Marine concrete additive, preparation method therefor and use thereof

Abstract

A preparation method for a concrete additive for a maritime work environment includes: S1, compounding a volcanic ash material containing aluminum oxide and lime in proportion, loading a mixture into a sugar coating machine, and spraying a proper amount of alcohol, to prepare spherical particles; S2, adding the spherical particles in S1 and cement into the sugar coating machine, uniformly spraying deionized water in a rotating process, and coating surface layers of the spherical particles with a layer of cement for maintenance; and S3, placing the maintained particles in S2 into a hydrophobic emulsion, and coating the surface layers of the particles with a layer of hydrophobic emulsion, to obtain a concrete additive.

Claims

1. A preparation method for a concrete additive for a maritime work environment, comprising: S1, compounding a volcanic ash material containing aluminum oxide and lime in proportion to form a mixture, loading the mixture into a sugar coating machine, and spraying alcohol to achieve spherical particles; S2, adding the spherical particles in S1 and cement into the sugar coating machine, uniformly spraying deionized water in a rotating process, and coating surface layers of the spherical particles with a layer of cement for maintenance; wherein conditions of the maintained in S2 are as follows: humidity ranges from 90% to 95%, a temperature ranges from 20° C. to 23° C., and time ranges from 7 days to 14 days, and S3, placing the maintained particles in S2 into a hydrophobic emulsion, and coating the surface layers of the particles with a layer of hydrophobic emulsion, to obtain a concrete additive.

2. The preparation method according to claim 1, wherein the volcanic ash material containing aluminum oxide is natural volcanic ash and/or fly ash.

3. The preparation method according to claim 1, wherein a mass ratio of the volcanic ash material containing aluminum oxide to the lime is 1:1-3.

4. The preparation method according to claim 1, wherein the spherical particles obtained in S1 have a particle size ranging from 2.0 mm to 3.0 mm, and the cement in S2 has a coating thickness ranging from 2.0 mm to 3.0 mm.

5. The preparation method according to claim 1, wherein the hydrophobic emulsion in S3 is composed of a modified silicone oil siloxane polymer and water.

6. The preparation method according to claim 5, wherein a mass ratio of the modified silicone oil siloxane polymer to the water is 1:5-10.

7. The preparation method according to claim 1, wherein the sugar coating machine has a rotating speed ranging from 10 r/min to 50 r/min.

8. A concrete additive for a maritime work environment prepared by the preparation method of claim 1.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a scanning electron microscope (SEM) image and an energy dispersive spectroscopy (EDS) diagram of crack area products in a test piece of the present disclosure;

(2) FIG. 2 is a repair rate of cracks in a test piece in Embodiment 3; and

(3) FIG. 3 is repair rates of cracks in test pieces of Embodiment 1-3.

DETAILED DESCRIPTION OF THE EMBODIMENTS

(4) In order to further understand the content of the present disclosure, the present disclosure will be described in detail with reference to the accompanying drawings and embodiments.

Embodiment 1

(5) A marine concrete additive and a preparation method therefor are provided. The preparation method includes:

(6) S1, compound a fly ash and lime in a mass ratio of 1:1, load a mixture into a sugar coating machine, and spray a proper amount of alcohol, to prepare spherical particles having a particle size of 2.0 mm, the sugar coating machine having a rotating speed of 10 r/min, and a liquid spraying amount of 5 ml/min;

(7) S2, add the spherical particles and cement into the sugar coating machine, uniformly spray deionized water in a rotating process, and coat surface layers of the spherical particles with a layer of cement having a thickness of 2.0 mm for maintenance under a standard condition, conditions of the maintenance being as follows: humidity ranges from 90% to 95%, a temperature ranges from 20° C. to 23° C., and time ranges from 7 days; and

(8) S3, place the maintained particles into a hydrophobic emulsion, the hydrophobic emulsion being composed of a modified silicone oil siloxane polymer and water, a ratio of the modified silicone oil siloxane polymer to the water being 1:5, and coat the surface layers of the particles with a layer of hydrophobic emulsion, to obtain a concrete additive.

