CN113277803A - Fiber seawater sea sand recycled concrete and preparation method thereof - Google Patents
Fiber seawater sea sand recycled concrete and preparation method thereof Download PDFInfo
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- CN113277803A CN113277803A CN202110586291.7A CN202110586291A CN113277803A CN 113277803 A CN113277803 A CN 113277803A CN 202110586291 A CN202110586291 A CN 202110586291A CN 113277803 A CN113277803 A CN 113277803A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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Abstract
The invention provides fiber seawater and sea sand recycled concrete which comprises the following components in percentage by weight: 92-99% of seawater sea sand recycled concrete; 1 to 8 percent of fiber. The invention further provides a preparation method of the fiber seawater sea sand recycled concrete. The fiber seawater and sea sand recycled concrete and the preparation method thereof provided by the invention not only realize resource utilization of recycled aggregate and seawater and sea sand, but also have strong practicability, high operability of the implementation method and considerable environmental benefits and social benefits.
Description
Technical Field
The invention belongs to the technical field of building materials, relates to fiber seawater and sea sand recycled concrete and a preparation method thereof, and particularly relates to a concrete material prepared from seawater and sea sand, recycled aggregate and fibers and a preparation method thereof.
Background
In China, the construction industry is one of the prop industries of national economy, and a large amount of natural aggregate is consumed while the construction industry is rapidly developed. The worldwide annual consumption of natural aggregates is estimated to be between 100 and 110 million tons, of which about 80 million tons per year are used for the manufacture of concrete. Taking river sand as an example, natural river sand resources have been over-mined to meet the concrete production, resulting in a change in the form of the river bed in the natural environment. In order to effectively solve the problems of natural aggregate shortage and massive urban solid waste accumulation, the recycled aggregate is prepared by crushing, washing, screening and grading the building and industrial solid waste and is used for partially or completely replacing the natural aggregate to prepare concrete. However, impurities attached to the surface of recycled aggregate, including old cement mortar and the like, cause the performance of the recycled aggregate to be reduced, so that the water absorption rate of concrete is increased, cracks are more easily generated, and the mechanical property and the durability of the recycled concrete are not as good as those of common concrete.
In recent years, the use of sea sand and seawater in the concrete industry has received increasing attention and research. Dredged sea sand consisting of fine aggregate has great potential and possibility as a substitute for river sand. Meanwhile, the seawater is used for replacing fresh water, so that the problem of fresh water shortage can be relieved. More importantly, for coastal construction projects, high transportation cost can be saved. However, since the main components of seawater and sea sand are chloride salts such as sodium chloride, calcium chloride and magnesium chloride, the setting time of concrete is shortened, the concrete is early set, and the construction time of concrete is seriously shortened. In addition, complex salts or other impurities brought by sea sand and seawater can be adsorbed on the surface of the concrete admixture, so that the admixture cannot fully play a role, and the working performance of fresh concrete is unstable. After sea sand and salt in seawater are crystallized and expanded, concrete can be cracked, so that the cracking resistance and durability of seawater and sea sand concrete are poor, and long-term operation of concrete is not facilitated.
Disclosure of Invention
In view of the limitations of the prior art, the present invention aims to provide a fiber seawater sea sand recycled concrete and a preparation method thereof, which can realize resource utilization of recycled aggregate and seawater sea sand, and have strong practicability, high operability of the implementation method, and considerable environmental benefits and social benefits.
In order to achieve the above objects and other related objects, a first aspect of the present invention provides a fiber seawater sea sand recycled concrete, which comprises the following components by weight:
92-99% of seawater sea sand recycled concrete;
1 to 8 percent of fiber.
Preferably, the fiber seawater and sea sand recycled concrete comprises the following components in percentage by weight:
95-98% of seawater sea sand recycled concrete;
2-5% of fiber.
