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Effect of polymer concentration as well as impregnation time on physico-mechanical properties of cement-polymer composites
The tensile strength of normal concrete can be increased 2.6 times by steel fiber reinforcement; 5.5 times by polymer impregnation and 7.5 times by the combined techniques. The increase in impact strength for those cases is 2-3, 7-15 and 9-15 times respectively over the plain concrete. Polymer impregnated concrete consists of precast Portland cement concrete impregnated by a monomer which is immediately polymerized. It has the finest structure and is an excellent precasting material for mass housing, tubes of various shapes, road as well as construction slabs and sewers for aggressive medium. The impregnation process of concrete with different types of polymeric materials has improved the physico-mechanical properties of such composites, especially high strength and good durability. Impregnation with monomer takes time. Low intensity ultrasound waves were applied to enhance the efficiency of impregnating monomer into hardened concrete without prior drying. Methyl methacrylate (MMA) could be impregnated into partly air-dried Portland cement concrete without removing free water from the specimen. The present investigation was carried out to study the influence of polymer concentration (various concentration of MMA monomer diluted by distilled water (0, 40, 70 and 100%)) and impregnation time (0, 2, 4 and 6 hrs) as well as curing time of hardened cement pastes on the physico-mechanical properties of the hardened Portland cement-MMA composites. Bulk density, apparent porosity, compressive strength and polymer loading were performed on the impregnated samples after thermal heating at 60 deg C for 24 hr. The results showed that the values of polymer loading decreased with hydration time, which is associated with the discontinuous pore structure. The formation of these pores leads to an increase in the accessibility of the pore system towards MMA impregnation. This effect leads to increasing the polymer loading during the initial stages of hydration up to 28-days. The impregnated cement pastes with 70% MMA for 4 hr gave higher values of mechanical strength than those of other samples. The compressive strength of the composites increases by methyl methacrylate concentration up to 70%. Polymer loading is constant after 4 hr of impregnation time for one-inch thickness and no more access for filling of the pores by polymer. The precast hardened cement pastes cured for 28-days give the best physico-mechanical properties when impregnated with 70% MMA for 4 hr.
Effect of polymer concentration as well as impregnation time on physico-mechanical properties of cement-polymer composites
The tensile strength of normal concrete can be increased 2.6 times by steel fiber reinforcement; 5.5 times by polymer impregnation and 7.5 times by the combined techniques. The increase in impact strength for those cases is 2-3, 7-15 and 9-15 times respectively over the plain concrete. Polymer impregnated concrete consists of precast Portland cement concrete impregnated by a monomer which is immediately polymerized. It has the finest structure and is an excellent precasting material for mass housing, tubes of various shapes, road as well as construction slabs and sewers for aggressive medium. The impregnation process of concrete with different types of polymeric materials has improved the physico-mechanical properties of such composites, especially high strength and good durability. Impregnation with monomer takes time. Low intensity ultrasound waves were applied to enhance the efficiency of impregnating monomer into hardened concrete without prior drying. Methyl methacrylate (MMA) could be impregnated into partly air-dried Portland cement concrete without removing free water from the specimen. The present investigation was carried out to study the influence of polymer concentration (various concentration of MMA monomer diluted by distilled water (0, 40, 70 and 100%)) and impregnation time (0, 2, 4 and 6 hrs) as well as curing time of hardened cement pastes on the physico-mechanical properties of the hardened Portland cement-MMA composites. Bulk density, apparent porosity, compressive strength and polymer loading were performed on the impregnated samples after thermal heating at 60 deg C for 24 hr. The results showed that the values of polymer loading decreased with hydration time, which is associated with the discontinuous pore structure. The formation of these pores leads to an increase in the accessibility of the pore system towards MMA impregnation. This effect leads to increasing the polymer loading during the initial stages of hydration up to 28-days. The impregnated cement pastes with 70% MMA for 4 hr gave higher values of mechanical strength than those of other samples. The compressive strength of the composites increases by methyl methacrylate concentration up to 70%. Polymer loading is constant after 4 hr of impregnation time for one-inch thickness and no more access for filling of the pores by polymer. The precast hardened cement pastes cured for 28-days give the best physico-mechanical properties when impregnated with 70% MMA for 4 hr.
Effect of polymer concentration as well as impregnation time on physico-mechanical properties of cement-polymer composites
El-Alfi, E.A. (author) / El-Hamely, S.A.S. (author) / Abo-El-Enein, S.A. (author) / Abu-El-Naga, H. (author)
Silicates Industriels ; 71 ; 95-99
2006
5 Seiten, 8 Bilder, 11 Quellen
Article (Journal)
English
Physico-mechanical Properties of Paper Sludge-Thermoplastic Polymer Composites
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