KOMPARASI KUALITAS FLOWING CONCRETE DITINJAU DARI TINGGI JATUH PENGECORAN DAN JENIS SEMEN

Abstract

ABSTRACT
Pumping method is the most frequently used to transport concrete vertically
in multistory building construction. However, such pumping method is still up
against many problems: (1) the high performance of concrete requires a high
quality of flowing concrete; (2) close-meshed framing causes difficulties in
distributing the concrete. This research aims to clarify the influence of foundry
fall height and cement type toward compressive strength and water absorption
difference of flowing concrete.
Two type of cements, Portland Cement (PC) and Portland Pozzoland
Cement (PPC), were tested in this experimental research. Variation of foundry
fall height is categorized into Oem, 35cm, 70cm, and 100cm. Compressive
strength and water absorption of each variant of flowing concrete was measured
after reaches age of 90 days; three of test objects represent by one data.
The research concludes that: (1) there is a compressive strength difference
of flowing concrete using both PC and PPC as the result of foundry fall height.
Maximal compressive strength difference is reached at fall height of 100cm; for
PC is 15.36% and PPC is 6.690/0. (2) there is a water absorption difference of
flowing concrete as the result of foundry fall height using both PC and PPC.
Maximal water absorption difference is reached at fall height of 100cm; for PC
is 12.05% and PPC is 32.50%.
Keywords: fall height, flowing concrete, compressive strength, water absorption,
cement type