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Effect of Magnesium Sulfate on Compressive Strength and Expansion of Mae Moh Fly Ash-Cement Based Material

Name: »ÃСÒÈ ·Í§»ÃÐä¾

Organization : ÁËÒÇÔ·ÂÒÅÑÂà·¤â¹âÅÂÕ¾ÃШÍÁà¡ÅéÒ¸¹ºØÃÕ. ¤³ÐÇÔÈÇ¡ÃÃÁÈÒʵÃì. ÀÒ¤ÇÔªÒÇÔÈÇ¡ÃÃÁâ¸Ò

keyword: à¶éÒ¶èÒ¹ËÔ¹

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Abstract: In this thesis, effect of magnesium sulfate attack on mortars and concretes mixed withfly ash from Mae Moh was studied. Fly ash was classified by air classifier into two differentfinenesses. The original fly ash and the two classififed fly ashes had specific surface area in termof Blaine of 3602, 6571, and 14671 cm2/g respectively. Each size of fly ash was used tosubstitute Portland cement type I of 20, 30,40, and 50 percent by weight. Fly ash-cement basedmaterial was mixed to form standard mortar cubes, concrete cylinders, and mortar bars of2 . 5 ~ 2 . 5 ~ 3cm0. All specimens were tested in three cases. Case I, the specimens were cured insaturated lime water. Case 11, the specimens were cured in saturated lime water for 28 days, thenimmersed in 5% of magnesium sulfate solution. Case 111, the specimens were immersed in themagnesium sulfate solution immediately after removing from the molds. Fly ash-cementspecimens were tested and compared with the specimens made from Portland cement type I andV. Compressive strength of standard mortar cubes and cbncrete cylinders were investigated at theage of 28, 63,91, 182 days while the expansion of the mortar bars were measured every 14 daysup to 476 days. The results showed that the mortars mixed with very fine fly ash and cured in saturatedlime water gave the highest compressive strength. The mortars cured in saturated lime water for28 days and immersed in magnesium sulfate solution (Case 11) had slightly lower compressivestrength than the ones immersed immediately in the sulfate solution (Case 111) up to the age of385 days.The expansion due to magnesium sulfate solution of fly ash-cement mortar bars in CaseI1 due to magnesium sulfate solution were lower than the ones in Case 111. The higher thereplacement of fly ash in cement based material, the expansion of mortar became lower. Theexpansion of mortar bars made froin Portland cement type V were lower than those made fromPortland cement type I. However, the mortar bars made from very fine fly ash and Portlandcement type I had lower expansion than the ones made from Portland cement type V. Inaddition, the mortar bars mixed with received fly ash expanded more than the mortars mixedwith classified fly ashes, in both Case I1 and 111. The effect of magnesium sulfate oncompressive strength of concrete was little up to the age of 406 days. This may be due to thesurface area of cementitious material in concrete is not as high as mortar and the use of fly ashV makes concrete more dense, less permeability, thus it is more difficuIt of sulfate to attack.

ÁËÒÇÔ·ÂÒÅÑÂà·¤â¹âÅÂÕ¾ÃШÍÁà¡ÅéÒ¸¹ºØÃÕ. ÊӹѡËÍÊÁØ´

Address: ¡Ãا෾ÁËÒ¹¤Ã

Email: info.lib@mail.kmutt.ac.th

Name: ªÑ ¨ÒµØþԷѡÉì¡ØÅ

Role: ÍÒ¨ÒÃÂì·Õè»ÃÖ¡ÉÒ

Name: ä¡ÃÇØ²Ô à¡ÕÂõÔâ¡ÁÅ

Role: ÍÒ¨ÒÃÂì·Õè»ÃÖ¡ÉÒ

Name: à͹¡ ÈÔÃÔ¾Ò¹Ôª¡Ã

Role: ÍÒ¨ÒÃÂì·Õè»ÃÖ¡ÉÒ

Created: 2541

Issued: 2007-02-07

Modified: 2553-10-11

ÇÔ·ÂÒ¹Ô¾¹¸ì/Thesis

ISBN: 9746244876

CallNumber: CVE990

tha

DegreeName: ÇÔÈÇ¡ÃÃÁÈÒʵÃÁËҺѳ±Ôµ

Level: »ÃÔ­­Òâ·

Descipline: ÇÔÈÇ¡ÃÃÁâ¸Ò

Grantor: ÁËÒÇÔ·ÂÒÅÑÂà·¤â¹âÅÂÕ¾ÃШÍÁà¡ÅéÒ¸¹ºØÃÕ

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