Browsing by Author "Belew, Eyob"

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    Investigation of Calcite Fineness on the Physico-Mechanical Properties of Ordinary Portland Cement
    (2013-03) Belew, Eyob; Redi, Mesfin (PhD)
    The use of limestone as a partial rep lacement of Ordinary Portland Cement (OPC) has several advantages like Technical, Economical and Env ironmenta l. The present study aimed at investigating the phys ico-mechanical properties of fresh and hardened cement pastes of Portland limestone cement (PLC) made by blend ing clinker, gypsum and fined ca lc ite. Where the percentages of limestone are 0%, 5%, 10%, 15%, 20% and 25% by mass and the particle s izes are 6 11m, 12 11m, 18 11m and 24 11m used to replace a part of Ordinary Portland cement. The resuiting specimens were compared for, standard cons istency, sett ing time, so undness, and compress ive strength. Generally, the results show that as the Ca lcite fineness increase, the compress ive strengths of PLC also increases for some amount whereas, when the amount of fined calcite increases in PLC the compressive Strength of the mortars decreases. However, the specimens have competitive strength for the rep lacement value of Calc ite powder up to 20% by mass of clinker with particle s ize 6 11m, These represents a significant reduction o f energy, raw material consumption, costs and environmental advantages by reducing CO, emiss ion over ord inary Portland cements. Setting time, both init ial and final setting times, result were decreased with an increase Calcite in PLC. Furthermore, at the same level replacement, the cement pastes of 611m and 1211m of limesto ne show lower setting time than those us ing, I 811m and 24!lm, respective ly.