Preferably, the seawater and sea sand recycled concrete comprises the following components in percentage by weight:
15-25% of cement;
6-12% of seawater;
20-35% of sea sand;
40-50% of recycled coarse aggregate;
0.1 to 5 percent of regenerated micro powder;
0.05 to 0.25 percent of water reducing agent;
0.001 to 0.1 percent of retarder;
0.001 to 0.1 percent of air entraining agent;
0.001 to 0.1 percent of sacrificial agent;
0.1 to 0.5 percent of antifreeze.
More preferably, the seawater and sea sand recycled concrete comprises the following components in percentage by weight:
15-20% of cement;
8-10% of seawater;
20-30% of sea sand;
45-50% of regenerated coarse aggregate;
1-5% of regenerated micro powder;
0.1 to 0.2 percent of water reducing agent;
0.01 to 0.02 percent of retarder;
0.01 to 0.05 percent of air entraining agent;
0.005-0.01% of sacrificial agent;
0.2 to 0.25 percent of antifreeze.
More preferably, the cement is selected from any one of portland cement and ordinary portland cement. The ordinary portland cement is prepared by adding 6-20% of mixed material and a proper amount of gypsum into portland cement clinker and grinding.
More preferably, the seawater is natural seawater that is filtered to remove impurities.
Further preferably, the filter cartridge used for the filtration has a pore size of 4 to 6 μm, preferably 5 μm. The impurities are particles and micro suspended matters in seawater.
More preferably, the sea sand is natural sea sand that is sieved to remove impurities.
Further preferably, the screen has a screen aperture of 4-6mm, preferably 5 mm. The impurities are large-particle-size stones and shells in the sea sand.
More preferably, the particle size distribution of the sea sand meets the specifications in the specification JGJ 206-.
More preferably, the recycled coarse aggregate is a waste concrete block.
Further preferably, the waste concrete blocks are waste concrete blocks in construction waste, and the construction waste comprises engineering waste, demolition waste and decoration waste.
More preferably, the recycled coarse aggregate has a particle size of 5 to 10 mm.
More preferably, the regenerated micro powder is fine powder obtained by performing multi-stage separation, stage-by-stage crushing and grinding on waste concrete and waste clay bricks to reach a certain fineness. The particle size of the regenerated micro powder is less than or equal to 0.1 mm.
More preferably, the screen allowance of the 0.045mm square hole screen of the regenerated micro powder is less than or equal to 20 percent.
More preferably, the water reducing agent is a polycarboxylic acid water reducing agent. The polycarboxylate superplasticizer is a conventionally used polycarboxylate superplasticizer. For improving the properties of concrete mixtures.
More preferably, the retarder is selected from one or more of polyhydroxy carbohydrates, hydroxycarboxylic acids and salts thereof, and polyhydric alcohols. Can delay the problem of early coagulation of concrete caused by chloride components in seawater and sea sand.
Further preferably, the polyhydroxy carbohydrate is glucose or sucrose.
Further preferably, the hydroxycarboxylic acid is tartaric acid.
More preferably, the salt of the hydroxycarboxylic acid is sodium tartrate or sodium gluconate.
Further preferably, the polyol is glycerol.
More preferably, the air entraining agent is sodium abietate.
More preferably, the sacrificial agent is selected from one of a cationic surfactant or a nonionic surfactant. The sacrificial agent is used for forming competitive adsorption with the doped concrete admixture, the sacrificial agent is firstly adsorbed on the surfaces of complex salts or other impurities with unknown sources brought by sea sand and seawater, and the admixture is prevented from being adsorbed by chemical substances or impurities in the seawater, so that the doped admixture is ensured to normally play a role.
Further preferably, the cationic surfactant is cetyltrimethylammonium chloride.
Further preferably, the nonionic surfactant is a polyoxyethylene ether nonionic surfactant selected from one or a combination of two of fatty alcohol polyoxyethylene ether (AEO) and Alkylphenol Polyoxyethylene Ether (APEO).
More preferably, the antifreeze agent is calcium chloride.
Preferably, the fiber is selected from one of steel fiber, alkali-resistant glass fiber and carbon fiber.
Preferably, the length of the fibers is 10-15 mm.
