CN113816677A

CN113816677A - Corrosion-resistant rust-resistant mass concrete for coastal areas and preparation process thereof

Info

Publication number: CN113816677A
Application number: CN202111090149.XA
Authority: CN
Inventors: 李秋碧
Original assignee: Guangzhou Taihe Concrete Co ltd
Current assignee: Guangzhou Taihe Concrete Co ltd
Priority date: 2021-09-17
Filing date: 2021-09-17
Publication date: 2021-12-21

Abstract

The application relates to the technical field of concrete, and particularly discloses corrosion-resistant and rust-resistant mass concrete for coastal areas and a preparation process thereof. The mass concrete is prepared from the following raw materials in parts by weight: 300 parts of cement 250-type, 120 parts of fly ash 100-type, 20-25 parts of high-efficiency anti-cracking expanding agent, 30-40 parts of rust inhibitor, 20-30 parts of preservative, 730 parts of sand 700-type, 1100 parts of gravel 1000-type, 10-15 parts of polycarboxylic acid high-efficiency retarding water reducer and 120 parts of water 100-type; the efficient anti-cracking expanding agent comprises the following components in percentage by weight (2.5-1): 1, the wall material of the high-efficiency anti-cracking expanding agent microcapsule is a solid polymer embedded with cuprous chloride solid particles, and the core material contains the high-efficiency anti-cracking expanding agent and a surfactant. The application improves the corrosion resistance, rust resistance, crack resistance and long-term durable repair of mass concrete.

Description

Corrosion-resistant rust-resistant mass concrete for coastal areas and preparation process thereof

Technical Field

The application relates to the technical field of concrete, in particular to corrosion-resistant and rust-resistant mass concrete for coastal areas and a preparation process thereof.

Background

The mass concrete is a general term for mass concrete having a minimum physical geometric size of not less than 1m, or concrete expected to cause harmful crack generation due to temperature change and shrinkage caused by hydration of a cementitious material in the concrete.

The corrosion and rust resisting effects of the concrete are reduced by adding the rust inhibitor and the preservative in the mass concrete in the prior art. However, the large-volume concrete has harmful cracks caused by temperature change and shrinkage due to hydration of the cementing material in the concrete, and the existence of the cracks can destroy the protective effect of the rust inhibitor and the preservative on the steel bar structure, so that the steel bar framework in the concrete is exposed to cause corrosion and the like, and therefore a new technical scheme is required to be provided for solving the long-acting corrosion resistance and rust resistance effects of the large-volume concrete.

Disclosure of Invention

In order to improve the long-acting corrosion resistance and rust resistance effects of mass concrete, the application provides the corrosion-resistant rust-resistant mass concrete for coastal areas and a preparation process thereof.

In a first aspect, the application provides a corrosion-resistant rust-resistant bulk concrete for coastal areas, which adopts the following technical scheme:

the anti-corrosion and rust-resisting mass concrete for the coastal areas is prepared from the following raw materials in parts by weight:

the high-efficiency anti-cracking expanding agent comprises a high-efficiency anti-cracking expanding agent solvent and a high-efficiency anti-cracking expanding agent microcapsule; wherein the weight ratio of the efficient anti-cracking swelling agent solvent to the efficient anti-cracking swelling agent microcapsule is (2.5-1): 1, the wall material of the high-efficiency anti-cracking expanding agent microcapsule is a solid polymer embedded with cuprous chloride solid particles, and the core material contains a high-efficiency anti-cracking expanding agent and a surfactant.

Through adopting above-mentioned technical scheme, the addition of rust inhibitor and anticorrosive can form the protection film barrier layer in the concrete, meanwhile, the high-efficient anti-cracking expanding agent that the concrete added at the in-process of mixing can produce dilatability crystal hydrate, form the concrete of closely knit bulky together with the hydration reaction of cement itself, dilatability crystal hydrate can fill at protection film barrier layer week side this moment, form the closely knit type protective layer of protection film barrier layer, the holistic impervious and closely knit degree of concrete has been increased, simultaneously can also improve the long-term corrosion-resistant and the rust resistance effect to the concrete with rust inhibitor and anticorrosive together.

Preferably, the impermeability grade of the mass concrete is not less than P30, and the frost resistance grade is not less than D100.

Preferably, the particle size of the cuprous chloride particles is 0.1-100 mu m, and the high-efficiency anti-cracking expanding agent is particles with the particle size of 0.1-10 mm.

