SWELLING AND COMPRESSIBILITY CHARACTERISTICS OF SOIL - BENTONITE MIXTURES

Understanding characteristics of soil mixtures lead to increasing the confidence level before applying such materials in the field. The outcomes of this study can provide insight into the swelling and the compressibility behavior of soil – bentonite mixtures, between non-swelling materials and swelling materials. A simple swell and compression laboratory test has been conducted for the purposes of this study. The result of this study indicated that the existence of bentonite in the soil mixtures influence the swelling behavior, which follows a hyperbolic curve model. Amount and size of nonswelling fraction affected the swelling and compressibility

Effect of Moisture on the Strength of Stabilized Clay with Lime-Rice Husk Ash and Fibre Against Wetting-Drying Cycle

This paper presents the stabilisation of clay soil using lime-rice husk ash with polypropylene fibre reinforcement. Environmental effect of wetting and drying cycles was considered as a caused factor for decreasing the performance of the road pavement. Three moisture content regimes, i.e. optimum-dry moisture content (ODM), optimum moisture content (OMC), and optimum-wet moisture content (OWM), are studied as initial condition of the compacted soil. The soil was mixed with 17% lime and 17% rice husk ash and reinforced with 0.4% fibres. This research investigates the effect of moisture content on the strength behaviour of the stabilized soil with lime-RHA and fibres reinforcement under wetting-drying cycles. The specimen experienced up to four W-D cycles. In general, the unconfined compressive strength (qu) increases up to three W-D cycles and thereafter decreases. Wetting-drying cycles reduces qu after fourth cycles and increases the brittleness of the stabilised soil. This study concludes that the stabilised soil with lime-RHA and fibres should be compacted at the optimum wet moisture content to meet the requirement as unbound layer for pavement structure

Teknik Sipil dan Pembangunan Berkelanjutan

Bidang Teknik sipil tidak dapat dipisahkan dengan kehidupan sehari-hari masyarakat. Bangunan pencakar langit yang dapat dilihat di mana-mana, lalu lintas jalan yang berkembang, jembatan yang indah, dan bendungan seperti benteng kokoh, dan terowongan serta bangunan bawah permukaan adalah bagian tak terpisahkan dari kehidupan kita. Tren global pembangunan berkelanjutan, Teknik Sipil harus menghilangkan atau mengurangi masalah lingkungan yang mungkin timbul dalam proyek. Mulai dari konstruksi ekonomi skala besar, sehingga pembangunan tersebut dapat memberikan manfaat bagi umat manusia dan membuat lingkungan hidup mendapatkan pembangunan dan perbaikan yang berkelanjutan. Oleh karena itu, pembangunan berkelanjutan Teknik Sipil menjadi hal yang sangat layak untuk didiskusikan dan dipelajar

Civil Engineering and Sustainable Development

The field of civil engineering cannot be separated from the daily life of the people. The skyscrapers that can be seen everywhere, the thriving road traffic, the beautiful bridges and dams like sturdy fortresses, and tunnels and subsurface structures are an indispensable part of our lives. The global trend of sustainable development, Civil Engineering must eliminate or reduce environmental problems that may arise in the project. Starting from large-scale economic construction, so that development can provide benefits to mankind and make the environment get sustainable development and improvement. Therefore, the sustainable development of Civil Engineering is very worthy of discussion and stud

A New Formula For Rate Of Swelling Of Expansive Clay Soils

The study of engineered expansive soils attracts the attention of researchers since this soil is mixed and increasingly used in many geotechnical and geoenvironmental application. This paper attempts to the study of swelling properties i.e. swell and swelling pressure, rate of swell, and water adsorption during swell. The kaolin-bentonite mix and sand-bentonite mix specimens are statically compacted and tested in conventional oedometer apparatus for swelling determination. The results of the study show that the mechanism of swell follows three distinct stages: intervoid, primary, and secondary swelling. The swell occurs since the soils adsorb water during water uptake. The rate of swell and maximum swelling are successfully determined using hyperbolic equation

Uses Of Lime -Rice Husk Ash And Plastic Fibers As Mixtures-Material In High-Plasticity Clayey Subgrade: A Preliminary Study

Silica produced from rice husk ashes have investigated successfully as a pozzolanic material in soil stabilization. However, rice husk ash cannot be used solely since the materials lack in calcium element. As a result, rice husk ash shall be mixed with other cementitious materials such as lime and cement to have a solid chemical reaction in stabilization process. The main objective of this study focused on bearing capacity of the stabilized clayey subgrade with lime-rice husk ash and fibers. The main laboratory test shall be compaction and CBR tests. The investigation results revealed that the inclusion of lime-rice husk ash-fiber into the soil decreased MDD and OMC. On the other hand, stabilization and reinforcement with lime-rice husk ash and fibers waste improved significantly the CBR values

Improvement of the bearing of soil by using lime – rice husk ash

ABSTRACT: Rice husk ash is a potential pozzolanic material that can be used for stabilizing agent in the mixture with lime. This paper presents the results of studies in the use of rice husk ash (RHA), yield from rice husk combustion in Yogyakarta -Indonesia, to improve the bearing of soft soil. Laboratory tests have been conducted in this study, such as index properties, compaction, and California Bearing Ratio (CBR) tests. The results of the study show that lime and RHA can increase the bearing capacity of the subgrade. The bearing of treated soils with lime -RHA mixture enhanced multiplies associated with curing time. On the other side, the swell of expansive soil decreased to relatively nonswelling

Lessons Learned from the Recent Natural Disasters in Indonesia

Indonesia was at risk from this earthquake because the region was in the megathrust region. Two deadly earthquakes struck the region early and late in September 2009. A 7.3-Mw magnitude earthquake struck the Tasikmalaya District, West Java Province, at a depth of 30 km on September 2, 2009. Additionally, a magnitude 7.6 earthquake hit Padang on September 30, 2009, the epicenter of which was about 60 km northwest of Padang at a depth greater than 120 km. Massive geotechnical hazards were reported in those quakes. The bursting of the Situ Gintung dam on March 27, 2009 washed away housing and the settlement downstream of the dam. Some lessons can be learned from those disasters. This chapter aims to review the disasters’ geotechnical aspects. The recent disasters in Indonesia pointed out poor preparedness in disaster management. Households, governments, and schools have to enhance their awareness and understanding of collateral hazards. An integrated disaster early warning system (EWS) must be improved for high-risk regions to reduce damage and loss