CN111320431B - Marine concrete and preparation method thereof - Google Patents

Abstract

The invention discloses marine concrete and a preparation method thereof, relates to the technical field of concrete production and processing, and solves the problem that the service life of the concrete is greatly reduced because chloride ions in a seawater environment easily permeate into the concrete in a large amount to damage the internal structure of the concrete, wherein the marine concrete comprises the following components in parts by weight: 210 portions and 230 portions of cement raw materials; 65-75 parts of slag micro powder; 50-60 parts of fly ash; 150 portions of water and 170 portions of water; 780-810 parts of middling sand; 1010 and 1050 portions of gravel; 4-5 parts of a pumping agent; 3-5 parts of a water reducing agent; 4-8 parts of an anti-permeability agent; 2-6 parts of an expanding agent; 10-15 parts of filling reinforcing material; 2-5 parts of polypropylene fiber; 1-3 parts of micro silicon powder; 3-5 parts of paraffin. When the marine concrete is applied to a marine environment, the marine concrete can exert good and stable chlorine ion erosion resistance, the whole structure is not easy to damage, and the service life is greatly prolonged.

Description

Marine concrete and preparation method thereof

Technical Field

The invention relates to the technical field of concrete production and processing, in particular to marine concrete and a preparation method thereof.

Background

The marine concrete is also called marine concrete, and is developed and prepared under special environment aiming at marine structure application because the marine concrete structure is influenced by multiple factors such as water quality, strong tide, typhoon, ice and the like in marine environment.

The invention discloses a marine concrete material and a preparation method thereof in Chinese patent application with the publication number of CN109851294A, wherein each cubic meter of concrete comprises the following components by weight: 400 KG of ordinary portland cement, 800KG of sand 600, 1200KG of pebble 1000, 10-100KG of admixture, 3-10KG of modifier, 1-10KG of compacting agent, 10-20KG of hydrophobic impervious agent, 1-5KG of basalt fiber and 0.1-1KG of modified graphene. Wherein, the modifier comprises the following raw materials: the weight ratio of the melamine/modified melamine to the polycarboxylic acid water reducing agent is 1: 2; the densification agent comprises nano calcium carbonate and nano silicon dioxide in a weight ratio of 1: 1; the hydrophobic anti-permeability agent comprises silane-based powder and calcium stearate, and the weight ratio of the silane-based powder to the calcium stearate is 1:1-1: 3.

In the above application documents, the adopted compacting agent and modifying agent can effectively prevent and inhibit the segregation tendency of concrete, and can significantly reduce or even completely eliminate cracks generated after concrete pouring, and only by means of fibers and various fillers, although the compactness of concrete can be improved, so that the concrete has good water seepage resistance, but the seawater environment is rich in chloride ions, and when the content of the chloride ions permeating into the concrete is high, the internal structure of the concrete is easily damaged, so that the service life of the concrete is greatly reduced, therefore, a new scheme needs to be provided to solve the above problems.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a marine concrete, which can achieve good and stable chloride ion corrosion resistance, is not easy to damage the whole structure and greatly prolongs the service life when being applied to a marine environment.

In order to achieve the first purpose, the invention provides the following technical scheme:

the marine concrete comprises the following components in parts by weight:

210 portions and 230 portions of cement raw materials;

65-75 parts of slag micro powder;

50-60 parts of fly ash;

150 portions of water and 170 portions of water;

780 portions of middling sand and 810 portions;

1010 and 1050 portions of gravel;

4-5 parts of pumping agent;

3-5 parts of a water reducing agent;

4-8 parts of an anti-permeability agent;

2-6 parts of an expanding agent;

10-15 parts of filling reinforcing material;

2-5 parts of polypropylene fiber;

1-3 parts of micro silicon powder;

3-5 parts of paraffin.

