CN114230241A - pH response perlite composite concrete and preparation method thereof - Google Patents
pH response perlite composite concrete and preparation method thereof Download PDFInfo
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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
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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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/14—Minerals of vulcanic origin
- C04B14/18—Perlite
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1055—Coating or impregnating with inorganic materials
- C04B20/107—Acids or salts thereof
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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
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
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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 discloses pH-responsive perlite composite concrete and a preparation method thereof, belonging to the field of building materials. The raw materials for preparing the pH-responsive perlite composite concrete comprise pH-responsive perlite, cement, mineral powder, fine aggregate, coarse aggregate, fly ash and calcium lignosulfonate, and the raw materials for preparing the pH-responsive perlite comprise sodium alginate, methacrylic acid, sodium pyrophosphate, methacrylamide, ammonium persulfate, TEMED, ultrafine calcium carbonate powder and perlite. The pH response perlite composite concrete prepared by the invention can improve the compressive strength and the heat preservation performance of the concrete, prevent the wall body made of perlite concrete from cracking and hollowing easily, and improve the safety of buildings.
Description
Technical Field
The invention relates to the field of building materials, in particular to pH-responsive perlite composite concrete and a preparation method thereof.
Background
With the improvement of the economic level of China and the continuous development of scientific technology, the heat preservation, sound insulation and other functions of buildings in China are continuously improved, the building energy consumption problem is increasingly prominent while the living comfort of residents is met, and the energy consumption of the outer wall accounts for the maximum energy consumption of the building, so that the research and preparation of the heat preservation and energy saving material for the outer wall are provided. The wall heat-insulating energy-saving material in the building market of China is mainly divided into two categories, namely organic and inorganic, and the organic heat-insulating material such as a molded polystyrene board, a phenolic resin board, a polyurethane board and the like has the advantages of small heat conductivity coefficient and good heat-insulating and energy-saving effects, but the organic heat-insulating material is easy to burn and low in fire-proof grade, and if a fire disaster happens, the fire can quickly spread and toxic smoke is generated along with the fire disaster; inorganic heat-insulating materials such as perlite, hollow vitrified micro bubbles, closed-cell perlite, rock wool, mineral wool, glass wool and the like not only have the advantages of low heat conductivity coefficient and good heat-insulating and energy-saving effects, but also are A-grade flame-retardant materials, and have good fire safety performance and aging resistance.
The perlite has the advantages of light weight, high strength, strong fire resistance, high porosity, no toxicity, no harm and the like, so the perlite is widely applied to the field of building heat-insulating and energy-saving materials and is a main heat-insulating aggregate of an inorganic heat-insulating material. The addition of perlite into a cement concrete member can reduce the heat conductivity coefficient of concrete and improve the heat insulation performance, but a wall body made of perlite concrete is easy to crack, on one hand, the flocculent appearance is easy to generate resistance in the process of stirring with mortar, and the workability is poor, on the other hand, the water requirement for preparing the perlite concrete is increased due to the large water absorption of the perlite, the solidification period of the concrete is destroyed, the mechanical property of the dried concrete is greatly reduced, and hollowing and cracking are easily generated. The wall body cracks not only affect the beauty of the wall body and cause reworking to delay the construction period, but also seriously affect the building safety and cause the failure of quality inspection. Therefore, it is necessary to develop a novel perlite composite concrete material, which can not only improve the compressive strength and the thermal insulation performance when applied to the external wall of a building, but also prevent the thermal insulation wall made of perlite concrete from cracking and hollowing, and improve the safety of the building.
Disclosure of Invention
In view of the above, the invention aims to provide a pH-responsive perlite composite concrete and a preparation method thereof, which solve the problem that a thermal insulation wall prepared from perlite concrete is easy to crack, improve the safety of a building, and also improve the compressive strength and the thermal insulation performance of the wall.
The invention solves the technical problems through the following technical scheme:
the pH response perlite composite concrete comprises the following raw materials: pH response perlite, cement, mineral powder, fine aggregate, coarse aggregate, fly ash and calcium lignosulfonate.
