CN110590290B - Fully-recycled glass fiber reinforced plastic reinforced concrete and preparation method thereof - Google Patents
Fully-recycled glass fiber reinforced plastic reinforced 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
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention relates to a fully-recycled glass fiber reinforced plastic reinforced concrete and a preparation method thereof, wherein the concrete comprises the following components in parts by weight: 14.4-17.6 parts of ordinary portland cement; 2.7-3.3 parts of fly ash; 0.9-1.1 parts of silica fume; 31.6-36.5 parts of fine aggregate; 47.34-57.86 parts of coarse aggregate; 2.1-4.9 parts of regenerated glass fiber reinforced plastic; 1.35-1.85 parts of a water reducing agent; 9-9.27 parts of water. The recycled glass fiber reinforced plastic comprises recycled fibers and glass fiber reinforced plastic powder, wherein the content of the glass fiber reinforced plastic powder is not higher than 20%, the length of the recycled fibers is not more than 10mm, and the particle size of the glass fiber reinforced plastic powder is not more than 1 mm. The concrete realizes the full recycling of the recycled glass fiber reinforced plastics, has higher working performance, meets the pumping requirement, and has good ductility while the strength meets the specification requirement. The concrete solves the problems of sand and stone resource shortage, limited resource utilization of glass fiber reinforced plastic waste and low utilization rate, and is favorable for promoting the practical engineering application of glass fiber reinforced plastic solid waste in building materials.
Description
Technical Field
The invention relates to the field of comprehensive utilization of resources of industrial solid wastes and concrete materials, in particular to fully-recycled and regenerated glass fiber reinforced plastic reinforced concrete and a preparation method thereof.
Background
The glass fiber reinforced plastic industry in China is large in scale and high in development speed, and the quantity of the produced recycled waste glass fiber reinforced plastic is large, so that the environment is seriously influenced and the enterprise development is restricted. Hebei province is an important province of glass fiber reinforced plastic production in China, 100 glass fiber reinforced plastic product enterprises are owned in Jizhou district of Heshui city, and the leftover waste and the recycled products generated in Hebei province each year are 16 million tons. The glass fiber reinforced plastic material has high strength, multiple components, corrosion resistance and great recycling difficulty, and the traditional burying incineration treatment method is extremely easy to cause water, soil and atmosphere pollution and is forbidden by force. At present, the resource (recycling and reusing) method of the waste glass fiber reinforced plastics at home and abroad mainly comprises the following steps: chemical recovery processes, energy recovery processes, and physical recovery processes. The physical recovery method utilizes a mechanical crushing method to grind the powder to a certain particle size, is used as a raw material for preparing a new material, has the advantages of simple process, environmental protection, low cost and the like, provides utilization conditions and a foundation for resource utilization of waste glass fiber reinforced plastic materials, and is the most common method in China and the highest efficiency.
When the waste glass fiber reinforced plastic is treated by a physical recovery method, the regenerated glass fiber reinforced plastic materials with different sizes, which are generally mixed bodies of fibers and powder, are finally obtained through a recovery treatment production line comprising four links of cleaning pretreatment, cutting treatment, crushing treatment and grinding treatment. Realizing the resource utilization of the regeneration materials is a key problem to be solved urgently in the current treatment of solid waste pollution. Chinese patent with application number 201810300798.X discloses an outer wall plastering anti-crack mortar containing recycled fiber of glass fiber reinforced plastics and a preparation method thereof, wherein the recycled fiber with the length of 6mm and 9mm is obtained by screening the physically recycled glass fiber reinforced plastics, and finally the outer wall plastering anti-crack mortar is prepared, and the anti-crack performance of the mortar is improved by using the fiber. The existing resource utilization method does not realize the full recovery of the glass fiber reinforced plastic waste, so that the application provides a new application of the glass fiber reinforced plastic waste, and the full recovery and resource utilization of the glass fiber reinforced plastic waste are realized.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide the fully-recycled and regenerated glass fiber reinforced plastic reinforced concrete and the preparation method thereof. The concrete realizes the full recycling of the recycled glass fiber reinforced plastics, has higher working performance, meets the pumping requirement, and has good ductility while the strength meets the specification requirement. The concrete solves the problems of sand and stone resource shortage, limited resource utilization of glass fiber reinforced plastic waste and low utilization rate, and is favorable for promoting the practical engineering application of glass fiber reinforced plastic solid waste in building materials.
