The fine aggregates used for building mortar include natural sand and artificial sand. Natural sand refers to the rock particles with a nominal particle size less than 5. 00mm formed under the natural conditions, and is divided into river sand, sea sand and mountain sand according to different sources. Artificial sand refers to the rock.. read more →

The aggregate is a component in the mortar with the largest dosage and the lowest cost. It has relatively good volume stability and high strength. Some aggregates also have good thermal insulation properties. The performance of aggregate can affect the effects of other components. Therefore, the rational use and giving full play to aggregate are.. read more →

The air-entraining agent can bring in a lot of evenly distributed, stable and closed tiny bubbles in the process of mortar mixing and stirring. The addition of air-entraining agent into mortar can significantly improve the workability of slurry and enhance the impermeability and frost resistance of hardened mortar. Although the dosage of air-entraining is small,.. read more →

The air-entraining agents are surfactants and can be divided into anionic, cationic, nonionic and amphionic types. The more widely used are anionic surfactants. The commonly used are the following categories:   . Rosin-based Air-entraining Agents Rosin-based air-entraining agents are produced by the reaction and polycondensation of rosin or the saponified product of rosin acid with.. read more →

A defoamer or an anti-foaming agent is a surfactant that suppresses or eliminates foam, with good chemical stability. It should have lower surface tension than the medium to be defoamed, a certain compatibility with the medium to be defoamed, and good dispersion. An effective defoamer can not only quickly break foams, but also can prevent.. read more →

What are the varieties of retarders? According to the chemical compositions, retarders can be divided into two categories, organic retarders and inorganic salt retarders. The organic retarder is a more widely used category of retarder. Common varieties are hydroxyl carboxylic acids and their salts (such as tartaric acid, sodium tartrate, potassium tartrate, citric acid, etc.,.. read more →

Some mortar also requires to have various functions. For example, the self-leveling mortar also requires high early strength, small shrinkage and wear resistance, in addition to the requirements for good flow properties, automatic flowing and leveling, which then which requires the addition of different additives to meet its requirements.   For wet-mixed mortar, the manufacturing.. read more →

In ready-mixed mortar, an appropriate water-retaining and thickening material is usually added, but the water-retaining and thickening material has a stronger water requirement, thus increasing the unit water consumption, also affecting the mechanical properties and durability of mortar, so an appropriate amount of water-reducing agent should be used for the dispersion of cement slurry system… read more →

At present, the more widely used water-reducing agents are lignin-basedwater-reducing agents naphthalene-based superplasticizers, melamine-based superplasticizers and polycarboxylate-based superplasticizers. And their characteristics are as follows: Lignin-basedWater-reducing Agents Lignin-basedwater-reducing agents have lignin sulfonates as the major components, including calcium lignosulphonate, sodium lignosulphonate and magnesiumlignosulphonate, and are ordinary water-reducing agents. They do not have high water-reducing rate, and.. read more →

Since slag powder differs greatly from fly ash and silica fume in the chemical composition and particle morphology, it exhibits different behaviors and plays different roles in cement concrete.   Water Demand It is generally believed that slag powder has little effect on the water demand. In the chemical composition and mineral composition, slag powder.. read more →