Abstract
The purpose of this paper is to study the important engineering properties of the volcanic rocks present with the Nagar Parkar Granites located from Sindh University Campus Jamshoro 5 h 44 min (355.3 km) via Hyderabad - Badin Road and 5 h 57 min (323.5 km) via Naukot - Mithi Road and Islamkot, the rocks look suitable for pavement and concrete aggregates. Number of standard tests were conductedted. Which included; Specific Gravity, Gradation, Soundness, Particle shape and Surface Texture Absorption Index, Abrasion Resistance, Deleterious Materials,, in addition to moisture content and Fineness modulus. Geologically there are two main components known as Pink Granites and Grey granites on the basis of the plagioclase / orthoclase mineral component. Results of the standard tests depicted that both Pink Granites and Grey Granites samples have different characteristics especially concerning abrasion resistance. After comparing the obtained results with standard specifications showed that both samples can produce aggregates that are suitable for pavement but only Pink sample can produce concrete aggregates. It was also assumed that there should be a technical control in the crushing circuit to produce the required gradation.
Highlights
Aggregate technically is considered as a term for the coarse and fine mineral materials such as sand, gravel and crushed stones that are used with a binding medium to form compound materials
Geology and Geochemistry As the Nagar Parkar granites, including the grey granite, are conformably lying with the younger ages and creat doubt on the older ages reported by Khan et al [7]
On the other hand a couple of rhyolite domes [4], equivalents of the first phase volcanic rocks have not been reported from Nagar Parkar, but they are absent from a consequence of erosion
Summary
Aggregate technically is considered as a term for the coarse and fine mineral materials such as sand, gravel and crushed stones that are used with a binding medium (such as Portland cement, water, bitumen,, lime, etc.) to form compound materials Several factors are known to influence the strength of concrete They include their batch ratios, processes, aggregate texture and shape and nature of other constituent materials [10]. Aggregates are mixtures of various sizes of stone or rock particles in contact with each other. They are typically combinations of gravel and crushed materials, such as limestone, basalt and granite, but may include blast furnace slag, or recycled concrete fragments. In earlier concept for a long time aggregate was considered to be an inert filler which is added to cement paste for economic reasons. [12]
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