Artículos de revistas
Study Of Hygral Behavior Of Non-asbestos Fiber Cement Made By Similar Hatschek Process
Registro en:
Materials Research. Universidade Federal De Sao Carlos, v. 17, n. 1, p. 121 - 129, 2014.
15161439
10.1590/S1516-14392013005000180
2-s2.0-84897866269
Autor
Gomes C.E.M.
Savastano Jr. H.
Institución
Resumen
Fiber cement, similarly to all cementitious materials, undergoes dimensional and volumetric changes when it is exposed to dry and wet environments. When exposed to natural weathering, cement-based materials absorbs and may also release water to their surroundings via a very complex inherent pore structure. In this work initialized a few years ago, some properties of asbestos-free fiber cement composites were studied, such as density, porosity and loss or absorption of water. For the understanding of the behavior of this material, modifiers were employed in the cement matrix such as styrene- acrylic, styrene-butadiene and vinyl acetate-versatic vinylester copolymers to verify their influence on the variables described above. All composites were analyzed by mercury intrusion porosimetry (MIP). For monitoring the expansion/shrinkage movements, the specimens were exposed inside a controlled environmental chamber with constant temperature and relative humidity (RH) during the test time. The results showed no interference on hygral behavior because particular casting process of these composites but, as showed by literature, increase of toughness. Also, it was possible to verify that moisture movement within the asbestos-free fiber cement can be very complex and the variables density and porosity (pore structure) play a very important role in the expansion/shrinkage properties of these composites. 17 1 121 129 Arkers, S., Partl, M., Hygral and thermal expansion/shrinkage properties of asbestos-free fibre cement (1990) Cement and Concrete Composites., 12, pp. 19-27. , http://dx.doi.org/10.1016/0958-9465(90)90032-S Savastano, H., Agopyan, V., Transition Zone Studies of vegetable fibre-cement paste composites (1999) Cement and Concrete Composites., 21, pp. 40-57. , http://dx.doi.org/10.1016/S0958-9465(98)00038-9 Bentur, A., Mindess, S., (1990) Fibre Reinforced Cementitious Composites., p. 449. , London: Elsevier Applied Science Chandra, S., Flodin, P., Interactions of polymers and organic admixtures on portland cement hydration (1990) Cement Concrete Research., 17, pp. 975-890 Ohama, Y., Polymer-base admixtures (1998) Cement and Concrete Composites., 20, pp. 189-212. , http://dx.doi.org/10.1016/S0958-9465(97)00065-6 Ohama, Y., Recent progress in concrete-polymer composites (1997) Advn. Cement Bas. Materials., 5, pp. 31-40 Fowler, D.W., Polymers in concrete: A vision for the 21st century. (1999) Cement and Concrete Composites., 21, pp. 449-452. , http://dx.doi.org/10.1016/S0958-9465(99)00032-3 Kong, X.M., Li, Q.H., Properties and microstructure of polymer modified mortar based on different acrylate latexes (2009) Journal of the Chinese Ceramic Society., 37 (1), pp. 107-114 Zhang, Z., Wang, P., Wu, J., Dynamic mechanical properties of eva polymer-modified cement paste at early age (2012) Physics Procedia., 25, pp. 305-310. , http://dx.doi.org/10.1016/j.phpro.2012.03.088 Wang, R., Wang, P.M., Li, X.G., Physical and mechanical properties of styrene-butadiene rubber emulsion modified cement mortars (2005) Cement and Concrete Composites., 35, pp. 900-906. , http://dx.doi.org/10.1016/j.cemconres.2004.07.012 Wang, R., Wang, P.M., Physical properties of SBR latex-modified mortar under different curing methods (2009) Journal of the Chinese Ceramic Society., 37 (12), pp. 2118-2123 Wang, R., Wang, P.M., Function of styrene-acrylic ester copolymer latex