By adopting the technical scheme, the fly ash and calcium hydroxide or other alkaline earth metal hydroxides are subjected to chemical reaction to generate a compound with hydraulic gelation performance, so that the marine concrete keeps good and stable structural strength. The slag micropowder can effectively improve the compressive strength of the marine concrete, reduce the cost of the marine concrete, inhibit alkali aggregate reaction, reduce hydration heat, reduce early temperature cracks of a marine concrete structure, improve the compactness of the marine concrete, and has obvious effects on improving the anti-seepage and anti-erosion capabilities. The pumping agent can introduce a large amount of micro bubbles into the marine concrete, improve the fluidity and water retention of the marine concrete, reduce slump loss, improve the anti-seepage and anti-freezing durability of the marine concrete, and ensure that the marine concrete has good fluidity in the pumping process and better stability under the condition of pumping pressure.

The polypropylene fiber and the silica fume have good dispersibility and filling property, the integral density and the structure strength of the marine concrete can be improved, and the polypropylene fiber and the silica fume can play a good complementary fit relation, so that the impermeability and the early-stage crack resistance of the marine concrete can be improved. The paraffin can improve the waterproof and anti-permeability capability of the marine concrete, and the paraffin can play a good role in compounding and synergism with the polypropylene fiber and the silica fume, so that the paraffin powder is melted and wrapped on the polypropylene fiber and the silica fume by utilizing the generated heat of hydration of the marine concrete in the solidification process, the integral dispersity and filling property of the polypropylene fiber and the silica fume are improved, the integral density of the marine concrete is greatly improved, and after the paraffin wrapped on the polypropylene fiber and the silica fume is re-solidified, the paraffin can play a good role in blocking the permeation of chloride ions in the marine environment, so that when the marine concrete is applied to the marine environment, the marine concrete can play a good and stable role in resisting the corrosion of the chloride ions, the integral structure is not easy to damage, and the service life is greatly prolonged.

More preferably, the particle size of the micro silicon powder is selected to be 100-200 nm; the diameter of the polypropylene fiber is 0.2-0.3mm, and the length of the polypropylene fiber is 3-12 mm; the molecular weight of the paraffin is selected to be 500-1500.

By adopting the technical scheme, the silica fume, the polypropylene fiber and the paraffin wax are selected according to the specifications, so that the silica fume and the polypropylene fiber with the specific length-diameter ratio can form closest accumulation according to the optimal proportion, the marine concrete has excellent anti-permeability performance, the paraffin wax can play a good role in limiting the polypropylene and coating the silica fume, the marine concrete keeps good and stable chlorine ion penetration resistance, and the integral structure is not easily damaged in the marine environment.

More preferably, the marine concrete further comprises 4-8 parts by weight of a functional auxiliary agent, and the functional auxiliary agent is prepared by mixing 1 (1.4-1.8) parts by weight of isobutylene triethoxysilane and sodium polyacrylate.

By adopting the technical scheme, the isobutene triethoxysilane can improve the corrosion resistance of the marine concrete and enable the surface of the marine concrete to have lower chloride ion permeability; the sodium polyacrylate can improve the binding capacity among the raw materials of each component, and a film structure formed by the sodium polyacrylate can form a chloride ion barrier net in the marine concrete; meanwhile, when the isobutene triethoxysilane and the sodium polyacrylate are mixed to be used as functional auxiliaries, good compounding synergism can be achieved between the isobutene triethoxysilane and the sodium polyacrylate, and a water seepage-resistant and chloride ion permeation-resistant network in the marine concrete is more perfect by matching the polypropylene fibers and the silica fume, so that the stability of the marine concrete in a marine environment is greatly improved.

Preferably, the water reducing agent is any one of sodium lignosulfonate, sodium sulfite, tannin and sugar calcium.

By adopting the technical scheme, the sodium lignosulfonate, the sodium sulfite, the tannin and the calcium saccharate are good water reducing agents, have good dispersing effects on raw materials of each component of the marine concrete, can reduce unit water consumption, improve the fluidity of the marine concrete, improve the compactness of the marine concrete, further reduce the water permeability of the marine concrete, have good stability and keep good and stable structural strength in an application process.

More preferably, the anti-permeability agent is any one of triethanolamine, calcium formate, calcium chloride and urea.

By adopting the technical scheme, the triethanolamine, the calcium formate, the calcium chloride and the urea are good anti-permeability agents, so that the marine concrete has good anti-permeability capability on the premise of keeping good structural strength, and further the marine concrete can keep good and stable interface bonding strength among the raw materials of each component in the using process, and the stability of the marine concrete is enhanced.

