阅读说明：本技术 一种海工抗冲磨耐氯盐侵蚀混凝土 (Marine engineering anti-abrasion chloride-corrosion-resistant concrete ) 是由 陈晓润 王军 赵日煦 张恒春 黄汉洋 刘凯 于 2019-11-25 设计创作，主要内容包括：本发明公开了一种海工抗冲磨耐氯盐侵蚀混凝土,由水泥、陶瓷粉、超细矿粉、碎石、河砂、聚羧酸高效减水剂和水按比例配制而成。本发明选用抗冲磨性能优良的花岗岩等碎石,并实现碎石骨料含量的最大化,有效提高混凝土的抗冲磨性能；采用陶瓷粉作为掺和料,在提高水泥浆体抗冲磨性能的同时,利用其后期发生二次水化反应生成的水化铝酸钙吸附氯离子,抑制氯离子向内传输,减少钢筋锈蚀；同时,采用超细矿粉作为掺和料,提高浆体-骨料界面粘结力并降低浆体孔隙率,提高混凝土抗冲磨性能的同时抑制侵蚀离子向内传输,减少钢筋锈蚀。本发明所制得的海工抗冲磨耐氯盐侵蚀混凝土具有高抗挟砂浪涌冲刷和高抗氯离子侵蚀的性能,具有重要的工程应用价值。(The invention discloses a marine anti-erosion and anti-corrosion concrete against chloride salt, which is prepared from cement, ceramic powder, superfine mineral powder, broken stone, river sand, polycarboxylic acid high-efficiency water reducing agent and water in proportion. According to the invention, granite and other gravels with excellent abrasion resistance are selected, the maximization of the aggregate content of the gravels is realized, and the abrasion resistance of concrete is effectively improved; ceramic powder is used as a blending material, so that the erosion and abrasion resistance of the cement paste is improved, and meanwhile, chloride ions are adsorbed by using hydrated calcium aluminate generated by secondary hydration reaction at the later stage, the inward transmission of the chloride ions is inhibited, and the corrosion of reinforcing steel bars is reduced; meanwhile, the superfine mineral powder is used as a blending material, so that the bonding force of a slurry-aggregate interface is improved, the porosity of the slurry is reduced, the erosion and abrasion resistance of concrete is improved, meanwhile, the inward transmission of erosion ions is inhibited, and the corrosion of reinforcing steel bars is reduced. The marine abrasion-resistant chloride corrosion-resistant concrete prepared by the invention has high sand-holding surge erosion resistance and high chloride ion erosion resistance, and has important engineering application value.)

1. The marine anti-abrasion chloride salt erosion resistant concrete is characterized by comprising the following components in parts by weight: 180-260 kg/m cement ³60-100 kg/m of ceramic powder ³80-130 kg/m of superfine mineral powder ³1000-1200 kg/m of crushed stone ³720-800 kg/m river sand ³And a water reducing agent of 7 to 11kg/m ³110 to 140kg/m of water ³。

2. The marine abrasion-resistant chloride corrosion-resistant concrete according to claim 1, wherein the cement is P.O42.5 or PII42.5 Cement having a specific surface area of 350m or less ²/kg。

3. The marine abrasion-resistant chloride corrosion-resistant concrete according to claim 1, wherein the specific surface area of the ceramic powder is 400-500 m ²Per kg; wherein, the chemical components and the mass percentage thereof comprise: 1-2% of CaO, and SiO ₂60～70％，Al ₂O ₃20～30％，MgO2～3％，SO ₃2～3％。

4. The marine abrasion-resistant chloride corrosion-resistant concrete according to claim 1, wherein the specific surface area of the ultrafine mineral powder is 700-900 m ²Per kg; wherein, the chemical components and the mass percentage thereof comprise: 35-40% of CaO and SiO ₂25～30％，Al ₂O ₃15～20％，MgO5～10％，SO ₃2～5％。

5. The marine abrasion-resistant chloride corrosion-resistant concrete according to claim 1, wherein the crushed stone is granite, basalt or quartzite crushed stone with 5-25 mm continuous gradation, and the crushing value is less than or equal to 5%.

