What is the cementitious material? What is Cementitious Material?

Cementitious materials science is a branch of materials science, which refers to the theoretical science that studies the composition, structure and properties of cementitious materials. Cementitious material, also known as cementitious material. Under the physical and chemical action, it can change from a slurry to a solid stone-like body, and can cement other materials to make a composite solid substance with certain mechanical strength.

The development of cementitious materials has a long history, and people used the earliest cementitious material, clay, to plaster simple buildings. The building materials such as cement that appeared then have a lot to do with cementitious materials. Moreover, cementitious materials have some excellent properties and are widely used in daily life.

With the development of cementitious material science, the cementitious materials and their products industry will surely make a new leap. The hydration hardening mechanism of cementitious materials and the ways to improve the structure and properties of hardened materials were introduced. The production and application technology of gypsum, lime and magnesia cementitious materials, as well as the composition and characteristics of mixed materials are also introduced in detail.

Some hydrophilic polymer solutions, such as gelatin aqueous solution and agar aqueous solution, are viscous flowing liquids under warm conditions, and when the temperature decreases, the polymer solution forms a network structure, and the dispersed medium water is contained in the network structure, forming a non-flowing semi-solid, this process is called gelling. or the process by which a solution is transformed into a gel (gelatin) under appropriate conditions. It can be regarded as a stage in the process of sol aggregation and precipitation.

When gelling, the colloidal body loses its coalescence stability, but still has kinetic stability, and it is a special semi-solid state, and the colloidal particles are connected to each other to form a network structure, and the structural voids are filled with liquid, and no precipitation is generated. When the shape of the colloidal particle is asymmetrical and the hydrophilicity is strong, gelling can occur under the action of strong electrolyte. Hydrophobic sols coalesce and settle under the action of electrolytes, but no gel is obtained.

In the chemical system, it is used to manufacture various silicate products such as silica gel, silica, zeolite molecular sieve, sodium metasilicate pentahydrate, silica sol, layer silica and instant powdered sodium silicate, potassium sodium silicate, etc., which are the basic raw materials for silicon compounds. In economically developed countries, the deep-processing series of products with sodium silicate as raw material have developed to more than 50 kinds, some of which have been used in high-tech, precise and cutting-edge science and technology fields; In light industry, it is an indispensable raw material in detergents such as laundry detergent and soap, as well as a water softener and sedimentation agent; used in the textile industry for dyeing, bleaching and sizing; It is widely used in the machinery industry for casting, grinding wheel manufacturing and metal preservatives, etc.; In the construction industry, it is used to manufacture fast-drying cement, acid-resistant cement waterproof oil, soil curing agent, refractory materials, etc.; In agriculture, silicon fertilizer can be manufactured; In addition, it is used as a silicon-aluminum catalyst for petroleum catalytic cracking, a filler for soap, an adhesive for corrugated paper, a high-temperature resistant material such as a laboratory crucible, a metal preservative, a water softener, a detergent additive, a refractory and a ceramic raw material, a bleaching, dyeing and slurry for textiles, a mine beneficiation, waterproofing, leak plugging, wood fire prevention, food antiseptic and adhesive making. Lime is hardened by drying crystallization and carbonization, due to the low carbon dioxide content in the air, and the calcium carbonate hard shell formed after carbonization prevents carbon dioxide from penetrating inward, and also prevents water from evaporating outward, so the hardening is slow, and the strength after hardening is not high, 1:

The compressive strength of 3 lime mortar for 28 days is only MPa. When in a humid environment, the water in the lime does not evaporate, carbon dioxide cannot penetrate, and the hardening will stop; In addition, calcium hydroxide is easily soluble in water, and the hardened lime will dissolve and collapse when exposed to water. Therefore, lime should not be used in long-term humid and water-soaked environments.

cementitious material. It refers to the ability to remove loose materials (such as sand and stone) or blocks in construction projects.

Materials (e.g. bricks, tiles, etc.) are cemented into a monolithic material.

Hydraulic cementitious materials refer to those that can not only harden in air, but also better in water, maintain and continue to develop their strength, such as the most typical is all kinds of cement.

