Received January 22 2013, Revised February 1 2013, Accepted March 7 2013
Copyright ⵑ 2013 by the Korean Society of Civil Engineers
ǣǣȀȀǤǤȀͳͲǤͳʹͷʹȀ ǤʹͲͳ͵Ǥ͵͵Ǥ͵ǤͻͲͻ Ǥ ǤǤ
ⶾ⯦#❊⛯㬚#PjR#⍂ᾎⴂ#㬦Ⳟ㬚#㫊ᴺⴲ⬞⢚#㔖㘪Ὢ㡶ⴖ#ⵣᏮ᷷⮎⛚ⴖ#
ᙲጪ㡷⛯
ୋࣲজ ȵౖਉ ȵଲֈࡣ
Bong-Seok Jang*, Seul-Woo Choi**, Kwang-Myong Lee***
Long-term Durability Characteristics of Fly ash Concrete Containing Lightly Burnt MgO Powder
ABSTRACT
Concrete containing lightly burnt MgO has long term expansibility. It also could compensate for the thermal shrinkage of mass concrete, because the hydration of MgO proceeds at a slow pace to long-term age. Thus, lightly burnt MgO has been applied to the construction of mass concrete such as dams. Recently, the expansion characteristics of MgO concrete with fly ash that could be applied to mass concrete for the reduction of hydration heat have been studied and however, limited studies on its durability. This study investigates the long-term durability characteristics of fly ash concrete with lightly burnt MgO. The durability tests on carbonation, freezing-thawing, diffusion of chloride, and resistance to sulfate attack were carried out for MgO concrete with curing for 360 days in submerged condition with different temperature of 20 and 50. The results reveal that MgO concrete shows a greater resistance of carbonation, diffusion of chloride, and resistance to sulfate attack. On the other hand the resistance of freezing-thawing was little influenced by MgO powder.
Key words : MgO, FA Concrete, Durability, Carbornation, Freezing and thawing
Ⅹಾ
ᱡ᪉ᨱᕽᗭᖒࡽᔑ⪵ษəօᇥัᮥ⊹⪹⦽MgO ⎹Ⓧญ✙۵ᰆʑᱢᯙ➞ᖒᮥaḥ݅. ੱ⦽MgO᮹ᙹ⪵ၹ᮲ᯕ۱ฑᗮࠥಽᰆʑᰍಚʭ ḡᯝᨕӹʑভྙᨱๅᜅ⎹Ⓧญ✙᮹᪉ࠥᙹ⇶ᮥ⬉ŝᱢᮝಽᅕᔢ⧁ᙹᯩ݅. ᕽᱡ᪉ᗭᖒ⦽MgO۵ๅᜅ⎹Ⓧญ✙Ǎ᳑ྜྷᯙݱᨱᵝಽᱢ ᬊࡹᨩ݅. ↽ɝᙹ⪵ᩕᱡqᮥ᭥⧕ๅᜅ⎹Ⓧญ✙ᨱฯᯕᔍᬊࡹ۵⥭ᯕᧁෝᔍᬊ⦽MgO ⎹Ⓧญ✙᮹➞✚ᖒᨱݡ⦽ᩑǍaḥ⧪ࡹᨕ
᪵ḡอᯕ్⦽⎹Ⓧญ✙᮹ԕǍᖒᨱš⦽ᩑǍ۵ᇡ᳒⦽ᝅᱶᯕ݅. ᯕᩑǍᨱᕽ۵⥭ᯕᧁ⎹Ⓧญ✙ᨱᱡ᪉ᗭᖒ⦽MgO ᇥัᮥ⊹⪹⦹ᩍ
MgO ᇥั⊹⪹ᨱෙᰆʑᰍಚᨱᕽ᮹ԕǍ✚ᖒᮥ⪶ᯙ⦹ᩡ݅. ᰍಚ360ᯝʭḡ20, 50ᨱᕽᙹᵲ᧲ᔾᮥᝅ⦽⬥┥ᔑ⪵, ࠺đᮖ⧕ၰᩝ
⪵ྜྷ⪶ᔑ, ⫊ᔑᩝ⋉⚍ᱡ⧎ᖒᮥ⠪a⦹ᩡ݅. ᝅ⨹đŝ, MgO ᇥัᮥ⊹⪹⦽⠙ᨱᕽ┥ᔑ⪵ᱡ⧎ᖒၰᩝ⧕ᱡ⧎ᖒ, ⫊ᔑᩝ⋉⚍ᱡ⧎ᖒᯕ݅
ᗭ⨆ᔢࡹ۵äᮥ⪶ᯙ⦹ᩡ݅. ၹ໕࠺đᮖ⧕ᱡ⧎ᖒᮡMgO ᇥั⊹⪹ᨱÑ᮹ᩢ⨆ᮥၼḡᦫᦹ݅.
