CN110590290A - A fully recycled recycled FRP reinforced concrete and its preparation method - Google Patents

Abstract

The invention relates to a fully recycled recycled glass reinforced plastic reinforced concrete and a preparation method thereof. The composition and content of the concrete are as follows in parts by weight: 14.4-17.6 parts of ordinary Portland cement; 2.7-3.3 parts of fly ash; silica fume 0.9 to 1.1 parts; 31.6 to 36.5 parts of fine aggregate; 47.34 to 57.86 parts of coarse aggregate; 2.1 to 4.9 parts of recycled FRP; 1.35 to 1.85 parts of water reducing agent; 9 to 9.27 parts of water. The regenerated FRP includes regenerated fiber and FRP powder, wherein the FRP powder content is not higher than 20%, the length of the regenerated fiber is not greater than 10mm, and the particle size of the FRP powder is not greater than 1mm. The concrete realizes the full recycling of recycled FRP, has high working performance, meets the pumping requirements, and has good ductility while the strength meets the specification requirements. The concrete solves the problems of the shortage of sand and gravel resources and the limited resources of glass fiber reinforced plastic waste and low utilization rate, and is conducive to promoting the practical engineering application of glass fiber reinforced plastic solid waste in building materials.

Description

A fully recycled recycled FRP reinforced concrete and its preparation method

technical field

The invention relates to the comprehensive utilization of resources of industrial solid waste and the field of concrete materials, in particular to a fully recovered and recycled FRP reinforced concrete and a preparation method thereof.

Background technique

my country's FRP industry has a large scale and rapid development, resulting in a huge amount of recycled waste FRP, which seriously affects the environment and restricts the development of enterprises. Hebei Province is an important FRP production province in my country. There are more than 100 FRP products enterprises in Jizhou District of Hengshui City alone. Hebei Province produces up to 160,000 tons of leftover waste and recycled products every year. FRP materials have high strength, many components, and corrosion resistance. It is very difficult to recycle them. The traditional landfill and incineration treatment method can easily cause water, soil and air pollution, and has been forcibly banned. At present, the recycling (recycling and reuse) methods of waste FRP at home and abroad are mainly divided into: chemical recycling methods, energy recycling methods and physical recycling methods. The physical recovery method uses mechanical crushing to grind it to a certain particle size powder, which is used as a raw material for the preparation of new materials. It has the advantages of simple process, environmental protection, and low cost, and provides a good resource for the resource utilization of waste FRP materials. Using conditions and foundations is also the most commonly used and most efficient method in China.

When using physical recycling methods to process waste FRP, the recovery and processing production line of the four links of cleaning pretreatment, cutting treatment, crushing treatment and grinding treatment will finally obtain recycled FRP materials of different sizes, generally a mixture of fibers and powders. Realizing the resource utilization of these recycled materials is the key problem to be solved in the current treatment of solid waste pollution. The Chinese patent with the application number 201810300798.X discloses an anti-crack mortar for external wall plastering containing recycled fiberglass and its preparation method. By screening the physically recycled fiberglass, two specifications of 6mm and 9mm in length are obtained. The regenerated fiber was used to finally prepare the anti-crack mortar for external wall plastering, and the fiber was used to improve the anti-crack performance of the mortar. The existing resource utilization methods have not realized the full recovery of FRP waste. In view of this, this application provides a new application of FRP waste, which realizes the full recovery and resource utilization of FRP waste.

Contents of the invention

Aiming at the deficiencies of the prior art, the object of the present invention is to provide a fully recycled recycled FRP reinforced concrete and a preparation method thereof. The concrete realizes the full recycling of recycled FRP, has high working performance, meets the pumping requirements, and has good ductility while the strength meets the specification requirements. The concrete solves the problems of the shortage of sand and gravel resources and the limited resources of FRP waste and low utilization rate, and is conducive to promoting the practical engineering application of FRP solid waste in building materials.

The purpose of the present invention is to realize through the following technical solutions:

A fully recycled recycled FRP reinforced concrete, in parts by weight, the composition and content of the concrete are respectively:

Ordinary Portland cement 14.4 to 17.6 parts;

2.7 to 3.3 parts of fly ash;

0.9-1.1 parts of silica fume;

31.6 to 36.5 parts of fine aggregate;

47.34 to 57.86 parts of coarse aggregate;

2.1 to 6.8 parts of recycled glass fiber reinforced plastics;

1.35~1.85 parts of water reducing agent;

9 to 9.27 parts of water.