The purpose of the invention is realized by the following technical scheme:
the fully recycled and regenerated glass fiber reinforced plastic reinforced concrete comprises the following components in parts by weight:
14.4-17.6 parts of ordinary portland cement;
2.7-3.3 parts of fly ash;
0.9-1.1 parts of silica fume;
31.6-36.5 parts of fine aggregate;
47.34-57.86 parts of coarse aggregate;
2.1-6.8 parts of regenerated glass fiber reinforced plastic;
1.35-1.85 parts of a water reducing agent;
9-9.27 parts of water.
The weight fraction of the regenerated glass fiber reinforced plastic is 2.1-4.9.
The concrete also comprises 0.09-0.11 part of defoaming agent.
The recycled glass fiber reinforced plastic comprises recycled fibers and glass fiber reinforced plastic powder, wherein the content of the glass fiber reinforced plastic powder is not higher than 20%, the length of the recycled fibers is not more than 10mm, and the particle size of the glass fiber reinforced plastic powder is not more than 1 mm.
A preparation method of the fully-recycled glass fiber reinforced plastic reinforced concrete comprises the following steps:
(1) the raw materials are divided into four groups according to parts by weight, wherein the first group comprises 2.1-4.9 parts of recycled glass fiber reinforced plastic and 1/3 parts of water in total water amount, the second group comprises 47.34-57.86 parts of coarse aggregate, 14.4-17.6 parts of ordinary portland cement, 2.7-3.3 parts of fly ash, 0.9-1.1 parts of silica fume and 31.6-36.5 parts of fine aggregate, the third group comprises 1.35-1.85 parts of water reducing agent and 1/3 parts of water in total water amount, and the fourth group comprises 0.09-0.11 part of defoaming agent and the rest of water;
(2) putting the first group of regenerated glass fiber reinforced plastics and water into an ultrasonic cleaning machine for pretreatment for not less than 20 min;
(3) feeding the second group of the coarse aggregate, the ordinary portland cement, the fly ash, the silica fume and the fine aggregate into a double-horizontal-shaft concrete mixer in sequence for mixing and stirring until the coarse aggregate, the ordinary portland cement, the fly ash, the silica fume and the fine aggregate are completely and uniformly mixed to obtain a dry concrete material; then adding the regenerated glass fiber reinforced plastics pretreated in the step (2) and water into a stirrer together, and continuously stirring for 3-5min to obtain a concrete wet material;
(4) uniformly mixing the water reducing agent of the third group with water, adding the mixture into the concrete wet material obtained in the step (3), and stirring for 3-5 min; and finally, uniformly mixing the defoaming agent of the fourth group with water, adding the mixture into the mixture, and continuously stirring for 3-5min to obtain the fully-recycled regenerated glass fiber reinforced plastic reinforced concrete.
Compared with the prior recovery process, the invention has the beneficial effects that:
(1) the glass fiber reinforced plastic waste is processed by cutting and crushing equipment, and the processed regenerated glass fiber reinforced plastic is flocculent, wherein the regenerated fiber accounts for 85 percent and the powder accounts for 15 percent. The invention directly uses the mixture obtained by crushing as the fine aggregate, saves the materials of the sand, and simultaneously can obviously reduce the cost of the construction industry because the waste glass fiber reinforced plastics have almost no cost and can also save the use amount of the fine aggregate.
(2) Meanwhile, the recycled glass fiber reinforced plastic is introduced into the concrete, and due to the low density of the glass fiber reinforced plastic, on one hand, the specific gravity of the concrete is favorably reduced, but the pores in the concrete are increased, the pores of the concrete are effectively reduced by using the high-efficiency water reducing agent and the concrete defoaming agent, the compactness of the concrete is improved, the bending strength can be improved on the premise that the compressive strength of a final material is hardly reduced by matching with the formula in the application, and the problem that the strength of the concrete is reduced too much due to the fact that the recycled glass fiber reinforced plastic is used for the concrete in the prior art is solved.
(3) Proper amount of fly ash and silica fume are added in the formula, so that the strength is improved, the working performance is improved, the fluidity of concrete can be adjusted by adding the water reducing agent, and the integral performance of the concrete material is ensured to meet the standard requirement.