áᔪᨕ ᔑ⪵ษəօ(MgO), FA ⎹Ⓧญ✙, ԕǍᖒ, ┥ᔑ⪵, ࠺đᮖ⧕
ࡓࡾν࣡ėॡ
Table 1. Properties of binders SiO2
(%) Al2O3
(%) MgO
(%) CaO
(%) SO3
(%) Fe2O3
(%) Insol.
(%) Blaine (g/cm3) Cement 21.60 6.00 3.40 61.40 2.50 3.10 0.21 3,539 Fly ash 67.80 18.27 0.80 3.17 2.40 2.40 - 3,234 MgO 1.56 0.34 93.58 1.21 0.08 0.40 7.80 -
Table 2. Properties of aggregates Gmax (mm)
Density (g/cm3)
Absorption
(%) Note
Fine aggregate - 2.60 1.07 Sea sand Gravel 1 25 2.70 0.44 Crushed rock Gravel 2 40 2.73 0.57 Crushed rock
Table 3. Mix proportions of concrete
Mix Type
Gmax (mm)
W/B (%)
S/a (%)
Unit weight (kg/m3)
W C FA MgO S G
12-0 40 65 52 175.0 215.4 53.8 0 928.7 900.2 12-5 175.0 201.9 53.8 13.5 928.9 900.3 24-0 25 48 48 165.0 275.0 68.8 0 837.6 942.3 24-5 165.0 257.8 68.8 17.2 837.8 942.6 45-0 25 35 46 165.0 377.1 94.3 0 749.9 914.2 45-5 165.0 353.6 94.3 23.6 750.2 914.6
1. ᕽು
ᱡ᪉ᨱᕽᗭᖒࡽᔑ⪵ษəօ(MgO) ᇥัᮥ⊹⪹⦽⎹Ⓧญ✙
۵MgO᮹ᙹ⪵ၹ᮲ᮥ☖⧕ᔾᖒࡹ۵ᙹᔑ⪵ษəօ(Mg(OH)2) ᯕMgO᪡H2Oᅕ݅ⓑᇡ⦝ෝaḡʑভྙᨱ➞ᖒᮥaḡí
ࡽ݅. ੱ⦽MgO᮹ᙹ⪵ၹ᮲ᯕ۱ฑᗮࠥಽᰆʑᰍಚʭḡᯝᨕӹ ʑভྙᨱə➞⬉ŝa4֥ᯕᔢḡᗮࡹᨕๅᜅ⎹Ⓧญ✙᮹᪉ࠥ
ᙹ⇶ᮥ ⬉ŝᱢᮝಽ ᅕᔢ⦹۵ äᮝಽ ᅕŁࡽ ၵ ᯩ݅(Du, 2005;
Mo et al., 2010; Liu et al., 1991; Gao et al., 2008; Lingling et al, 2005). ᕽᱡ᪉ᗭᖒ⦽MgO۵ๅᜅ⎹Ⓧญ✙Ǎ᳑ྜྷᯙ
ݱᨱᵝಽᱢᬊࡹᨩᮝ໑, ᙹ⪵ᩕᱡqᮥ᭥⧕ฯᯕᔍᬊࡹ۵⥭ᯕ ᧁ᪡ ⧉̹ ➞✚ᖒᨱ ݡ⦽ ᩑǍa ḥ⧪ࡹᨕ ᪵݅(Li, 1997;
1998). ⦹ḡอ ᯕ్⦽ ⥭ᯕᧁ ᔍᬊ ၰ MgO ᇥั ⊹⪹ᨱ
ෙ⎹Ⓧญ✙᮹ԕǍᖒᨱš⦽ᩑǍ۵ᇡ᳒⦽ᝅᱶᯕ݅. ᯝၹᱢᮝ ಽ⥭ᯕᧁ۵ᰆʑᰍಚᨱᕽ ᙹၡᖒၰԕǍᖒᮥ⨆ᔢ┅۵
äᮝಽಅᲙᯩᮝӹ(Kim et al., 1991; Lee et al., 1999; Naik et al., 1994), ᱡ᪉ᗭᖒ⦽MgO۵ᰆʑᱢᮝಽ➞ᖒᯕᮁḡࡹʑ
ভྙᨱ ᰆʑᰍಚᨱᕽ᮹ ԕǍᖒᮡ Ύ á☁⧕ ⧁ ᯙᯱᯕ݅.