The weight fraction of the regenerated FRP is 2.1-4.9.

The concrete also contains 0.09-0.11 parts of a defoamer.

The regenerated FRP includes regenerated fiber and FRP powder, wherein the FRP powder content is not higher than 20%, the length of the regenerated fiber is not greater than 10mm, and the particle size of the FRP powder is not greater than 1mm.

A kind of preparation method of above-mentioned fully recovered recycled FRP reinforced concrete, the preparation method comprises the following steps:

(1) In terms of parts by weight, the above raw materials are divided into four groups, the first group is 2.1-4.9 parts of recycled glass fiber reinforced plastic and 1/3 of the total water, the second group is 47.34-57.86 parts of coarse aggregate, ordinary silicic acid 14.4-17.6 parts of salt 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, the third group is 1.35-1.85 parts of water reducing agent and 1/3 of the total water, The fourth group is 0.09-0.11 parts of defoamer and remaining water;

(2) Put the first group of regenerated FRP and water into the ultrasonic cleaning machine for pretreatment for not less than 20 minutes;

(3) Send the second group into the twin-shaft concrete mixer in the order of coarse aggregate, ordinary Portland cement, fly ash, silica fume and fine aggregate, and mix until completely uniform to obtain dry concrete ; Then the regenerated FRP after the pretreatment of step (2) is added together with water in the mixer and continues to stir for 3-5min to obtain concrete wet material;

(4) First mix the third group of water reducer and water evenly, then add to the concrete wet material obtained in step (3) and stir for 3-5 minutes; finally, mix the fourth group of defoamer and water evenly, add to In the above mixture, the stirring is continued for 3-5 minutes to obtain the fully recovered recycled FRP reinforced concrete.

Compared with the existing recovery process, the beneficial effects of the present invention include:

(1) FRP waste is processed by cutting and crushing equipment, and the regenerated FRP obtained after treatment is in the form of floc, in which recycled fiber accounts for about 85% and powder accounts for 15%. The invention directly uses the crushed mixture as fine aggregate, which saves the material used for sand, and at the same time, because the waste glass fiber reinforced plastic has almost no cost, it can also save the amount of fine aggregate used, and can significantly reduce the cost of the construction industry.

(2) At the same time, the introduction of recycled FRP into the concrete of the present invention, due to the low density of FRP, helps to reduce the proportion of concrete on the one hand, but at the same time increases the pores in the concrete. The present invention uses high-efficiency water reducing agent and concrete defoaming The agent effectively reduces the pores of the concrete, improves the compactness of the concrete, and improves the flexural strength under the premise that the compressive strength of the final material can be achieved with the formula in this application, which overcomes the use of recycled glass fiber reinforced plastics in the prior art. Concrete leads to the problem that the strength of concrete decreases too much.

(3) Adding an appropriate amount of fly ash and silica fume to the formula of this application will help to increase strength and improve work performance. The addition of water reducing agent can adjust the fluidity of concrete, thereby ensuring that the overall performance of concrete materials meets the specification requirements.

(4) The preparation method of the present invention carries out ultrasonic dispersion pretreatment to regenerated FRP, reduces the fiber ball in the regenerated FRP material, improves the dispersibility of the regenerated FRP fiber, solves the regenerated FRP fiber partially mixed in due to electrostatic adsorption Forming fiber balls together will seriously affect the mechanical properties of concrete. In the present invention, all (including fiber and powder) glass fiber reinforced plastic wastes are crushed and used as concrete fillers to realize full recovery (100% full utilization) of waste glass fiber reinforced plastics without secondary screening.

(5) The present invention combines waste glass fiber reinforced plastics with concrete to prepare a fully recycled recycled glass fiber reinforced plastic reinforced concrete material, which has high working performance, meets the pumping requirements, and has the advantages of low density and high ductility while the strength meets the specification requirements. The concrete overcomes the shortage of sand and gravel resources and the limited resources of FRP waste and low utilization rate, and is conducive to promoting the practical engineering application of FRP solid waste in building materials.

(6) The concrete material of this application can be applied to foundation cushions, prefabricated concrete slabs, structural columns, etc. The application of recycled FRP to concrete can well solve the problems of land occupation and environmental pollution caused by FRP waste.