More preferably, the expanding agent is any one of calcium sulphoaluminate, calcium oxide and potassium aluminium sulphate dodecahydrate.

By adopting the technical scheme, the calcium sulphoaluminate, the calcium oxide and the potassium aluminium sulfate dodecahydrate are good expanding agents, and the expanding agents are added, so that the compressive stress generated by shrinkage deformation can be counteracted or partially counteracted by pouring the compressive stress into the concrete, the crack resistance of the marine concrete is improved, the generation of early cracks is avoided, and the integral anti-permeability capability of the marine concrete is further ensured. Meanwhile, the expanding agent generates a large amount of ettringite in the hydration process, so that capillary pores of the marine concrete are blocked, the marine concrete structure is more compact, and the impermeability is more stable.

More preferably, the filling and reinforcing material is any one or a mixture of more of quartz powder, silicon carbide, silicon nitride, corundum powder, aluminum silicate fiber and glass fiber.

By adopting the technical scheme, the quartz powder, the silicon carbide, the silicon nitride, the corundum powder, the aluminum silicate fiber and the glass fiber are good reinforcing agents, have good dispersibility in the marine concrete, and have good bonding property with raw materials of all components, so that the overall structural strength of the marine concrete after being cured and formed is greatly improved. Meanwhile, the reinforcing agent has good strength and filling property, so that the overall compactness and compressive strength of the marine concrete are greatly improved.

The second purpose of the invention is to provide a preparation method of marine concrete, when the marine concrete prepared by the method is applied in a marine environment, the marine concrete can exert good and stable chloride ion erosion resistance, the whole structure is not easy to damage, and the service life is greatly prolonged.

In order to achieve the second purpose, the invention provides the following technical scheme that the preparation method of the marine concrete comprises the following steps:

step one, stirring and drying the medium sand and the crushed stone in corresponding parts by weight in a drying barrel, controlling the temperature at 80-110 ℃, the time at 12-18min and the stirring speed at 300rpm, so as to obtain the dried medium sand and the dried crushed stone;

step two, drying, stirring and mixing the fly ash, the cement raw material, the slag micro powder and the filling reinforcement material in corresponding parts by weight, controlling the temperature at 80-110 ℃, the time at 20-40min, the stirring speed at 300-500rpm, cooling, adding the dried medium sand and the crushed stone, and continuously stirring and mixing for 10-20min to obtain a mixture;

step three, mixing the mixture and water in a stirring station, continuously stirring for 20-30min at the stirring speed of 300-600rpm, adding the corresponding parts by weight of the polypropylene fiber, the micro silicon powder and the paraffin, stirring for 10-20min at the stirring speed of 200-400rpm, and obtaining a semi-finished product;

and step four, adding the water reducing agent, the pumping agent, the anti-permeability agent and the expanding agent in corresponding parts by weight into the semi-finished product, and continuously stirring for 5-10min to obtain the marine concrete.

Through adopting above-mentioned technical scheme, dry the stirring processing with medium sand and rubble, can avoid it each other because moisture and adhesion are in the same place to enable the fracture part to split, and mix the back with other each component raw materials, be favorable to reducing the inside hole of marine concrete, and then make the marine concrete that obtains have higher compactness and compressive strength and environmental erosion resistance ability. Meanwhile, the process for preparing the marine concrete is simple to operate, and can quickly and uniformly mix the components, so that the marine concrete has high production efficiency and environment-friendly performance, and the overall quality can be guaranteed.

In summary, compared with the prior art, the invention has the following beneficial effects:

(1) the paraffin can play a good role in compounding and synergism with the polypropylene fiber and the silica fume, and in the application process, the paraffin powder is melted and coated on the polypropylene fiber and the silica fume, so that the overall dispersibility and filling property of the polypropylene fiber and the silica fume are improved, the overall density of the marine concrete is greatly improved, and the paraffin coated on the polypropylene fiber and the silica fume can play a good role in blocking the penetration of chloride ions in the marine environment after being re-cured;

(2) the silica fume, the polypropylene fiber and the paraffin wax are selected according to the specifications, so that the silica fume and the polypropylene fiber with the specific length-diameter ratio can form closest packing in an optimal proportion, the marine concrete has excellent anti-permeability performance, the marine concrete can keep good and stable anti-chloride ion permeability, and the integral structure is not easily damaged in a marine environment;

(3) when the isobutene triethoxysilane and the sodium polyacrylate are mixed to be used as the functional auxiliary agent, good compound synergism can be achieved between the isobutene triethoxysilane and the sodium polyacrylate, and the polypropylene fiber and the silica fume are matched to improve a water seepage-resistant and chloride ion permeation-resistant network in the marine concrete, so that the stability of the marine concrete in a marine environment is greatly improved.