(4) The preparation method of the invention carries out ultrasonic dispersion pretreatment on the regenerated glass fiber reinforced plastic, reduces fiber balls in the regenerated glass fiber reinforced plastic material, improves the dispersibility of the regenerated glass fiber reinforced plastic, and solves the problem that the mechanical property of concrete is seriously influenced by the fiber balls formed by mixing and combining the regenerated glass fiber reinforced plastic fibers due to electrostatic adsorption. In the invention, all (including fiber and powder) glass fiber reinforced plastic waste is crushed and used as concrete filler, so that the full recovery (100 percent full utilization) of the waste glass fiber reinforced plastic is realized, and secondary screening is not needed.
(5) The invention combines the glass fiber reinforced plastic waste material and the concrete to prepare the fully-recycled glass fiber reinforced plastic reinforced concrete material, has higher working performance, meets the pumping requirement, and has the advantages of low density and high ductility while the strength meets the specification requirement. The concrete overcomes the problems of sand and stone resource shortage, limited resource utilization of glass fiber reinforced plastic waste and low utilization rate, and is beneficial to promoting the practical engineering application of the glass fiber reinforced plastic solid waste in building materials.
(6) The concrete material can be applied to the aspects of foundation cushion layer, precast concrete board, constructional column and the like, and the recycled glass fiber reinforced plastics can be applied to the concrete to well solve the problems that the glass fiber reinforced plastics waste occupies the land and pollutes the environment.
Detailed Description
The present invention is further explained with reference to the following examples, which should not be construed as limiting the scope of the present invention.
The invention relates to a fully-recycled glass fiber reinforced plastic reinforced concrete, which comprises the following components in parts by weight:
14.4-17.6 parts of ordinary portland cement;
2.7-3.3 parts of fly ash;
0.9-1.1 parts of silica fume;
31.6-36.5 parts of fine aggregate;
47.34-57.86 parts of coarse aggregate;
2.1-4.9 parts of regenerated glass fiber reinforced plastic;
0.09-0.11 part of defoaming agent;
1.35-1.85 parts of a water reducing agent;
9-9.27 parts of water.
The ordinary portland cement is P.O 42.5.5 ordinary portland cement, and the specific surface area of the ordinary portland cement is 3.41m2G, density 3.15g/cm3The water consumption for the standard consistency is 26.8 percent, the initial setting time is 50min, the final setting time is 350min, the calcium oxide content is 55.1 percent, the silicon dioxide content is 8.59 percent, the aluminum oxide content is 9.92 percent, the 3-day breaking strength is 4MPa, the 3-day compressive strength is 18MPa, the 28-day breaking strength is 8MPa, and the 28-day compressive strength is 45 MPa.
The loss on ignition of the fly ash is 7.1%, the water content is 0.1%, the calcium oxide content is 3.7%, the water demand ratio is 104%, the fineness is 45 mu m, and the residue on a square-hole sieve is 17.5%. The density of the silica fume is 2.3g/cm3The specific surface area is 25 to 29m2/g。
The fine aggregate is natural river sand, belongs to medium sand, has the fineness modulus of 2.65, and has the particle size distribution meeting the requirements of natural sand 2 in national standard GB/T14684-2011 'construction sand', and the mud content is less than 0.1%.
The coarse aggregate is 5-20mm continuous graded granite macadam or other macadams, such as limestone. Continuous gradationThe apparent density of the granite macadam is 2740kg/m3The mud content is less than 0.52 percent, the mud block content is 0.21 percent, the needle sheet content is 6.0 percent, and the stone crushing value is 5.5 percent.
The regenerated glass fiber reinforced plastic is formed by processing glass fiber reinforced plastic waste through cutting and crushing equipment, wherein the processed glass fiber reinforced plastic waste is flocculent, the regenerated fiber accounts for 85 percent, and the powder accounts for 15 percent. Wherein the length of the fiber is not more than 10mm, and the particle size of the powder is not more than 1 mm; CaO content is 56-63%, SiO24.7-10.6 percent of Al2O3The content is 4.6-5.9%. The glass fiber reinforced plastic waste can be industrial glass fiber reinforced plastic waste such as fan blades and leftover materials of wind power plants or scrapped automobile glass fiber reinforced plastic waste, the length of regenerated glass fiber reinforced plastic, the crushing degree and the like can influence the overall performance of concrete, but concrete materials meeting national specifications can be manufactured in the formula of the application, and the overall strength performance of the added concrete of the glass fiber reinforced plastic with different lengths or crushing degrees can be slightly different. If the content of the powder in the recycled glass fiber reinforced plastic is too high, the reduction of the flexural strength of the concrete is affected, if the powder in the recycled glass fiber reinforced plastic exists in the form of particles, the overall compressive strength is affected, and if the content of the fiber in the recycled glass fiber reinforced plastic is too low, the overall flexural performance is affected.
