Estudo da aderência no reparo com concreto autoadensável (CAA): influência do preparo da superfície, da resistência à compressão do concreto da base e do tipo do concreto (convencional e CAA)
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2011-04-28
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Universidade Federal de Goiás
Resumo
Efficient repairs in concrete structures require perfect bonding between the base
concrete and the applied concrete. The experimental analysis shown in this study focused on
how bonding is influenced by three types of base concrete preparation: hydro-jet blasting
(BHD), manual scabbling (BMA) and mechanical scabbling (BME), as well as two types of
base surface condition: dry (0%) and humid (100%) and also by the application of three
different types of bonding agents: B - cement + water; C – cement + water + additive
superplasticizer; D – cement + water + additive superplasticizer + active sílica. Fifteen
conventional concrete bases prepared using concrete with compressive strength of class C20
and fifteen self-consolidating concrete bases with compressive strength of class C30 were
tested. Surface roughness was characterized using profiles according to parameters Ra
(standard deviation with respect to an average line) and Rz (average height between
consecutives peaks and valleys). Self-consolidating concrete with C40 compressive strength
was used to repair the concrete bases. Dyna Proceq apparatus was used to determine tension
bonding strength.
The hydro-jet blasting (BHD) preparation presented the lowest surface
roughness values and the highest bonding strength results as well as the lowest values of the
coefficient of variation. The manual scabbling (BMA) preparation presented intermediary
results. The mechanical scabbling (BME) preparation presented the highest surface
roughness values and the lowest bonding strength results. Surface humidity increase the
number of concrete base ruptures. The use of bonding agents increased bonding strength
regardless of the degree of surface humidity.
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ROCHA, Adilson Pereira da. Estudo da aderência no reparo com concreto autoadensável (CAA): influência do preparo da superfície, da resistência à compressão do concreto da base e do tipo do concreto (convencional e CAA). 2011. 192 f. Dissertação (Mestrado em Engenharia Civil) - Universidade Federal de Goiás, Goiânia, 2011.