Detailed ways

The present invention is further explained below in conjunction with the examples, but it is not used as a limitation to the protection scope of the present application.

A fully recycled recycled FRP reinforced concrete of the present invention, in parts by weight, the composition and content of the concrete are respectively:

Ordinary Portland cement 14.4 to 17.6 parts;

2.7 to 3.3 parts of fly ash;

0.9-1.1 parts of silica fume;

31.6 to 36.5 parts of fine aggregate;

47.34 to 57.86 parts of coarse aggregate;

2.1 to 4.9 parts of recycled glass fiber reinforced plastics;

0.09-0.11 part of defoamer;

1.35~1.85 parts of water reducing agent;

9 to 9.27 parts of water.

The ordinary Portland cement is PO 42.5 ordinary Portland cement with a specific surface area of 3.41m ² /g, a density of 3.15g/cm ³ , a standard consistency water consumption of 26.8%, an initial setting time of 50 minutes, and a final setting time of 350min, the calcium oxide content is 55.1%, the silicon dioxide content is 8.59%, the aluminum oxide content is 9.92%, the 3-day flexural strength is 4MPa, the 3-day compressive strength is 18MPa, and the 28-day flexural strength is 8MPa. The 28-day compressive strength is 45MPa.

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 μm, and the residual sieve of the square hole sieve is 17.5%. The silica fume has a density of 2.3g/cm ³ and a specific surface area of 25-29m ² /g.

The fine aggregate is natural river sand, which belongs to medium sand, with a fineness modulus of 2.65, particle size distribution in line with the requirements of natural sand zone 2 in the national standard GB/T14684-2011 "Sand for Construction", and a mud content of less than 0.1 %.

The coarse aggregate is 5-20mm continuous graded granite crushed stone or other crushed stones, such as limestone. The continuous graded granite crushed stone has an apparent density of 2740kg/m ³ , a mud content of less than 0.52%, a mud content of 0.21%, a needle flake content of 6.0%, and a stone crushing value of 5.5.

The regenerated FRP is FRP waste which is processed by cutting and crushing equipment, and the FRP waste is in floc form after treatment, wherein recycled fiber accounts for about 85% and powder accounts for 15%. The length of the fiber is not more than 10mm, the particle size of the powder is not more than 1mm; the content of CaO is 56%-63%, the content of _SiO2 is 4.7%-10.6%, and the content of _Al2O3 is 4.6% _-5.9 %. FRP waste can be industrial FRP waste such as fan blades and leftovers of wind power plants or scrapped automobile FRP waste. The length and degree of fragmentation of recycled FRP will affect the overall performance of concrete, but the formula in this application can be produced to meet the requirements of the country. For standardized concrete materials, the strength performance of the whole concrete will be slightly different when FRP with different lengths or degrees of fragmentation is added. If the content of powder in recycled FRP is too high, it will affect the decrease of the bending strength of concrete. If the powder in recycled FRP exists in granular form, it will affect the overall compressive strength. If the content of fiber in recycled FRP is too small, it will affect the overall strength. bending performance.

The water reducer is a polycarboxylate water reducer with a water reducing rate greater than 30% and a solid content of 36.5%; the defoamer is one of the DF-119/868/176 or AIR-11 series , this kind of defoamer is suitable for defoaming under the condition of strong alkali, can maintain a good physical state, does not break the emulsion, breaks the foam and suppresses the foam, defoams quickly, suppresses the foam for a long time, and is non-toxic, tasteless, and will not affect the any pollution of the environment.

The preparation method of the above-mentioned fully recycled recycled FRP reinforced concrete, the preparation method comprises the following steps:

(1) In terms of parts by weight, the above raw materials are divided into four groups, the first group is 2.1-4.9 parts of recycled glass fiber reinforced plastic and 3-3.09 parts of water, the second group is 47.34-57.86 parts of coarse aggregate, ordinary Portland cement 14.4-17.6 parts, 2.7-3.3 parts of fly ash, 0.9-1.1 parts of silica fume, 31.6-36.5 parts of fine aggregate, the third group is 1.35-1.85 parts of water reducing agent and 3-3.09 parts of water, the fourth group is 0.09-0.11 parts of defoamer and 3-3.09 parts of water;

(2) Put 2.1-4.9 parts of regenerated glass fiber reinforced plastics and 3-3.09 parts of water in the first group into an ultrasonic cleaning machine for pretreatment for 30 minutes.