The water reducing agent is a polycarboxylic acid water reducing agent, the water reducing rate is more than 30%, and the solid content is 36.5%; the defoaming agent is one of DF-119/868/176 or AIR-11 series, is suitable for defoaming under the condition of strong alkali, can keep good physical state, has no demulsification, foam breaking and foam inhibiting effects, has quick defoaming, lasting foam inhibiting effect, no toxicity, no odor and no pollution to the environment.
The preparation method of the fully-recycled glass fiber reinforced plastic reinforced concrete comprises the following steps:
(1) the raw materials are divided into four groups according to parts by weight, wherein the first group comprises 2.1-4.9 parts of recycled glass fiber reinforced plastic and 3-3.09 parts of water, the second group comprises 47.34-57.86 parts of coarse aggregate, 14.4-17.6 parts of ordinary portland cement, 2.7-3.3 parts of fly ash, 0.9-1.1 parts of silica fume and 31.6-36.5 parts of fine aggregate, the third group comprises 1.35-1.85 parts of water reducing agent and 3-3.09 parts of water, and the fourth group comprises 0.09-0.11 part of defoaming agent and 3-3.09 parts of water;
(2) and putting 2.1-4.9 parts of the first group of regenerated glass fiber reinforced plastics and 3-3.09 parts of water into an ultrasonic cleaning machine for pretreatment for 30 min.
(3) And (3) feeding 47.34-57.86 parts of coarse aggregate, 14.4-17.6 parts of ordinary portland cement, 2.7-3.3 parts of fly ash, 0.9-1.1 parts of silica fume and 31.6-36.5 parts of fine aggregate of the second group into a double-horizontal-shaft concrete mixer in sequence of the coarse aggregate, the cement, the fly ash, the silica fume and the fine aggregate for mixing and stirring until the coarse aggregate, the cement, the fly ash, the silica fume and the fine aggregate are completely and uniformly mixed to obtain a dry concrete material. And (3) adding the regenerated glass fiber reinforced plastics pretreated in the step (2) and water into a stirrer together, and continuously stirring for 3-5min to obtain the concrete wet material.
(4) And (3) uniformly mixing 1.35-1.85 parts of water reducing agent of the third group and 3-3.09 parts of water, adding the mixture into the concrete wet material obtained in the step (3), stirring for 3-5min, finally uniformly mixing 0.09-0.11 part of defoaming agent of the third group and 3-3.09 parts of water, adding the mixture into the mixture, and continuously stirring for 3-5min to obtain the fully-recovered regenerated glass fiber reinforced plastic reinforced concrete.
The performance of the concrete obtained by the formula and the preparation method provided by the invention is tested according to the standard of the test method for the performance of common concrete mixture GB/T50080-2016 and the standard of the test method for the mechanical performance of common concrete GB/T50081-2002, namely the slump, the fluidity test, the agglutination time test, the compressive strength evaluation, the flexural strength evaluation (toughness) and the splitting strength evaluation, and the concrete has the advantages of low density and high ductility while meeting the working performance and the mechanical performance proposed by the standard of the quality control of concrete GB50164-2011 through testing.
Example 1
The fully recycled and regenerated glass fiber reinforced plastic reinforced concrete comprises the following components in parts by weight:
P.O 42.5.5 parts of ordinary Portland cement;
2.8 parts of fly ash;
0.95 part of silica fume;
32.1 parts of fine aggregate;
48.35 parts of coarse aggregate;
2.1 parts of regenerated glass fiber reinforced plastic;
0.095 part of defoaming agent;
1.39 parts of a water reducing agent;
9.06 parts of water.
