Influence of Locust Bean Waste Ash on Cation Exchange and Plasticity Characteristics of Cement Modified Lateritic Soil
Muhammad,
Muktar Namadi,
Yamusa,
Bello Yamusa
Issue:
Volume 1, Issue 2, September 2013
Pages:
58-63
Received:
6 August 2013
Published:
30 August 2013
Abstract: A laboratory testing programme was carried out to investigate the influence of Locust Bean Waste Ash (LBWA) on cation exchange and plasticity characteristics of Ordinary Portland Cement (OPC) modified lateritic soil. Preliminary tests were carried out on the natural soil to determine its properties. Other tests were carried out on soil-cement mixtures with up to 4% OPC admixed with 8% locust bean waste ash content by dry weight. Improvement in the plasticity characteristics of the soil was reflected in the decrease of liquid limit, increase in plastic limit and decrease in plasticity index with increased cement and locust bean waste ash content. The results using analysis of variance showed statistical significance. These results showed that modification with cement and locust bean waste ash blend significantly improved the plasticity characteristics through cation exchange of the lateritic soil.
Abstract: A laboratory testing programme was carried out to investigate the influence of Locust Bean Waste Ash (LBWA) on cation exchange and plasticity characteristics of Ordinary Portland Cement (OPC) modified lateritic soil. Preliminary tests were carried out on the natural soil to determine its properties. Other tests were carried out on soil-cement mixtu...
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A Study on Risk Assessment and its Management in India
Issue:
Volume 1, Issue 2, September 2013
Pages:
64-67
Received:
8 August 2013
Published:
30 August 2013
Abstract: All of themost challenging construction projects worldwide involve a variety of complex processes working simultaneously. Managing these processes can be quite a challenge for the management. A big part of meeting these challenges is mitigating the RISKS involved. Risk management includes identifying risks, assessing risks either quantitatively or qualitatively, choosing the appropriate method for handling risks, and then monitoring and documenting risks. This study identifies the procedures for risk identification, management and its perception from the Indian construction industry players. Time and cost management need to be fully integrated with the identification process. Time constraints and project managers with sufficient experience are critical when identifying the level of risk for large and/or complex projects.The aim of this study is to advocate for a method of risk mitigation which includes a well-documented procedure which serves as a one stop-solution to all the risks that would emanate in the future.
Abstract: All of themost challenging construction projects worldwide involve a variety of complex processes working simultaneously. Managing these processes can be quite a challenge for the management. A big part of meeting these challenges is mitigating the RISKS involved. Risk management includes identifying risks, assessing risks either quantitatively or ...
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Design of Very High Performance Concretes Using Local Aggregates
BELAOURA Mebarek,
OUDJIT Mohamed Nadjib,
BALI Abdelrahim
Issue:
Volume 1, Issue 2, September 2013
Pages:
68-73
Received:
22 July 2013
Published:
30 August 2013
Abstract: In recent years, appeared very high performance concretes which are the result of a more and more scientific rationalization. The use of superplasticizers, and more recently of ultrafine particles such as silica fume, has significantly minimized the amount of mixing water in concrete while improving workability. Owing to this water reduction (and thus the w/c ratio), the mechanical strength of such concretes has considerably increased. The compressive strength may exceed 80 MPa. Therefore, their use is very promising from an economic point of view and quality of civil engineering and hydraulics works. The aim of this study is to formulate a VHPC using local materials. The design approach used is the grout method. The obtained results show a clear improvement in the mechanical performance of concrete, resulting in a sufficient compressive strength to allow formwork removal at 24 h, an acceptable tensile strength and shrinkage lower than that obtained in conventional concrete.
Abstract: In recent years, appeared very high performance concretes which are the result of a more and more scientific rationalization. The use of superplasticizers, and more recently of ultrafine particles such as silica fume, has significantly minimized the amount of mixing water in concrete while improving workability. Owing to this water reduction (and t...
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