TY - JOUR ID - TI - The Synergic Effect of Fly Ash and High Reactivity Attapulgitein Ternary Blended Cement AU - Shubbar J. Al-Obaidey PY - 2019 VL - 37 IS - 12part (A) Engineering SP - 528 EP - 535 JO - Engineering and Technology Journal مجلة الهندسة والتكنولوجيا SN - 16816900 24120758 AB - The main objective of this study is to study the synergic effect of fly ash (FA) and high reactivity Attapulgite(HRA) when using them together in ternary blended cement of (OPC+FA+HRA) and evaluate the efficiency factor of FA and HRA in binary blended cement and (FA+HRA) in ternary blended cement. To achieve this objective compressive strength of binary blended cement mixes of (OPC+FA) with FA replacement percentages of (20 %, 30% and 40%), (OPC+HRA) with HRA replacement percentages of (5 and 10%) by weight of cement and ternary blended cement mixes of (OPC+FA+5% and/or 10%HRA) were tested and compared with that ofreference mix at ages of (7, 28, 56 and 90) days to assess the synergic effect of FA and HRA in ternary blended cement. The results showed that using ternary blended cement of (OPC+FA+5% and/or 10%HRA) led to increase compressive strength relative to binary blended cement mixes of (OPC+FA) at the same replacement percentages by weight of cement. More significant increments in compressive strength were noticed at age of 7 days. The results showed also that the efficiency factors calculated according to modified bolmoy ́s equation for ternary blended cement were always higher than their corresponding binary blended cement of (OPC+.FA).

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