The invention provides a preparation method of fiber seawater sea sand recycled concrete, which comprises the following steps:
1) taking cement, regenerated micro powder, a sacrificial agent and fiber according to the proportion, and pre-mixing to obtain a pre-mixed material;
2) uniformly stirring and mixing the pre-mixed material, the recycled coarse aggregate, the sea sand and the seawater to obtain a mixture;
3) and adding a retarder, an air entraining agent, a water reducing agent and an antifreezing agent into the mixture, and uniformly stirring and mixing to provide the required fiber seawater and sea sand recycled concrete.
Preferably, in the step 1), the fiber is soaked in the fiber surface treating agent for 5-10min, and then taken out and dried.
More preferably, the fiber surface treatment agent is a silane coupling agent with a mass percentage concentration of 0.5-1%.
Further preferably, the silane coupling agent is vinyltriethoxysilane.
Preferably, in the step 2), the recycled coarse aggregate is prepared by crushing, cleaning and grading the waste concrete blocks, sequentially soaking the waste concrete blocks in a nano silicon dioxide hydrocolloid and a methyl potassium silicate solution, fishing out and drying the waste concrete blocks.
More preferably, the crushing is performed using a jaw crusher.
More preferably, the cleaning is performed by a water wheel sand washer.
More preferably, the classification, i.e. screening, of recycled coarse aggregate with a particle size of 5-10 mm.
More preferably, the nano-silica hydrocolloid contains nano-silica in a concentration of 10-40% by mass. The nano silicon dioxide hydrocolloid is an aqueous solution containing nano silicon dioxide.
More preferably, the soaking time of the regenerated coarse aggregate in the nano silicon dioxide hydrocolloid is more than or equal to 5 days.
More preferably, in the nanosilica hydrocolloid, the nanosilica has a particle diameter to surface area of > 700m2(ii) in terms of/g. Can be stably dispersed in water or other liquid.
More preferably, the potassium methyl silicate solution is an aqueous solution of potassium methyl silicate having a mass concentration of 5 to 15%. The methyl potassium silicate solution can be reacted to form an active substance polymethyl silicic acid to generate waterproof performance, and is used for reducing water absorption and resisting seepage and water.
More preferably, the soaking time of the recycled coarse aggregate in the methyl potassium silicate solution is 12-15 min.
More preferably, the drying is natural drying.
Preferably, in step 1), the pre-mixing time is 140-160s, preferably 150 s.
Preferably, in the step 2), the time for stirring and mixing is 150-220 s.
Preferably, in the step 3), the time for stirring and mixing is 150-220 s.
Preferably, in step 1), 2) or 3), the mixing is carried out in a blender. The blender is a conventionally used blender and is commercially available. Specifically, the mixer is a JJ-5 cement mortar mixer.
Preferably, in the step 1), 2) or 3), the stirring and mixing speed is 140 +/-5 r/min.
As described above, the fiber seawater sea sand recycled concrete and the preparation method thereof provided by the invention can prepare a novel concrete material by taking sea sand and recycled coarse aggregate as aggregates, seawater as mixing water, fibers as reinforcing materials, introducing an additive and the like. Has the following beneficial effects:
(1) according to the fiber seawater sea sand recycled concrete and the preparation method thereof, recycled coarse aggregate is used as concrete coarse aggregate, sea sand is used as concrete fine aggregate, local materials are used, the fiber seawater sea sand recycled concrete is green and environment-friendly, the production cost is reduced, and great economic and environment-friendly benefits are achieved.
(2) According to the fiber seawater sea sand recycled concrete and the preparation method thereof, when the recycled coarse aggregate is prepared, the recycled coarse aggregate is soaked in 10-40% of nano silicon dioxide hydrocolloid for more than 5 days, the nano silicon dioxide can fill the gaps of the recycled aggregate and can react with calcium hydroxide in the recycled aggregate to generate C-S-H gel, so that the microstructure of the concrete is improved, the void ratio is reduced, and the strength is improved.
