Pozzolanic Portland cement, also known as volcanic ash cement and designated as P·P, is a type of hydraulic cement made by grinding together Portland cement clinker, 20–50% volcanic ash materials (such as volcanic ash, tuff, pumice, zeolite, diatomite, fly ash, burned clay, shale, coal gangue, etc.), and an appropriate amount of gypsum. According to Chinese standards, the proportion of volcanic ash in the mix must be between 20% and 50% by weight. It is also allowed to replace up to one-third of the total blended materials with granulated blast furnace slag, provided that the volcanic ash content remains at least 20%.
This type of cement is available in five strength grades: 275, 325, 425, 525, and 625. Compared to ordinary Portland cement, pozzolanic cement has a lower specific gravity, generates less heat during hydration, exhibits better resistance to chemical corrosion, and requires less water to achieve a certain level of fluidity. However, it tends to have higher drying shrinkage and lower frost resistance. Its early strength development is slower, but its long-term strength increases more rapidly over time. The performance of this cement is significantly influenced by environmental conditions, especially humidity, which helps accelerate strength gain.
Due to these characteristics, volcanic ash cement is typically used in underground structures, underwater projects, and other moist environments. It is not recommended for use in dry areas, or in applications where freeze-thaw cycles, wet-dry cycles, or high early strength are required. This makes it ideal for large-scale construction projects where long-term durability and resistance to moisture are important factors.
The Wall Concealed Shower Mixer, also known as the wall concealed shower Mixer, is a high-end, sophisticated and minimalist design of bathroom equipment. It is cleverly hidden in the wall and does not take up floor space, which enhances the cleanliness of the bathroom while showing a minimalist aesthetic style. Typically made of high-quality stainless steel or copper, these shower mixers are durable and easy to clean.
Its main feature is simple operation, through intuitive knob or touch control, you can easily adjust the ratio of hot and cold water, to meet your personalized water temperature and comfort experience. In addition, many products are also equipped with constant temperature technology to ensure stable water temperature and avoid cold and hot discomfort caused by changes in water sources.
The installation position of the wall-mounted shower mixer is flexible and can be adjusted according to the bathroom layout, which saves space and increases the flexibility of the design. At the same time, its hidden design is not only beautiful, but also protects the wall from water erosion and extends the service life of the wall.
Overall, the Wall Concealed Shower Mixer is a beautiful, practical and high-tech shower solution that adds comfort and convenience to the modern bathroom and is ideal for the pursuit of high quality of life and design.
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