P.O 42.5.5 ordinary Portland cement has a specific surface area of 3.41m2G, density 3.15g/cm3The water consumption for the standard consistency is 26.8 percent, the initial setting time is 50min, the final setting time is 350min, the calcium oxide content is 55.1 percent, the silicon dioxide content is 8.59 percent, the aluminum oxide content is 9.92 percent, the 3-day breaking strength is 4MPa, the 3-day compressive strength is 18MPa, the 28-day breaking strength is 8MPa, and the 28-day compressive strength is 45 MPa.
The loss on ignition of the fly ash is 7.1%, the water content is 0.1%, the calcium oxide content is 3.7%, the water demand ratio is 104%, and the fineness is 17.5% of the residue of a square-hole sieve with the fineness of 45 mu m. The density of the silica fume is 2.3g/cm3The specific surface area is 25 to 29m2/g。
The fine aggregate is natural river sand, belongs to medium sand, has the fineness modulus of 2.65, and has the particle size distribution meeting the requirements of natural sand 2 in national standard GB/T14684-2011 'construction sand', and the mud content is less than 0.1%.
The coarse aggregate is 5-20mm continuous gradation granite broken stone with apparent density of 2740kg/m3The mud content is less than 0.52 percent, the mud block content is 0.21 percent, the needle sheet content is 6.0 percent, and the stone crushing value is 5.5 percent.
The regenerated glass fiber reinforced plastic is processed by cutting and crushing equipment for fan blades and leftover glass fiber reinforced plastic wastes of a wind power plant, the glass fiber reinforced plastic wastes are processed into flocculent shapes, wherein the regenerated fibers account for about 85 percent, and the powder accounts for 15 percent. Wherein the length of the fiber is not more than 10mm, and the particle size of the powder is not more than 1 mm; CaO content is 56-63%, SiO24.7-10.6 percent of Al2O3The content is 4.6-5.9%.
The water reducing agent is a polycarboxylic acid water reducing agent, the water reducing rate is more than 30%, and the solid content is 36.5%; the antifoaming agent is DF-119.
The preparation method of the fully-recycled glass fiber reinforced plastic reinforced concrete comprises the following steps:
(1) the raw materials are divided into four groups according to the parts by weight, wherein the first group comprises 2.1 parts of recycled glass fiber reinforced plastic and 3.02 parts of water, the second group comprises 48.35 parts of coarse aggregate, 14.9 parts of ordinary portland cement, 2.8 parts of fly ash, 0.95 part of silica fume and 32.1 parts of fine aggregate, the third group comprises 1.39 parts of water reducing agent and 3.02 parts of water, and the fourth group comprises 0.095 part of defoaming agent and 3.02 parts of water;
(2) the first group of 1.8 parts recycled glass fiber reinforced plastics and 3.02 parts water were put into an ultrasonic cleaner together for pretreatment for 30 min.
(3) And (3) feeding 48.35 parts of coarse aggregate, 14.9 parts of ordinary portland cement, 2.8 parts of fly ash, 0.95 part of silica fume and 32.1 parts of fine aggregate of the second group into a double-horizontal-shaft concrete mixer in sequence of the coarse aggregate, the cement, the fly ash, the silica fume and the fine aggregate to be mixed and stirred until the coarse aggregate, the cement, the fly ash, the silica fume and the fine aggregate are completely and uniformly mixed, so as to obtain the dry concrete material. And (3) adding the regenerated glass fiber reinforced plastics pretreated in the step (2) and water into a stirrer together, and continuously stirring for 3min to obtain the concrete wet material.
(4) And (3) uniformly mixing 1.39 parts of water reducing agent and 3.02 parts of water of the third group, adding the mixture into the concrete wet material obtained in the step (3), stirring for 4min, finally uniformly mixing 0.095 part of defoaming agent and 3.02 parts of water of the third group, adding the mixture into the mixture, and continuously stirring for 3min to obtain the fully-recycled glass fiber reinforced plastic reinforced concrete.
The concrete of the embodiment is subjected to related performance tests according to the standard of the test method for the performance of the common concrete mixture GB/T50080-2016 and the standard of the test method for the mechanical performance of the common concrete GB/T50081-2002:
slump: when the mixing amount of the regenerated glass fiber reinforced plastic is small, the influence on the fluidity of a concrete material is small, and when the mixing amount of the regenerated glass fiber reinforced plastic is large, poor grain composition and poor fluidity are easily caused, the slump of the concrete is reduced, and pumping construction is not utilized. In the embodiment, the slump meets the pumping requirement by regulating and controlling the proportion of the mixing amount of the water reducing agent to the mixing amount of the regenerated glass fiber reinforced plastic.
