Estudo da propriedade resistência superficial em revestimentos de argamassa / Study of surface strength property of mortar rendering

AUTOR(ES)

Amália Silva Alves

DATA DE PUBLICAÇÃO

2009

RESUMO

The lack of cohesion in mortar renderings corresponds to the loss of mechanical strength among theirs layers due to the weakening of particles bond, a fact which is reflected, among other events, by a low surface resistance of these renderings. Thus, poor surface strength of mortar renderings accelerates their degradation process, leading to a significant reduction in the level of their performance and leading to failures in the functions assigned to them. In this context, this basically experimental research aimed to study the property of surface strength in mortar renderings. So, was investigated the applicability of some test techniques, pendulum hammer, dynamometer traction and ultrasounds (by indirect method) to evaluate surface characteristics of the mortar renderings. In addition, were also evaluated the effects of moisture absorbed by the renderings, the influences of composition, air entrained content and application way in the surface strength of the mortar renderings. In this study, the experimental program was divided into two stages. In the first stage, were used: one mortar mixed (cement: lime: sand) and one industrial mortar (with air entrained content equal 20%) applied in one type of substrate (concrete surface - standard substrate ABCP) by compressed air projection, so that their produced coverings were tested under different conditions of moisture (oven-dry, dry environment, wet and saturated). In the second stage, were used: one mortar mixed (cement: lime: sand) and three industrial mortars (with air entrained content equal 20%, 30% and 40%) applied to the substrate standard in three ways (manually, by means fall box and by compressed air projection). Using statistical criteria, the main results have shown a significant effect of the four mentioned factors on the surface strength, in view of the testing techniques used. However, only showed no significant the effect of moisture in the hardness index.

ASSUNTO(S)

construcao civil métodos de ensaio umidade surface strength mortar rendering resistência superficial air entrained content argamassa test methods teor de ar moisture revestimento

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