(3) For the second group, 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, 31.6-36.5 parts of fine aggregate Aggregate, cement, fly ash, silica fume and fine aggregate are sequentially fed into a twin-shaft concrete mixer for mixing until completely mixed and uniform to obtain dry concrete. Then add the regenerated FRP pretreated in step (2) together with water into the mixer and continue stirring for 3-5 minutes to obtain concrete wet material.

(4) Mix 1.35-1.85 parts of water reducing agent and 3-3.09 parts of water in the third group first, then add to the wet concrete material obtained in step (3) and stir for 3-5 minutes, and finally mix 0.09-3.09 parts of water in the third group Mix 0.11 parts of defoamer with 3-3.09 parts of water evenly, add to the above mixture, and continue to stir for 3-5 minutes to obtain the fully recycled recycled FRP reinforced concrete.

According to "Standard for Test Method of Common Concrete Mixture Performance" GB/T 50080-2016 and "Standard for Test Method of Mechanical Performance of Ordinary Concrete" GB/T 50081-2002, the formula provided by the present invention and the performance of the concrete obtained by the preparation method are carried out. Test, i.e. slump, fluidity test, coagulation time test, compressive strength evaluation, flexural strength evaluation (toughness) and splitting strength evaluation, use concrete of the present invention to meet " concrete quality control standard " GB 50164-2011 through testing The proposed workability and mechanical properties are combined with the advantages of low density and high ductility.

Example 1

In this embodiment, a kind of fully recycled recycled FRP reinforced concrete, in parts by weight, the composition and content of the concrete are respectively:

P.O 42.5 Ordinary Portland cement 14.9 parts;

2.8 parts of fly ash;

0.95 parts of silica fume;

32.1 parts of fine aggregate;

Coarse aggregate 48.35 parts;

2.1 parts of recycled fiberglass;

0.095 parts of defoamer;

1.39 parts of water reducing agent;

9.06 parts of water.

The specific surface area of PO 42.5 ordinary Portland cement is 3.41m ² /g, the density is 3.15g/cm ³ , the water consumption of standard consistency is 26.8%, the initial setting time is 50min, the final setting time is 350min, and the calcium oxide content is 55.1%. , the silicon dioxide content is 8.59%, the aluminum oxide content is 9.92%, the 3-day flexural strength is 4MPa, the 3-day compressive strength is 18MPa, the 28-day flexural strength is 8MPa, and the 28-day compressive strength is 45MPa.

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% after sieving through a 45 μm square hole sieve. The silica fume has a density of 2.3g/cm ³ and a specific surface area of 25-29m ² /g.

The fine aggregate is natural river sand, which belongs to medium sand, with a fineness modulus of 2.65, particle size distribution in line with the requirements of natural sand zone 2 in the national standard GB/T14684-2011 "Sand for Construction", and a mud content of less than 0.1 %.

Coarse aggregate is 5-20mm continuous graded granite crushed stone, apparent density is 2740kg/m ³ , mud content is less than 0.52%, mud content is 0.21%, needle flake content is 6.0%, stone crushing value is 5.5.

Regenerated FRP is the wind power plant's fan blades and leftover FRP waste, which is processed by cutting and crushing equipment. After the FRP waste is processed, it is in a flocculent form, of which recycled fiber accounts for about 85% and powder accounts for 15%. The length of the fiber is not more than 10mm, the particle size of the powder is not more than 1mm; the content of CaO is 56%-63%, the content of _SiO2 is 4.7%-10.6%, and the content of _Al2O3 is 4.6% _-5.9 %.

The water reducer is a polycarboxylate water reducer with a water reducing rate greater than 30% and a solid content of 36.5%; the defoamer is DF-119.

The preparation method of the above-mentioned fully recycled recycled FRP reinforced concrete, the preparation method comprises the following steps:

(1) In terms of parts by weight, the above raw materials are divided into four groups, the first group is 2.1 parts of recycled FRP and 3.02 parts of water, the second group is 48.35 parts of coarse aggregate, 14.9 parts of ordinary portland cement, fly ash 2.8 parts, 0.95 parts of silica fume, 32.1 parts of fine aggregate, the third group is 1.39 parts of water reducer and 3.02 parts of water, the fourth group is 0.095 parts of defoamer and 3.02 parts of water;

(2) Put 1.8 parts of regenerated FRP and 3.02 parts of water in the first group into an ultrasonic cleaning machine for pretreatment for 30 minutes.