(3) According to the fiber seawater sea sand recycled concrete and the preparation method thereof, when the recycled coarse aggregate is prepared, the recycled coarse aggregate is soaked in 5-15% by mass of methyl potassium silicate solution for 12-15min and then fished out and naturally dried, so that the water absorption rate of the recycled aggregate can be effectively reduced.
(4) According to the fiber seawater sea sand recycled concrete and the preparation method thereof, the water reducing agent is added, so that the water consumption can be reduced, the cement consumption is reduced, the mixing performance and the fluidity of concrete mixture are improved, fine aggregates and cementing materials are used for filling gaps among aggregates, hollowness is reduced, and the mechanical property of concrete is improved.
(5) According to the fiber seawater sea sand recycled concrete and the preparation method thereof, the air entraining agent is added, tiny, closed and disconnected bubbles are introduced into the concrete, the working performance and the fresh mixing performance of the concrete are improved by utilizing the ball and the floating support effect of the micro bubbles, and meanwhile, the frost resistance and the long-term durability of the concrete are obviously improved.
(6) According to the fiber seawater and sea sand recycled concrete and the preparation method thereof, the chloride in the seawater and the sea sand can shorten the setting time of the concrete, so that the concrete is early set, and the construction time of the concrete is seriously shortened. The addition of the retarder in the formula can prolong the setting time of concrete so as to keep enough construction time.
(7) According to the fiber seawater and sea sand recycled concrete and the preparation method thereof, the sacrificial agent is added, so that competitive adsorption can be formed with the doped concrete admixture, the sacrificial agent is firstly adsorbed on the surfaces of complex salts or other impurities brought by sea sand and sea water, the admixture is prevented from being adsorbed by the salts or the impurities, and the doped admixture is ensured to normally play a role.
(8) According to the fiber seawater and sea sand recycled concrete and the preparation method thereof, the recycled micro powder is used as an auxiliary cementing material, so that the cement consumption can be reduced. The regenerated micro powder is prepared from waste concrete, waste clay bricks and the like through multi-stage separation and step-by-step crushing, and is ground into fine powder with certain fineness. The unhydrated cement particles in the waste concrete and the glass phase, amorphous substances and other materials generated in the process of sintering the clay in the waste clay brick are ground to a certain fineness and then mixed into the concrete to play the filling effect and the activity effect. In addition, the incorporation of the regenerated micropowder can greatly reduce the chloride ion permeability of the concrete sample and improve the pore structure. In addition, the regenerated micro powder can provide more ion adsorption sites due to the larger specific surface area, and the physical curing adsorption capacity to free chlorine ions is increased.
(9) The invention provides fiber seawater sea sand recycled concrete and a preparation method thereof, and fibers are added. The fiber is used in the mixed concrete, and the bridge function of the fiber is utilized, so that the problem of concrete cracking caused by introduction of recycled aggregate and chloride salt crystal expansion can be effectively solved, the problems of durability, crack resistance, corrosion resistance and the like of the concrete are effectively improved, and the long-term working performance of the concrete is improved. The fiber surface treatment agent is used for carrying out surface treatment on the fiber, so that a layer of film can be formed on the surface of the fiber, the interface of the fiber is changed from rigidity to flexibility, the shock resistance is improved, and the wear resistance of the fiber can be enhanced. Meanwhile, the brittleness of the fiber is increased at low temperature, so that the concrete is cracked, the strength is reduced, and the service life is shortened, so that the brittleness problem of the fiber is improved by adding the antifreezing agent, and the service life of the concrete is prolonged.
(10) According to the fiber seawater and sea sand recycled concrete and the preparation method thereof, fibers are mixed with the fine cementing material in the preparation process, so that the damage to the fibers can be effectively reduced. The retarder, the air entraining agent, the water reducing agent and the antifreezing agent are added at last, so that complex salts or other impurities in seawater and sea sand can be prevented from being adsorbed to the admixture first, and the added admixture can be ensured to normally play a role.