Preferably, the preparation method of the efficient anti-crack expanding agent microcapsule comprises the following steps: dissolving polystyrene serving as a wall material in a dichloroethane solution, mixing to prepare a wall material polymer solution, and dispersing cuprous chloride in the wall material polymer solution to obtain a PS suspension of cuprous chloride; then adding a high-efficiency anti-cracking expanding agent and a water-in-oil type surfactant into the cuprous chloride suspension; and (3) spray drying in inert gas atmosphere to obtain the high-efficiency anti-cracking expanding agent microcapsule.

By adopting the technical scheme, the high-efficiency anti-cracking expanding agent microcapsule is an ion-triggered microcapsule, is mainly triggered by chloride ions to release core materials in the microcapsule, and under the long-term seawater corrosion in coastal areas (the content of the chloride ions in seawater is high), when large-volume concrete is subjected to destructive cracking, the high-efficiency anti-cracking expanding agent in the microcapsule is released, and then under the action of moisture, expansive crystal hydrate (C) can be generated again₃A·3CaSO₄·32H₂O), fill concrete cracked gap to when effectively repairing cracked concrete, can also play sealed steel bar structure that is located the concrete, reduce the reinforcing bar and leak outward, thereby improved the leakproofness and the anticorrosive performance of the concrete of concrete.

The high-efficiency anti-cracking expanding agent added into the microcapsule can flow along the crack under the action of the surfactant, and at the same time, newly generated expansive crystal hydrate can not extrude and damage the original protective film barrier layer structure, and can also play a role of effectively connecting two sides of the crack, and meanwhile, redundant high-efficiency anti-cracking expanding agent can flow towards the outside of the crack, and a blocking structure similar to a plug is formed at the outer wall of the crack; when a maintenance worker performs daily inspection and maintenance on the concrete, the blocking structure can be found, so that a good early warning purpose is achieved, and in addition, an engineer can be helped to better judge the actual service life and the corroded condition of the concrete structure.

Preferably, the rust inhibitor is one or more of ST-A17 type composite rust inhibitor, amino ketone organic rust inhibitor and amino alcohol rust inhibitor.

Preferably, the rust inhibitor is further selected from aminoketone organic rust inhibitors.

By adopting the technical scheme, the amino ketone organic rust inhibitor is an organic rust inhibitor, and a chelating ring structure protective film layer taking an iron atom as a center is formed by complexing amino ketone molecules and the iron atom, and the reasons are as follows: on the one hand, because the amino of the nitrogen atom in the amino ketone molecule and the oxygen atom in the carbonyl are atoms with larger electronegativity, the amino ketone molecule and the oxygen atom can form effective adsorption with the surface oxide film of the reinforcing steel bar. On the other hand, amino and carbonyl of nitrogen atoms in the aminoketone molecule can form a chelate ring with iron atoms on the surface of the oxide film, and the chelate ring structure is very stable, so that the adsorption of the rust inhibitor on the surface of the steel bar is enhanced. And the adsorption is mostly a chemical adsorption process, once the adsorption is successful, the rust inhibitor can be combined on the surface of the steel bar very stably, and the purposes of protecting the steel bar and preventing the steel bar from being corroded and rusted are achieved.

Preferably, the ST-A17 type composite rust inhibitor is mainly compounded by inorganic substances (nitrite) and organic substances (amine salt).

Preferably, the preservative is selected from at least one of ST-A18 type preservatives and HY-400 concrete preservatives.

By adopting the technical scheme, the ST-A18 type preservative and the HY-400 concrete preservative are common concrete preservatives and can effectively resist long-acting corrosion of concrete together with the rust inhibitor after being added.

Preferably, the polycarboxylic acid high-efficiency retarding water reducing agent is one or more of HK-1 polycarboxylic acid high-efficiency water reducing agent, HTJS-5 type polycarboxylic acid high-performance water reducing agent and SPP-PC polycarboxylic acid high-efficiency retarding water reducing agent.

By adopting the technical scheme, the polycarboxylic acid high-efficiency retarding water reducing agent is selected from HK-1 polycarboxylic acid high-efficiency water reducing agent, HTJS-5 type polycarboxylic acid high-performance water reducing agent and SPP-PC polycarboxylic acid high-efficiency retarding water reducing agent, is common polycarboxylic acid water reducing agent, can effectively control the early hydration of cement in concrete, and has the advantages of reducing the temperature rise of mass concrete, reducing shrinkage, reducing creep, having no corrosion to reinforcing steel bars and the like.

