Application of fumed silica in glass fiber reinforced concrete

    Fumed silica is usually called fumed silica, and the English name is fumed silica. Fumed silica is an amorphous powdery substance obtained by hydrolysis of chlorosilane in high temperature water generated by a hydrogen-oxygen flame. Fumed silica is an amorphous white powder and is a non-toxic, odorless, and non-polluting inorganic nanometer. Material. Fumed silica has a three-dimensional network structure with unsaturated bonds and hydroxyl groups in different bond states (isolated hydroxyl groups, ortho hydroxyl groups, double hydroxyl groups, etc.) on its surface.

    Glass fiber reinforced concrete (GRC) is a high-performance cement-based composite material, which is formed by embedding glass fibers with high elastic modulus into a cement matrix. The cement matrix in GRC enables the glass fibers to maintain the required position and direction of the reinforcement, and transfers external loads between the glass fibers, thereby greatly reducing the brittleness of the cement matrix. The excellent performance of GRC makes it have broad application prospects in the fields of construction, civil engineering, agriculture, forestry, animal husbandry and fishery.

    The main components of GRC are ordinary Portland cement, white cement, low-alkalinity sulfoaluminate cement, alkali-resistant glass fiber chopped strand mat, acrylic copolymer emulsion such as: Forton VF-774, polycarboxylic acid water reducing agent, silica powder , Fly ash, fumed silica.

    The main modification direction of glass fiber reinforced concrete is to add high pozzolanic mineral fine additives to cement, such as: fly ash, silica powder, metakaolin and nano-silica (fumed silica); add to cement Polymer emulsions, such as acrylic tool emulsion "Forton" VF-774; China’s technical route is to use low-alkalinity sulphoaluminate cement and zirconium-containing, titanium alkali-resistant glass fibers (containing 14.5% ZrO2 and 6%TiO2) or high Zirconium alkali-resistant glass fiber (containing more than 26% of ZrO) is equipped with GRC, which is known as the "double insurance" GRC technical route with Chinese characteristics.

    Fumed silica is mainly used in relatively high-end furniture products in GRC, and it is rarely used in ordinary GRC curtain walls. The main functions include: by reacting with calcium hydroxide in the cement, reducing the alkalinity of the cement to improve The durability of GRC products; to improve the strength of GRC products, this is mainly due to the surface effect and small size effect of nanoparticles, because when the size of the particles is reduced to the nanometer level, it will not only cause the number of surface atoms to increase rapidly, but also nano The surface area and surface energy of the particles will increase rapidly, so their chemical activity and catalytic activity have undergone great changes compared with ordinary particles. As the crystal nucleus, a calcium silicate hydrate gel phase is formed on the surface of the particles, which turns the loose calcium silicate hydrate gel into a network structure with fumed silica as the core, and reduces the creep of the cement stone. , Thereby improving the strength and other properties of the hardened cement paste.

Hebei Yuniu Fiberglass Manufacturing Company Limited is a fiberglass material manufacturer with over 10-year experience, 7- year exporting experience.

We are manufacturer of fiberglass raw materials, Such asfiberglass roving, fiberglass yarn, fiberglass chopped strand mat, fiberglass chopped strands, fiberglass black mat, fiberglass woven roving, fiberglass fabric, fiberglass cloth..And so on.

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