Expansive cement can expand to a specific volume during the hydration process, while silicate cement often shrinks during the hardening process, causing cracks and water permeability in cement components. Thus, expanding cement overcomes the shortcomings mentioned above of silicate cement and improves the compactness and integrity of cement concrete components. When expansive cement is used […]
Hydroxypropyl methylcellulose (HPMC) is a nonionic cellulose alkyl hydroxyalkyl mixed ether obtained by alkalization, etherification, neutralization, and washing of cellulose. As a nonionic cellulose mixed ether with excellent performance, HPMC has good dispersing, emulsifying, thickening, bonding, water retention, and glue retention properties like other cellulose ethers such as CMC, MC, HEC, CMHEC, HEMC, and HBMC. […]
Any aluminate cement clinker, mainly composed of calcium aluminate, is ground into a hydraulic cementing material called aluminate cement, and its code name is CA. According to needs, an appropriate amount of αAl₂O₃ powder can be added when grinding cement with an Al₂O₃ content greater than 68%. Aluminate cement can be divided into four categories […]
Synthetic resins and plastics Because methylcellulose has excellent dispersibility, it has been used in the suspension polymerization of vinyl chloride since the late 1950s, and small and uniform granular polyvinyl chloride can be obtained. For example, if a water-soluble MC with a viscosity of 500mPa·s is used in the polymerization of vinyl chloride, it can […]
Six widely used cements are silicate cement,ordinary silicate cement,slag silicate cement,pozzolanic silicate cement,fly ash silicate cement, and composite silicate cement. When cement components are used in cement mortar formula design, the corresponding cement varieties should be selected according to the specific performance requirements of cement mortar and the environmental conditions. The precautions are as follows. （1）Rest assured, […]
Methylcellulose has the characteristics of toughness, flexibility, transparency, and adhesiveness, as well as its compatibility with common textile sizing agents and modifiers, making it suitable for warp sizing and fabric glazing. For example, 2.5% water-insoluble MC is dissolved in 5% NaOH aqueous solution to treat fabrics. After removing excess water, the fabric is coagulated with […]
The composition of silicate series cement can be categorized into raw materials for producing silicate cement clinker, gypsum, and mixed materials. (1) Composition materials of silicate series cement clinker Silicate series cement clinker comprises lime raw materials, clay raw materials, and iron ore powder. The lime raw materials are natural limestone, tuff and shells, which […]
Imagine a construction project where stones, sand, and masonry are magically transformed into a solid structure. This transformation is made possible by a fascinating process known as cementitious materials, a combination of physical and chemical reactions. These materials, classified into two categories based on their chemical composition, play a crucial role in construction. Inorganic cementitious […]
The previous section introduced the general physical properties of methylcellulose. Other performance indicators include methoxy content, viscosity, moisture, ash (in terms of sulfate), chloride (in terms of NaCl), alkalinity (in terms of NaOH), iron content, heavy metal (in terms of lead) acid esters, and relative density. The initial application of MC hinges on its water […]
The preparation of MC is to react cellulose with an alkali solution to generate alkali cellulose and then respond with methyl chloride under a certain pressure and temperature to obtain a crude product, which is separated, washed, dried, pulverized, and packaged to get the product. The preparation methods include the gas phase method, liquid phase […]