⎹Ⓧญ✙᮹ԕǍᖒᮡǍ᳑ྜྷ᮹ᙹᮥđᱶ⦹۵ᵝᗭಽ
↽ɝᨱ۵⦽ĥᔢ┽ᖅĥᨱᕽ᪡zᯕǍ᳑ྜྷ᮹༊⢽ᙹᮥอ᳒
┅ʑ ᭥⦽ ԕǍᖒ á☁a Ǎ᳑ྜྷ ᖅĥ ݉ĥᨱᕽᇡ░ ᝅࡹŁ
ᯩ݅. ᕽᦿᮝಽ⎹Ⓧญ✙Ǎ᳑ྜྷᨱᱡ᪉ᗭᖒ⦽MgO ⎹Ⓧญ
✙᮹ᱢᬊᮥ᭥⧕ᕽ۵ԕǍᖒ⠪aaၹऽ⦥⦹íࢁäᮝಽ
❱݉ࡽ݅.
ᯕᩑǍᨱᕽ۵MgO ᇥั⊹⪹ᨱෙᰆʑᰍಚᨱᕽ᮹ԕǍ
✚ᖒᮥȽ⦹ʑ᭥⧕ᱡ᪉ᗭᖒ⦽MgO ᇥัᮥ5% ᙹᵡᮝಽ
ᖙaḡvࠥ᮹⥭ᯕᧁ⎹Ⓧญ✙႑⧊ᨱ⊹⪹⦹ᩍᰍಚ360 ᯝʭḡ20, 50ⳃᨱᕽᙹᵲ᧲ᔾᮥᝅ⦹ᩡ݅. ə⬥┥ᔑ⪵, ࠺đᮖ
⧕ ၰ ᩝ⪵ྜྷ ⪶ᔑ, ⫊ᔑᩝ ⋉⚍ ᱡ⧎ᖒᮥ ⠪a⦹ᩍ ə đŝෝ
MgO ᇥัᮥ⊹⪹⦹ḡᦫᮡ⥭ᯕᧁ⎹Ⓧญ✙᪡እƱ, ᇥᕾ⦹
ᩡ݅.
2. ᝅ⨹ᩑǍ
2.1 ୍߹
ᯕᩑǍᨱᕽ۵KS L 5201(⡍✡ऽູ✙)ᮥอ᳒⦹۵ǎԕ
Sᔍ᮹1᳦ູ✙(ၡࠥ : 3.14g/cm3)᪡ǎԕSᔍ᮹⥭ᯕᧁ(ၡ
ࠥ : 2.20g/cm3), ᵲǎ᮹ഭֶ⧕ᖒᨱᕽᙹญǍ᳑ྜྷᱥᬊᮝಽᱡ᪉
ᗭᖒ⦽MgO ᇥั(ၡࠥ : 3.56g/cm3)ᮥđ⧊ᰍಽᔍᬊ⦹ᩡᮝ໑, ə⪵⦺᳑ᖒၰྜྷญᱢᖒḩᮡTable 1ᨱᱶญࡹᨕᯩ݅. ⎹Ⓧญ✙
႑⧊ᨱᔍᬊ⦽ʼnᰍ᮹ᖒḩᮡTable 2ᨱᱶญ⦹ᩡ݅. ǖᮡʼnᰍ۵
⎹Ⓧญ✙᮹༊⢽vࠥᨱ↽ݡ⊹ᙹa݅ෙʼnᰍෝᔍᬊ⦹ᩡ
۵ߑ12MPaᯙ⎹Ⓧญ✙ᨱ۵↽ݡ⊹ᙹ40mm, 24MPaŝ45MPa ᯙ⎹Ⓧญ✙ᨱ۵↽ݡ⊹ᙹa25mm ᯙǖᮡʼnᰍෝᔍᬊ⦹ᩡ݅.