in cement mortar (2010) Materials and Structures., 43, pp. 443-451. , http://dx.doi.org/10.1617/s11527-009-9501-3 Wang, R., Wang, P.M., Action of redispersible vinyl acetate and versatate copolymer powder in cement mortar (2011) Construction and Building Materials., 25, pp. 4210-4214. , http://dx.doi.org/10.1016/j.conbuildmat.2011.04.060 Gomes, C.E.M., Ferreira, O.P., Analyses of microstructural properties of VA/VeoVA copolymer modified cement pastes (2005) Polímeros., 15, p. 3. , http://dx.doi.org/10.1590/S0104-14282005000300009 Wang, P.M., Zhang, G.F., Zhang, Y.M., Influence of polymer powders on mechanical properties of cement mortar (2005) New Build Materials., 1, pp. 32-36 Afridi, M.U.K., Ohama, Y., Demura, K., Iqbal, M.Z., Development of polymer films by the coalescence f polymer particles in powdered and aqueous polymer modified mortars (2003) Cement and Concrete Composites., 33, pp. 1715-1721. , http://dx.doi.org/10.1016/S0008-8846(02)01094-3 Jansen, L., Götz-Neunhoeffer, F., Neubauer, J., Haerzschel, R., Hergeth, W.-D., Effect of polymers on cement hydration: A case study using substituted PDADMA (2013) Cement and Concrete Composites., 35, pp. 71-77. , http://dx.doi.org/10.1016/j.cemconcomp.2012.08.022 Nestle, N., Kühn, A., Friedemann, K., Horch, C., Stallmach, F., Herth, G., Water balance and pore structure development in cementitious materials in internal curing with modified superabsorbent polymer studied by NMR (2009) Microporous and Mesoporous Materials., 125, pp. 51-57. , http://dx.doi.org/10.1016/j.micromeso.2009.02.024 Zhang, G.F., Wang, P.M., Wu, J.G., Influence of polymer powder on the bulk density and capillary water adsorption of cement mortar (2004) New Build Materials., pp. 29-31 Ollitrault-Fichet, R., Gauthier, C., Calmen, G., Boch, P., Microstructural aspects in a polymer-modified cement (1998) Cement and Concrete Research., 28 (12), pp. 1687-1693. , http://dx.doi.org/10.1016/S0008-8846(98)00153-7 Knapen, E., Gemert, D.V., Cement hydration and microstructure formation in the presence of water-soluble polymers (2009) Cement and Concrete Research., 39, pp. 6-13. , http://dx.doi.org/10.1016/j.cemconres.2008.10.003 Stark, J., Recent advances in the field of cement hydration and microstructure analysis (2011) Cement and Concrete Research., 41, pp. 666-678. , http://dx.doi.org/10.1016/j.cemconres.2011.03.028 Bentur, A., Mindess, S., Fibre reinforced cementitious composites (2006) Modern Concrete Technology Series. Ball, H.P., The effect of Forton compound on GFRC curing requirements Proceedings 4th Biennial Congress of the GRCA, 1983, pp. 56-65. , Stratford-upon-Avon. Stratford-upon-Avon 1993; Bijen, J., Curing of GRC (1987) Proceedings 6th Biennial International Congress of the GRCA, pp. 71-77. , 1987 Edinburgh. Edinburgh Bijen, J., Polymer modified glass fibre reinforced cement (Polymermodifizierter [22] Glasfaserbeton) (1989) Concrete Pre-castingand Technology., 12, pp. 44-51 Bijen, J., Jacobs, M.J.N., Properties of glass fiber reinforced, polymer modified cement (1981) Journal of Material and Structures., 15 (89), pp. 445-452 (2001) EN 197-1 - Cement (Part 1): Composition Specifications and Conformity Criteria for Common Cements., , European Standards., EN (2009) ASTM C 948-81, , American Society for Testing and Materials., Standard Test Method for Dry and Wet Bulk Density, Water Absorption, and Apparent Porosity of Thin Sections of Glass- Fiber Reinforced Concrete. ASTM (2009) ISO 8336: Fibre-cement Flat Sheets. Product Specification and Test Methods., , International Organization for Standardization. ISO (2004) EN 494: Fibre-cement Profiled Sheets and Fittings., , European Standards., Product specification and test methods. EM