The need for a pavement matrix in road construction, especially in Sumatra area, is now more difficult and expensive because the deposit materials are concentrated in Java and most of them are not available. For this reason, soil stabilization is a way out of this problem. On this basis it is necessary to conduct stabilization research with highly active stabilization material by using Portland cement type I. The soil to be stabilized is clay soil which is derived from the areas of Jambi and Palembang and which has a low CBR value less than the requirement for sub base or pavement (< 10%), with the expected CBR value of stabilization to be suitable for road construction. This research covers physical and soil mechanical properties which are compaction parameter and CBR value with 3 days of dry curing time and 4 days of soak curing time using ASTM test procedure. Variations of cement addition were used of 6%, 8%, and 10% for the clay soil from Palembang and 8%, 10%, and 12% for the clay soil from Jambi, by percentage of dry weight of the sample test. The results of this study showed that the CBR value significantly increased with the addition of cement, with Palembang soil CBR value rising from 3.46% to 130.74% and Jambi soil CBR value rising from 7.20% to 206.43% respectively.
Nanotechnology has experienced rapid growth, it can be seen the emergence of products and high interest researchers associated with nanotechnology. The implication process natural resources management is no longer limited to generating value addition, but were able to perform value creation. One potential source is the natural silica sand. Silica sand reserves in Indonesia, among others are, South Kalimantan, West Java, East Java and Papua. Utilization of silica sand has been used as a filler only on the construction materials at a price of 20 - 50 IDR/kg, while microsilica: 12,000 – 15,000 IDR/kg and nanosilica: 100,000-150,000 IDR/kg. This study develops the potential of silica sand in Indonesia through testing, XRF, XRD, SEM and PSA. Then further process by nanosilica’s equipment in Indonesia, resulting microsilica and nanosilica Indonesia. The end result made comparisons with microsilica and commercial nanosilica. The results showed that the Planetary Ball Mill (PBM), High Energy Milling (HEM) can be used to generate microsilica. Polishing Liquid Milling Technology (PLMT) can be used to make nanosilica of Indonesia's natural resources, which is equivalent to nanosilica have traded commercial.
This research is a comparative study, the use of carbon fiber and steel fiber for Self-Compacting Concrete (SCC). In previous studies, it was proven that the addition of steel fibers can increase the compressive and tensile strength of SCC. While carbon fiber is one of the most widely used materials for structural reinforcement in recent years. Therefore it is necessary to do a comparative study of the use of carbon fiber if applied to SCC. The percentage increase in carbon fiber and steel is 0.5%, 1%, and 1.5%. Then do the testing of: slump test, compressive strength, tensile strength and flexural strength. The results showed the optimal percentage of steel fiber addition of 1.5%, can increase the compressive strength of SCC by 11%. However carbon fiber and steel do not increase the tensile strength of SCC, and tend to reduce flexural strength. Other results show that carbon fiber is not suitable for use in SCC.
The implementation of construction it is often found inaccuracies in both time and cost between planning and the conditions of implementation on the site. This will result in delays in the execution of the work. In the end there will be a decrease in terms of quality and delay in completion of work. This research aims to analyze the factors causing delays in a building construction project, and identify claims that can be compensated for additional time and costs by the owner. This case studies of this research is analyzing delay in building project, and then the data will be analyzed using the Relative Important Index (RII) approach to obtain the factors with the highest value. Source of respondents chosen is limited from those who have experience in the field of building construction projects. The results shows the indicate of the delay in the implementation of the most important projects caused by late payment by the project owner (owner). In this study, the potential for delays in a construction project caused by the owner reaches 60% while by the contractor by 30%, the rest by force majeure.
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