(3) 48.35 parts of coarse aggregate, 14.9 parts of ordinary Portland cement, 2.8 parts of fly ash, 0.95 parts of silica fume, and 32.1 parts of fine aggregate of the second group were divided into coarse aggregate, cement, fly ash, silicon The ash and fine aggregate are sequentially sent to the twin-shaft concrete mixer for mixing and stirring until they are completely mixed and uniform to obtain dry concrete. Then add the regenerated FRP pretreated in step (2) together with water into the mixer and continue stirring for 3 minutes to obtain wet concrete.

(4) Mix 1.39 parts of water reducer and 3.02 parts of water in the third group first, then add them to the concrete wet material obtained in step (3) and stir for 4 minutes, and finally mix 0.095 parts of defoamer and 3.02 parts of the third group Mix the water evenly, add it to the above mixture, and continue stirring for 3 minutes to obtain the fully recycled recycled FRP reinforced concrete.

According to GB/T 50080-2016 and GB/T 50081-2002 of GB/T 50080-2016 and GB/T 50081-2002 of "Standards for Test Methods of Performance of Ordinary Concrete Mixtures", the relevant performance tests of the concrete in this embodiment were carried out:

Slump: When the amount of recycled FRP is small, it has little effect on the fluidity of the concrete material. When the amount of recycled FRP is large, it is easy to cause poor particle gradation, poor fluidity, and smaller slump of concrete , Do not use pumping construction. In this embodiment, the slump meets the pumping requirements by adjusting the ratio of the amount of water reducing agent to the amount of recycled FRP.

Evaluation of mechanical properties:

The mechanical properties of the concrete of this embodiment were tested with reference to the "Standard for Test Methods of Mechanical Properties of Ordinary Concrete" (GB/T50081-2002). The test results meet the requirements of "Concrete Quality Control Standard" GB 50164-2011 for C25 concrete.

Example 2

In this embodiment, a kind of fully recycled recycled FRP reinforced concrete, in parts by weight, the composition and content of the concrete are respectively:

Ordinary Portland cement 15.6 parts;

2.8 parts of fly ash;

0.97 parts of silica fume;

33.4 parts of fine aggregate;

Coarse aggregate 49.6 parts;

3.7 parts of recycled fiberglass;

0.1 part of defoamer;

1.49 parts of water reducing agent;

9.18 parts of water.

The selection of the material species in this implementation is the same as in Example 1.

The preparation method of the fully recycled recycled FRP reinforced concrete in this embodiment is:

(1) In parts by weight, the above raw materials are divided into four groups, the first group is 3.7 parts of recycled FRP and 3.06 parts of water, the second group is 49.6 parts of coarse aggregate, 15.6 parts of ordinary portland cement, fly ash 2.8 parts, 0.97 parts of silica fume, 33.4 parts of fine aggregate, the third group is 1.49 parts of water reducer and 3.06 parts of water, the fourth group is 0.1 parts of defoamer and 3.06 parts of water;

(2) Put 3.7 parts of regenerated FRP and 3.06 parts of water in the first group into an ultrasonic cleaning machine for pretreatment for 30 minutes.

(3) 49.6 parts of coarse aggregate, 15.6 parts of ordinary Portland cement, 2.8 parts of fly ash, 0.97 parts of silica fume, and 33.4 parts of fine aggregate of the second group were divided into coarse aggregate, cement, fly ash, silicon The ash and fine aggregate are sequentially sent to the twin-shaft concrete mixer for mixing and stirring until they are completely mixed and uniform to obtain dry concrete. Then add the regenerated FRP pretreated in step (2) together with water into the mixer and continue stirring for 5 minutes to obtain concrete wet material.

(4) First mix 1.49 parts of water reducer and 3.06 parts of water in the third group evenly, then add them to the concrete wet material obtained in step (3) and stir for 4 minutes, and finally mix 0.1 parts of defoamer and 3.06 parts of the third group Mix the water evenly, add it to the above mixture, and continue to stir for 5 minutes to obtain the fully recycled recycled FRP reinforced concrete.

