Classification and performance of acid-resistant concrete

Acid-resistant concrete can resist the corrosive effects of a variety of acids and most corrosive gases, and is widely used in acid-proof tanks and electroplating tanks in the chemical industry. 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 cementing material, sodium fluorosilicate as hardening accelerator, and acid-resistant powder and acid-resistant coarse and fine aggregates in a certain proportion.

①The acid-resistant powder is made of diabase, acid-resistant ceramic scraps, and quartz materials.

② Acid-resistant coarse and fine aggregates are commonly used in quartzite, diabase, andesite, basalt, cast stone, etc.

③. The mixing ratio of water glass acid-resistant concrete is generally water glass: acid-resistant powder: acid-resistant fine aggregate: acid-resistant coarse aggregate = 0.6～0.7:1:1:1.5～2.0.

④The curing temperature of sodium silicate acid-resistant concrete is not less than 10℃, and the curing time is not less than 6 days.

2. Performance

① Strong acid resistance, can withstand various concentrations of tri-acid, chromic acid, acetic acid (except hydrofluoric acid, hot phosphoric acid, fluorosilicic acid) and organic solvents and other media corrosion.

②High mechanical strength. The compressive strength is about 20MPa.

③Resistant to high temperature (600℃～800℃) and rapid changes in heat and cold.

④Not resistant to alkali corrosion.

2. Sulfur acid-resistant concrete

1 Introduction

Sulfur and acid-resistant concrete is made of sulfur as the cementing material, polysulfide rubber as the toughening agent, mixed with acid-resistant powder and fine aggregate, heated (160～170℃) to make sulfur mortar, and poured into acid-resistant coarse aggregate After cooling, it becomes sulfur acid-resistant concrete.

2. Performance

①Compact structure, fast hardening, impermeability, water resistance, dilute acid resistance, resistance to most inorganic acids, neutral salts and acid salts, and high strength.

②Convenient construction, no maintenance required, especially suitable for emergency repair projects.

③Poor abrasion resistance, fire resistance, brittle properties, high shrinkage, cracks and bulging are easy to appear, it is not suitable for the parts where the temperature is higher than 90 ℃, open flame contact, alternating cold and heat, rapid temperature changes and direct impact.

Understanding the classification of acid-resistant concrete can provide practical guidance for the selection and use of concrete in engineering. I hope the above introduction can help you.