Cement is in powder form, mixed with water, and can be made of plastic pulp through a physicochemical process.

The body becomes a hard stony body, and can cement the bulk material into a whole, which is a good mineral cementitious material. Cement not only hardens in air, but also hardens better in water.

chemical, maintain and develop strength, so cement belongs to the hydraulic cementitious material, it can be used.

Works above ground, underground, and in water.

Cement was the first cement patent granted in 1824 by the British engineer Aspdih, marking the invention of cement. The invention of cement provided a material basis for the development of construction engineering, which developed from land engineering to water and underground engineering. There has been one invention of cement so far.

With a history of more than 100 years, it has always been the most widely used and most used cementitious material.

It mainly refers to cement, stone, fly ash and other materials that play a cementing role in concrete, called cementitious materials.

According to cementitious concrete, concrete can be divided into cement concrete, gypsum concrete, asphalt concrete, polymer concrete, resin concrete, water glass concrete, etc.

Extended Materials. Concrete, for short"Concrete (tóng).": refers to the general term of engineering composite materials that cement aggregates into a whole by cementitious materials.

The word concrete usually refers to the use of cement as cementitious material, sand and stone as aggregates; Cement concrete, also known as ordinary concrete, is widely used in civil engineering engineering when it is mixed with water (which can contain admixtures and admixtures) in a certain proportion and is mixed to obtain cement concrete.

Cementitious materials can be divided into two categories: inorganic cavity materials and organic cementitious materials. The cavity materials of the machine are mineral cementitious materials, including cement, stone, gypsum, magnesia cementitious materials, water glass, sulfur, etc.; Organic cementitious materials include asphalt, resins, and polymers.

Inorganic cementitious materials can also be divided into air-hard and hydraulic ceramics. Gas-hardened cementitious materials can only harden in air and maintain or continue to grow in strength for a long time, such as stone squirts.

Gypsum, magnesia glue materials, water glass, etc. Hydraulic materials can not only harden in air, but also better harden in water, maintaining the strength of the well to continue to grow, such as Portland cement, slag cement, mountain gray cement, etc.

1) Inorganic cementitious material concrete, inorganic cementitious material concrete includes lime siliceous cementitious material mixed aldehyde.

Such as Portland concrete), Portland cement concrete.

Such as Portland cement, ordinary cement, slag cement, fly ash cement, pozzolana cement, early strength cement concrete, etc.).

Calcium-aluminum-cemented concrete.

Such as high borrowed cement, pure aluminate cement, shotcrete cement, super-speed hard cement concrete, etc.), right gypsum concrete, magnesia cement concrete, sulfur concrete, sodium fluorosilicate concrete, residual concrete.

Use metal instead of cement as cementing material

Wait. The concrete referred to in this machinery network is generally Portland cement concrete.

2) Organic dirty concrete. Organic muddy material concrete mainly includes oyster green concrete and polymer cement concrete, resin concrete, polymer impregnated concrete, etc.

In addition, inorganic and organic composite colloidal material concrete can also be divided into polymer cement concrete and polymer indigo concrete.

At present, there are three kinds of concrete general rubber materials: cement, coal ash and mineral powder.

Concrete cementitious materials include cement, lime powder and other active materials involved in cement hydration, according to the different composition of materials, concrete materials can also be divided into organic and inorganic two categories. 2. Cementitious materials refer to substances with great strength that are synthesized into very strong substances through stirring and mixing in building materials, which are called cementitious materials. The classification of cementitious materials can be divided into two categories:

Hydraulic cementitious materials, also known as cement, and rigid cementitious materials.

Cementitious material, also known as cementitious material. Under the action of physics and chemistry, it can change from slurry to solid stone, and other materials can be cemented into a composite solid with certain mechanical strength through cement.

Cementitious materials can bond granular or block materials into a whole material in the process of turning plastic paste into hard stone through their own physical and chemical action.

In building materials, through a series of physical and chemical actions, cement slurry can be changed to solid stone, and other solid cementitious materials can be cemented into monolithic materials with certain mechanical strength.