And (3) evaluating the mechanical property:
the concrete of the embodiment is subjected to mechanical property test according to standard of ordinary concrete mechanical property test method (GB/T50081-2002). The test result meets the requirement of concrete quality control standard GB50164-2011 on C25 concrete.
Example 2
The fully recycled and regenerated glass fiber reinforced plastic reinforced concrete comprises the following components in parts by weight:
15.6 parts of ordinary Portland cement;
2.8 parts of fly ash;
0.97 parts of silica fume;
33.4 parts of fine aggregate;
49.6 parts of coarse aggregate;
3.7 parts of regenerated glass fiber reinforced plastic;
0.1 part of defoaming agent;
1.49 parts of a water reducing agent;
9.18 parts of water.
The selection of the species for this example was the same as in example 1.
The preparation method of the fully recycled glass fiber reinforced plastic reinforced concrete comprises the following steps:
(1) the raw materials are divided into four groups according to the parts by weight, wherein the first group comprises 3.7 parts of recycled glass fiber reinforced plastic and 3.06 parts of water, the second group comprises 49.6 parts of coarse aggregate, 15.6 parts of ordinary portland cement, 2.8 parts of fly ash, 0.97 part of silica fume and 33.4 parts of fine aggregate, the third group comprises 1.49 parts of water reducing agent and 3.06 parts of water, and the fourth group comprises 0.1 part of defoaming agent and 3.06 parts of water;
(2) the first group of 3.7 parts recycled glass fiber reinforced plastic and 3.06 parts water were put together in an ultrasonic cleaner for pretreatment for 30 min.
(3) And (3) feeding 49.6 parts of coarse aggregate, 15.6 parts of ordinary portland cement, 2.8 parts of fly ash, 0.97 part of silica fume and 33.4 parts of fine aggregate of the second group into a double-horizontal-shaft concrete mixer in sequence of the coarse aggregate, the cement, the fly ash, the silica fume and the fine aggregate to be mixed and stirred until the coarse aggregate, the cement, the fly ash, the silica fume and the fine aggregate are completely and uniformly mixed, so as to obtain the dry concrete material. And (3) adding the regenerated glass fiber reinforced plastics pretreated in the step (2) and water into a stirrer together, and continuously stirring for 5min to obtain the concrete wet material.
(4) And (3) uniformly mixing 1.49 parts of water reducing agent and 3.06 parts of water of the third group, adding the mixture into the concrete wet material obtained in the step (3), stirring for 4min, finally uniformly mixing 0.1 part of defoaming agent and 3.06 parts of water of the third group, adding the mixture into the mixture, and continuously stirring for 5min to obtain the fully-recycled regenerated glass fiber reinforced plastic reinforced concrete.
Example 3
The fully recycled and regenerated glass fiber reinforced plastic reinforced concrete comprises the following components in parts by weight:
16.8 parts of ordinary portland cement;
3.2 parts of fly ash;
1.1 parts of silica fume;
36.1 parts of fine aggregate;
56.8 parts of coarse aggregate;
4.7 parts of regenerated glass fiber reinforced plastic;
0.11 part of defoaming agent, namely,
1.8 parts of a water reducing agent;
9.27 parts of water.
The concrete of this example was prepared by the same method and the same material type as in example 1.
Example 4
The fully recycled and regenerated glass fiber reinforced plastic reinforced concrete comprises the following components in parts by weight:
14.9 parts of ordinary Portland cement;
2.8 parts of fly ash;
0.95 part of silica fume;
32.1 parts of fine aggregate;
48.35 parts of coarse aggregate;
6.8 parts of regenerated glass fiber reinforced plastic;
0.095 part of defoaming agent,
1.39 parts of a water reducing agent;
9.06 parts of water.
In this example, the mixing amount of other materials and the preparation method of the concrete are the same as those in example 1 except that the mixing amount of the recycled glass fiber reinforced plastic is far larger than the recommended range.
