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TINJAUAN SIFAT-SIFAT MEKANIK BETON ALIR MUTU TINGGI DENGAN SILIKA FUME SEBAGAI BAHAN TAMBAHAN Sebayang, Surya
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 15, No 2 (2011): Edisi Agustus Tahun 2011
Publisher : UNIVERSITAS LAMPUNG

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Flowing concrete flow under it own weight and maintain homogeneity while filling and passing around congested reinforcement. Flowing concrete is used to reduce or eliminate the need formvibration to reduce construction cost and reducing construction time. High strength flowing concrete in this research used silica fume as additive material in flowing concrete. The properties investigated are workability, concrete setting time, and compression strength. Proportion ofmaterial for concrete determined according to ACI 211-4R-1993 and combine with Hashimoto method. The addition of silica fume to the concrete are 0 %, 3%, 6%, 9%, 12% and 15% of the cement content. The test result indicated that effect of silica fume in fresh concrete was reduced the workability of the concrete. Addition of silica fume was made fresh concrete enough cohesiveness without causing segregation. Addition of silica fume was increased the initial andfinal setting time. The cylinder compression strength of silica fume flowing concrete at 7day,14 days, and 28 day was higher than compression strength of flowing concrete without silica fume at the same days. The optimum strength of silica fume flowing concrete was 51,35 MPa at 56 days age, in 9 % presence of silica fume.
PENGARUH AGREGAT KASAR BERGRADASI CELAH TERHADAP KUAT TEKAN BETON Irianti, Laksmi; Sebayang, Surya; Wibowo, Rivan Adlia
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 19, No 2 (2015): Edisi Agustus 2015
Publisher : UNIVERSITAS LAMPUNG

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The development of construction and transportation industrial shows significant increase together with the increases of people and the needs. Part of construction which increases significantly is concrete. In concrete making, aggregate gradation affects concrete strength a lot. Aggregate gra- dation can be categorized in 3 kinds that is continuous graded, uniform graded, and gap graded. The purpose of this research is to compare concrete pressure strength of gap graded aggregate and continuous graded aggregate. The research was done by making cylinder samples (d=150 mm, t=300 mm) with concrete pres- sure strength 17,5 MPa, 27,5 MPa and 37,5 MPa. Course aggregate variations which was used were 2 – 3,75, cm, 1 – 2 cm and 0,5 – 1 cm , 2 – 3,75 cm. The treatment of samples was done by drowning it into water and blowing it for 7 days. The samples were tested in 28 days. The result of the test was: (1) average concrete pressure strength with gap graded course aggre- gate was lower than concrete which used continuous graded course aggregate, (2) In concrete mixture with pressure strength 17,5 MPa, maximum load which can be hold by concrete with gap graded course aggregate was not so different from concrete with continuous graded course aggre- gate, (3) The higher pressure strength which was planned, the lower maximum load which can be hold by concrete with gap graded course aggregate, (4) There are differences between elasticity modulus values from this research and elasticity modulus from empirical formulas prediction in ACI 318-83M and Hognestad.
Co-Authors Laksmi Irianti Rivan Adlia Wibowo, Rivan Adlia