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IBRACON Structures and Materials Journal • 2012 • vol. 5 • nº 1
Cement-base bearing pads mortar for connections in the precast concrete: study of surface roughness
scale production. A plastic membrane with roughness of 1.2 mm
of thickness, measured by a digital pachymeter, was glued in the
molds to analyze the effect of surface roughness of the pads. Thus,
a comparison between the pads with smooth and rough surfaces
can be made (Figure 2).
3. Experimental program
In this paper, the following tests were performed to character-
ize the material: compressive strength, tensile strength by diam-
etral compression and modulus of elasticity. In addition to these
standardized tests, tests on the performance of the material were
conducted. Concentrated and bending loads were applied under
four points load on strips of pads. The pads were tested by ap-
plying a distributed load (monotonic and cyclic). In order to study
Continuing previous studies to develop this type of bearing pad,
this paper aims to present an experimental study of the use of sur-
face roughness on mortar pads with the use of a new form of mold-
ing in order to increase the deformation capacity of the pads.
2. New bearing pads manufacture
technique
The molds used in previous researches, as in studies of Monte-
dor [5] and Siqueira [6], did not provide control of the surface of
the pad, which was exposed and just went through a finishing pro-
cess during the curing of the mortar (Figure 1).
A battery mold was developed in Bellucio [8]. In addition to en-
abling the introduction and control of roughness on both sides of
the pads, the new manufacturing technique also provides large-
Figure 2 – Details of the molds and the texture of pads
Set molds
Demolding of pads
Molds with glued plastic membrane
Pads with rough and smooth surface
A
C
B
D