Admixture for sea sand concrete

Abstract

The invention discloses a concrete additive for hydraulic engineering and belongs to the technical field of hydraulic engineering. The concrete additive includes: 26-32% of a [beta]-sodium naphthalene sulfonate formaldehyde condensate, 22-28% of fatty alcohol-polyoxyethylene ether sodium sulfonate, 6-12% of heavy sodium alkyl benzene sulfonate, 18-22% of polyvinyl alcohol, 10-14% of stearic acid and 4-6% of sulfate. The concrete additive can be applied in sea sand concrete to improve the structure of the sea sand concrete, increases the physical mechanical performances, such as rupture strength, compressive strength and the like, and also improves salt erosion resistance of the sea sand concrete, thereby improving durability and prolonging service life of the sea sand concrete, so that the concrete additive is especially suitable for hydraulic engineering building, such as sea dike and the like.

Description

technical field [0001] The invention belongs to the technical field of water conservancy engineering, and in particular relates to an admixture for sea sand concrete. Background technique [0002] The total length of China's coastline is 32,000 kilometers, including 18,000 kilometers of mainland coastline and 14,000 kilometers of island coastline. There are many harbors and coastal cities dotted around. A large amount of goods trade is shipped by sea. The port throughput increases year by year. Even the construction of seawalls, seaports, and sea-crossing bridges has also increased rapidly. However, at present, as far as the ordinary cement concrete produced in our country is used for roads and buildings, when it is directly used as a marine structure, even the conventional concrete made of fresh water mixed with fresh water sand and gravel, due to long-term erosion by seawater, its physical properties The mechanical index will be reduced and the service life will be greatl...

AI Technical Summary

Problems solved by technology

[0004] Concrete admixture is a substance that is mixed in the process of mixing concrete to improve the performance of concrete. In order to improve the durability of marine engineering buildings, a variety of concrete admixtures have been disclosed, as disclosed in Chinese patent CN 1328203C A series of anti-salt concrete admixtures, including β-naphthalene sulfonate sodium formaldehyde condensate, sodium sulfate, rosin thermal polymer, magnesium powder, alkylbenzene sulfonate, sodium fluorosilicate, etc. Frost resistance, impermeability, corrosion resistance, and prolonging the service life of engineering structures all have good effects, but sea sand, as a concrete material, has special properties, and existing admixtures may not be suitable

Chinese patent application CN 104386985 A discloses a high-strength antifreeze concrete, which is mainly composed of sea sand and gravel, and added polyethylene oxide resin, polypropylene short fiber, polyvinyl alcohol fiber, glycerol, dipropyl Additives such as ethylene glycol, talcum powder, rust inhibitor, sodium benzoate, polyacrylamide, hydroxyethyl cellulose ether, antifreeze and water reducer, the high-strength frost-resistant concrete has high strength and good frost resistance. Long service life, but not corrosion resistant, and the formula is complex

Images