Sea sand anti-corrosion marine concrete and preparation method thereof

Abstract

The invention discloses sea sand anti-corrosion marine concrete. By adjusting the proportion of binding materials, cement, mineral powder, silicon ash and fly ash micro-spheres are uniformly distributed, and adsorption of corrosive ions is increased by hydration reaction of high-aluminum minerals and chemical curing of Cl- ions in sea sand. Transmission paths of the Cl- ions in the sea sand and the corrosive ions in a marine environment can be effectively inhibited by pore structure adjustment and corrosive ion transmission inhibitors, and reinforcing steel corrosion is decreased. Micro-expansion and water retention components in internal maintenance materials can effectively avoid cracking of the inside of the concrete due to excessive shrinkage under the moisture coupling action of a marine environment, and the working performance and the compactness of the concrete can be improved by special ball effects of ultra-dispersed shrinkage additives and the fly ash micro-spheres. The sea sand anti-corrosion marine concrete can effectively solve the problem of river sand resource shortage, resource application of the sea sand is realized, and the sea sand anti-corrosion marine concrete more effectively serves a severe marine environment and has an important engineering application value.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a sea sand corrosion-resistant marine concrete and a preparation method thereof. Background technique [0002] River sand is the main source of construction sand, but the supply of river sand is limited by factors such as resources and environmental influences, and cannot fully meet the needs of construction. With the continuous expansion of my country's construction scale, many large-scale infrastructure constructions such as cross-sea and cross-river are being carried out day by day. The demand for construction sand in the construction industry continues to increase, and river sand resources are increasingly scarce, forcing people to shift their attention to rich reserves. on the sea sand. Aiming at the construction of large-scale cross-sea bridges in the humid and high-temperature environment in coastal areas, they are subject to seawater erosion, wave splashing a...

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Problems solved by technology

Under the coupling effect of multiple factors, the internal structure of concrete is damaged, the gelling force is degraded, and the corrosion rate of steel bars is increased, which makes the engineering structure fail prematurely, and the service life cannot reach the designed service life, resulting in huge economic losses.

[0003] At present, the use of abundant sea sand to prepare corrosion-resistant marine concrete faces the following problems: (1) Cl in seawater - The ion content is high, so sea sand contains a large amount of chloride salt, the presence of chloride salt in sea sand, free Cl - Ions act as catalysts in the electrochemical corrosion process of steel bars, which will thin the alkaline passivation film on the surface of concrete steel bars, promote the corrosion of steel bars, and reduce the durability of concrete; (2) light substances such as shells are often in the form of thin slices Shape, smooth surface, low strength, easy to crack along joints, and poor bonding ability with cement slurry

When the content of light substances such as shellfish is high, the workability of concrete will be significantly deteriorated, and the mechanical properties and durability of concrete will be reduced; Under the coupling effect of dry-wet and salt spray, the diffusion rate of erosive ions in seawater is accelerated, which accelerates the corrosion of steel bars and degrades the cementing ability of concrete

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