Preferably, the fly ash is selected from class ii fly ash.

Preferably, the cement is selected from p.ii 42.5R cement.

In a second aspect, the application provides a preparation process of the corrosion-resistant and rust-resistant mass concrete for coastal areas, which adopts the following technical scheme:

a preparation process of corrosion-resistant rust-resistant mass concrete for coastal areas comprises the following steps: stirring the sand and the crushed stone for 1-2 minutes, adding the cement, the fly ash, the preservative, the polycarboxylic acid high-efficiency retarding and water reducing agent, the high-efficiency anti-cracking expanding agent microcapsule and the rust inhibitor, and stirring for 3-5 minutes at the speed of 20-30 revolutions per minute.

By adopting the technical scheme, the preparation method is simple, the flow is simplified, and the prepared mass concrete has good corrosion resistance, rust resistance, crack resistance and long-acting durable repairability.

In summary, the present application has the following beneficial effects:

1. the application improves the corrosion resistance, rust resistance, crack resistance and long-term durable repair of mass concrete.

2. This application is through destroying the microcapsule structure for the high-efficient anti expanding agent that splits that is located the microcapsule is released, can regenerate expansibility crystal hydrate this moment under the moisture effect, fills the gap that the concrete cracked, thereby when effectively repairing the concrete that ftractures, can also play the steel bar structure that sealed is located the concrete, reduces the reinforcing bar and leaks outward, thereby has improved the leakproofness and the anticorrosive ability of the concrete of concrete.

3. According to the method, under the action of the surfactant, the efficient anti-cracking expanding agent located in the microcapsule can flow along the crack, so that the newly generated expansive crystal hydrate can not extrude and damage the original protective film barrier layer structure, and meanwhile, the effect of effectively connecting two sides of the crack can be achieved, and a good sealing effect is achieved; meanwhile, the redundant efficient anti-cracking expanding agent flows out of the crack and forms a plug-like blocking structure at the outer wall of the crack; when a maintenance worker carries out daily inspection and maintenance on the concrete, the blocking structure can be found, and therefore the good early warning purpose is achieved.

Detailed Description

The present application will be described in further detail with reference to examples.

The raw materials used in the examples of the present application are all commercially available products, except for the following specific descriptions.

The efficient anti-cracking mut mutexpanding agent is selected from Shenzhen S mut mutexter Engineer GmbH, brand is Duxin, and model is ST-A efficient anti-cracking mut mutexpanding agent (wherein, the main components of the ST-A efficient anti-cracking mut mutexpanding agent are coal gangue, limestone, anhydrite, active activator, magnesium oxide and high molecular cellulose).

The ST-A17 type composite rust inhibitor is selected from Shenzhen Siste industry Co., Ltd, and the brand name is Shuxing ST-A17 type composite rust inhibitor. The ST-A17 type composite rust inhibitor is mainly compounded by inorganic matters (nitrite) and organic matters (amine salt).

The chemical structural general formula of the aminoketone organic rust inhibitor is as follows:

wherein R1 is hydrogen atom, alkane or arene; r2 is hydrogen atom, alkane or arene.

The aminoalcohol rust inhibitor is selected from the aminoalcohol rust inhibitor (produced area; Shandong, with a content of 99% liquid) with a model number of cy-157870 from Shandong Chang Yao new materials Co.

The ST-A18 type preservative is selected from St, Utility Co., Ltd, Shenzhen, brand name is believed ST-A18 type preservative, wherein the ST-A18 type preservative is mainly prepared by using refined naphthalenesulfonate as an initial raw material through the steps of sulfonation, alkali neutralization, formaldehyde condensation and the like.

The HY-400 concrete antiseptic is selected from Beijing technology, high century science and technology, Inc. with model number of HY-400 (origin: Beijing, density of 1.75).

The HK-1 polycarboxylate superplasticizer is selected from HK-1 polycarboxylate superplasticizer manufactured by Kaiweiwa Kaiweiji science and technology Limited.

The HTJS-5 type polycarboxylic acid series high-performance water reducing agent is selected from Beijing Guwei pace up and down materials Co., Ltd, and the model is HTJS-5 type polycarboxylic acid series high-performance water reducing agent (retarding type).