(11) The fiber seawater and sea sand recycled concrete and the preparation method thereof provided by the invention can reduce the content of free chloride ions in seawater and sea sand and improve the compactness of a concrete substrate, thereby inhibiting the permeation of chloride ions and reducing the problem of high water absorption of recycled concrete through the treatment of recycled aggregate. The invention not only realizes the resource utilization of the recycled aggregate and the seawater and sea sand, but also has strong practicability, high operability of the implementation method and considerable environmental and social benefits.
Drawings
FIG. 1 is a flow chart showing the preparation of a recycled concrete of fiber sea water and sea sand according to the present invention.
Detailed Description
The present invention is further illustrated below with reference to specific examples, which are intended to be illustrative only and not to limit the scope of the invention.
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Example 1
Preparing a fiber seawater sea sand recycled concrete sample No. 1, which comprises the following components in percentage by weight: 96% of seawater sea sand recycled concrete; 4 percent of fiber. The seawater and sea sand recycled concrete comprises the following components in percentage by weight: 18% of cement; 9% of seawater; 25% of sea sand; 46% of recycled coarse aggregate; 1.6 percent of regenerated micro powder; 0.1 percent of water reducing agent; 0.02% of retarder; 0.02% of air entraining agent; 0.01% of a sacrificial agent; 0.25 percent of antifreezing agent.
Wherein the cement is portland cement with a grade of 42.5R; the seawater is natural seawater which is filtered by a filter with a 5-micron filter element to remove impurities; the sea sand is natural sea sand which is sieved by a 5mm screen to remove impurities, and the particle size distribution of the sea sand meets the specification of JGJ 206-2010; the recycled coarse aggregate is waste concrete blocks with the particle size of 5-10 mm; the regenerated micro powder is micro powder which is obtained by carrying out multi-stage sorting, step-by-step crushing and grinding on waste concrete to reach certain fineness, and the sieve residue of a 0.045mm square-hole sieve is less than or equal to 20 percent; the water reducing agent is a polycarboxylic acid water reducing agent; the retarder is tartaric acid; the air entraining agent is sodium abietate; the sacrificial agent is cationic surfactant cetyl trimethyl ammonium chloride; the antifreezing agent is calcium chloride; the fiber is alkali-resistant glass fiber with the length of 10-15 mm.
Soaking the fiber in 0.7% of vinyltriethoxysilane for 10min, taking out and drying. And then taking the cement, the regenerated micro powder, the sacrificial agent and the fiber according to the proportion, and pre-mixing in a mixer for 150s at the mixing speed of 140r/min to obtain a pre-mixed material. And crushing the waste concrete blocks by using a jaw crusher, cleaning by using a water wheel sand washer, screening and grading to obtain 5-10mm particle size, sequentially soaking in 30% nano silicon dioxide hydrocolloid for 5 days, soaking in 10% methyl potassium silicate solution for 14min, taking out, and naturally drying to prepare the regenerated coarse aggregate. And then, uniformly stirring and mixing the pre-mixed material, the recycled coarse aggregate, the seawater and the sea sand in a stirrer for 180s at the stirring and mixing speed of 140r/min to obtain a mixture. And finally, adding a retarder, an air entraining agent, a water reducing agent and an antifreezing agent, stirring and mixing uniformly in a stirrer for 180s at the stirring and mixing speed of 140r/min to obtain a required seawater and sea sand recycled concrete sample No. 1.
Example 2
Preparing a fiber seawater sea sand recycled concrete sample No. 2, which comprises the following components in percentage by weight: 98% of seawater sea sand recycled concrete; 2 percent of fiber. The seawater and sea sand recycled concrete comprises the following components in percentage by weight: 16% of cement; 8.6 percent of seawater; 26% of sea sand; 46% of recycled coarse aggregate; 3% of regenerated micro powder; 0.1 percent of water reducing agent; 0.02% of retarder; 0.02% of air entraining agent; 0.01% of a sacrificial agent; 0.25 percent of antifreezing agent.