6. The marine abrasion-resistant chloride corrosion-resistant concrete according to claim 1, wherein the river sand is medium coarse sand, the fineness modulus is 2.3-3.0, and the mud content is less than or equal to 0.5 wt%.

7. The marine abrasion-resistant chloride corrosion-resistant concrete according to claim 1, wherein the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent, and the water reducing rate is not less than 25%.

8. The marine abrasion-resistant chloride corrosion-resistant concrete according to claim 1, wherein the 28d compressive strength is not less than 65MPa, the 28d abrasion-resistant strength is not less than 0.8h/cm, and the 56d chloride diffusion coefficient is not more than 1.5 x 10 ^-12m ²/s。

9. The marine abrasion-resistant chloride corrosion-resistant concrete according to claim 1, applied to a marine concrete structure in a splash zone.

Technical Field

The invention belongs to the field of building materials, and particularly relates to marine anti-abrasion chloride-corrosion-resistant concrete and a preparation method thereof.

Background

The bridge pier column in the marine environment is corroded by chlorine salt for a long time and simultaneously can be subjected to scouring action of sand-carried surge. Under the erosion and abrasion action of sand-carrying surge, the concrete protective layer of the pier has the phenomena of thickness reduction, surface damage and the like, so that the path of chloride ions permeating into the structure is shortened, and the corrosion of reinforcing steel bars is accelerated. Meanwhile, the concrete protective layer cracking caused by the corrosion of the steel bars can further aggravate the corrosion of chloride and the erosion abrasion, and the normal use and the safe operation of the bridge are influenced. Therefore, when the mix proportion of the marine concrete is designed, the chlorine ion penetration resistance and the impact resistance and the wear resistance of the concrete are comprehensively considered.

At present, marine concrete is usually modified and designed aiming at the chloride ion permeability resistance, the sulfate erosion resistance, the impermeability and the like, and the synergistic design aiming at the chloride ion permeability resistance and the abrasion resistance is lacked; further exploring the marine anti-abrasion and chloride corrosion resistant concrete, and having important research and application significance.

Disclosure of Invention

The invention mainly aims to provide marine engineering anti-abrasion chloride-erosion-resistant concrete aiming at the defects of the existing marine engineering concrete, which has excellent anti-abrasion performance and anti-chloride ion permeability, can effectively ensure the service performance and durability of the marine engineering concrete, and the related preparation method is simple and is suitable for popularization and application.

In order to achieve the purpose, the invention adopts the technical scheme that:

marine engineering erosion-resistant and abrasion-resistant chlorine salt erosion-resistant materialThe concrete comprises the following components in parts by weight: 180-260 kg/m cement ³60-100 kg/m of ceramic powder ³80-130 kg/m of superfine mineral powder ³1000-1200 kg/m of crushed stone ³720-800 kg/m river sand ³And a water reducing agent of 7 to 11kg/m ³110 to 140kg/m of water ³。

In the scheme, the cement is P.O42.5 or P.II42.5 cement, and the specific surface area is less than or equal to 350m ²/kg。

In the scheme, the specific surface area of the ceramic powder is 400-500 m ²Per kg; wherein, the chemical components and the mass percentage thereof comprise: 1-2% of CaO, SiO ₂60～70％，Al ₂O ₃20～30％，MgO 2～3％，SO ₃2～3％。

In the scheme, the specific surface area of the superfine mineral powder is 700-900 m ²Per kg; wherein, the chemical components and the mass percentage thereof comprise: 35-40% of CaO and SiO ₂25～30％，Al ₂O ₃15～20％，MgO 5～10％，SO ₃2～5％。

In the scheme, the crushed stone is granite, basalt, quartzite and other crushed stones with 5-25 mm continuous gradation, and the crushing value is less than or equal to 5%.

In the scheme, the river sand is medium coarse sand, the fineness modulus is 2.3-3.0, and the mud content is less than or equal to 0.5 wt%.

In the scheme, the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent, and the water reducing rate is more than or equal to 25 percent

The marine concrete obtained according to the scheme has the 28d compressive strength of more than or equal to 65MPa, the 28d impact and abrasion resistance strength of more than or equal to 0.8h/cm and the 56d chloride ion diffusion coefficient of less than or equal to 1.5 multiplied by 10 ^-12m ²S; is suitable for marine concrete structures such as splash zones and the like.