The SPP-PC polycarboxylic acid high-efficiency retarding water reducer is a polycarboxylic acid high-efficiency retarding water reducer which is selected from Xihuassi remote chemical building materials Co., Ltd and has the model of SPP-PC.

The surfactant is selected from monoalkyl phosphate of Wuhan, Inc., pharmaceutical grade (off-white tablet in appearance).

Preparation example

Preparation example 1: a high-efficiency anti-crack expanding agent microcapsule is prepared by the following steps: mixing 5.7kg of ST-A high-efficiency anti-cracking mutexpanding agent and 30 wt% of 1.2kg of cellulose acetate, adding a small amount of water to prepare a paste, and forming high-efficiency anti-cracking mutexpanding agent particles with the average particle size of about 0.1mm by an mutextrusion type granulator;

dissolving 1kg of Polystyrene (PS) as a wall material in 5kg of dichloroethane solution, mixing, stirring to obtain a PS solution, weighing cuprous chloride powder with the average particle size of about 0.1 mu m according to 20% of the mass of the polystyrene, adding the cuprous chloride powder into the PS solution, mixing and stirring to obtain a PS suspension of cuprous chloride; then adding the high-efficiency anti-cracking expanding agent particles and 2kg of oil-in-water type surfactant (monoalkyl phosphate) into the PS suspension of the cuprous chloride; in an inert gas N₂Spray drying in the atmosphere to obtain the high-efficiency anti-cracking expanding agent microcapsule.

Preparation example 2: the difference between the efficient anti-cracking mutexpanding agent microcapsule and the preparation mutexample 1 is that the dosage of the efficient anti-cracking mutexpanding agent and the surfactant of ST-A is different, and the data in the table 1 are specifically referred. In addition, the particle size of the high-efficiency anti-cracking expanding agent particles is 10 mm; the particle size of the cuprous chloride powder was 100. mu.m.

Preparation examples 3 to 5: the difference between the efficient anti-cracking mutexpanding agent microcapsule and the preparation mutexample 1 is that the dosage of the efficient anti-cracking mutexpanding agent and the surfactant of ST-A is different, and the data in the table 1 are specifically referred.

Examples

Example 1: a corrosion-resistant rust-resistant mass concrete for coastal areas comprises the components and the dosage shown in the table 1.

The preparation method comprises the following steps:

stirring the sand and the broken stones for 2 minutes at normal temperature and normal pressure, adding the cement, the fly ash, the preservative, the polycarboxylic acid high-efficiency retarding and water-reducing agent, the high-efficiency anti-cracking expanding agent solution, the rust inhibitor and the high-efficiency anti-cracking expanding agent microcapsules, and stirring for 5 minutes at the speed of 20 revolutions per minute.

Example 2: the difference between the massive concrete for resisting corrosion and rust in coastal areas and the concrete in the embodiment 1 is that: the bulk concrete varies in composition and amount, see table 1 for details.

The preparation method comprises the following steps:

stirring the sand and the crushed stone for 1 minute, adding the cement, the fly ash, the preservative, the polycarboxylic acid high-efficiency retarding and water reducing agent, the high-efficiency anti-cracking expanding agent solution, the rust inhibitor and the high-efficiency anti-cracking expanding agent microcapsule, and stirring for 3 minutes at the speed of 30 revolutions per minute.

Examples 3 to 7: the difference between the massive concrete for resisting corrosion and rust in coastal areas and the concrete in the embodiment 1 is that: the bulk concrete varies in composition and amount, see table 1 for details.

TABLE 1 compositions and amounts (kg) of examples 1-7 in corrosion and rust resistant bulk concrete for coastal areas

Comparative example

Comparative example 1: a coastal area large-volume concrete is different from the concrete of the embodiment 7 in that: the mass concrete does not contain ST-A type efficient anti-cracking mut mutexpanding agent microcapsules, and 22kg of ST-A type efficient anti-cracking mut mutexpanding agent solvent is used.

Comparative example 2: a coastal area large-volume concrete is different from the concrete of the embodiment 7 in that: the large-volume concrete does not contain ST-A type efficient anti-cracking mutexpanding agent and surfactant.

Comparative example 3: a coastal area large-volume concrete is different from the concrete of the embodiment 7 in that: the bulk concrete does not contain ST-A18 type preservatives.

Comparative example 4: a coastal area large-volume concrete is different from the concrete of the embodiment 7 in that: the mass concrete does not contain aminoketone organic rust inhibitor.

