In the selection of aggregates used for building mortar, the following factors need to be taken into account. (1). Particle Size Gradation The effect of aggregate on the workability of mortar depends on the water absorption rate, fineness and gradation of aggregate. The larger the water absorption rate of aggregate is, the greater the water.. read more →
Since masonry cement is mainly used for the preparation of building mortar, it places requirements on the water retention, not less than 80%. The water retention of mortar refers to the weight of the water retained after water absorption treatment, expressed in the mass percent of original water amount. read more →
Masonry cement is characterized by the high admixture content, low cement strength and low cement cost. Since the strength grade of mortar is generally low, using ordinary Portland cement or other varieties of Portland cement often results in higher strength of mortar, a greater waste of cement, and poor water retention of mortar. Using masonry.. read more →
Gypsum is widely used in the construction materials industry: (1) Use gypsum as a cementitious material for the preparation of gypsum-based mortar, such as wall plaster, adhesive plaster and gypsum-based self-leveling mortar; (2) Use gypsum for the processing and production of gypsum products, mainly including paper-faced plasterboard, fiber plasterboard and decorative plasterboard. The plasterboard has.. read more →
The addition of lime into the cement mortar can improve the workability and construction performance, improve the bonding strength, reduce cracking and compensate for micro-cracks. When the dosage of lime paste is small, it has little effect on the strength of mortar, but when the dosage of lime paste is great, it will significantly reduce.. read more →
Building gypsum has the following properties: Fast setting and hardening Building gypsum has fast setting and hardening speed. Usually, it achieves the initial setting within a few minutes at room temperature after mixing with water, and reaches the final setting within 30min. The setting time can be adjusted by adding retarders or coagulants. .. read more →
In the construction work, lime is mainly used for masonry wall or plastering work. The lime paste is used as a water-retaining thickening material, with such advantages as good water retention and low price, effectively avoiding the poor adhesion between the mortar and the substrate or the block material resulting from the water absorption of.. read more →
Unlike traditional mortar, ready-mixed mortar not only requires certain strength, but more importantly requires good water retention, adhesion, workability and so on. In order to ensure good workability of mortar, it is necessary to add water retention thickening materials into mortar, such as cellulose ethers, thickening powder, plasticizers, etc. Since wet-mixed mortar is transported to.. read more →
Building mortar is a functional material and usually constitutes a whole together with the substrate. For example, masonry mortar makes brick, building block and other bulk materials bonded as a whole to bear the load together; plastering mortar is painted on the surface of substrate, playing a role in protecting the substrate and resisting external.. read more →
The mud content refers to the content of particles with a nominal particle size of less than 80μm in the aggregate. The clay lump content refers to the content of particles with a nominal particle size of greater than 1.25mm in sand but less than 630μm after washed and pinched. The mud particles.. read more →