Drawings

FIG. 1 is a process flow diagram of the present invention.

Detailed Description

The invention is described in detail below with reference to the figures and examples.

Example 1: the marine concrete comprises the following components in parts by weight as shown in Table 1, and is prepared by the following steps:

step one, stirring and drying the medium sand and the crushed stone in corresponding parts by weight in a drying barrel, controlling the temperature at 95 ℃, the time at 15min and the stirring speed at 200rpm to obtain dried medium sand and crushed stone;

step two, drying, stirring and mixing the fly ash, the cement raw material, the slag micro powder and the quartz powder in corresponding parts by weight, controlling the temperature at 95 ℃, the time at 30min and the stirring speed at 400rpm, cooling, adding the dried medium sand and the crushed stone, and continuously stirring and mixing for 15min to obtain a mixture;

mixing the mixture and water in a stirring station, continuously stirring for 25min at the stirring speed of 450rpm, adding the corresponding parts by weight of polypropylene fiber, micro silicon powder and paraffin, stirring for 15min at the stirring speed of 300rpm to obtain a semi-finished product;

and step four, adding sodium lignosulfonate, pumping agent, triethanolamine and calcium sulphoaluminate in corresponding parts by weight into the semi-finished product, and continuously stirring for 7.5min to obtain the marine concrete.

Note: in the steps, the cement raw material is 42.5-grade ordinary portland cement purchased from the southern cement limited company of Qinshan, sea salt; the slag micro powder is S95 grade and purchased from Shanghai Baotian novel building materials Co Ltd; the fly ash is selected from grade II and purchased from Shanghai and Jinjin electrician and trade Co; the medium sand is purchased from Jing county Jing Xie sandstone business department; the specification of the crushed stones is 5-25mm of first-grade ingredients purchased from Jing Xie gravel Ming district; the pumping agent is SH308(A) high-efficiency pumping agent which is purchased from Shanghaibedde concrete admixture company Limited; the particle size of the micro silicon powder is 150 nm; the diameter of the polypropylene fiber is 0.25mm, and the length of the polypropylene fiber is 7.5 mm; the molecular weight of the paraffin wax is selected to be 1000.

Example 2: the marine concrete is different from the concrete in example 1 in that the marine concrete is prepared by the following steps:

step one, stirring and drying the medium sand and the crushed stone in corresponding parts by weight in a drying barrel, controlling the temperature at 80 ℃, the time at 18min and the stirring speed at 300rpm to obtain dried medium sand and crushed stone;

step two, drying, stirring and mixing the fly ash, the cement raw material, the slag micro powder and the quartz powder in corresponding parts by weight, controlling the temperature at 80 ℃, the time at 40min and the stirring speed at 500rpm, cooling, adding the dried medium sand and the crushed stone, and continuously stirring and mixing for 20min to obtain a mixture;

mixing the mixture and water in a stirring station, continuously stirring at the stirring speed of 300rpm for 30min, adding the corresponding parts by weight of polypropylene fiber, micro silicon powder and paraffin, stirring at the stirring speed of 200rpm for 20min to obtain a semi-finished product;

and step four, adding sodium lignosulfonate, pumping agent, triethanolamine and calcium sulphoaluminate in corresponding parts by weight into the semi-finished product, and continuously stirring for 5min to obtain the marine concrete.