The principle of the invention is as follows:

compared with the prior art, the invention has the beneficial effects that:

1) according to the invention, the ceramic powder is filled in the cement slurry as the micro-aggregate, so that the anti-impact grinding strength of slurry components in the concrete is effectively improved, and further, the anti-impact grinding strength of the whole concrete is improved; meanwhile, aluminate generated in the process of secondary hydration reaction of the ceramic powder can effectively combine more chloride ions, and the diffusion coefficient of the chloride ions in the concrete is further reduced.

2) The added superfine mineral powder can participate in secondary hydration reaction to a greater extent to generate more calcium silicate hydrate with physical adsorption to chloride ions and calcium aluminate hydrate with chemical adsorption to the chloride ions, and the aperture is refined, the compactness of the concrete is improved, and therefore the diffusion rate of the chloride ions to the interior of the concrete is delayed; meanwhile, the improvement effect of the superfine mineral powder on the slurry-aggregate interface structure reduces the possibility that the aggregate falls off from the concrete matrix, thereby improving the abrasion resistance of the concrete.

3) According to the invention, a cement-ceramic powder-superfine mineral powder ternary cementing material system is adopted, ceramic powder with smaller fineness is filled in gaps among cement particles, and superfine mineral powder with smaller fineness is filled in gaps among ceramic powder particles to obtain tightly-packed powder, and further secondary hydration and interface improvement effects of the ceramic powder and the superfine mineral powder are combined, so that the anti-abrasion performance and the anti-chloride ion permeability of hardened cement slurry in concrete are effectively improved, the anti-abrasion strength of the obtained concrete is further improved, and the chloride ion diffusion coefficient is reduced.

4) The invention adopts the granite, basalt, quartzite and other broken stone aggregates with high dosage and good abrasion resistance, and can further improve the abrasion resistance strength and the chloride ion permeation resistance of the concrete while ensuring the mechanical property.

Compared with the prior art, the invention has the beneficial effects that:

1) according to the invention, by introducing the ceramic powder, the superfine mineral powder and the anti-abrasion crushed stone with a large mixing amount into the marine concrete, the marine concrete has excellent anti-abrasion performance and anti-chloride ion permeability while ensuring the mechanical property, and the service performance and durability of the marine concrete are effectively ensured.

2) The raw materials related by the invention have simple sources, and the preparation process is simple and convenient, and is suitable for popularization and application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the following examples, the cement used was P.O42.5 or P.II42.5 cement, and the specific surface areas were 348m each ²/kg and 329m ²Per kg; the ceramic powder is ceramic polishing powder generated in the grinding and polishing processes of the ceramic tile, and the specific surface area is 480m ²Per kg, 1.48 wt% CaO in the chemical composition, SiO ₂63.77 wt% of Al ₂O ₃26.34 wt% of MgO, 2.53 wt% of SO ₃The content was 2.44 wt%; the specific surface area of the adopted superfine mineral powder is 800m ²Per kg, having a chemical composition of 37.17 wt% CaO, SiO ₂29.62 wt% of Al ₂O ₃16.87 wt%, MgO 9.99 wt%, SO ₃The content was 3.38 wt%.

The crushed stone is granite or basalt crushed stone with 5-25 mm continuous gradation, and the crushing value is 4%; the river sand is medium coarse sand, the fineness modulus is 2.85, and the mud content is 0.4 wt%.

The water reducing rate of the adopted polycarboxylic acid high-efficiency water reducing agent is 25 percent.

In the following examples, GB/T50081-2002 Standard for testing mechanical properties of ordinary concrete is adopted to carry out a compressive strength test; carrying out an anti-impact abrasion strength test by adopting an air sand gun method in DL/T5150-2017 'Hydraulic concrete test regulations', wherein the air pressure is 0.6 MPa; the GB/T50082-2009 Standard test method for testing the long-term performance and the durability of the common concrete is adopted to carry out the chloride ion diffusion coefficient test.