GRC component production, construction, acceptance operation manual - Green Building Industry & Trading Ltd Co.

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GRC component production, construction, acceptance operation manual

GRC component production, construction, acceptance operation manual

The first part is an overview

GRC is glass fiber reinforced cement (Glassfibre reinforced cement) English abbreviation, 1970s developed by British Building Research Establishment (BRE) with Pilkington Pilkigton, and in our country started later in Europe. In the late 1970s to begin research and development, but the rapid development, now national R & D and production unit has reached more than 200. GRC consists of two main materials: one is composed of alkali resistant glass fiber, the cement. The country is ordinary portland cement, the domestic is used in low alkali sulphoaluminate cement and alkali resistant glass fiber.

GRC component has the advantages of high strength, high toughness, water resistance, fire resistance, etc., which can be used in the wall panels, ceiling panels, roof panels, permanent formwork and exterior decoration, etc., can not only shorten the construction time and save materials. GRC decorative elements of the current industry recommended standards - JC/T940-2004 "glass fiber reinforced cement (GRC) decorative elements" only on the physical and mechanical properties of GRC components and the size of the appearance of the provisions, the pre embedded steel frame is not required, the shape of the connection without specific requirements.

This manual is through the construction of the quality of the research, analysis of the causes of quality problems, and put forward the prevention of quality problems, combined with the actual development of the GRC decorative components of the installation process and process requirements, with reference to 940-2004 Q/TDQC, 01-2004 JC/T developed a corresponding quality acceptance criteria.

The second part is the problem and solution of GRC construction

One, GRC steel corrosion problems

Reserved steel bar corrosion problems in:

1 installed surface cracking of GRC components, internal corrosion, rust leakage;

2 have been produced by the GRC component, honeycomb pits, leakage of steel, not installed when rusty;

3 has been installed GRC components, the use of the top of the screw fixed, the top of the screw is rusty; the use of pre embedded steel welding connection, welding parts not rust treatment and rust. If the component is connected with the main body, it will lead to the loss of the component, which will lead to serious security problems.

Two, GRC component to install a solid security problem

GRC component to install a solid security problem in:

1 due to the corrosion of steel bars, the durability of the components;

2.GRC member of the screw hole edge to strengthen not standard, easy to fall off;

3 there is no uniform provisions and practice in the length of the main structure of the main structure of the bolt;

4 no rust preventive measures against the top of the screw;

5 no reliable anti rust preventive measures are not used in the welding interface which is welded by the steel bar.

Three, crack problem

The crack problem of GRC component is reflected in:

1 to produce the cracks in the process of solidification;

2 local cracks after installation;

3 due to rebar corrosion lead to cracks.

Four, solve the problem of thinking

1 the solution to the problem of corrosion

A, GRC) reinforced components adopt embedded parts rust measures. The high alkalinity (pH > 12.5) of cement hydration, so that the steel surface to form the purification film, is the main basis and basic conditions for the protection of steel bars, when the pH value of the component is not stable, when the pH value is less than 11.5. Because of the universal adoption of rapid hardening sulphoaluminate cement for GRC component, which belongs to the low alkalinity cement, based on the JC / t940-2004 the glass reinforced cement (GRC) decorations ", GB20472-2006 the sulphoaluminate cement" standards, reinforcement shall be using stainless steel wire or steel wire, galvanized, embedded parts should adopt stainless steel or galvanized steel sheet, etc., conditional can use epoxy coated steel bars.

B) to reduce the chlorine ion content in the GRC component. The content of chloride ion in the member has a great influence on the corrosion of steel bar, and the excessive chlorine ion can destroy the passivation film on the surface of the steel bar, which leads to the corrosion of steel bar. In GRC checks, is strictly prohibited use of sea sand, should be regularly detected sand chloride ion content in, prohibited the use of chloride ion content exceeding standard in the industrial wastewater mixing mortar.

C) can be added to the admixture acrylate copolymer emulsion (Bing Ru). Acrylic emulsion is a kind of water dispersion of polymer, it is a kind of cement modifier, which can improve the crack resistance, waterproof, waterproof, anti chloride ion penetration, wear resistance, aging resistance and other properties of GRC component.

D) to enhance the density, integrity and protection layer thickness of GRC component. GRC component of compacting degree and integrity refers to the component if there is crack, no honeycomb holes, missing edge off angle, dew tendons, make reinforcement rusty key factor lies in atmospheric oxygen penetrating reinforced surface, if the component dense, intact and protection layer thickness can be guaranteed can effectively prevent water and oxygen into and GRC component production should be low water cement ratio, improve the component compactness, production process in strict control of pre embedded steel bar diameter, position, strict inspection pad placement with to ensure effective component protective layer thickness.

GRC) e component outer coating isolation layer. This method can improve the waterproof and durability of the components, the corrosion environment can delay the carbonation speed, the role of protection components, the construction of the first to remove the component attached, so that it is fully dry, in the component surface coating mortar or insulating layer, such as asphalt paint, epoxy resin paint or paint corrosion.

2 solution to the problem of crack

A) to strengthen the maintenance of GRC component. Maintenance is to make the GRC component in the early to keep the moisture content of the water does not make the evaporation. The moisture content in the component is used for cement hydration and thus the strength of the cement is developed, and the permeability and shrinkage are reduced to prevent cracking.

B) to avoid setting time of GRC. In the GRC component, there are cracks, in addition to the production process, maintenance and other factors, mainly caused by cement quality problems, which surface micro cracks are

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