Example 3: the marine concrete is different from the concrete in example 1 in that the marine concrete is prepared by the following steps:

step one, stirring and drying the medium sand and the broken stone in corresponding parts by weight in a drying barrel, controlling the temperature at 110 ℃, the time at 12min and the stirring speed at 100rpm to obtain dried medium sand and broken stone;

step two, drying, stirring and mixing the fly ash, the cement raw material, the slag micro powder and the quartz powder in corresponding parts by weight, controlling the temperature at 110 ℃, the time at 20min and the stirring speed at 300rpm, cooling, adding the dried medium sand and the crushed stone, and continuously stirring and mixing for 10min to obtain a mixture;

mixing the mixture and water in a stirring station, continuously stirring at the stirring speed of 600rpm for 20min, adding the polypropylene fibers, the micro silicon powder and the paraffin wax in corresponding parts by weight, stirring at the stirring speed of 400rpm for 10min to obtain a semi-finished product;

and step four, adding sodium lignosulfonate, pumping agent, triethanolamine and calcium sulphoaluminate in corresponding parts by weight into the semi-finished product, and continuously stirring for 10min to obtain the marine concrete.

Examples 4 to 5: the marine concrete is different from the concrete in example 1 in that the components and the corresponding parts by weight are shown in Table 1.

TABLE 1 Components and parts by weight of examples 1-5

Example 6: the marine concrete is different from the concrete in the embodiment 1 in that in the step, the particle size of the silica fume is selected to be 100 nm; the diameter of the polypropylene fiber is 0.2mm, and the length of the polypropylene fiber is 3 mm; the molecular weight of the paraffin wax is selected to be 500.

Example 7: the marine concrete is different from the concrete in the embodiment 1 in that in the step, the particle size of the silica fume is 200 nm; the diameter of the polypropylene fiber is 0.3mm, and the length of the polypropylene fiber is 12 mm; the molecular weight of the paraffin wax is 1500.

Example 8: the marine concrete is different from the concrete in the embodiment 1 in that sodium lignosulfonate and the like in the step four are replaced by sodium sulfite.

Example 9: the marine concrete is different from the concrete in the embodiment 1 in that the mass of sodium lignin sulfonate and the like in the step four is replaced by tannin.

Example 10: the marine concrete is different from the concrete in the embodiment 1 in that the triethanolamine and the like in the fourth step are replaced by calcium formate.

Example 11: the marine concrete is different from the concrete in the embodiment 1 in that the triethanolamine and the like in the fourth step are replaced by calcium chloride.

Example 12: the marine concrete is different from the concrete in the embodiment 1 in that calcium sulphoaluminate and the like in the step four are replaced by calcium oxide.

Example 13: the marine concrete is different from the concrete in the embodiment 1 in that the quality of calcium sulphoaluminate and the like in the step four is replaced by potassium aluminium sulphate dodecahydrate.

Example 14: the marine concrete is different from the concrete in the embodiment 1 in that the quartz powder and the like in the step two are replaced by silicon carbide.

Example 15: the marine concrete is different from the marine concrete in the embodiment 1 in that the quartz powder and the like in the step two are replaced by glass fiber.

Example 16: the marine concrete is different from the concrete in the embodiment 1 in that the step three is specifically set as mixing the mixture and water in a stirring station, continuously stirring at the stirring speed of 450rpm for 25min, adding corresponding parts by weight of polypropylene fibers, micro silicon powder, paraffin and 6 functional additives, wherein the functional additives are obtained by mixing isobutene triethoxysilane and sodium polyacrylate according to the weight part ratio of 1:1.6, the stirring speed is 300rpm, and the stirring time is 15min, so as to obtain a semi-finished product.

Example 17: the marine concrete is different from the concrete in the embodiment 1 in that the step three is specifically set as mixing the mixture and water in a stirring station, continuously stirring at the stirring speed of 450rpm for 25min, adding corresponding parts by weight of polypropylene fiber, micro silicon powder, paraffin and 4 functional additives, wherein the functional additives are obtained by mixing isobutene triethoxysilane and sodium polyacrylate according to the weight part ratio of 1:1.4, the stirring speed is 300rpm, and the stirring time is 15min, so as to obtain a semi-finished product.

Example 18: the marine concrete is different from the concrete in the embodiment 1 in that the third concrete step is that the mixture and water are mixed in a stirring station, stirring is continuously carried out, the stirring speed is 450rpm, stirring is carried out for 25min, corresponding parts by weight of polypropylene fiber, micro silicon powder, paraffin and 8 functional additives are added, the functional additives are obtained by mixing isobutene triethoxysilane and sodium polyacrylate according to the weight part ratio of 1:1.8, the stirring speed is 300rpm, and the stirring time is 15min, so that a semi-finished product is obtained.

