ABSTRACT Blended concrete is a mixture of aggregate and blended cement. Substitution of cement into mixed cement has an impact on increasing the pozzolanic reaction in cement. The silica content in Palm Oil Fuel Ash (POFA) is the element most needed to increase the reactivity of pozzolans. A treatment is required to obtain pure silica in POFA through the sol gel precipitation process. The cont…
ABSTRACT The relocation of the capital city to the province of East Kalimantan was based on the relatively small potential risk of an earthquake. Based on records, East Kalimantan has experienced a strong earthquake, so the risk of building failure must be considered. In general, structural system failure can occur due to a level that cannot dissipate energy well enough or is referred to as a …
ABSTRACT Bridges are infrastructure buildings that are affected by technological developments. The shear capacity of reinforced concrete beam sometimes cannot meet the existing requirements. This can be caused by increased loads, inadequate shear provisions in the initial design and material damage due to natural factors. Reinforcement methods by means of externally bonded (EB) and near-surfac…
Abstract The increased use of concrete as a building material will result in an increase in the use of cement. The use of cement in very high quantities will have a significant effect on increasing CO2 emissions and global warming. Cement substitution can help to reduce the excessive use of cement. Furthermore, cement substitution can help reduce the residual cement hydration reaction, namely …
ABSTRACT The success of a project requires the implementation of good management. Good control can reduce the risk of delays and project cost overruns. To improve effectiveness in monitoring and controlling the project, the result value concept method is used. The Result Value Concept Method is able to calculate the amount of costs in accordance with the budget that has been implemented and ma…
ABSTRACT The behavior of a building during an earthquake has a significant effect on the shape, size and geometry of the building. Tall buildings with a large vertical aspect ratio affect the response of the structure when resisting lateral forces. The purpose of this research is to analyze the response of the structure with the plan earthquake to the vertical aspect ratio, then it will model …
ABSTRACT Bridges are infrastructure buildings that are commonly used and very functional in everyday. One of the structural components of the bridge is a reinforced concrete beam as a load bearer that will be forwarded to the foundation. The shear capacity of reinforced concrete beam structures sometimes cannot meet the existing requirements. This can be caused by increased loads, inadequate s…
ABSTRAK In the Riau Province, there are 1,534.581 hectares of oil palm plantations (PKS), which produce 15.2 million tons of solid trash year and 28.7 million tons of liquid waste annually. Every year the area of oil palm plantations has increased. Every 1 hectare OPM produces around 1.5 tons of solid waste of empty palm fruit bunches (EFB) annually in a dry state and 2.64 tons of EFB with a m…
ABSTRACT Concrete that uses POFA (Palm Oil Fuel Ash) as a replacement of cement and a silica combination is known as POFA-blended concrete with silica as reactivity improvement material for POFA. This study aims to examine compressive strength, porosity, shrinkage, weight change, and the effect on environment using Toxicity Characteristic Leaching Procedure (TCLP) in peat water curing for 0, 7…
ABSTRACT Melamine is the coating for general or specific purposes such as automotive and paint additives. Melamine is a fine, white, powdered crystal that reacts to aliphatic and aromatic aldehydes into many products. The upcoming trend in the market such as melamine-based foam is likely to provide huge opportunities in the future. In 2018, Indonesia recorded a melamine import number of 32,503…
ABSTRACT Methyl salicylate (C8H8O3) or oil of wintergreen is an organic compound in the ester group in the form of a colorless liquid which has little solubility in water. Methyl salicylate has uses in various industries. In the pharmaceutical industry, methyl salicylate is used as an active ingredient in drug formulations to take advantage of its analgesic effect and as a warming ointment or …
ABSTRACT Acrylic acid is an organic compound in the form of a colorless liquid which is commonly used in many industries such as the diaper industry, the water treatment industry or the textile industry. In the global market, the consumption rate of acrylic acid is expected to reach more than 8,000 kilo tons in 2020. The high demand for acrylic acid is possibly due to the use of this product f…
ABSTRACT One of the most effective ways of controlling the speed of an induction motor is to control the frequency and voltage of the source. This can be realized by designing an inverter that produces voltages and frequencies that can be controlled. The inverter design in this study uses the SVPWM modulation technique combined with a PI controller with specifications adjusted to the load, is …
Radio Over Fiber technology is a technology that combines fiber access networks with wireless systems where ROF uses fiber optic cables as intermediary media to obtain greater transmission speeds compared to direct transmission. The system of transmitting radio signals through fiber optic channels is carried out by modulating the optical signal using the radio signal to be transmitted. Optical…
ABSTRACT The grounding system is a safety system in for disturbances to electrical equipment, network disturbances against lightning strikes, and short circuit to the ground that can flow to human body. The purpose of this study is to optimizing design of substation grounding system with T-shape grid and compare the required cost. The method used is modification of the grid shape with addition…
ABSTRACT A solar power plant is a renewable power plant that uses energy derived from solar radiation. Solar radiation can be converted directly into electrical energy in a process commonly known as solar cells. Solar panels are also easily exposed to dust on the surface of the panels, which of course also affects the performance of the PLTS. This study aims to determine the effect of pollutan…
ABSTRACT The lighting of the Soeman H.S library is a library that relies on a natural lighting system as its lighting, the lighting in the Soeman H.S library is also assisted with artificial lighting to support the lighting needs of the Soeman H.S library. The library has been operating for about 13 years, so artificial lighting is no longer effective if maintenance is not carried out to meet …
ABSTRACT Garbage s leftovers or waste from the use of a product that s not reused by the owner. inappropriate processing such as accumulation and scattered waste s a problem n big cities. To overcome this problem, waste processing that pays attention to the type of waste, the amount of waste, and the speed at which waste s disposed of can overcome accumulation and scattered waste. This thesis …
ABSTRACT Charcoal is the result of the carbonization process of carbon-containing materials due to decomposition by heat where the charcoal itself can be used as the main ingredient for making graphene. Plasma arc discharge technology has the interesting characteristic that the output power can be controlled easily and precisely by the magnitude of the current. To produce high-voltage plas…
ABSTRACT The payment system at retail stores today generally still uses the traditional cashier system. The cashier must scan the barcodes one by one on each grocery product, so other consumers will have to wait quite a long time if there is only one cashier available. Currently, the self-checkout system method has begun to be developed. Self-checkout system is a facility that allows consumers…