کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
259333 503632 2012 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Heat of hydration of blended cement containing treated ground palm oil fuel ash
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی عمران و سازه
پیش نمایش صفحه اول مقاله
Heat of hydration of blended cement containing treated ground palm oil fuel ash
چکیده انگلیسی

The aim of this paper is to study the heat of hydration of blended cement containing ground palm oil fuel ash and treated ground palm oil fuel ash (without unburned carbon), with and without superplasticizer (SP). The palm oil fuel ash (POFA) was ground in a ball mill to produce ground POFA (GPOFA). Unburned carbon, which is a major part of unburned residue in GPOFA, was removed by heat treatment at 500 °C for 1 h, producing treated GPOFA (TGPOFA). This result shows that the total heat of hydration of blended cement pastes containing GPOFA and TGPOFA are lower than OPC paste, proving that GPOFA and TGPOFA are good pozzolanic materials which can be used in massive concrete for preventing volume change and micro-cracks (caused by thermal stresses). Also, GPOFA and TGPOFA have low pozzolanic reactivity at the early hydration. However, TGPOFA has better pozzolanic reactivity than GPOFA due to its higher content of glassy phases. The hydration peak is retarded when SP is added into cement paste, but the total heat of hydration at the age of 7 days is no different even with the addition of SP.


► Unburned carbon in GPOFA was removed by heating at 500 °C for 1 h.
► SP affects only delaying the main peak of early stage of hydration of cement paste.
► GPOFA and TGPOFA have low pozzolanic reactivity at the early stage of hydration.
► GPOFA and TGPOFA can minimize the volume change and micro-cracks in concrete.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Construction and Building Materials - Volume 27, Issue 1, February 2012, Pages 78–81
نویسندگان
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