This research focused on making soft clay more stable to facilitate construction. Researchers at the Universiti Teknologi MARA mixed clay with various waste materials to enhance its engineering quality.
This research set out to improve the engineering quality of clay using waste materials and a secret binder ingredient.
Copyright : wikimedia
Clay is a natural material composed primarily of fine-grain minerals. It consists of tiny particles that have plastic and adhesive properties. Clay also possesses small voids and pores, so it's capable of retaining water. In this condition, it tends to expand and shrink, which can lead to settlement.
When exposed to increments of water, clay tends to soften and liquefy. Clay often causes difficulties in construction with its low strength and stiffness. This has caused serious problems in geotechnical engineering because weak soil may cause damage to the foundation of buildings and cracks along the road pavement.
Due to the rapid growth development of infrastructures facilities in Malaysia, it is impossible to avoid constructing on clay. Clay makes up 20% of the total soils in Peninsular Malaysia. It can be found in the West and East Coast of Peninsular Malaysia. This type of soil is generally classified as marine clay. This clay originates from flooding during ancient times. The sedimentation of seabed was very thick and can be up to 60 metres in depth, or roughly the height of a 20 storey-building. Hence, the construction over clay may experience bearing capacity failure and excessive settlement.
Stabilization of soil using cementitious material becomes optional to solve this problem. Cementitious materials are several binding materials that may mix with water to form a plastic paste.
Ordinary Portland Cement (OPC) is used as a common cementitious binding agent. From a previous study, stabilization of soil using cement was one of the soil treatment applied to improve soil plasticity and workability. Therefore, this research focuses on determination of the strength that can be produced by using waste material ashes as part of the additive mixture.
This will decrease the use of Ordinary Portland Cement (OPC) to help stabilize clay. By doing this, more economical soil mixes can be produced.
The selected waste materials are bottom ash (BA) and fly ash (FA). They are a byproduct from electric power plant. These waste materials are disposed and generally have no economical value.
BA is physically coarse, porous, glassy, granular, greyish and incombustible materials that are collected from the bottom of furnaces that burned coal whereas FA is grey in colour and dust-like material.
It is found that they have pozzolonic properties which make it possible to replace cement in deep soil mixing. On top of that, a secret ingredient has been added to promote better pozzolonic reactions between the additives and clay.
This research was conducted for soil engineering properties and strength test for various inclusions of ashes into the clay soil. The percentage of additives is 5%, 10% and 15% of each ash. Improvement levels were evaluated from the results of unconfined compression test (UCT) carried out at different curing times.
Other soil characteristics like plasticity, particle density and compaction properties were also monitored.
The results showed that by using these admixtures, the strength development can be increased over time. This proved that these admixtures can be promising ingredients in deep soil mixing. By doing so, a high performance clay cement column can be produced in the near future.
Juhaizad Bin Ahmad
Institute of Infrastructure, Engineering & Sustainable Management (IIESM)
UiTM Shah Alam
Email : firstname.lastname@example.org
Modular storage tank for tight spaces
16.03.2017 | FIZ Karlsruhe – Leibniz-Institut für Informationsinfrastruktur GmbH
Smart homes will “LISTEN” to your voice
17.01.2017 | EML European Media Laboratory GmbH
Staphylococcus aureus is a feared pathogen (MRSA, multi-resistant S. aureus) due to frequent resistances against many antibiotics, especially in hospital infections. Researchers at the Paul-Ehrlich-Institut have identified immunological processes that prevent a successful immune response directed against the pathogenic agent. The delivery of bacterial proteins with RNA adjuvant or messenger RNA (mRNA) into immune cells allows the re-direction of the immune response towards an active defense against S. aureus. This could be of significant importance for the development of an effective vaccine. PLOS Pathogens has published these research results online on 25 May 2017.
Staphylococcus aureus (S. aureus) is a bacterium that colonizes by far more than half of the skin and the mucosa of adults, usually without causing infections....
Physicists from the University of Würzburg are capable of generating identical looking single light particles at the push of a button. Two new studies now demonstrate the potential this method holds.
The quantum computer has fuelled the imagination of scientists for decades: It is based on fundamentally different phenomena than a conventional computer....
An international team of physicists has monitored the scattering behaviour of electrons in a non-conducting material in real-time. Their insights could be beneficial for radiotherapy.
We can refer to electrons in non-conducting materials as ‘sluggish’. Typically, they remain fixed in a location, deep inside an atomic composite. It is hence...
Two-dimensional magnetic structures are regarded as a promising material for new types of data storage, since the magnetic properties of individual molecular building blocks can be investigated and modified. For the first time, researchers have now produced a wafer-thin ferrimagnet, in which molecules with different magnetic centers arrange themselves on a gold surface to form a checkerboard pattern. Scientists at the Swiss Nanoscience Institute at the University of Basel and the Paul Scherrer Institute published their findings in the journal Nature Communications.
Ferrimagnets are composed of two centers which are magnetized at different strengths and point in opposing directions. Two-dimensional, quasi-flat ferrimagnets...
An Australian-Chinese research team has created the world's thinnest hologram, paving the way towards the integration of 3D holography into everyday...
24.05.2017 | Event News
23.05.2017 | Event News
22.05.2017 | Event News
26.05.2017 | Life Sciences
26.05.2017 | Life Sciences
26.05.2017 | Physics and Astronomy