⪵⦺⪝⪵ᱽಽ۵ᮁ࠺ᖒ⪶ᅕ᪡Ŗʑప᳑ᱩᮥ᭥⦹ᩍǎԕHᔍ᮹
⡕ญ⋕ᅙᔑĥ Łᖒ܆ AE qᙹᱽෝ ᔍᬊ⦹ᩡ݅.
2.2 ࢼण
ᯕᩑǍᨱᕽ۵༊⢽vࠥ12, 24, 45MPa᮹ⅾ3aḡ႑⧊ᮥ
ʑᵡᮝಽ⥭ᯕᧁෝ20% ᙹᵡᮝಽ⊹⪹⦹ᩡ݅. MgO ᇥัᮡʑ
᳕ᩑǍᯙJang et al.,(2011) ၰDu(2005)᮹ᩑǍđŝෝₙŁ⦹ᩍ
ᱢᱶప᮹↽ݡ⊹ಽᔍഭࡹ۵đ⧊ᰍḩపእ5% ᙹᵡᮝಽ⊹⪹⦹ᩡ
ᮝ໑, ᝅ⨹ᨱᔍᬊ⦽6 ᳦ඹ᮹⎹Ⓧญ✙႑⧊እ۵Table 3ŝz݅.
2.3 ਓࢺ࣑
2.3.1 ࢼࢫվ׆߆౸୨
⎹Ⓧญ✙۵KS F 2425(ᝅ⨹ᝅᨱᕽ⎹Ⓧญ✙ഭෝอऽ۵
ႊჶ)ᨱᱽ᳑⦹ᩡᮝ໑, ⎹Ⓧญ✙᮹႑⧊eᮡMgO ᇥั᮹
Ɂḩᖒᮥ᭥⧕4ᇥᮝಽ⦹ᩡ݅. ŖʑపᮡKS F 2421(ᦶಆჶᨱ
᮹⦽ǔḡᦫᮡ⎹Ⓧญ✙᮹Ŗʑపᝅ⨹ႊჶ)ᨱ⊂ᱶ⦹ᩡ݅.
2.3.2 ਏඇ୪ୁࢫઑ
⎹Ⓧญ✙⠙ᮡbb᮹ԕǍᖒᝅ⨹᳑Õᨱ100 × 100
× 400mm᮹⮉༑ऽ᪡쨵 100 × 200mm᮹ᝅฑ༑ऽෝᔍᬊ⦹
ᩍᱽ᯲⦹ᩡ݅. ᱽ᯲⦽⠙ᮡ᪉ࠥa20 ± 1ⳃᯕŁ, ࠥa60
± 3 %ᯙ⧎᪉⧎ᝅᨱᕽ24e࠺ᦩ᧲ᔾ⦽⬥┩⩶ᮥᝅ⦹ᩡ
݅. ᯕ⬥ԕǍᖒᝅ⨹ᮥᝅ⧁ভʭḡ20, 50ⳃ᮹⧎᪉ᙹ᳑ᨱᕽ
ᰍಚ 360ᯝʭḡ ᙹᵲ ᧲ᔾᮥ ᝅ⦹ᩡ݅.
2.3.3 ॺฃ
┥ᔑ⪵ᝅ⨹ᬊ⠙ᮡ쨵 100 × 200mm᮹Ŗℕෝ쨵 100 × 100mm Ⓧʑಽᱩ݉⦹ᩍอॅᨩᮝ໑, ᝅ⨹ᮡKS F 2584(⎹Ⓧญ✙
᮹Ⅺḥ┥ᔑ⪵ᝅ⨹ႊჶ)ෝᙹ⧪⦹ᩡ݅. əญŁ┥ᔑ⪵⪹Ğ
י⇽⬥ᰍಚ28, 90, 180 ᯝᨱᕽKS F 2596(⎹Ⓧญ✙┥ᔑ⪵
ʫᯕ ⊂ᱶႊჶ)ᨱ ᮹⧕ ┥ᔑ⪵ ʫᯕෝ ⊂ᱶ⦹ᩡ݅.