Comparative example 5: a coastal area large-volume concrete is different from the concrete of the embodiment 7 in that: the weight (kg) ratio of the ST-A type efficient anti-cracking mut mutexpanding agent solvent to the ST-A type efficient anti-cracking mut mutexpanding agent microcapsule is 3: 1.

Comparative example 6: a coastal area large-volume concrete is different from the concrete of the embodiment 7 in that: the weight (kg) ratio of the ST-A type efficient anti-cracking mut mutexpanding agent solvent to the ST-A type efficient anti-cracking mut mutexpanding agent microcapsule is 1: 2.

Performance detection analysis

Test one: test objects of concrete frost resistance and impermeability: the mass concrete prepared in examples 1 to 7 was used as sample samples 1 to 7, and the mass concrete prepared in comparative examples 2 to 4 was used as control samples 2 to 4.

The test method comprises the following steps: the impermeability grade and the frost resistance grade of the mass concrete standard test piece of 28d age were examined as known from GB 50164 "concrete quality control standard" and "concrete quality control standard GB 50164-92" and registered in table 2.

TABLE 2

	Grade of impermeability	Grade of frost resistance
			Example 1	≥P30	≥D100
Example 2	≥P30	≥D100
			Example 3	≥P30	≥D100
Example 4	≥P30	≥D100
			Example 5	≥P30	≥D100
Example 6	≥P30	≥D100
			Example 7	≥P30	≥D100
Comparative example 2	P4	D50
			Comparative example 3	P4	D50
Comparative example 4	P4	D50

As can be seen by combining examples 1-7 and comparative examples 2-4 with Table 2, the mass concrete standard test pieces prepared in examples 1-7 with the age of 28D all have the impermeability grade of not less than P30 and the freezing resistance grade of not less than D100. Comparative example 2 had a barrier rating of P4 and a freeze resistance rating of D50, control sample 3 had a barrier rating of P4 and a freeze resistance rating of D50, and control sample 4 had a barrier rating of P4 and a freeze resistance rating of D50. It can be seen that the impermeability grade and the impermeability grade of mut mut mutexamples 1 to 7 are both shown in comparative mut mut mutexamples 2 to 4, and at this time, the impermeability and frost resistance of the mass concrete can be effectively improved by adding the ST-a type efficient crack resistant mut mut mutexpanding agent and the surfactant in the formulation of mut mut mutexamples 1 to 7, especially by controlling the amount of the ST-a type efficient crack resistant mut mut mutexpanding agent microcapsule and the ST-a type efficient crack resistant mut mut mutexpanding agent solvent.

And (2) test II: concrete durability test subjects: the mass concrete prepared in examples 1 to 7 was used as sample samples 1 to 7, and the mass concrete prepared in comparative examples 1 to 5 was used as control samples 1 to 5.

The test method comprises the following steps: the corrosion resistance and the rust prevention performance of the mass concrete standard test piece with the age of 28d are detected according to a concrete durability detection method GB/T50082 ordinary concrete long-term and durability, and the detection results are shown in Table 3.

TABLE 3 Performance test results

As can be seen by combining examples 1-7, comparative examples 1-5 and Table 3, the ranges of the dry and wet cycle numbers and the compressive strength corrosion coefficients for the sulfate attack resistance of examples 1-7 are larger than those of comparative examples 1-5, and the dry and wet cycle numbers and the compressive strength corrosion coefficients for the sulfate attack resistance of examples 1-7 are controlled to be between KS 150 and KS 200 and those for examples 1-7 are between 130 and 145. The numerical values of the steel bar corrosion weight loss rate after one year and the steel bar corrosion weight loss rate after three years of the examples 1 to 7 are smaller than the numerical values of the steel bar corrosion weight loss rate after one year and the steel bar corrosion weight loss rate after three years of the comparative examples 1 to 5. Meanwhile, the corrosion weight loss rate of the steel bar is controlled within 0.5% after one year and within 1.5% after three years in examples 1-7. From this, it is found that the durability of mass concrete is affected by the amounts of the ST-A type high-efficiency anti-cracking mut mutexpansive agent, the ST-A18 type antiseptic, the aminoketone organic rust inhibitor and the ST-A type high-efficiency anti-cracking mut mutexpansive agent microcapsule. The durability of the mass concrete can be effectively improved by controlling the dosage of the ST-A type efficient anti-cracking mut mutexpanding agent, the ST-A18 type preservative, the aminoketone organic rust inhibitor and the ST-A type efficient anti-cracking mut mutexpanding agent microcapsule.

