Durabilitas Beton Bubuk Kulit Kerang di Lingkungan Air Laut

In this study,blood clam used as cement replacement material. The specimens were cured in distilled water until 28 days. Then specimens were immersed in sodium chloride solution until 91 days. The parameters studied include compressive strength, workability, and density. These properties were compared with those of a control concrete that was made of Ordinary Portland Cement (OPC). The main parameter of this study was the proportion of waste blood clam (4% by cement weight)

Analisis Sifat Fisik dan Mekanik Kayu Kelapa Sawit Hasil Kompregnasi Melamine Formaldehyde

During the past time the utilization of palm oil tree only limited to producing fruit to produce oil with all their derivatives, as well as the utilization of husk and midrib. Stem, as the biggest mass palm oil tree has not been used commercially due to its lack of quality. One effort in improving quality of palm oil wood is compregnation. Compregnation interpreted as an effort of putting the chemicals into wood structure using prresure. Chemicals that can penetrate into wood structure in this case is melamine formaldehyde resin. The result of research showed that compregnation palm oil wood by melamine formaldehyde increased the specific of gravity of wood from 0,32 before compregnation to 0,48, 0,58 and 0,65 for 50%, 75% and 100% concentrate. Moisture content decreased from 12,05% before compregnation to 10,67 at 100% concentrate. MOR increased from 64,58 kg/cm2 before compregnation to 131,54 kg/cm2, 188,94 kg/cm2 and 361,14 kg/cm2 each for 50%, 75% and 100% concentrate

Pengaruh Penambahan Serat Polypropylene terhadap Sifat Mekanis Beton Normal

This research studies the mechanical properties of polypropylene concrete consist of compressive strength, modulus of elasticity, splitting tensile strength, flexural strength and deflection. Polypropylene fiber is a kind of plastic fiber that specially produced with high technology. Application of this polypropylene fiber aim to improve the mechanical propertiesof normal concrete. The specimens are cylinder and beam shapes. The variety that use is additional of polypropylene fiber at 0,0 kg/m3, 0,2 kg/m3, 0,4 kg/m3, 0,6 kg/m3, 0,8 kg/m3 and 1,0 kg/m3. The result of research shows that highest compressive strength and modulus of elasticity of concrete occurred at 0,4 kg/m3 polypropylene various. Highest splitting tensile strength and flexural strength of concrete occurs at 1,0 kg/m3 polypropylene fiber various. In generally, deflection test shows improvement within addition of polypropylene fiber. According to the result of research, additional polypropylene fiber into concrete mixture can improve the mechanical properties of concrete, especially compressive strength, modulus of elasticity, splitting tensile strength and deflection of concrete

Agregat Buatan Geopolimer dengan Bahan Dasar Abu Terbang (Fly Ash) dan Abu Sawit (Palm Oil Fuel Ash)

Artificial geopolymer aggregates is one of many methods on making aggregates in case for substitution of natural aggregates. The main ingredients of thisgeopolymer is a material that contains silica and aluminium in a great numbers. In the province of Riau fly ash (FA) and palm oil fuel ash (POFA) are waste materials that until this time did not get utilized optimally whereas this materials are verypotentially for geopolymerization. NaOH and Na2SiO3 are used as alkaline activators, NaOH molarity (0, 8, 10 and 12M ) used as variation on sample composition. The highest compressive strength based on variation is using as the next sample artificial aggregates composition with 1-2cm size of diameters. Researchshowed that 12M variation results the highest compressive strength, that is 2,8 MPa for FA and 9,9 MPa for POFA. Based on that composition artificial geopolymer aggregates were made and then tested by its specific gravity, gradations andabrations

Kuat Tekan dan Sorptivity Beton dengan Serbuk Kulit Kerang (Anadara Granosa)

This study examines the compressive strength and sorptivity of the concrete using powdered shells as a partial replacement of cement. Powder derived from the shells of shell types Anadara granosa who experience burning in the furnace brick and filtered using a sieve # 200. Variations shells used is 4% due to a variation of the optimum. After the trial manufacture of test specimens was performed to compare the nature of the powder concrete with normal concrete shells, then soaking for 7, 28 and 91 days. The results showed the strength of concrete shells powder is lower than normal concrete, concrete Sorptivity powdered seashells higher than normal concrete. From the results show the physical properties of concrete dust shells higher than normal concrete. This happens because the powder concrete shells have more pores and has a lower workability