In the design of oil wells subjected to temperature variations and imposed deformations, the fracture toughness of the cement pastes is a very important property. In order to obtain higher toughness values and adequate rheological properties, cement pastes modified by polymer and reinforced by wollastonite microfibers were developed and studied. In the present case, the redispersible polymer powder used was the styrene-butadiene rubber (SBR). The pastes were mechanically characterized by the evaluation of compressive strength, Young’s modulus, Poisson’s ratio and strain capacity. The rheological properties, such as plastic viscosity, yield point and gel strength, were obtained in a Couette coaxial cylinder rotational viscometer.

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