Studi Perbandingan Kuat Tekan Beton Dengan Agregat Kasar Menggunakan Metode Sni Dan Metode Maximum Density

Variations aggregate gradation in the mixed concrete greatly affect the characteristicsof the concrete. Concrete with dense and continuous gradation is expected to reduce the levels ofair and increases the unit weight of concrete and add to the strength of concrete.Concrete mixturewas planned SNI method with 25 MPa compressive strength with cement and water factorvariation and 15 sample units. To compare the methods of concrete mixtures with the maximumdensity with variation of water cement factor and sample cube 15 units.Compressive strength ofmaximum density method 26 Mpa and SNI method 23,8 Mpa. The compressive strengthmaksimum density method is higher 9.24 % than SNI method, it is also supported by the results ofconcrete weight 8117 kg at maximum density method and 8068 kg at SNI method. Slump withmaximum density method and SNI method shows the same value, then the level of work abilityis also the same

Analisa Karakteristik Beton Non Struktural Menggunakan Cangkang Sawit Sebagai Agregat Kasar

On-structural concrete consists of sand, coarse aggregate (palm shell / crushed stone), portland cement adhesive materials and water. Palm shells are treated as coarse aggregate in the concrete mix non-structural as palm shells loud enough to rupture the field are pretty much expected to be able to replace the coarse aggregate properties. Productivity palm shells are quite large in Riau Province with the extent of oil palm plantations.Primary data collection that consists of data analysis grain palm shells, sand grains of the data analysis, the data characteristics and non-structural concrete compressive strength. The materials used are cement Padang kind of PCC, sand from the lake bingkuang Kampar and palm shells of PTPN V Raja Beach Kampar. Samples of concrete for compressive strength test 48 unit cube size of 15 cm x 15 cm x 15 cm.Grain fineness modulus value of palm shell was 6.80, the apparent specific gravity of 1.14 g / cm3, density SSD 1.12 gr / cm3 and a bulk density of 0.96 g / cm3 and palm shell solid volume weight 0.588 kg / liter. Conditions palm shells are used fairly clean with mud levels only 0.15%. Characteristics of concrete mix fas shows that at 0.40, the optimum value of compressive strength is 4,721 MPa which occurred in the percentage of palm shells 60, 25%, on fas 0.45, the highest optimum compressive strength value was 5.213 MPa which occurred in the percentage of palm shell 51 , 83% at 0.50 fas, optimum compressive strength value was 4.507 MPa which occurred in the percentage of 50% palm shells, the fas 0.55, optimum compressive strength value was 4.799 MPa which occurred in the percentage of 54.167% palm shells and there ± 80 % test sample value of its slump entering the boundaries slump concrete mix

Modul Pembelajaran Algoritma dan Pemrograman

xiv, 384 hlm.; 23 c

PERANAN LUDAH DALAM PENCERNAAN MAKANAN : suatu tinjauan biofisiologis

v,35

Improvements in Physical and Mechanical Properties of Asphalt by Addition of Low-cost Few-layers Graphene (FLG)

Physical and mechanical properties of asphalt have been improved by adding of few-layers graphene (FLG). FLG was obtained from a simple, low-cost and environmentally friendly liquid shear exfoliation method using a kitchen blender. The melted asphalt at temperature of 150oC was mixed with FLG at various concentrations (10 mg/ml, 20 mg/ml and 30 mg/ml) and contents (0 wt%, 3 wt%, 6 wt%, and 9 wt%) by weight of asphalt. The homogenized mixture was taken for penetration and softening point tests, while the mixing with aggregates was carried out for Marshall stability and asphalt concrete flow tests. The characteristics of void in mixture (VIM), void filled with asphalt (VFA), and void in mineral aggregate (VMA) were also investigated. The penetration values decreased (or the asphalt hardness increased) linearly with increasing of FLG concentration and FLG content. The softening point of asphalt increased as the increasing of FLG concentration and FLG content in asphalt with the average softening point increase of about 5%. The Marshall stability and asphalt concrete flow increased with increasing of FLG concentrations and FLG content. However, the addition of FLG did not affect the VIM, VFA or VMA values. Overall, the addition of FLG improves the physical and mechanical properties of asphalt and has promising prospects due to low-cost and eco-friendly nature of FLG