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Fiber alkali resistant

Fiber Alkali resistant elass fibers Acid resistant class fibers ... [Pg.147]

Because of the larger surface area (compared with solid-ceramic refractories) the chemical resistance of fibers is relatively poor. Their acid resistance is good, but they have less alkali resistance than solid materials because of the absence of resistant aggregates. Also, because they have less bulk, fibers have lower gas-velocity resistance. Besides the advantage of lower weight, since they will not hold heat, fibers are more quicHy cooled and present no thermal-shock structural problem. [Pg.51]

The main constituent of all fibers of vegetable origin (see Table 88) is, almost exclusively, cellulose, a polymeric carbohydrate (see Textbox 53). Vegetable fibers are resistant to alkalies and to most organic acids but are destroyed by strong mineral acids. [Pg.379]

Next, the alkali-resistance of SA fiber is described in detail compared with other type of SiC polycrystalline fiber using boron instead of aluminum as the... [Pg.130]

Fig. 39 Alkali resistance of the Zr02/SiC fiber with comparative results... [Pg.149]

Glass fiber filters are utilized in dust removal technology. Alkali resistant AR-glass fibers are utilized in the reinforcement of cement for nonloadbearing applications, because E-glass fibers are destroyed by the alkalinity of the bonding cement. [Pg.370]

Fibers commonly used for concrete reinforcement include polypropylene, steel and alkali-resistant glass. The fibers are often of short length (<30 mm) and are randomly mixed in concrete. [Pg.223]

When the coloring of latex-modified mortar and concrete is required, alkali-resistant, weatherproof pigments are used. Furthermore, it is important that the pigments do not obstruct the stability of polymer latexes and the hydration of cements. Alkali-resistant glass, steel, polyamide, polypropylene, polyvinyl alcohol (poval), aramid and carbon fibers are employed as mixable reinforcements. Reinforcing bars for ordinary cement concrete are also used for the reinforcement of the latex-modified concrete. [Pg.31]

S. L. Gao, E. Mader, R. Plonka Nanostructured coatings of glass fibers Improvement of alkali resistance and mechanical properties. Acta Materialica 55 (2007), p. 1043-1052... [Pg.174]

Due to the absence of Ca(OH)2 in the calcium aluminate cement paste a higher durabiUty of glass fibers was expected in fiber reinforced composites. Majumdar [26] proved that the calcium aluminate cement composites had much better mechanical properties, but only the case of alkali resistant glass. [Pg.613]

ASTM C 1666/C 1666M. 2008. Standard specification for alkali resistant (AR) glass fiber for GFRC and fiber-reinforced concrete and cement. West Conshohocken, PA ASTM International. [Pg.630]

Majmndar, A.J, Singh, B., and Ali, M.A. (1981) Properties of high alumina cement reinforced with alkali resistant glass fibers. Journal of Materials Science 16,2597-1607. [Pg.188]

Bentur, A., Ben-Bassat, M., and Schneider, D. (1985a) Dnrability of glass-fiber-reinforced cements with different alkali-resistant glass fibers. Journal of the American Ceramic Society 68,203-208. [Pg.339]

Table IV summarizes the effect of various oxides on the resulting fiber properties [30-31]. The addition of increasing amounts of alumina, beryllia, yttria or nitride has already been discussed in Chapter 4.1.2. These modifiers tend to increase the modulus or stiffness of a glass fiber. In addition, alumina and baria tend to increase the density, alumina and strontia tend to increase the refractive index, and zinc oxide and zirconia tend to increase the alkali resistance of a fiber. Table IV summarizes the effect of various oxides on the resulting fiber properties [30-31]. The addition of increasing amounts of alumina, beryllia, yttria or nitride has already been discussed in Chapter 4.1.2. These modifiers tend to increase the modulus or stiffness of a glass fiber. In addition, alumina and baria tend to increase the density, alumina and strontia tend to increase the refractive index, and zinc oxide and zirconia tend to increase the alkali resistance of a fiber.
Inviscid melt spun calcium aluminate glass fibers have low strength (0.5-1.1 GPa) and moduli (46-58 GPa). Low strength and low stiffness can be attributed to the random structure frozen into the fibers during rapid solidification. As a result, they are not likely to become composite reinforcing fibers, despite their excellent alkali resistance which they share with quaternary calcium-aluminate fibers [9]. [Pg.111]


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