SBR latex modified mortar rheology and mechanical behaviour

The paper deals with the influence of water-to-cement ratio (W/C) and percentage of polymer in the setting time, rheology and physical and mechanical properties of a Styrene-Butadiene-Rubber (SBR) Latex Modified Mortar (LMM). An experimental test program including setting time and consistency in the fresh state and porosity, density, ultrasonic modulus and compressive and flexural strength in the hardened state of a LMM at different ages was performed. Several W/C and percentages of latex were studied. The results obtained showed that both parameters interact in the properties in the fresh and the hardened states of the LMM. Multiple linear correlations among dosage parameters and physical and mechanical variables are presented. Linear approximations are acceptable (95% confidence level), taking into account the nature of the LMM. Some dynamic compression tests were accomplished in order to determine some dynamic properties of SBR Latex Modified Mortar, as dynamic modulus (E-0) and loss tangent (tan delta). (C) 2004 Elsevier Ltd. All rights reserved.