Comparative example 1: the marine concrete is different from the marine concrete in example 1 in that the third specific step is that the mixture and water are mixed in a stirring station, stirring is continuously carried out, the stirring speed is 450rpm, the stirring is carried out for 25min, the corresponding parts by weight of polypropylene fibers are added, the stirring speed is 300rpm, and the stirring time is 15min, so that a semi-finished product is obtained.

Comparative example 2: the marine concrete is different from the marine concrete in example 1 in that the third specific step is that the mixture and water are mixed in a stirring station, stirring is continuously carried out, the stirring speed is 450rpm, stirring is carried out for 25min, and after corresponding parts by weight of silica fume are added, the stirring speed is 300rpm, and the stirring time is 15min, so that a semi-finished product is obtained.

Comparative example 3: the marine concrete is different from the marine concrete in example 1 in that the third concrete step is that the mixture and water are mixed in a stirring station, stirring is continuously carried out, the stirring speed is 450rpm, stirring is carried out for 25min, paraffin wax with the corresponding weight part is added, the stirring speed is 300rpm, and the stirring time is 15min, so that a semi-finished product is obtained.

Comparative example 4: the marine concrete is different from the marine concrete in example 1 in that the step three is specifically set to mix the mixture and water in a mixing station, continuously stir at the stirring speed of 450rpm for 25min to obtain a semi-finished product.

Comparative example 5: the marine concrete is different from the marine concrete in the embodiment 1 in that the particle size of the silica fume in the step is 90 nm; the diameter of the polypropylene fiber is 0.15mm, and the length of the polypropylene fiber is 2.5 mm; the molecular weight of the paraffin wax is selected to be 1600.

Comparative example 6: the marine concrete is different from the concrete in the embodiment 1 in that in the step, the particle size of the silica fume is 210 nm; the diameter of the polypropylene fiber is 0.35mm, and the length of the polypropylene fiber is 12.5 mm; the molecular weight of the paraffin wax is selected to be 1600.

Comparative example 7: the marine concrete is different from the concrete in the embodiment 16 in that the third step is specifically set as mixing the mixture and water in a stirring station, continuously stirring at the stirring speed of 450rpm for 25min, adding corresponding parts by weight of polypropylene fibers, micro silicon powder, paraffin and 6 functional additives, wherein the functional additives are isobutylene triethoxysilane, the stirring speed is 300rpm, and the stirring time is 15min to obtain a semi-finished product.

Comparative example 8: the marine concrete is different from the concrete in the embodiment 16 in that the step three is specifically set as mixing the mixture and water in a stirring station, continuously stirring at the stirring speed of 450rpm for 25min, adding the corresponding parts by weight of polypropylene fiber, micro silicon powder, paraffin and 6 functional additives, wherein the stirring speed of the functional additives is 300rpm for sodium polyacrylate, and the stirring time is 15min, so as to obtain a semi-finished product.

Performance testing

Test samples: the marine concrete obtained in examples 1 to 18 was used as test samples 1 to 18, and the marine concrete obtained in comparative examples 1 to 8 was used as control samples 1 to 8.

The test method comprises the following steps: preparing standard samples from the test samples 1-18 and the comparison samples 1-8 according to contents in the statement of methods for testing the chloride ion diffusion coefficient of concrete, the development of construction technology, No. 36, No. 11 and No. 11 in 2009, and then measuring the apparent chloride ion diffusion coefficient Da (E-12 square meters per second), wherein the Da value is a test value when the samples are soaked for 90 days and recording the Da value; and then, preparing a standard sample according to GB/T50082-2009 Standard test method for the long-term performance and the durability of the common concrete, measuring the water seepage height (mm) under the maximum water seepage pressure of 2.5MPa, and recording.