Example 3

In this embodiment, a kind of fully recycled recycled FRP reinforced concrete, in parts by weight, the composition and content of the concrete are respectively:

Ordinary Portland cement 16.8 parts;

3.2 parts of fly ash;

1.1 parts of silica fume;

36.1 parts of fine aggregate;

Coarse aggregate 56.8 parts;

4.7 parts of recycled glass fiber reinforced plastics;

0.11 part of defoamer,

1.8 parts of water reducing agent;

9.27 parts of water.

The preparation method and material type selection of the concrete in this embodiment are the same as in Embodiment 1.

Example 4

In this embodiment, a kind of fully recycled recycled FRP reinforced concrete, in parts by weight, the composition and content of the concrete are respectively:

Ordinary Portland cement 14.9 parts;

2.8 parts of fly ash;

0.95 parts of silica fume;

32.1 parts of fine aggregate;

Coarse aggregate 48.35 parts;

6.8 parts of recycled glass fiber reinforced plastics;

0.095 parts of defoamer,

1.39 parts of water reducing agent;

9.06 parts of water.

In this embodiment, except that the amount of recycled FRP is much higher than the recommended range, the amount of other materials and the preparation method of concrete are the same as in Example 1.

Example 5

In this embodiment, a kind of fully recycled recycled FRP reinforced concrete, in parts by weight, the composition and content of the concrete are respectively:

Ordinary Portland cement 14.9 parts;

2.8 parts of fly ash;

0.95 parts of silica fume;

32.1 parts of fine aggregate;

Coarse aggregate 48.35 parts;

2.1 parts of recycled glass fiber reinforced plastics;

0.095 parts of defoamer

1.39 parts of water reducing agent;

9.06 parts of water.

In this example, the recycled FRP is not subjected to ultrasonic dispersion pretreatment, and the amount of materials and the preparation method of concrete are the same as in Example 1.

Example 6

In this embodiment, a kind of fully recycled recycled FRP reinforced concrete, in parts by weight, the composition and content of the concrete are respectively:

Ordinary Portland cement 14.9 parts;

2.8 parts of fly ash;

0.95 parts of silica fume;

32.1 parts of fine aggregate;

Coarse aggregate 48.35 parts;

2.1 parts of recycled fiberglass;

1.39 parts of water reducing agent;

9.06 parts of water.

In this embodiment, except that no concrete defoamer is used, the type of material dosage and the preparation method of concrete are the same as in Embodiment 1.

The properties of the fully recycled FRP reinforced concrete prepared in Examples 1-6 were compared, and the results are shown in Table 1. It can be seen from the data in the table that the amount of recycled FRP within a certain range has little effect on the compressive strength of concrete, and at the same time can significantly improve the bending and tensile properties of concrete, and enhance the toughness of concrete. The fully recycled recycled FRP reinforced concrete prepared in Examples 1 to 6 all have good slump and expansion and meet the requirements of concrete pumping. The amount of regenerated FRP should not be too large, as it will reduce the anti-pressure performance of concrete. On the basis of Example 6, if the content of regenerated FRP is increased, the strength will drop very quickly and cannot be used as concrete. Comparing Example 1 and Example 5, it can be seen that ultrasonic pretreatment of recycled FRP improves the dispersion of recycled FRP fibers, weakens the influence of fiber balls on the mechanical properties of concrete, and significantly improves the overall mechanical properties of concrete. Comparative Example 1 and Example 6 effectively reduced the porosity of concrete by using high-efficiency water reducer and concrete defoamer, improved the compactness of concrete, and further improved the mechanical properties of concrete. Comparing the test data of Example 1 and the concrete without FRP, it can be seen that the mechanical properties of the concrete doped with FRP can meet the requirements of national standards, and compared with the concrete without FRP, the density is lower and the mechanical properties are better. , Therefore, recycled FRP can completely replace part of the fine aggregate, and the concrete doped with FRP can be used in actual building production, which significantly saves production costs and has huge economic and social benefits.

The required range of concrete density prepared by the formula and method of Examples ^1-3 is 1760kg/m3-2250kg/ ^m3 , the range of 28-day compressive strength is 25MPa-30MPa, the range of flexural strength is 5.0MPa-8.0MPa, and the splitting strength The range is 4.0MPa～6.0MPa, the slump range is 180mm～220mm, and the expansion degree is 500mm～550mm. The slump of the concrete mixture meets the S4 level stipulated in GB/T 50080-2016 of "Standards for Test Methods of Performance of Ordinary Concrete Mixtures". The expansion degree grade of the concrete mixture meets the F4 grade specified in the "Standards for Test Methods of Performance of Ordinary Concrete Mixtures" GB/T 50080-2016. The strength of concrete meets the requirements of "Concrete Quality Control Standard" GB 50164-2011 for C25 concrete. The concrete of embodiment 1-3 has high performance and low cost when used as a building house, and the strength of embodiment 4-6 meets the requirements of "Concrete Quality Control Standard" GB50164-2011 for C20 concrete, and can be used for concrete with different strength requirements. high places.

