Mortar containing fly ash and rubber sawdust ash
ปูนสอผสมเถ้าลอยและเถ้าขี้เลื่อยไม้ยางพารา
Danupon Tonnayopas, Asst. Prof., D. of Mining and Materials Eng., F. of Eng., PSU.
Jirachat Chaosincharoen, Chai International Development Co., Bangkok
Corresponding e-mail : tdanupon@ratree.psu.ac.th
Grant : Faculty of Engineering, PSU.
Published : Songklanakarin J Sci Technol 2000, 22(4) : 489-500
Key words : fly ash, rubber sawdust ash, mortar
The mortar containing fly ash and rubber sawdust ash were proportioned in percentages of 20 and 40 by weight of cement. Specimens were divided into 3 curing periods at 7, 14 and 28 days. Ex-perimental investigation of physio-mechanical properties consisted of absorption, specific gravity, compressive strength, flexural strength, and acidic resistance using sulfuric acid.
Test results indicated that fly ash could be used for partial replacement of cement materials, especially in proportion of 40% at 28 days curing. The average water absorption was 5.83%, average specific gravity 2.05, average compressive strength 297.25 ksc, and average flexural strength 26.18
ksc. Sulfuric acid resistance of these mortars cured for 14 days indicated about 98.24%.
On the other hand, rubber sawdust ash mortar gave lower values than ones of fly ash mortar
in all conditions. The average water absorption was 1.82% and average specific gravity 1.82. Their average compressive strength was 63.28 ksc, average flexural strength 12.93 ksc and sulfuric acid resistance 95.26%.
Use of fly ash represents a significant development in concrete technology, especially in con-crete structure, while rubber sawdust ash is appropriate for lightweight aggregate which surface is
not exposed to chemical conditions.
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