جۆری توێژینه‌وه‌: Original Article

نوسه‌ر

Building and Construction Engineering Department / University of Garmian

پوخته‌

The use of superplasticizer in the manufacture of self-compacting concrete is gradually
more common. Each type of superplasticizer available in the market has different
compositions, causing differences in dosage requirement. Also, superplasticizer affect
the fresh and hardened properties of concrete. In this experimental study the effect of
different dosage of superplasticizer (SP) on fresh properties of self-compacting
lightweight concrete (SCLC) containing coarse aggregate pumice were studied by using
five different percentages for (SP) (1%, 1.3%, 1.5%, 1.7% and 2%) of the binder
weight. (SCLCs) were produced with constant binder content of 550 kg/m 3 and at a
water-to-binder ratio of 0.26. 20% of portland cement was replaced with fly ash by
weight. The workability of SCLCs was quantitatively evaluated by slump flow time and
diameter, V-funnel flow time, and L-box height ratio. Moreover, compressive strength
of hardened SCLCs was measured at 28 days by using compression machine and
Rebound hammer test. The results show that with the increase of (SP) dosage in the
concrete mixture, the flowability increased. However, there is an optimum value of (SP).
The increase of (SP) dosage is accompanied by decreasing of T 500 slump flow and V-
funnel time until it reaches the optimum level. Nevertheless, excessive use of (SP) lead
to increase of slump flow diameter.

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