Project

The first phase of the new construction of the medical building of Wangwang Hospital in Changsha, Hunan. Due to changes in the use of functions, structural strengthening and concrete repair is required. Among them, the bottom of the 15-layer slab, the bottom of the beam, the surface of the slab, and the surface of the beam are 140 square meters. The carbon fiber strengthening material was provided by Shanghai Horse Construction Technology Co., Ltd. The construction period is l2 days.

Structural strengthening materials

This project uses 300 g/m2, 0.167 mm thick HM-30 carbon fiber fabric and special carbon fiber strengthening glue. The performance of HM-30 carbon fiber fabric is shown in the table

Supporting special glue series A and B two-component modified epoxy resin adhesive. It is composed of HM-180 carbon fiber adhesive primer, HM-180CE carbon fiber adhesive leveling adhesive, and HM-180C3P carbon fiber impregnating adhesive adhesive, which are used in different processes of strengthening construction. The characteristics of HM-180 carbon fiber reinforced professional adhesive are: the primer has strong penetrating power, low viscosity, can penetrate into the pores of the concrete surface well, and has a strong bonding force with the concrete. HM-180CE leveling glue has good construction performance, convenient scraping and high strength. HM-180C3P paste adhesive has low viscosity and high strength. It easily penetrates into the gap between carbon fibers, cures at room temperature, does not contain volatile solvents, has high bonding strength, strong thixotropy, less construction flow, good aging resistance and medium resistance (acid, alkali, water, etc.) The ratio of A and B is wide, easy to use, non-toxic, and easy to operate on site.

The advantages of carbon fiber fabric strengthening technology 

Compared with traditional strengthening technology, carbon fiber material strengthening technology has the following unparalleled superior performance.

① Wide application range. It can be applied to all kinds of strengthening and strengthening of reinforced concrete structures, steel structures and masonry structures. Such as the bending strengthening of reinforced concrete members, the shear strengthening of reinforced concrete beam-column members, the seismic strengthening of columns and the seismic strengthening of masonry.

②High efficiency and high strength. Utilizing the high strength and high modulus characteristics of carbon fiber can improve the bearing capacity and ductility of the structure and components, improve the force performance, and achieve the purpose of high efficiency and high strength strengthening.

③Easy for construction. Simple construction, less space, no wet operation, no noise, no need for large construction machinery, less construction interference, convenient material transportation and carrying, and can be cut at will. It is especially convenient for field operations, such as bridge strengthening.

④ The cross-sectional size of the strengthening member is not increased, and the additional load increases little. The strengthening is thin and light, and does not affect the clearance, nor does it affect the normal operation of houses, bridges, etc., and the added load per square meter after strengthening is not more than 1kg.

⑤The construction quality is easy to guarantee. The strengthening is a soft material, which can be well absorbed to the surface of the component, the effective adhesion rate can reach 100%, and the bubbles can be squeezed out.

⑥Long application time. It is chemically stable and does not react with chemicals such as acid, alkali, salt, etc.

⑦The comprehensive cost is low. Although the material price is relatively high, the comprehensive material cost, construction cost, and use cost are close to the cost of traditional strengthening technology.

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