And (3) test results: the test results of the test samples 1 to 18 and the control samples 1 to 8 are shown in Table 2. As can be seen from Table 2, the comparison of the test results of the test samples 1-3 and the comparison samples 1-4 shows that the paraffin can play a good role in compounding and synergism with the polypropylene fiber and the silica fume, and can greatly reduce the apparent chloride ion diffusion coefficient and the water seepage height of the marine concrete. The test results of the test samples 16-18 and the test sample 1 are compared to obtain the functional auxiliary agent, the functional auxiliary agent formed by mixing the isobutylene triethoxysilane and the sodium polyacrylate is added, the apparent chloride ion diffusion coefficient and the water seepage height of the marine concrete can be greatly reduced, the test results of the test sample 16 and the control sample 7-8 are compared to obtain the functional auxiliary agent, the isobutylene triethoxysilane and the sodium polyacrylate can be compounded and synergized, and when the functional auxiliary agent is singly used, the improvement effect is not good. The test results of the test sample 1 and the comparison samples 5-6 are compared to obtain the marine concrete, the specifications of the silicon powder, the polypropylene fiber and the paraffin wax selected by the invention are in the optimal mixing ratio, and the marine concrete with lower apparent chloride ion diffusion coefficient and lower water seepage height can be obtained.

TABLE 2 test results of test samples 1-18 and control samples 1-8

The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.

Claims (7)

1. The marine concrete is characterized by comprising the following components in parts by weight:

210 portions and 230 portions of cement raw materials;

65-75 parts of slag micro powder;

50-60 parts of fly ash;

150 portions of water and 170 portions of water;

780 portions of middling sand and 810 portions;

1010 and 1050 portions of gravel;

4-5 parts of pumping agent;

3-5 parts of a water reducing agent;

4-8 parts of an anti-permeability agent;

2-6 parts of an expanding agent;

10-15 parts of filling reinforcing material;

2-5 parts of polypropylene fiber;

1-3 parts of micro silicon powder;

3-5 parts of paraffin;

the particle size of the micro silicon powder is selected to be 100-200 nm; the diameter of the polypropylene fiber is 0.2-0.3mm, and the length of the polypropylene fiber is 3-12 mm; the molecular weight of the paraffin is selected to be 500-1500.

2. The marine concrete according to claim 1, wherein the marine concrete further comprises 4-8 parts by weight of a functional adjuvant, and the functional adjuvant is obtained by mixing 1 (1.4-1.8) parts by weight of isobutylene triethoxysilane and sodium polyacrylate.

3. The marine concrete according to claim 1, wherein the water reducing agent is selected from any one of sodium lignosulfonate, sodium sulfite, tannin and calcium saccharate.

4. The marine concrete according to claim 1, wherein the anti-permeability agent is any one of triethanolamine, calcium formate, calcium chloride and urea.

5. The marine concrete according to claim 1, wherein the expansive agent is selected from any one of calcium sulfoaluminate, calcium oxide and potassium aluminum sulfate dodecahydrate.

6. The marine concrete according to claim 1, wherein the filler-reinforcing material is selected from one or more of quartz powder, silicon carbide, silicon nitride, corundum powder, aluminum silicate fiber and glass fiber.

7. A method of preparing a marine concrete according to claim 1, comprising the steps of:

step one, stirring and drying the medium sand and the crushed stone in corresponding parts by weight in a drying barrel, controlling the temperature at 80-110 ℃, the time at 12-18min and the stirring speed at 300rpm, so as to obtain the dried medium sand and the dried crushed stone;

step two, drying, stirring and mixing the fly ash, the cement raw material, the slag micro powder and the filling reinforcement material in corresponding parts by weight, controlling the temperature at 80-110 ℃, the time at 20-40min, the stirring speed at 300-500rpm, cooling, adding the dried medium sand and the crushed stone, and continuously stirring and mixing for 10-20min to obtain a mixture;

step three, mixing the mixture and water in a stirring station, continuously stirring at the stirring speed of 300-600rpm for 20-30min, adding the corresponding parts by weight of the polypropylene fiber, the micro silicon powder and the paraffin, stirring at the stirring speed of 200-400rpm for 10-20min, and obtaining a semi-finished product;

and step four, adding the water reducing agent, the pumping agent, the anti-permeability agent and the expanding agent in corresponding parts by weight into the semi-finished product, and continuously stirring for 5-10min to obtain the marine concrete.

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