(9) Use test: the concrete additive prepared in Embodiment 1 is used to replace 2% of sand, and a water cement ratio is kept unchanged to prepare a φ100 mm*100 mm test piece. The test piece is maintained at a normal temperature for 24 hours, and then is maintained in a normal-temperature water environment for 28 days, then cracks having a width of 100 μm are artificially manufactured by means of a press machine, and the cracked test piece is placed in a water environment containing 5% of sulfate, to monitor a crack repairing effect of the cracked test piece.

Embodiment 2

(10) A marine concrete additive and a preparation method therefor are provided. The preparation method includes:

(11) S1, compound fly ash and lime in a mass ratio of 1:3, load a mixture into a sugar coating machine, and spray a proper amount of alcohol, to prepare spherical particles having a particle size of 2.0 mm, the sugar coating machine having a rotating speed of 50 r/min, and a liquid spraying amount of 20 ml/min;

(12) S2, add the spherical particles and cement into the sugar coating machine, uniformly spray deionized water in a rotating process, and coat surface layers of the spherical particles with a layer of cement having a thickness of 2.0 mm for maintenance under a standard condition, conditions of the maintenance being as follows: humidity ranges from 90% to 95%, a temperature ranges from 20° C. to 23° C., and time ranges from 7 days; and

(13) S3, place the maintained particles into a hydrophobic emulsion, the hydrophobic emulsion being composed of a modified silicone oil siloxane polymer and water, a ratio of the modified silicone oil siloxane polymer to the water being 1:10, and coat the surface layers of the particles with a layer of hydrophobic emulsion, to obtain a concrete additive.

(14) Use test: the concrete additive prepared in Embodiment 2 is used to replace 8% of sand, and a water cement ratio is kept unchanged to prepare a φ100 mm*100 mm test piece. The test piece is maintained at a normal temperature for 24 hours, and then is maintained in a normal-temperature water environment for 28 days, then cracks having a width of 100 μm are artificially manufactured by means of a press machine, and the cracked test piece is placed in a water environment containing 5% of sulfate, to monitor a crack repairing effect of the cracked test piece.

Embodiment 3

(15) A marine concrete additive and a preparation method therefor are provided. The preparation method includes:

(16) S1, compound fly ash and lime in a mass ratio of 1:2, load a mixture into a sugar coating machine, and spray a proper amount of alcohol, to prepare spherical particles having a particle size of 2.0 mm, the sugar coating machine having a rotating speed of 20 r/min, and a liquid spraying amount of 10 ml/min;

(17) S2, add the spherical particles and cement into the sugar coating machine, uniformly spray deionized water in a rotating process, and coat surface layers of the spherical particles with a layer of cement having a thickness of 2.0 mm for maintenance under a standard condition, conditions of the maintenance being as follows: humidity ranges from 90% to 95%, a temperature ranges from 20° C. to 23° C., and time ranges from 7 days; and

(18) S3, place the maintained particles into a hydrophobic emulsion, the hydrophobic emulsion being composed of a modified silicone oil siloxane polymer and water, a ratio of the modified silicone oil siloxane polymer to the water being 1:5, and coat the surface layers of the particles with a layer of hydrophobic emulsion, to obtain a concrete additive.

(19) Use test: the concrete additive prepared in Embodiment 2 is used to replace 5% of sand, and a water cement ratio is kept unchanged to prepare a φ100 mm*100 mm test piece. The test piece is maintained at a normal temperature for 24 hours, and then is maintained in a normal-temperature water environment for 28 days, then cracks having a width of 100 μm are artificially manufactured by means of a press machine, and the cracked test piece is placed in a water environment containing 5% of sulfate, to monitor a crack repairing effect of the cracked test piece.

(20) FIG. 1 is a scanning electron microscope (SEM) image and an energy dispersive spectroscopy (EDS) diagram of crack area products in a test piece prepared, which indicates that a mineralized product consisting of C, O, Ca, Al and S elements is formed in a crack area.

(21) FIG. 2 is a repair rate of cracks in a test piece in Embodiment 3, a repair effect of a surface is gradually enhanced along with prolonging of repair time, and the repair rate is 70% or above when repair is performed for 56 days.

(22) FIG. 3 is repair rates of cracks in test pieces of Embodiment 1-3, which indicates that repair effects in Embodiments are different when repair is performed for 56 days, and the repair rate in Embodiment 2 is the highest and is close to 80%.