Gypsum is a monoclinic mineral resource contained in nature. Its main chemical component is calcium sulfate dihydrate (CaSO42H20), which is generally white, colorless or gray. Gypsum is a widely used industrial material and building material. It can be used for gypsum building products, cement retarders, model making, paint fillers, etc. The microporous structure and heating dehydration properties of gypsum and its products make it have excellent sound insulation , Heat insulation and fire resistance.
Industrial by-product gypsum is obtained from the sulfur dioxide in the flue gas treatment of industrial enterprises burning coal or oil, and has the same performance and quality standards as natural gypsum.
In recent years, due to the environmental pollution caused by the mining of natural gypsum resources, and the excessive mining in recent decades, high-quality gypsum has been exhausted; in order to protect the natural environment, many provinces in China have explicitly prohibited the mining of natural gypsum. From the policy source to guide enterprises to comprehensively utilize industrial by-product gypsum, its processing and utilization are of great significance. It not only effectively promotes the further development of the national environmental protection circular economy, but also greatly reduces the amount of natural gypsum mining and protects resources.
Desulfurized gypsum powder (CaS04.1/2H20) is an air-hardening powdery cementitious material prepared by calcination, grinding modification, aging and other processes of industrial by-product gypsum. Gypsum, cement and ash are collectively known as the three major cementitious materials. Among them, gypsum has been recognized as one of the best sustainable building cementing materials. As a new energy-saving, environmentally friendly, green and low-carbon material, it is becoming the market for modern building materials. Mainstream.
Building desulfurization gypsum powder
Desulfurized gypsum powder (CaSO4:1/2H20) is an air-hardening powdery cementitious material prepared by calcination, grinding modification, and aging of industrial by-product gypsum. Gypsum, cement and lime are collectively known as the three major cementitious materials. Among them, gypsum has been recognized as one of the best sustainable building cementitious materials. As a new energy-saving, environmentally friendly, green and low-carbon material, it is becoming the market for modern building materials. Mainstream.
Desulfurization gypsum powder S3.0 | Index requirements |
Fineness (0.2mm square hole sieve residue) | ≤10% |
Initial setting time | ≥3min |
Final setting time | ≤30min |
2h flexural strength | ≥3.0MPa |
2h compressive strength | ≥6.0MPa |
CaSO21/2H20 content | ≥80% |
Anhydrous CaSO content | ≤3% |
CaSO content | ≤3% |
Plastering plaster mortar
The high-purity gypsum powder is matched with scientific aggregates and various imported additives, which are accurately measured and strictly produced by factory. It can be used for leveling and plastering of all kinds of basic walls. It is a green product with convenient construction, no cracking, no hollowing, environmental protection, and breathing function.
product type | usage time | Water retention rate | Compressive strength | Flexural strength | Tensile bond strength |
B | ≥60min | ≥75% | ≥4.0MPa | ≥2.0MPa | ≥0.4MPa |
L | ≥60min | ≥60% | ≥2.5MPa | ≥1.0MPa | ≥0.3MPa |
T | ≥60min | ≥60% | ≥0.6MPa | --- | ≥0.25MPa |
Plaster Cement mortar
advantage: advantage:
1. Good adhesion, suitable for a variety of substrates; 1. High strength
2. Lightweight, good operability, less ash on the ground; 2. Good fire resistance
2. Light weight, good operability, less ash on the ground; 3. Fast setting Disadvantages:
and hardening, saving construction period 1. Poor adhesion, easy to produce hollow drum
4. Small shrinkage, no cracking or hollowing; 2. Large shrinkage, easy to produce cracks
5. Facilitate on-site management and reduce construction environment; 3. Lots of floor ash
6. Green environmental protection, good energy saving and 4. Large thickness of plastering layer
emission reduction effect, adjustable indoor humidity Applicable substrate:
Disadvantages: Sintered brick masonry, cast-in-place concrete, etc.
1. The surface strength is not as good as cement mortar
2. Not suitable for parts with waterproof and moisture-proof requirements
Applicable substrate:
Cast-in-place concrete, aerated concrete wall, ceiling plastering, various
types of masonry, light-weight board wall plastering cement mortar
Project | Plaster | Cement mortar |
Environmental performance | Non-toxic, harmless, low-carbon, environmentally friendly, neutral PH value, does not irritate the skin | One of the main culprits of high energy consumption, high pollution and smog, strong alkaline, irritating the skin |
Main material | Desulfurization gypsum powder, green building materials, circular economy | Cement and sand consume precious natural resources |
Bonding performance | High bonding strength, never hollow, circular economy | Empty drums will appear repeatedly and repeatedly, which is hard to prevent |
Anti-cracking | No cracking | Easy to crack and sand |
Construction performance | Good workability, good anti-sagging performance, less ash on the ground | Poor cohesiveness, much ash on the ground, and large waste of materials |
Single plastering thickness | 10mm or less | 25mm or less |
Construction method | It can be applied mechanically and single-layer spraying in place, supplemented by manual leveling and finishing | Traditional manual work, plastering multiple times according to the thickness |
Construction efficiency | 300- 320m/group (8 people)/day | 70- -90m/group (4 people)/person |
Material characteristics | Fast hardening, no need for watering for maintenance, no putty, early access to the next process, shorten the construction period | Hardening is slow, it must be watered for curing (≥7 days), and putty construction should be carried out after hardening and drying. |
Material density | 0.8-1kg/L, and complete the same area, use less materials, reduce the weight of the building | 1.9kg/L, more materials per unit area, self-weight |
Respiratory function | Can automatically adjust indoor humidity to improve the environment | no |
Heat transfer performance | Can automatically adjust indoor humidity to improve the environment | High thermal conductivity (0.87w/m-k), fast heat conduction |
Fire protection function | Class A1, gypsum contains about 21% crystal water, which is released when exposed to fire, effectively preventing the spread of fire | general |