Wherein the cement is portland cement with a grade of 42.5R; the seawater is natural seawater which is filtered by a filter with a 5-micron filter element to remove impurities; the sea sand is natural sea sand which is sieved by a 5mm screen to remove impurities, and the particle size distribution of the sea sand meets the specification of JGJ 206-2010; the recycled coarse aggregate is derived from waste concrete blocks, and the particle size is 5-10 mm; the regenerated micro powder is prepared from waste clay bricks, and is micro powder which is subjected to multi-stage sorting, stage-by-stage crushing and grinding to reach a certain fineness, wherein the sieve residue of a 0.045mm square-hole sieve is less than or equal to 20%; the water reducing agent is a polycarboxylic acid water reducing agent; the retarder is tartaric acid; the air entraining agent is sodium abietate; the sacrificial agent is cationic surfactant cetyl trimethyl ammonium chloride; the antifreezing agent is calcium chloride; the fiber is alkali-resistant glass fiber with the length of 10-15 mm.
Soaking the fiber in 0.8% of vinyltriethoxysilane for 10min, taking out and drying. And then taking the cement, the regenerated micro powder, the sacrificial agent and the fiber according to the proportion, and pre-mixing in a mixer for 150s at the mixing speed of 140r/min to obtain a pre-mixed material. And crushing the waste concrete blocks by using a jaw crusher, cleaning by using a water wheel sand washer, screening and grading to obtain 5-10mm particle size, sequentially soaking in 30% nano silicon dioxide hydrocolloid for 6 days, soaking in 12% methyl potassium silicate solution for 13min, taking out, and naturally drying to prepare the regenerated coarse aggregate. And then, uniformly stirring and mixing the pre-mixed material, the recycled coarse aggregate, the seawater and the sea sand in a stirrer for 200s at the stirring and mixing speed of 140r/min to obtain a mixture. And finally, adding a retarder, an air entraining agent, a water reducing agent and an antifreezing agent, stirring and mixing uniformly in a stirrer for 200s at the stirring and mixing speed of 140r/min to obtain the required fiber seawater and sea sand recycled concrete sample No. 2.
Comparative example 1
A concrete sample 1 was prepared by a conventional method, comprising the following components in weight percent: 16% of cement, 7.7% of water, 26% of sand, 50% of pebbles and 0.3% of water reducing agent.
Wherein the cement is portland cement with a grade of 42.5R; the water is tap water; the sand is machine-made sand and meets the regulation of the quality standard and the inspection method of the sand for common commercial concrete; the stones are crushed stones with the grain diameter of 5-10mm, and meet the quality standard and the inspection method of crushed stones or pebbles for common concrete; the water reducing agent is a polycarboxylic acid water reducing agent.
And (3) putting the raw materials into a stirrer, stirring and mixing the raw materials uniformly for 200s at the stirring and mixing speed of 140r/min to obtain the required concrete sample 1.
Test example 1
The fiber seawater sea sand recycled concrete sample 1# prepared in example 1, the fiber seawater sea sand recycled concrete sample 2# prepared in example 2 and the concrete sample 1 prepared in comparative example 1 were subjected to initial setting time, final setting time, compressive strength, splitting tensile strength and breaking strength tests, respectively. The specific test results are shown in table 1.
TABLE 1
As can be seen from table 1, the fiber seawater sand recycled concrete samples 1# and 2# are better than the concrete sample 1 in each index. The fiber seawater sea sand recycled concrete prepared by the method has good construction performance, reasonable initial and final setting time, no influence on construction, 28d strength reaching the requirement of C30 concrete, obviously improved tensile property and flexural strength and excellent mechanical property.
In conclusion, the fiber seawater and sea sand recycled concrete and the preparation method thereof provided by the invention not only realize resource utilization of recycled aggregate and seawater and sea sand, but also have strong practicability, high operability of the implementation method and considerable environmental benefits and social benefits. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. The fiber seawater sea sand recycled concrete comprises the following components in percentage by weight:
92-99% of seawater sea sand recycled concrete;
1 to 8 percent of fiber.
