Classification And Properties Of Acid-Resistant Concrete

Acid-resistant concrete can resist the erosion of a variety of acids and most corrosive gases, and is widely used in the chemical industry for acid-proof tanks, electroplating tanks, etc. The acid-resistant concrete developed in my country at this stage includes the following categories:

1. Water glass acid-resistant concrete

1) Introduction

Water glass acid-resistant concrete is made of water glass as cementitious material, sodium fluorosilicate as hardener, and is prepared in a certain proportion with acid-resistant powder and acid-resistant coarse and fine aggregates.

Acid-resistant powder is made of fine grinding of diaquartz, acid-resistant ceramic crushed materials and quartz materials.

Quartzite, diaquartzite, andesite, basalt, cast stone, etc. are commonly used in acid-resistant coarse and fine aggregates.

The mix ratio of water glass acid-resistant concrete is generally water glass: acid-resistant powder: acid-resistant fine aggregate: acid-resistant coarse aggregate = 0.6~0.7:1:1:1:1.5~2.0.

The curing temperature of water glass acid-resistant concrete shall not be less than 10℃ and the curing time shall not be less than 6 days.

2) Performance

It has strong acid resistance and can withstand the corrosion of various concentrations of triacid, chromic acid, acetic acid (except hydrofluoric acid, thermal phosphoric acid, fluorosilicate) and organic solvents.

High mechanical strength. The compressive strength reaches about 20MPa.

Resistant to high temperature (600℃~800℃) and hot and cold rapid change.

Not resistant to alkaline erosion.

2. Sulfur acid-resistant concrete

1) Introduction

Sulfur acid-resistant concrete uses sulfur as the gelling material and polysulfur rubber as the toughening agent, and is mixed with acid-resistant powder and fine aggregate, and boiled into sulfur mortar after heating (160-170℃). After cooling, it is sulfur acid-resistant concrete.

2) Performance

It has a compact structure, fast hardening, anti-seepage, water, dilute acid resistance, most inorganic acids, neutral salts and acid salts, and has high strength.

Convenient construction and no maintenance is required, especially suitable for emergency repair projects.

It has poor wear resistance and fire resistance, is relatively brittle, has a high shrinkage, and is prone to cracks and drumming. It is not suitable for parts with temperatures above 90℃, as well as open flame contact, alternating hot and cold, drastic temperature changes, and directly withstand impacts.