The invention solves the problems of the shortage of concrete sand and gravel resources and the limited resource utilization of glass fiber reinforced plastic waste and low utilization rate, and is conducive to promoting the practical engineering application of glass fiber reinforced plastic solid waste in building materials.

What is not mentioned in the present invention is applicable to the prior art, and the raw materials involved are all purchased commercially or obtained by conventional methods.

The test result of table 1 embodiment 1-6

Claims (8)

1. A kind of fully reclaimed recycled FRP reinforced concrete, in parts by weight, the composition and content of the concrete are respectively: Ordinary Portland cement 14.4~17.6 parts; 2.7~3.3 parts of fly ash; Silica fume 0.9~1.1 part; 31.6~36.5 parts of fine aggregate; 47.34~57.86 parts of coarse aggregate; 2.1~6.8 parts of recycled glass fiber reinforced plastics; 1.35~1.85 parts of water reducing agent; 9~9.27 parts of water. 2. The concrete according to claim 1, wherein the weight fraction of the regenerated FRP is 2.1-4.9. 3. The concrete according to claim 2, further comprising 0.09-0.11 parts of a defoamer in the concrete. 4. The concrete according to any one of claims 1-3, wherein the regenerated FRP is composed of regenerated fiber and FRP powder, wherein the FRP powder content is not higher than 20%, the length of the regenerated fiber is not more than 10mm, and the FRP The particle size of the powder is not greater than 1mm. 5. The concrete according to claim 4, wherein the regenerated fiber accounts for 85% of the total mass of regenerated FRP, and the FRP powder accounts for 15% of the total mass of regenerated FRP. 6. The concrete according to claim 1, wherein the regenerated FRP is obtained by processing FRP waste through a physical recovery method, and the FRP waste is fan blades and scraps of wind power plants or scrapped automobile FRP waste. 7. concrete according to claim 3, is characterized in that, described ordinary Portland cement is PO 42.5 ordinary Portland cement; The loss on ignition of described fly ash is 7.1%, and moisture content is 0.1%, The calcium oxide content is 3.7%, the water demand ratio is 104%, the fineness is 45μm, and the sieve residue is 17.5%; the density of the silica fume is 2.3 g/cm ³ , and the specific surface area is 25~29 m ² /g The fine aggregate is natural river sand, the coarse aggregate is 5-20mm continuous graded granite gravel or limestone gravel; the water reducing agent is a polycarboxylate water reducing agent, and the water reducing rate is greater than 30 %, with a solid content of 36.5%; the defoamer is one of the DF-119/868/176 or AIR-11 series. 8. A preparation method of the fully reclaimed recycled FRP reinforced concrete according to any one of claim 3, the preparation method may further comprise the steps: (1) Divide the above raw materials into four groups by weight, the first group is 2.1~4.9 parts of recycled FRP and 1/3 of the total water, the second group is 47.34~57.86 parts of coarse aggregate, ordinary silicic acid 14.4~17.6 parts of salt 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, the third group is 1.35~1.85 parts of water reducing agent and 1/3 of the total water, The fourth group is 0.09~0.11 parts of defoamer and remaining water; (2) Put the first group of regenerated FRP and water into the ultrasonic cleaning machine for pretreatment for not less than 20 minutes; (3) Send the second group into the concrete mixer in the order of coarse aggregate, ordinary Portland cement, fly ash, silica fume and fine aggregate, and mix until completely uniform to obtain dry concrete; then Step (2) Add the pretreated regenerated FRP together with water into the mixer and continue stirring for 3-5 minutes to obtain concrete wet material; (4) First mix the third group of water reducing agent and water evenly, and then add it to the concrete wet material obtained in step (3) and stir for 3-5 minutes; finally, mix the fourth group of defoamer and water evenly, add to In the above mixture, the stirring is continued for 3-5 minutes to obtain the fully recovered recycled FRP reinforced concrete.