No abstract

Expansive soils are so widespread that it becomes impossible to avoid them for highway construction. Many highway agencies, private organizations and researches are doing extensive studies on waste materials and research projects concerning their feasibility and environmental suitability. Utilization of industrial waste materials in the improvement of soils is a cost efficient and environmental friendly method. The properties of the black cotton soils can be altered in many ways viz. mechanical, thermal and chemical means. Therefore, soil stabilization techniques are necessary to ensure the good stability of soil so that it can successfully sustain the load of the superstructure especially in case of soil which is highly active; also, it saves a lot of time. This paper describes the attempts made to investigate the stabilization process by blending different percentages of Tile Waste and Recron-3S Fibres in expansive soil and conducted various laboratory tests like Atterberg;s Limits, Compaction and Soaked CBR with a view to determine the effect on strength properties of expansive soil. Test results shows that stabilizing expansive soil with Tile Waste and Recron-3S Fibres enhance the strength.

The term Concrete Mix Design is the process of selecting suitable ingredients of concrete and determining their relative amounts with the objective of producing a concrete of the required, strength, durability, and workability as economically as possible. The proportioning of ingredient of concrete is governed by the required performance of concrete in 2 stages, namely the plastic and the hardened stage. If the plastic concrete is not workable, it cannot be properly placed and compacted. The property of workability, therefore, becomes a vital importance.The compressive strength of hardened concrete which is generally considered to be an index of its other properties, depends upon many factors, e.g. quality and quantity of cement, water and aggregates; batching and mixing; placing, compaction and curing. The aim of this study is to evaluate the high performance of concrete containing supplementary cementations materials such as Alccofine.. In the present study, the effect of Alccofine on properties of concrete has been studied.

Class F fly ash cannot be used alone as a construction material due to its low self-cementing properties. This paper reports the compaction characteristics, strength properties and microstructure of lime-amended fly ash with varying lime content from 0 to 12%. The effects of the curing temperature on the strength and microstructure of the lime-amended fly ash are studied at different curing periods varying from 0 to 60 d and with the curing temperature varying from 10 to 90°C. The test results showed that an increase in either lime content, curing period or temperature increases the unconfined compressive strength (U CS) and California bearing ratio (C BR) values. It also influences the formation type and amount of hydration products. Lower-temperature-cured specimens show a continuous improvement in strength with curing age, whereas the strength of high-temperature-cured specimens stabilises much earlier. The mineralogical study established crystalline phases of calcium aluminium silicate and aluminosilicate with the presence of ettringite, which imparts higher strength.