Kusnadi Kusnadi,
Dewi Sulistyorini,


The risk of failure of structures effect of earthquake be high due to the heavy
volume of concrete has a fairly high (2400 kg/m3). Advances in technology and the
impact of the economic crisis encourage construction of infrastructure use concrete
masonry units under 1900 kg/m3 in weight. The use of lightweight concrete is the
filler material styrofoam intend at non structural components like wall. One of the
problem of making lightweight concrete using styrofoam is the low value of slump, so
that the mix becomes difficult (low workability). It is therefore necessary to add
material superplastisizer This research used 20 cylinder test samples. The
composition of the mixture consists of sand, cement and grain of styrofoam. The
styrofoam in concrete is 20% in volume. The Sample variation consists of light
weight concrete using styrofoam without superplastisizer is four cylinder, with added
superplastisizer four cylinder were 0.5%, 1.0%, 1.5% and 2%, respectively in weight
of cement. The results showed the addition of superplastisizer 0.5%, 1%, 1.5% and
2% of the cement weight increases the value of slump were 100%, 183%, 216% and
507% respectively. The addition of superplastisizer 0.5%, 1%, 1.5% and 2% of the
cement weight increase ceompression strength were 8.48% 4.25%, 12.67% and
17.37% respectively. The addition of superplasticizer will increases the slump for the
same water content in fresh concrete, so can increase the compressive strength of
concrete cylinder.
Keyword : beton styrofoam, workabilitas, superplasticizer

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