Abstract
Stone-quarry fines have been evaluated in mortar and concrete, but have presented drying shrinkage and consequently higher incidence of cracks than those with natural sand. This study compared the dry ripened mortar in two types of aggregates added of 8% rubber powder. It was used quicklime, artificial and natural sand in volumetric proportions of 1:6. Mixtures were oven-dried, received the cement, establishing the volumetric proportion of 1: 1.5:9. Inplastic state, we evaluated aspects such as consistence, air content, water retention and bleeding; whereas compressive strength, static deformation modulus and water absorption by capillarity was determined in hardened state. Cracking aspects were evaluated in substrate. As a result, the mortar with artificial sand showed higher increases in compressive strength, capillarity rate and cracking, and greater reductions in air content and bleeding. As for the rubber powder, exhibited a greater reduction in the cracking rate and capillarity was found.
Highlights
The growing demand for materials used in civil construction in Brazil is increasing every year
In this study we examined the plastering mortar with artificial sand replacing natural sand, and addition of 8% rubber powder form unserviceable tires, in which it was used the process described in Canova et al (2012) that resulted in dry ripened mortar and established that this addition was the most suitable
Ripened and dried mortars were tested with cement composing the volumetric proportions of 1:1.5:9 – equivalent in weight 1:0,993:9.623 and added 8% rubber powder from unserviceable tires and named as: As0RP – Oven-dried mortar with artificial sand, packed, and stored for 60 days
Summary
The growing demand for materials used in civil construction in Brazil is increasing every year. An alternative material with characteristics and conditions to be used to reduce the drying shrinkage and crackings in mortar lining with stone-quarry fines is the rubber powder from unserviceable tires, which can be used either as replacement or in addition to mortar and concrete. Canova et al (2012) analyzed mortar of quicklime and natural sand (which was oven-dried and added of rubber powder from unserviceable tires), and observed an improvement in relation to conventional mortar, with reduced water exudation, free shrinkage and cracking. Tires, in which it was used the process described in Canova et al (2012) that resulted in dry ripened mortar and established that this addition was the most suitable In this way, we sought to minimize environmental impacts problems and mainly to reduce the cracking of coatings, which were more pronounced in mortars with artificial sand
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