Example 5
The fully recycled and regenerated glass fiber reinforced plastic reinforced concrete comprises the following components in parts by weight:
14.9 parts of ordinary Portland cement;
2.8 parts of fly ash;
0.95 part of silica fume;
32.1 parts of fine aggregate;
48.35 parts of coarse aggregate;
2.1 parts of regenerated glass fiber reinforced plastic;
0.095 portion of defoaming agent
1.39 parts of a water reducing agent;
9.06 parts of water.
In this example, the material mixing amount and the concrete preparation method were the same as in example 1 except that the regenerated glass fiber reinforced plastic was not subjected to ultrasonic dispersion pretreatment.
Example 6
The fully recycled and regenerated glass fiber reinforced plastic reinforced concrete comprises the following components in parts by weight:
14.9 parts of ordinary Portland cement;
2.8 parts of fly ash;
0.95 part of silica fume;
32.1 parts of fine aggregate;
48.35 parts of coarse aggregate;
2.1 parts of regenerated glass fiber reinforced plastic;
1.39 parts of a water reducing agent;
9.06 parts of water.
In this example, the material mixing amount and the concrete preparation method were the same as in example 1 except that no concrete defoaming agent was used.
The results of comparing the performance of the recycled glass reinforced plastic reinforced concrete prepared in examples 1 to 6 are shown in Table 1. The data in the table show that the mixing amount of the recycled glass fiber reinforced plastic is within a certain range, the influence on the compressive strength of the concrete is small, the bending resistance and the tensile strength of the concrete can be obviously improved, and the toughness of the concrete is enhanced. The fully-recycled glass fiber reinforced plastic reinforced concrete prepared in the embodiments 1-6 has good slump and expansion degree, and meets the pumping requirement of concrete. The mixing amount of the regenerated glass fiber reinforced plastic is not suitable to be too large, the compressive mechanical property of the concrete can be reduced due to too large mixing amount, and on the basis of the embodiment 6, if the content of the regenerated glass fiber reinforced plastic is increased, the strength is reduced very quickly, and the concrete cannot be used. Comparing example 1 with example 5, it can be seen that the ultrasonic pretreatment of the recycled glass fiber reinforced plastic improves the dispersibility of the recycled glass fiber reinforced plastic fiber, weakens the influence of the fiber balls on the mechanical properties of the concrete, and obviously improves the overall mechanical properties of the concrete. Compared with the prior art, the concrete has the advantages that the high-efficiency water reducing agent and the concrete defoaming agent are used in comparative example 1 and example 6, so that the porosity of the concrete is effectively reduced, the compactness of the concrete is improved, and the mechanical property of the concrete is further improved. Comparing the test data of the example 1 and the concrete without glass fiber reinforced plastics, it can be known that each mechanical property of the concrete doped with glass fiber reinforced plastics can meet the national standard requirement, and compared with the concrete without glass fiber reinforced plastics, the concrete doped with glass fiber reinforced plastics has lower density and better mechanical property, therefore, the recycled glass fiber reinforced plastics can completely replace part of fine aggregate, the concrete doped with glass fiber reinforced plastics can completely be used for actual building manufacture, the manufacture cost is obviously saved, and the concrete doped with glass fiber reinforced plastics has huge economic benefit and social benefit.
Concrete prepared according to the formulation and method of examples 1-3 has a density requirement range of 1760kg/m3～2250kg/m3The 28-day compressive strength range is 25 MPa-30 MPa, the bending strength range is 5.0 MPa-8.0 MPa, the splitting strength range is 4.0 MPa-6.0 MPa, the slump range is 180 mm-220 mm, and the extensibility is 500 mm-550 mm. The slump of the concrete mixture meets the S4 level specified in the standard of the test method for the performance of common concrete mixtures GB/T50080-2016. The expansibility grade of the concrete mixture meets the F4 grade specified in the standard of the test method for the performance of common concrete mixtures GB/T50080-2016. The concrete strength meets the requirements of GB50164 and 2011 on C25 concrete. The concrete of the examples 1 to 3 has high performance and low cost when used for building houses, and the strength of the examples 4 to 6 meets the requirement of concrete quality control standard GB50164-2011 on C20 concrete, and can be used in places with low requirement on the strength of the concrete.
The invention solves the problems of concrete aggregate resource shortage, limited resource utilization of glass fiber reinforced plastic waste and low utilization rate, and is beneficial to promoting the practical engineering application of the glass fiber reinforced plastic solid waste in building materials.