Combining mut mut mutexample 7, comparative mut mut mutexample 1 and comparative mut mut mutexample 5, and combining table 3, it can be seen that the durability of mass concrete is directly affected by the presence of ST-a type efficient crack resistant mut mut mutexpanding agent microcapsules, by controlling the weight (kg) ratio of ST-a type efficient crack resistant mut mut mutexpanding agent solvent to ST-a type efficient crack resistant mut mut mutexpanding agent microcapsules to be (2.5-1): the range of 1 can effectively improve the long-term durability of the mass concrete.

As can be seen by combining examples 1-7, comparative example 4 and Table 3, the effect of the amino ketone organic rust inhibitor (the compressive strength corrosion coefficient is 140-145) of examples 4-7 is better than that of examples 1-3. Therefore, after the aminoketone organic rust inhibitor can be inferred to be actually reacted with iron atoms in reinforced concrete to form a stable chelating link, the advantage of effectively enhancing the corrosion resistance of the reinforced concrete is achieved, and the integral durability of the mass concrete is further enhanced.

The specific embodiments are merely illustrative of the present application and are not restrictive of the present application, and those skilled in the art can make modifications of the embodiments as required without any inventive contribution thereto after reading the present specification, but only protected by the patent laws within the scope of the claims of the present application.

Claims

1. The corrosion-resistant and rust-resistant mass concrete for the coastal areas is characterized by being prepared from the following raw materials in parts by weight:

cement of 250 portions and 300 portions;

100 portions of fly ash and 120 portions of fly ash;

20-25 parts of efficient anti-cracking expanding agent;

30-40 parts of a rust inhibitor;

20-30 parts of a preservative;

700 portions of sand and 730 portions of sand;

1000 portions of gravel and 1100 portions of gravel;

10-15 parts of polycarboxylic acid high-efficiency retarding water reducing agent;

100 portions of water and 120 portions of water;

2. The coastal area corrosion-resistant rust-resistant bulk concrete according to claim 1, wherein the cuprous chloride particles have a particle size of 0.1-100 μm, and the high-efficiency crack-resistant expanding agent is particles having a particle size of 0.1-10 mm.

3. The coastal region corrosion-resistant rust-resistant bulk concrete according to claim 2, wherein the method for preparing the high-efficiency crack-resistant expanding agent microcapsule comprises the following steps: dissolving polystyrene serving as a wall material in a dichloroethane solution, mixing to prepare a wall material polymer solution, and dispersing cuprous chloride in the wall material polymer solution to obtain a PS suspension of cuprous chloride; then adding a high-efficiency anti-cracking expanding agent and a water-in-oil type surfactant into the cuprous chloride suspension; and (3) spray drying in inert gas atmosphere to obtain the high-efficiency anti-cracking expanding agent microcapsule.

4. The coastal area corrosion and rust resistant bulk concrete according to claim 3, wherein the rust inhibitor is one or more of a compound rust inhibitor of ST-A17 type, an amino ketone organic rust inhibitor and an amino alcohol rust inhibitor.

5. The coastal region corrosion and rust resistant bulk concrete according to claim 4, wherein the preservative is at least one selected from the group consisting of ST-A18 type preservatives and HY-400 concrete preservatives.

6. The coastal area corrosion-resistant rust-resisting large-volume concrete according to claim 1, wherein the polycarboxylic acid high-efficiency retarding water reducing agent is one or more of HK-1 polycarboxylic acid high-efficiency water reducing agent, HTJS-5 type polycarboxylic acid high-performance water reducing agent and SPP-PC polycarboxylic acid high-efficiency retarding water reducing agent.

7. The coastal region corrosion and rust resistant bulk concrete according to claim 6, wherein the fly ash is selected from class II fly ash.

8. The coastal region corrosion and rust resistant bulk concrete according to claim 7, wherein the cement is selected from P.II 42.5R cement.

9. The process for preparing the corrosion-resistant and rust-resistant mass concrete for the coastal areas as claimed in any one of claims 1 to 8, which is characterized by comprising the following steps: stirring the sand and the crushed stone for 1-2 minutes, adding the cement, the fly ash, the preservative, the polycarboxylic acid high-efficiency retarding and water reducing agent, the high-efficiency anti-cracking expanding agent and the rust inhibitor, and stirring for 3-5 minutes at the speed of 20-30 revolutions per minute.