2. The fiber seawater sand recycled concrete of claim 1, which comprises the following components in percentage by weight:
15-25% of cement;
6-12% of seawater;
20-35% of sea sand;
40-50% of recycled coarse aggregate;
0.1 to 5 percent of regenerated micro powder;
0.05 to 0.25 percent of water reducing agent;
0.001 to 0.1 percent of retarder;
0.001 to 0.1 percent of air entraining agent;
0.001 to 0.1 percent of sacrificial agent;
0.1 to 0.5 percent of antifreeze.
3. A fibre sea water sea sand recycled concrete according to claim 2, comprising any one or more of the following conditions:
A1) the cement is selected from any one of Portland cement or ordinary Portland cement;
A2) the particle size of the recycled coarse aggregate is 5-10 mm;
A3) the screen allowance of the 0.045mm square hole screen of the regenerated micro powder is less than or equal to 20 percent;
A4) the water reducing agent is a polycarboxylic acid water reducing agent;
A5) the retarder is selected from one or more of polyhydroxy carbohydrates, hydroxycarboxylic acids and salts thereof, and polyhydric alcohols;
A6) the air entraining agent is sodium abietate;
A7) the sacrificial agent is selected from one of a cationic surfactant or a nonionic surfactant;
A8) the antifreezing agent is calcium chloride.
4. The fiber seawater sea sand recycled concrete of claim 1, wherein the fiber is selected from one of steel fiber, alkali-resistant glass fiber, and carbon fiber.
5. The method for preparing fiber seawater sea sand recycled concrete according to any one of claims 1 to 4, comprising the following steps:
1) taking cement, regenerated micro powder, a sacrificial agent and fiber according to the proportion, and pre-mixing to obtain a pre-mixed material;
2) uniformly stirring and mixing the pre-mixed material, the recycled coarse aggregate, the sea sand and the seawater to obtain a mixture;
3) and adding a retarder, an air entraining agent, a water reducing agent and an antifreezing agent into the mixture, and uniformly stirring and mixing to provide the required fiber seawater and sea sand recycled concrete.
6. The preparation method of the fiber seawater sea sand recycled concrete according to claim 5, wherein in the step 1), the fiber is soaked in the fiber surface treating agent for 5-10min, and then taken out and dried; the fiber surface treating agent is a silane coupling agent with the mass percentage concentration of 0.5-1%.
7. The method for preparing fiber seawater sea sand recycled concrete according to claim 5, wherein in the step 2), the recycled coarse aggregate is prepared by crushing, cleaning and grading the waste concrete blocks, sequentially soaking the waste concrete blocks in a nano silicon dioxide hydrocolloid and a methyl potassium silicate solution, taking out the waste concrete blocks and drying the waste concrete blocks.
8. The method for preparing fiber seawater sea sand recycled concrete according to claim 7, wherein the nano silica hydrocolloid contains nano silica with a mass percentage concentration of 10-40%; the soaking time of the regenerated coarse aggregate in the nano silicon dioxide hydrocolloid is more than or equal to 5 days.
9. The method for preparing fiber seawater sea sand recycled concrete according to claim 7, wherein the potassium methyl silicate solution is 5-15% by mass of potassium methyl silicate solution; the soaking time of the recycled coarse aggregate in the methyl potassium silicate solution is 12-15 min.
10. The method for preparing the fiber seawater sea sand recycled concrete according to claim 5, further comprising any one or more of the following conditions:
B1) in the step 1), the pre-mixing time is 140-160 s;
B2) in the step 2), the stirring and mixing time is 150-220 s;
B3) in the step 3), the stirring and mixing time is 150-220 s;
B4) in the step 1), 2) or 3), the stirring and mixing speed is 135-145 r/min.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110261048 | 2021-03-10 | ||
| CN2021102610488 | 2021-03-10 |
Publications (1)
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| CN114085093A (en) * | 2021-11-30 | 2022-02-25 | 同济大学 | High-performance sintered brick building block prepared by mixing seawater with waste soil and preparation method thereof |
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