raw materials in percentage by weight:
50-60% of fly ash;
20-30% of granulated blast furnace slag powder;
10-30% of superfine silicon powder.
8. A construction process of a sidewalk is characterized by comprising the following steps: the construction process comprises the following steps:
1) preparing a high-strength concrete brick:
A. stirring natural coarse aggregate and 70% of water in the raw materials for 20-30s according to a proportion, adding ordinary portland cement, polyvinyl alcohol, rubber powder, reinforcing fiber and an active admixture according to a proportion, stirring for 20-30s, adding a polycarboxylic acid water reducing agent and the rest water in the raw materials, stirring for 20-30s, adding modified recycled aggregate, and stirring for 100-150s to prepare a recycled concrete mixture;
B. b, laying the recycled concrete mixture prepared in the step A in a mould, performing vibration extrusion forming, demolding, and curing to obtain a high-strength concrete brick;
2) and (3) paving pond residues with the thickness of not less than 30cm on the plain soil compacted soil foundation, compacting, then paving a 10cm broken stone cushion layer, a 10cm thick C20 concrete cushion layer, 4cm M10 cement mortar and 6cm high-strength concrete bricks in sequence, and obtaining the sidewalk after paving.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010053613.7A CN111170696B (en) | 2020-01-17 | 2020-01-17 | Sidewalk and construction process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010053613.7A CN111170696B (en) | 2020-01-17 | 2020-01-17 | Sidewalk and construction process thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111170696A true CN111170696A (en) | 2020-05-19 |
| CN111170696B CN111170696B (en) | 2021-09-24 |
Family
ID=70654689
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010053613.7A Active CN111170696B (en) | 2020-01-17 | 2020-01-17 | Sidewalk and construction process thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111170696B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111926647A (en) * | 2020-08-31 | 2020-11-13 | 张炜炯 | Rapid repairing method for concrete slab staggering of road |
| CN112811866A (en) * | 2021-01-15 | 2021-05-18 | 深圳市宝金华混凝土有限公司 | Recycled aggregate concrete and preparation method thereof |
| CN113061014A (en) * | 2021-04-09 | 2021-07-02 | 上饶广天建筑构件有限公司 | High-stone-powder stone-chip concrete for pouring sound-insulation floor slab and preparation method thereof |
| CN113860805A (en) * | 2021-10-11 | 2021-12-31 | 柳州北皓建材有限公司 | Green pervious concrete and preparation method thereof |
| CN115259810A (en) * | 2022-08-18 | 2022-11-01 | 杭州三中新型建材科技有限公司 | Environment-friendly concrete and preparation method thereof |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03232783A (en) * | 1990-02-07 | 1991-10-16 | Yasuhiro Hachiman | Production of water-permeable paving block and water-permeable paving block |
| CN105926400A (en) * | 2016-04-30 | 2016-09-07 | 山西省交通科学研究院 | Green low-carbon environment-friendly asphalt pavement structure |
| CN108821672A (en) * | 2018-07-20 | 2018-11-16 | 北京欧美中科学技术研究院 | A method of utilizing graphene oxide intensifying regenerating concrete |
| CN109250939A (en) * | 2018-10-22 | 2019-01-22 | 肥西县创玺建材科技有限公司 | A kind of regeneration method of waste and old concrete |
| CN109279843A (en) * | 2018-12-08 | 2019-01-29 | 曙光装配式建筑科技（浙江）有限公司 | A kind of environmental friendly regenerated concrete and preparation method thereof |
| CN110256025A (en) * | 2019-06-25 | 2019-09-20 | 绍兴上虞南方普银混凝土有限公司 | Its regeneration concrete of a kind of preparation process of Aggregate of recycled concrete and application |
| CN110482936A (en) * | 2019-09-21 | 2019-11-22 | 浙江越达交通工程有限公司 | A kind of pervious concrete and its preparation process of recycled aggregate preparation |
| CN110526610A (en) * | 2019-08-13 | 2019-12-03 | 温州市三箭混凝土有限公司 | A kind of High Strength Regenerated Concrete and preparation method thereof |
-
2020
- 2020-01-17 CN CN202010053613.7A patent/CN111170696B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03232783A (en) * | 1990-02-07 | 1991-10-16 | Yasuhiro Hachiman | Production of water-permeable paving block and water-permeable paving block |
| CN105926400A (en) * | 2016-04-30 | 2016-09-07 | 山西省交通科学研究院 | Green low-carbon environment-friendly asphalt pavement structure |
| CN108821672A (en) * | 2018-07-20 | 2018-11-16 | 北京欧美中科学技术研究院 | A method of utilizing graphene oxide intensifying regenerating concrete |