Further, the raw materials comprise the following components in parts by weight: 48-67 parts of pH response perlite, 25-28 parts of cement, 50-60 parts of mineral powder, 70-80 parts of fine aggregate, 43-52 parts of coarse aggregate, 50-60 parts of fly ash and 2.2-2.6 parts of calcium lignosulfonate.
The invention also discloses a preparation method of the pH response perlite composite concrete, which comprises the following specific steps:
1) preparing mortar: adding water, fine aggregate and coarse aggregate into a container, uniformly stirring to form a pre-mixture, adding mineral powder and fly ash into the pre-mixture, and uniformly stirring to obtain mortar;
2) preparing concrete: and mixing the mortar, cement and calcium lignosulfonate, uniformly stirring, adding the pH response perlite, and uniformly stirring again to obtain the pH response perlite composite concrete.
Further, the preparation of the pH response perlite comprises the following raw materials in parts by weight: 10-15 parts of sodium alginate, 4-6 parts of methacrylic acid, 1-2 parts of sodium pyrophosphate, 4-6 parts of methacrylamide, 0.4-0.6 part of ammonium persulfate, 0.4-0.6 part of TEMED, 1.5-2.5 parts of superfine calcium carbonate powder and 30-40 parts of perlite.
Further, the preparation process of the pH response perlite is as follows:
A. perlite treatment: calcining the perlite at the temperature of 850-1000 ℃ for 0.8-1h, spraying 0.9-2kg of triethoxysilane to the perlite when the temperature of the perlite is reduced to 100-120 ℃, and cooling to room temperature;
B. methacrylic acid treatment: mixing methacrylic acid and deionized water according to the mass ratio of 1: 25, introducing nitrogen with the flow rate of 2L/min for 10min after dissolution, and then adding methacrylamide with the same mass as methacrylic acid and uniformly stirring for later use;
C. and (3) sodium alginate treatment: sodium alginate and deionized water are mixed according to the mass ratio of 1: 20, stirring uniformly, adding sodium pyrophosphate, and stirring at 60-70 ℃ for 40-60min for later use;
D. preparation of pH response perlite: mixing the treated perlite with the treated methacrylic acid, the treated sodium alginate, ammonium persulfate, TEMED and superfine calcium carbonate powder, stirring uniformly, then performing vacuum treatment, taking out, and irradiating for 10-20min under ultraviolet rays to obtain the pH response perlite.
Further, the time of introducing nitrogen in the methacrylic acid treatment step is 10-20min, and the flow rate of introducing nitrogen is 2L/min.
Further, the vacuum treatment in the step of preparing the pH response perlite is specifically operated as follows: adding the processed perlite and the processed methacrylic acid into a vacuum cylinder, adjusting the vacuum degree to 0.05-0.1MPa, and carrying out vacuum treatment for 3-4 h.
Further, in the mortar preparation step, the total mass ratio of water to cement, fly ash and mineral powder is 1: (2-2.5).
Further, in the mortar preparation step, the fine aggregate is machine-made sand with the particle size of less than 3mm, and the coarse aggregate is cobble macadam with the particle size of 5-10 mm.
The method is characterized in that the perlite is calcined at high temperature to enlarge the pores of the perlite, raw materials such as the processed methacrylic acid and the processed sodium alginate can conveniently enter an inner cavity structure of the perlite to form composite gel to modify the perlite, the perlite is cooled to a certain temperature after being calcined at high temperature, and triethoxysilane is sprayed on the perlite to modify the pores and the surface inside the perlite, so that the perlite can be more easily compounded with the gel and cannot fall off.
Sodium pyrophosphate capable of improving flocculation effect is uniformly mixed in a sodium alginate raw material, and can act on sodium alginate and treated methacrylic acid together with ammonium persulfate, TEMED and superfine calcium carbonate powder to promote the formation of pH response composite gel. The pH response composite gel is combined with the interior or the surface of the perlite in the forming process, and finally the surface of the gel can be hardened by ultraviolet irradiation, so that the prepared pH response perlite can be more easily and uniformly dispersed in the concrete.
The pH response composite gel is wrapped inside and on the surface of the pores of the pH response perlite, so that the fluffy appearance of the perlite is changed to weaken the resistance of the perlite and mortar in the stirring process, the workability is improved, the perlite and the concrete are highly and durably and tightly combined, when the concrete is solidified, the pH response composite gel inside and outside the pH response perlite slowly expands in the alkaline environment of the concrete, the composite gel can completely fill the pores inside the pH response perlite after the concrete is dried, the water absorption of the perlite is reduced, the water requirement for preparing the perlite concrete is reduced, the water absorbed by the concrete in the later period from the air is reduced, and gaps and hollows caused by the evaporation of the water after the perlite concrete is dried can be prevented.
Compared with the prior art, the invention has the beneficial effects that:
the pH-responsive perlite composite concrete prepared by the invention can improve the compressive strength and the thermal insulation performance when being applied to an exterior wall building, and meanwhile, when being applied to the exterior wall building, the pH-responsive perlite composite concrete prepared by the invention can prevent the wall body made of perlite concrete from cracking and hollowing easily, improve the stability and the safety of the building, avoid the delay of the construction period due to reworking and improve the durability of the building.
Detailed Description
The present invention will be described in detail with reference to specific examples below:
example 1:
in order to prepare the pH response perlite composite concrete, the pH response perlite needs to be prepared firstly, and the following raw materials by weight are weighed: 10kg of sodium alginate, 4kg of methacrylic acid, 1kg of sodium pyrophosphate, 4kg of methacrylamide, 0.4kg of ammonium persulfate, 0.4kg of TEMED, 1.5kg of superfine calcium carbonate powder and 30kg of perlite.
The preparation process of the pH response perlite comprises the following steps:
A. perlite treatment: calcining the perlite at 850 ℃ for 0.8h, spraying 0.9kg of triethoxysilane to the perlite when the temperature of the perlite is reduced to 100 ℃, and cooling to room temperature;
B. methacrylic acid treatment: mixing methacrylic acid and deionized water according to the mass ratio of 1: 25, introducing nitrogen with the flow rate of 2L/min for 10min after dissolution, and then adding methacrylamide with the same mass as methacrylic acid and uniformly stirring for later use;
C. and (3) sodium alginate treatment: sodium alginate and deionized water are mixed according to the mass ratio of 1: 20, stirring uniformly, adding sodium pyrophosphate, and stirring at 60 ℃ for 40min for later use;
D. preparation of pH response perlite: mixing the treated perlite with the treated methacrylic acid, the treated sodium alginate, ammonium persulfate, TEMED and superfine calcium carbonate powder, stirring uniformly, adding into a vacuum cylinder, adjusting the vacuum degree to 0.05MPa by using a vacuum pump, carrying out vacuum treatment for 3h, taking out, and irradiating for 10min under ultraviolet rays with the wavelength of 300nm to obtain the pH response perlite.
The prepared pH response perlite can be used for preparing pH response perlite composite concrete, and if the quality of the prepared pH response perlite needs to be increased, the raw materials are increased in proportion.
Weighing the raw materials of the pH response perlite composite concrete: 240kgpH response perlite, 125kg cement, 250kg mineral powder, 250kg water, 350kg fine aggregate, 215kg coarse aggregate, 250kg fly ash and 11kg calcium lignosulfonate, wherein the fine aggregate is machine-made sand with the particle size of less than 3mm, and the coarse aggregate is cobble crushed stone with the particle size of 5-10 mm.
The concrete is prepared by the following steps:
1) preparing mortar: respectively sieving the coarse aggregate and the fine aggregate for use, adding water, the sieved fine aggregate and the coarse aggregate into a container, uniformly stirring to form a pre-mixture, adding mineral powder and fly ash into the pre-mixture, and uniformly stirring to obtain mortar;
2) preparing concrete: and mixing the mortar, cement and calcium lignosulfonate, uniformly stirring, adding the pH response perlite, and uniformly stirring again to obtain the pH response perlite composite concrete.
Example 2:
in order to prepare the pH response perlite composite concrete, the pH response perlite needs to be prepared firstly, and the following raw materials by mass are weighed: 12.5kg of sodium alginate, 5kg of methacrylic acid, 1.5kg of sodium pyrophosphate, 5kg of methacrylamide, 0.5kg of ammonium persulfate, 0.5kg of TEMED, 2kg of superfine calcium carbonate powder and 35kg of perlite.
The preparation process of the pH response perlite comprises the following steps:
A. perlite treatment: calcining the perlite at 925 ℃ for 0.9h, spraying 1.4kg of triethoxysilane to the perlite when the temperature of the perlite is reduced to 110 ℃, and cooling to room temperature;
B. methacrylic acid treatment: mixing methacrylic acid and deionized water according to the mass ratio of 1: 25, introducing nitrogen at the flow rate of 2L/min for 15min after dissolution, adding methacrylamide with the same mass as methacrylic acid, and uniformly stirring for later use;
C. and (3) sodium alginate treatment: sodium alginate and deionized water are mixed according to the mass ratio of 1: 20, stirring uniformly, adding sodium pyrophosphate, and stirring at 65 ℃ for 50min for later use;
D. preparation of pH response perlite: mixing the treated perlite with the treated methacrylic acid, the treated sodium alginate, ammonium persulfate, TEMED and superfine calcium carbonate powder, stirring uniformly, adding into a vacuum cylinder, adjusting the vacuum degree to 0.08MPa by using a vacuum pump, carrying out vacuum treatment for 3.5h, taking out, and irradiating for 15min under ultraviolet rays with the wavelength of 300nm to obtain the pH response perlite.
The prepared pH response perlite can be used for preparing pH response perlite composite concrete, and if the quality of the prepared pH response perlite needs to be increased, the raw materials are increased in proportion.
Weighing the raw materials of the pH response perlite composite concrete: 290kg of pH response perlite, 135kg of cement, 275kg of mineral powder, 310kg of water, 375kg of fine aggregate, 240kg of coarse aggregate, 275kg of fly ash and 12kg of calcium lignosulfonate, wherein the fine aggregate is machine-made sand with the particle size of less than 3mm, and the coarse aggregate is cobble crushed stone with the particle size of 5-10 mm.
The procedure for preparing the concrete was the same as in example 1.
Example 3:
in order to prepare the pH response perlite composite concrete, the pH response perlite needs to be prepared firstly, and the following raw materials by mass are weighed: 15kg of sodium alginate, 6kg of methacrylic acid, 2kg of sodium pyrophosphate, 6kg of methacrylamide, 0.6kg of ammonium persulfate, 0.6kg of TEMED, 2.5kg of superfine calcium carbonate powder and 40kg of perlite.
The preparation process of the pH response perlite comprises the following steps:
A. perlite treatment: calcining the perlite at the temperature of 1000 ℃ for 1h, spraying 2kg of triethoxysilane to the perlite when the temperature of the perlite is reduced to 120 ℃, and cooling to room temperature;
B. methacrylic acid treatment: mixing methacrylic acid and deionized water according to the mass ratio of 1: 25, introducing nitrogen at the flow rate of 2L/min for 20min after dissolution, adding methacrylamide with the same mass as methacrylic acid, and uniformly stirring for later use;
C. and (3) sodium alginate treatment: sodium alginate and deionized water are mixed according to the mass ratio of 1: 20, stirring uniformly, adding sodium pyrophosphate, and stirring at 70 ℃ for 60min for later use;
D. preparation of pH response perlite: mixing the treated perlite with the treated methacrylic acid, the treated sodium alginate, ammonium persulfate, TEMED and superfine calcium carbonate powder, stirring uniformly, adding into a vacuum cylinder, adjusting the vacuum degree to 0.1MPa by using a vacuum pump, carrying out vacuum treatment for 4h, taking out, and irradiating for 20min under ultraviolet rays with the wavelength of 300nm to obtain the pH response perlite.
The prepared pH response perlite can be used for preparing pH response perlite composite concrete, and if the quality of the prepared pH response perlite needs to be increased, the raw materials are increased in proportion.
Weighing the raw materials of the pH response perlite composite concrete: 335kgpH response perlite, 140kg cement, 300kg mineral powder, 370kg water, 400kg fine aggregate, 260kg coarse aggregate, 300kg fly ash and 13kg calcium lignosulfonate, wherein the fine aggregate is machine-made sand with the particle size of less than 3mm, and the coarse aggregate is cobble crushed stone with the particle size of 5-10 mm.
The procedure for preparing the concrete was the same as in example 2.
Comparative example 1:
the concrete of comparative example 1 is compared with the concrete of example 3, and the main difference is that the perlite treatment step in comparative example 1 is not treated with methacrylic acid, and the modified perlite used in the comparative example has the following specific preparation method and raw material ratio:
weighing the following raw materials: 15kg of sodium alginate, 2kg of sodium pyrophosphate, 2.5kg of superfine calcium carbonate powder and 40kg of perlite.
The preparation process comprises the following steps:
A. perlite treatment: calcining the perlite at the temperature of 1000 ℃ for 1h, spraying 2kg of triethoxysilane to the perlite when the temperature of the perlite is reduced to 120 ℃, and cooling to room temperature;
B. and (3) sodium alginate treatment: sodium alginate and deionized water are mixed according to the mass ratio of 1: 20, stirring uniformly, adding sodium pyrophosphate, and stirring at 70 ℃ for 60min for later use;
C. preparing the sodium alginate gel composite perlite: mixing the treated perlite-treated sodium alginate and superfine calcium carbonate powder, stirring, adding into a vacuum cylinder, adjusting vacuum degree to 0.1MPa, vacuum-treating for 4h, taking out, and irradiating under ultraviolet ray with wavelength of 300nm for 20min to obtain modified perlite.
The prepared modified perlite can be used for preparing perlite composite concrete, and if the quality of the prepared perlite needs to be increased, the raw materials are increased in proportion.
Other raw materials and the quality of the raw materials for preparing concrete were the same as in example 3, and the procedure for preparing concrete was the same as in example 3.
Comparative example 2:
the concrete of comparative example 2 is compared with the concrete of example 3, and the main difference is that the perlite treatment step in comparative example 2 is not treated with sodium alginate, and the concrete preparation method and the raw material ratio of the modified perlite used in comparative example 2 are as follows:
weighing the following raw materials: 6kg of methacrylic acid, 6kg of methacrylamide, 0.6kg of ammonium persulfate, 0.6kg of TEMED and 40kg of perlite.
The preparation process comprises the following steps:
A. perlite treatment: calcining the perlite at the temperature of 1000 ℃ for 1h, spraying 2kg of triethoxysilane to the perlite when the temperature of the perlite is reduced to 120 ℃, and cooling to room temperature;
B. methacrylic acid treatment: mixing methacrylic acid and deionized water according to the mass ratio of 1: 25, introducing nitrogen at the flow rate of 2L/min for 30min after dissolution, adding methacrylamide with the same mass as methacrylic acid, and uniformly stirring for later use;
C. preparing methacrylic acid gel composite perlite: mixing the treated perlite with the treated methacrylic acid, ammonium persulfate and TEMED, stirring uniformly, adding into a vacuum cylinder, adjusting the vacuum degree to 0.1MPa, vacuum-treating for 4h, taking out, and irradiating for 20min under the ultraviolet ray with the wavelength of 300nm to obtain the modified perlite.
Other raw materials and the quality of the raw materials for preparing the concrete were the same as those of example 3, and the procedure for preparing the concrete was the same as that of example 3.
Comparative example 3:
comparative example 3 in contrast to example 3, which differs primarily in that the perlite treatment step of comparative example 3 is free of a methacrylic acid treatment step and a sodium alginate treatment step, the modified perlite used in comparative example 3 was prepared as follows:
perlite treatment: calcining the perlite at the temperature of 1000 ℃ for 1h, spraying 2kg of triethoxysilane to the perlite when the temperature of the perlite is reduced to 120 ℃, and cooling to room temperature;
other raw materials and the quality of the raw materials for preparing the concrete were the same as those of example 3, and the procedure for preparing the concrete was the same as that of example 3.
Comparative example 4:
the concrete of comparative example 4 is compared with the concrete of example 3, and the difference is mainly that perlite is not used in comparative example 4, the prepared concrete is ordinary concrete, the raw materials comprise cement, mineral powder, fine aggregate, coarse aggregate, fly ash and calcium lignosulfonate, the mass of each raw material is the same as that of example 3, mortar is prepared according to the steps of example 3, and then the rest raw materials are added and uniformly stirred to prepare the ordinary concrete.
The performance of the concrete prepared in the embodiments 1-3 and the comparative examples 1-4 is detected, the thermal conductivity and the compressive strength of the concrete are tested according to the method specified by GBT50081-2019, in addition, the concrete prepared in the embodiments 1-3 and the comparative examples 1-4 is respectively poured in a die of 100 cm x 24 cm to prepare 3 square samples, the crack number of the sample with the width of more than 1mm, the depth of more than 2cm and the length of more than 2cm is tested by adopting an ultrasonic flaw detection technology at 24 months, and the average value of the crack number of the three samples is taken.
The data obtained are shown in table 1:
TABLE 1
And (3) analyzing experimental data:
(1) compared with the common concrete prepared in the comparative example 4, the concrete prepared in the examples 1 to 3 and the comparative examples 1 to 3 has lower heat conductivity coefficient and higher compressive strength, which shows that the heat insulation performance and the compressive strength of the concrete can be improved after the perlite is adopted.
(2) Compared with the comparative examples 1 to 3, the thermal conductivity of the examples 1 to 3 is lower than that of the comparative examples 1 to 3, and the compressive strength is higher than that of the comparative examples 1 to 3, which shows that the treatment method of the invention can improve the heat preservation performance and the compressive strength of the perlite concrete, wherein comparative example 1 was not treated with methacrylic acid compared to example 3, comparative example 2 was not treated with sodium alginate compared to example 3, comparative example 3 compared with example 3 without methacrylic acid treatment and sodium alginate treatment, comparative examples 1-3 had inferior heat insulating properties and compressive strength to example 3, therefore, the perlite can be applied to the concrete after the synergistic treatment of the methacrylic acid and the sodium alginate disclosed by the invention, so that the heat insulation performance and the compressive strength of the concrete can be obviously improved, and the purposes of heat insulation, energy conservation and improvement of the stability and the safety of a building are achieved.
(3) The block sample prepared in comparative example 3 has a lower thermal conductivity and a larger number of cracks than the normal concrete block sample prepared in comparative example 4, which indicates that the wall body made of perlite concrete is more heat-insulating than the wall body made of normal concrete, but is easier to crack.
(4) The crack numbers of the examples 1-3 are lower than those of the comparative examples 1-3 in comparison with those of the comparative examples 1-3, and the treatment method of the invention can prevent the wall made of perlite concrete from cracking. Compared with the example 3, the comparative example 1 is not treated by methacrylic acid, the comparative example 2 is not treated by sodium alginate, compared with the example 3, the comparative example 3 is not treated by methacrylic acid and sodium alginate, and compared with the example 3, the comparative examples 1-3 have more cracks than the example 3, so that the perlite can effectively prevent the wall body made of perlite concrete from cracking and improve the safety and the durability of buildings when being applied to the concrete after the synergistic treatment of the methacrylic acid and the sodium alginate disclosed by the invention.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims. The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.
Claims (9)
1. The pH response perlite composite concrete is characterized by comprising the following raw materials: pH response perlite, cement, mineral powder, fine aggregate, coarse aggregate, fly ash and calcium lignosulfonate.
2. The pH-responsive perlite composite concrete as claimed in claim 1, is characterized in that the raw materials in parts by weight are as follows: 48-67 parts of pH response perlite, 25-28 parts of cement, 50-60 parts of mineral powder, 70-80 parts of fine aggregate, 43-52 parts of coarse aggregate, 50-60 parts of fly ash and 2.2-2.6 parts of calcium lignosulfonate.
3. The preparation method of the pH response perlite composite concrete is characterized by comprising the following steps:
1) preparing mortar: adding water, fine aggregate and coarse aggregate into a container, uniformly stirring to form a pre-mixture, adding mineral powder and fly ash into the pre-mixture, and uniformly stirring to obtain mortar;
2) preparing concrete: and mixing the mortar, cement and calcium lignosulfonate, uniformly stirring, adding the pH response perlite, and uniformly stirring again to obtain the pH response perlite composite concrete.
4. The method for preparing the pH-responsive perlite composite concrete as claimed in claim 3, wherein the preparation of the pH-responsive perlite comprises the following raw materials in parts by weight: 10-15 parts of sodium alginate, 4-6 parts of methacrylic acid, 1-2 parts of sodium pyrophosphate, 4-6 parts of methacrylamide, 0.4-0.6 part of ammonium persulfate, 0.4-0.6 part of TEMED, 1.5-2.5 parts of superfine calcium carbonate powder and 30-40 parts of perlite.
5. The method for preparing the pH-responsive perlite composite concrete as claimed in claim 4, characterized in that the preparation process of the pH-responsive perlite is as follows:
A. perlite treatment: calcining the perlite at the temperature of 850-1000 ℃ for 0.8-1h, spraying 0.9-2kg of triethoxysilane to the perlite when the temperature of the perlite is reduced to 100-120 ℃, and cooling to room temperature;
B. methacrylic acid treatment: mixing methacrylic acid and deionized water according to the mass ratio of 1: 25, dissolving, introducing nitrogen, adding methacrylamide with the same mass as methacrylic acid, and uniformly stirring for later use;
C. and (3) sodium alginate treatment: sodium alginate and deionized water are mixed according to the mass ratio of 1: 20, stirring uniformly, adding sodium pyrophosphate, and stirring at 60-70 ℃ for 40-60min for later use;
D. preparation of pH response perlite: mixing the treated perlite with the treated methacrylic acid, the treated sodium alginate, ammonium persulfate, TEMED and superfine calcium carbonate powder, stirring uniformly, then carrying out vacuum treatment, taking out, and irradiating for 10-20min under ultraviolet rays to obtain the pH response perlite.
6. The method for preparing the pH-responsive perlite composite concrete as claimed in claim 5, wherein the nitrogen is introduced for 10-20min in the methacrylic acid treatment step, and the flow rate of the introduced nitrogen is 2L/min.
7. The method for preparing pH response perlite composite concrete as claimed in claim 6, characterized in that the vacuum treatment operation in the pH response perlite preparation step is as follows: mixing the treated perlite and the treated methacrylic acid and other raw materials, stirring uniformly, adding into a vacuum cylinder, adjusting the vacuum degree to 0.05-0.1MPa, and carrying out vacuum treatment for 3-4 h.
8. The method for preparing the pH-responsive perlite composite concrete as claimed in claim 7, wherein in the mortar preparation step, the total mass ratio of water to cement, fly ash and mineral powder is 1: (2-2.5).
9. The method for preparing the pH-responsive perlite composite concrete as claimed in claim 8, wherein in the mortar preparation step, the fine aggregate is machine-made sand with a particle size of less than 3mm, and the coarse aggregate is cobble gravel with a particle size of 5-10 mm.
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| CN116715535A (en) * | 2023-06-15 | 2023-09-08 | 广西中玻新材料科技集团有限公司 | Fly ash plate with sound insulation function |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116715535A (en) * | 2023-06-15 | 2023-09-08 | 广西中玻新材料科技集团有限公司 | Fly ash plate with sound insulation function |
| CN116715535B (en) * | 2023-06-15 | 2024-05-24 | 广西中玻新材料科技集团有限公司 | Fly ash plate with sound insulation function |
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