The invention is applicable to the prior art, and the raw materials involved are either commercially available or obtained by conventional methods.
TABLE 1 test results for examples 1-6
Claims (8)
1. The fully recycled and regenerated glass fiber reinforced plastic reinforced concrete comprises the following components in parts by weight:
14.4-17.6 parts of ordinary portland cement;
2.7-3.3 parts of fly ash;
0.9-1.1 parts of silica fume;
31.6-36.5 parts of fine aggregate;
47.34-57.86 parts of coarse aggregate;
2.1-6.8 parts of regenerated glass fiber reinforced plastic;
1.35-1.85 parts of a water reducing agent;
9-9.27 parts of water.
2. The concrete according to claim 1, wherein the recycled glass fiber reinforced plastic is 2.1 to 4.9 parts by weight.
3. The concrete according to claim 2, further comprising 0.09-0.11 parts of an antifoaming agent.
4. The concrete according to any one of claims 1 to 3, wherein the recycled glass fiber reinforced plastics consist of recycled fibers and glass fiber reinforced plastics powder, wherein the content of the glass fiber reinforced plastics powder is not higher than 20%, the length of the recycled fibers is not more than 10mm, and the particle size of the glass fiber reinforced plastics powder is not more than 1 mm.
5. The concrete according to claim 4, wherein the regenerated fiber accounts for 85% of the total mass of the regenerated glass fiber reinforced plastic, and the glass fiber reinforced plastic powder accounts for 15% of the total mass of the regenerated glass fiber reinforced plastic.
6. The concrete according to claim 1, wherein the recycled glass fiber reinforced plastic is obtained by processing glass fiber reinforced plastic waste through a physical recycling method, and the glass fiber reinforced plastic waste is wind turbine blades and scraps of a wind power plant or scrap glass fiber reinforced plastic waste of a scraped car.
7. The concrete according to claim 3, wherein the Portland cement is P.O 42.5.5 Portland cement; the loss on ignition of the fly ash is 7.1 percent, the water content is 0.1 percent, the calcium oxide content is 3.7 percent, the water demand ratio is 104 percent, the fineness is 45 mu m, and the screen residue of a square-hole sieve is 17.5 percent; the density of the silica fume is 2.3g/cm3The specific surface area is 25 to 29m2(ii)/g; the fine aggregate is natural river sand, and the coarse aggregate is 5-20mm continuous graded granite macadam or limestone macadam; the water reducing agent is a polycarboxylic acid water reducing agent, the water reducing rate is more than 30%, and the solid content is 36.5%; the defoaming agent is one of DF-119/868/176 or AIR-11 series.
8. A method for preparing the fully recycled glass reinforced plastic reinforced concrete as recited in claim 3, comprising the following steps:
(1) the raw materials are divided into four groups according to parts by weight, wherein the first group comprises 2.1-4.9 parts of recycled glass fiber reinforced plastic and 1/3 parts of water in total water amount, the second group comprises 47.34-57.86 parts of coarse aggregate, 14.4-17.6 parts of ordinary portland cement, 2.7-3.3 parts of fly ash, 0.9-1.1 parts of silica fume and 31.6-36.5 parts of fine aggregate, the third group comprises 1.35-1.85 parts of water reducing agent and 1/3 parts of water in total water amount, and the fourth group comprises 0.09-0.11 part of defoaming agent and the rest of water;
(2) putting the first group of regenerated glass fiber reinforced plastics and water into an ultrasonic cleaning machine for pretreatment for not less than 20 min;
(3) feeding the second group of the coarse aggregate, the ordinary portland cement, the fly ash, the silica fume and the fine aggregate into a concrete mixer in sequence for mixing and stirring until the coarse aggregate, the ordinary portland cement, the fly ash, the silica fume and the fine aggregate are completely and uniformly mixed to obtain a dry concrete material; then adding the regenerated glass fiber reinforced plastics pretreated in the step (2) and water into a stirrer together, and continuously stirring for 3-5min to obtain a concrete wet material;
(4) uniformly mixing the water reducing agent of the third group with water, adding the mixture into the concrete wet material obtained in the step (3), and stirring for 3-5 min; and finally, uniformly mixing the defoaming agent of the fourth group with water, adding the mixture into the mixture, and continuously stirring for 3-5min to obtain the fully-recycled regenerated glass fiber reinforced plastic reinforced concrete.
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