| CN109250939A (en) * | 2018-10-22 | 2019-01-22 | 肥西县创玺建材科技有限公司 | A kind of regeneration method of waste and old concrete |
| CN109279843A (en) * | 2018-12-08 | 2019-01-29 | 曙光装配式建筑科技（浙江）有限公司 | A kind of environmental friendly regenerated concrete and preparation method thereof |
| CN110256025A (en) * | 2019-06-25 | 2019-09-20 | 绍兴上虞南方普银混凝土有限公司 | Its regeneration concrete of a kind of preparation process of Aggregate of recycled concrete and application |
| CN110526610A (en) * | 2019-08-13 | 2019-12-03 | 温州市三箭混凝土有限公司 | A kind of High Strength Regenerated Concrete and preparation method thereof |
| CN110482936A (en) * | 2019-09-21 | 2019-11-22 | 浙江越达交通工程有限公司 | A kind of pervious concrete and its preparation process of recycled aggregate preparation |
Non-Patent Citations (2)
| Title |
|---|
| 中国兵器工业集团第二一○研究所编: "《先进材料领域科技发展报告》", 30 April 2018, 国防工业出版社 * |
| 刘博著: "《煤/水滑石矿物复合材料的制备及其性能研究》", 30 September 2018, 中国矿业大学出版社 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111926647A (en) * | 2020-08-31 | 2020-11-13 | 张炜炯 | Rapid repairing method for concrete slab staggering of road |
| CN112811866A (en) * | 2021-01-15 | 2021-05-18 | 深圳市宝金华混凝土有限公司 | Recycled aggregate concrete and preparation method thereof |
| CN113061014A (en) * | 2021-04-09 | 2021-07-02 | 上饶广天建筑构件有限公司 | High-stone-powder stone-chip concrete for pouring sound-insulation floor slab and preparation method thereof |
| CN113860805A (en) * | 2021-10-11 | 2021-12-31 | 柳州北皓建材有限公司 | Green pervious concrete and preparation method thereof |
| CN113860805B (en) * | 2021-10-11 | 2022-08-09 | 柳州北皓建材有限公司 | Green pervious concrete and preparation method thereof |
| CN115259810A (en) * | 2022-08-18 | 2022-11-01 | 杭州三中新型建材科技有限公司 | Environment-friendly concrete and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111170696B (en) | 2021-09-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111170696B (en) | Sidewalk and construction process thereof | |
| CN110540389B (en) | High-performance recycled concrete and preparation process thereof | |
| CN111218877B (en) | Driving road and construction process thereof | |
| CN100335436C (en) | Surface modifier for regenerated coarse aggregate | |
| KR101057132B1 (en) | Eco organic inorganic hybrid repair mortar composition and repair method of construction using the same | |
| CN110256025A (en) | Its regeneration concrete of a kind of preparation process of Aggregate of recycled concrete and application | |
| CN110627439B (en) | Ultra-high performance concrete for expansion joint transition area and preparation method thereof | |
| CN110683809A (en) | Graphene oxide anti-erosion and anti-abrasion ultra-high-toughness concrete and preparation method and application thereof | |
| WO2019177193A1 (en) | Method for manufacturing polymer concrete by using construction waste and industrial waste, and polymer concrete manufactured by method | |
| CN107602016A (en) | A kind of modified rubber concrete and preparation method thereof | |
| KR101352937B1 (en) | A high early strength concrete composition using the eco-friendly cycling silica sand and repairing method of concrete pavement using the same | |
| CN111978055A (en) | Recycled concrete with excellent impermeability and preparation method thereof | |
| CN112430044A (en) | Chlorine ion erosion resistant permeable recycled concrete and preparation method thereof | |
| CN113072336A (en) | Rubber recycled concrete and preparation method thereof | |
| CN113912348B (en) | High-performance recycled concrete and preparation method thereof | |
| CN108585576B (en) | Phosphogypsum curing agent | |
| CN110655356A (en) | Recycled concrete and preparation method thereof | |
| CN113860806A (en) | Semi-flexible asphalt pavement material filled with fly ash-based polymer and preparation method thereof | |
| CN110606702A (en) | Bridge self-repairing paving method based on cement-based composite material | |
| CN108033717B (en) | Recycled concrete mixture and preparation method and application thereof | |
| CN112047695A (en) | Municipal RPC curb material and preparation method thereof | |
| CN111960755A (en) | Fine concrete with dredged sand as main raw material and preparation method thereof | |
| CN115159943A (en) | Fireproof light heat-insulating material and preparation method and application thereof | |
| TWI410392B (en) | Construction materials containing hydrophobic pulverulence | |
| CN113321473A (en) | Polypropylene fiber foam light soil based on waste tire rubber powder and preparation method and application thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |