There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.

Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

I and i

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Properties Of Concrete

Strength and mechanical behavior of short polypropylene fiber reinforced and cement stabilized clayey soil

The mechanical properties of fly ash-based geopolymer concrete with alkaline activators

Mechanical and durability properties of high-strength concrete containing steel and polypropylene fibers

Stabilization of residual soil with rice husk ash and cement

This paper investigates the properties of rice husk ash (RHA) produced by using a ferro-cement furnace. The effect of grinding on the particle size and the surface area was first investigated, then the XRD analysis was conducted to verify the presence of amorphous silica in the ash. Furthermore, the effect of RHA average particle size and percentage on concrete workability, fresh density, superplasticizer (SP) content and the compressive strength were also investigated. Although grinding RHA would reduce its average particle size (APS), it was not the main factor controlling the surface area and it is thus resulted from RHA's multilayered, angular and microporous surface. Incorporation of RHA in concrete increased water demand. RHA concrete gave excellent improvement in strength for 10% replacement (30.8% increment compared to the control mix), and up to 20% of cement could be valuably replaced with RHA without adversely affecting the strength. Increasing RHA fineness enhanced the strength of blended concrete compared to coarser RHA and control OPC mixtures.

Hilmi Bin Mahmud

Papers

Stabilization of residual soil with rice husk ash and cement

Study on properties of rice husk ash and its use as cement replacement material

Lightweight aggregate concrete fiber reinforcement – A review

Agricultural wastes as aggregate in concrete mixtures – A review

Prediction of splitting tensile strength of high-performance concrete