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- W2012755220 abstract "The national road network continues to play a fundamental and catalytic role in the promotion of social and economic development of Botswana. However, a combination of adverse climatic and geologic factors, such as scarcity of conventional road building materials, near absence of a non saline surface water, and climatic extremes have dictated the need for innovative engineering approaches to highway design, construction and maintenance. In recent years application of fly ash has been considered in road construction with great interest. Fly ash is a pozzolanic material, which in the absence of water combines with lime to produce a cementetious material with excellent structural properties. Attempts have, therefore, been made at Botswana Road Department in collaboration with University of Botswana to explore the feasibility of utilising fly ash alone to improve the physical and strength characteristics of locally available non-standard marginal materials. The results indicate that with the addition of fly ash plasticity decreases while California Bearing Ratio (CBR) increases for calcrete and other locally available marginal materials for road construction. With appropriate amount of fly ash and an adequate curing the material can be improved to meet the requirements of base and sub-base courses. Keywords: Fly ash, marginal materials, calcrete, plasticity index, California Bearing Ratio (CBR) Botswana Journal of Technology Vol.13(1) 2004: 7-12" @default.
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- W2012755220 date "2004-04-05" @default.
- W2012755220 modified "2023-09-26" @default.
- W2012755220 title "Improvement of marginal materials by flyash in road works" @default.
- W2012755220 doi "https://doi.org/10.4314/bjt.v13i1.15378" @default.
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