Hainan GRC component

GRC, namely glass fiber reinforced concrete curtain, is a composite material composed of cement, sand, water, glass fiber, additives and other aggregates and mixtures. The cement hardens after hydration reaction with water to form a cement aggregate, which solidly cements the sand (or other materials) together, and cements and anchors the glass fiber to form a material with good performance. The sand plays a role of filling and skeleton in GRC, and the glass fiber plays a role of reinforcement.

Main features of GRC:

1. Thin wall and light body: GRC density is 2000kg/m ³ About, lighter than concrete, but it can be made into thin-walled members. Generally, the wall thickness of GRC members is about 15mm, the thickest member is less than 30mm, and the thinnest member is 5mm.

2. Random modeling: GRC components are made in molds. Due to light weight, it is very convenient to achieve modeling, and GRC can be made into various complex modeling.

3. Realistic texture: The GRC surface texture is determined by the mold texture. If fine aggregate is used and the particles are fine, the texture and texture can be expressed delicately. GRC can also replicate various texture effects, which is an ideal simulation material. It can be combined with latex paint, fluorocarbon paint, etc. to imitate various textures of granite, sandstone, red brick, ceramic tile, wood, metal, etc.

4. Energy conservation and emission reduction: Compared with other enclosure structures, GRC consumes less energy in its manufacturing and installation process. Japanese scholars have compared the carbon emissions of GRC wallboard and reinforced concrete wallboard, and the use of GRC wallboard can reduce the carbon emissions by 30%.

Material production, construction and installation

The main production processes of GRC materials are spraying process and premixing process. The spraying process is to use a special spray gun to pump the mixed cement mortar to the spray gun through the slurry pipeline, cut the glass fiber into short wires, mix at the spray gun and spray into the mold. The premixing process refers to mixing the cement mortar, adding the cut short glass fiber to make the glass fiber evenly dispersed in the cement mortar, and then pouring it into the mold or vibrating or compacting to form. The mechanized, automated and standardized production of curtain walls has been widely carried out in the industry.

GRC production process

Finalization of product production process, mold making, spraying or premixing process, product demoulding, repairing after demoulding, spraying surface protective agent, product packaging, transportation (transfer), and shipment.

UHPC is an ultra-high strength cement-based material with high strength, high toughness and low porosity. The basic preparation principle is: by improving the fineness and activity of the organizational components, no coarse aggregate is used, and the pores and microcracks inside the material are minimized to obtain ultra-high strength and high durability.

The design theory of UHPC is the maximum packing density theory, and the particles with different particle sizes of its constituent materials form the most compact packing in the best proportion, that is, the gaps between the stacked millimeter sized particles (aggregates) are filled with micron sized particles (cement, fly ash, mineral powder); The gaps between micron sized particles are filled with submicron sized particles (silica fume).

UHPC Material Properties

UHPC has excellent performance, featuring high strength, fire resistance, explosion resistance, hail resistance, chemical corrosion resistance, high durability, aesthetics, ductility, sustainability, etc. At the same time, it is light in structure and can achieve thinner interface, longer span, lightweight and elegant, and more innovative without additional reinforcement and other support.

High durability: UHPC can withstand various harmful substances to penetrate into the matrix under freezing and thawing cycles, marine environment, sulphoaluminate erosion, weak acid erosion and carbonization, and has self-healing ability and excellent waterproof effect.

Aesthetics: UHPC can realize the dreams of many designers, realize the elegant shape of the building and rich color texture and effect.

Ductility: UHPC is a cement-based material, which combines with metal fiber and organic fiber to achieve an organic balance between compressive strength and flexural strength.

Sustainability: unique structure can solve environmental problems and reduce life cycle costs. UHPC can reduce the construction cost, mold cost, labor cost and maintenance cost, and improve the safety, construction speed and construction life cycle of the construction site.

Material composition produced by UHPC

Composite fiber plays a key role in increasing the toughness, deformation performance and impact resistance of ultra-high strength concrete. Various fibers are combined with high-quality cement-based materials for new compounding, so that the shortcomings of cement-based materials are improved and the performance is improved.

Outstanding advantages of UHPC

Macro harmful cracks can be dispersed into fine harmless cracks, and the crack width corresponding to the limit strain can be effectively controlled within 0.1 mm, or even 0.05 mm. At the same time, UHPC has super energy absorption capacity, ductile shear failure characteristics, good deformation coordination with reinforcement, excellent durability and fatigue resistance, which can effectively protect the structure from cracking, improve the impermeability of the structure, effectively prevent the erosion of harmful ions, greatly improve the durability of the structure, and maximize the cost of project operation and maintenance.

The porosity in UHPC is very low, the pore diameter is nanometer and below, and the pore connectivity is very poor, which is equivalent to a thick layer of coating that can isolate oxygen and water vapor on the surface of reinforcement, making the corrosion rate of reinforcement extremely slow.

Using permeable small molecule organosilicon materials, a micro nano structured unidirectional organic membrane is formed on the surface of UHPC, which can not only meet the breathing performance of cement substrate, but also prevent liquid water from entering the cement substrate, and allow water vapor to enter and exit freely to achieve waterproof and self-cleaning effect.