Densitas, Nilai Slump, dan Kuat Tekan Beton OPC dan OPC POFA dengan Campuran Air Gambut Terpapar di Lingkungan Gambut

This research study aimed to test the density of fresh concrete, slump value and compressive strength of concrete using OPC cement and concrete with composition of 90%OPC+10%POFA (palm oil fuel ash). That concretes mixed with peat water. pH of peat water used ranges from 3.0 to 4.0. These specimens are cast in situ. Direct specimen exposed and soaked for 28 days in the peat canal. OPC concrete that mixed with peat water generate density values were small. An increase in the value of the slump of OPC concrete mixed with peat water compared to the controling OPC. As for concrete of 90%OPC+10%POFA slump value decreases. Compressive strength of OPC concrete and concrete of 90%OPC+10%POFA were soaked for 28 days in the peat showed relatively similar results compared to the normal condition

Kuat Tekan dan Perubahan Berat Mortar Abu Sekam Padi (Rice Husk Ash) di Lingkungan Air Gambut

Peat water potentially damage and attack calcium, reduce the strength and accelerate corrosion of mortar and caused significant degradation in the long term. This study aims to determine resistance acid to cement with using added materials were exposed to acidic water. Two types of hardened cementing materials, such as Ordinary Portland Cement (OPC) and Rice Husk Ash (RHA) will be soaked in regular water and peat water. Cement was replace with 15% of rice husk ash. The acid resistance of cements was test by compressive strength, sorptifity, and porosity. There was a considerable decrease in the compressive strength of mortar OPC after exposure to acid attacks from peat water. This research show mortar with rice husk ash was more resistant in peat water for 91 days

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

Penyisihan Kadar Logam Fe dan Mn pada Air Gambut dengan Pemanfaatan Geopolimer dari Kaolin sebagai Adsorben

Geopolymer is kind of shyntetic compound that made by syntesizing alumino and silicate, known has similarity with zeolit. In this study eleborate that geopolymer which made by kaolin used for adsorben to remove ion Ferrum and Mangan in peat water by using adsorption process. The influence of ratio alkaline activator to kaolin and adsorbent dosage examined at constant particle size and contact time to analyzed the eficiency of removal Ferum and Mangan by using batch system. The adsorption process of geopolymer by using batch system made of kaolin as an adsorption prove that geopolymer which made by kaolin have excelence ability to removing Ferum and Mangan from peat water

Kuat Tekan dan Perubahan Berat Beton OPC dan OPC POFA dengan Menggunakan Air Gambut sebagai Air Pencampur di Lahan Gambut

This research study the compressive strength and mass loss of OPC concrete and concrete combine of OPC +10% palm oil fuel ash (POFA). The specimens cured in peat environment until 28 days. Compressive strength of concrete OPC G higher than OPC POFA G because reaction of pozzolanic make slowly calcium silicat. Weight changes showed OPC G until 28 days increased because acid can make expantions so volume of concrete increased. Concrete OPC G +10% POFA decreased because reaction pozzolanic can less acid for concrete

Korosi Baja Tulangan pada Beton OPC, PCC, dan OPC POFA di Lingkungan Air Garam

This paper presents the results of an experimental investigation on the steel reinforcement corrosion and sorptivity. Concretes having three type of cements (OPC, PCC, and a mixtured of palm oil fuel ash). The effect of using blended cements on the resistance of concrete against damage caused bycorrosion of the embedded reinforcement has been investigated using an halfcell potential (ASTM C876). PCC concrete showed high resistance against damage by corrosion of the steel reinforcement

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)

Kuat Tekan dan Kuat Tarik Belah Beton OPC dan OPC Abu Sekam Padi di Lingkungan Gambut

The objective of the study is to investigate the mechanical properties of concrete with different replacement levels of Ordinary Portland Cement (OPC) by Rice Husk Ash (RHA). Two RHA replacement levels were considered in the study which is 5% and 10% by the weight of cement. After the specified initial curing period (28 days), specimens were immersed directly in peat water canal for 28 days. The mechanical properties was evaluated by measuring the compressive strength and tensile strength of the concrete specimens. The result shows that the compressive strength of OPC concrete is higher than OPC concrete using RHA as cementitious materials. A replacement level of 10% RHA in OPC concrete performs and shows better tensile strength than other replacements