2.3.4 ܛէଜැ
࠺đᮖ⧕ ᝅ⨹ᮡ 100 × 100 × 400mm ⠙ᮥ ᔍᬊ⦹ᩍ KS F 2456(ɪᗮ ࠺đ ᮖ⧕ᨱ ݡ⦽ ⎹Ⓧญ✙᮹ ᱡ⧎ ᝅ⨹ ႊჶ)᮹
ႊჶB(ʑᵲɪᗮ࠺đ⬥ᙹᵲᮖ⧕ᝅ⨹ႊჶ)ᨱᝅ⦹ᩡ݅.
ᝅ⨹᮹đŝ۵KS F 2437(Ŗḥ࠺ᨱ᮹⦽⎹Ⓧญ✙᮹࠺┥ᖒ
ĥᙹၰ⣙ᦥᘂእᝅ⨹ႊჶ)ᨱ᮹⧕⠙᮹࠺┥ᖒĥᙹෝ⊂ᱶ⦹ᩍ
݅ᮭ᮹ ᮥ ᯕᬊ⦹ᩍ ᔢݡ ࠺┥ᖒ ĥᙹಽ ӹ┡ԕᨩ݅.
©ƁÞÜß á Þćƌ×Ï ƌƁÏ
ß Z Î×× (1)
ᩍʑᕽ, ©Ɓ۵ ࠺đ ᮖ⧕ C ᔍᯕⓕ ⬥᮹ ᔢݡ ࠺┥ᖒ ĥᙹ, ƌ×۵ ࠺đ ᮖ⧕ 0 ᔍᯕⓕᨱᕽ᮹ ᄡ⩶ ḥ࠺᮹ 1₉ Ŗ ḥ࠺ᙹ
(⼹), ƌƁ۵࠺đᮖ⧕C ᔍᯕⓕ⬥᮹ᄡ⩶ḥ࠺᮹1₉Ŗḥ࠺ᙹ
(⼹)ᯕ݅.
2.3.5 સীଲคॺծ
ᩝᗭᯕ᪉⪶ᔑᝅ⨹ᮡ쨵 100 × 200mm᮹Ŗℕෝɐ 100 × 50mm Ⓧʑಽ ᱩ݉⦹ᩍ ḥ⧪⦹ᩡ݅. ᝅ⨹ᮡ NT Build 492ᮥ
ᝅ⦹ᩡᮝ໑, ᧲ɚᬊᧂᮡ0.3N NaOHᮥᔍᬊ⦹ᩡŁᮭɚᬊ ᧂᮡ10% NaClᮥᔍᬊ⦹ᩡ݅. ᩝᗭᯕ᪉᮹⋉⚍ʫᯕ۵KS F 2737(ḡ᧞ᨱ᮹⦽⎹Ⓧญ✙᮹ᩝ⪵ྜྷ⋉⚍ʫᯕ⊂ᱶႊჶ)ᨱ
⊂ᱶ⦹ᩡᮝ໑, əđŝෝ݅ᮭ᮹ᨱݡ᯦⦹ᩍᩝᗭᯕ᪉⪶ᔑĥ ᙹෝ ᔑᱶ⦹ᩡ݅.
ƌƑƑƋá ć×í×ÏÐÖÞÏÔÐ âߥޮ àÏ߃ ÞƖƂà ×í×ÏÐÕöććÞÏÔÐ âߥƖ® à Ï Ƃß
ᩍʑᕽ, ƌƑƑƋ۵ᩝᗭᯕ᪉⪶ᔑĥᙹ(×10-12 m2/s), U۵aᯙ
ᱥᦶ᮹ᱩݡs(V), T۵⊂ᱶᱥ⬥᮹ᬊᧂ᮹⠪Ɂ᪉ࠥ(ⳃ), Lᮡ
⠙᮹ࢱ̹(mm), ƖƂ۵ᩝᗭᯕ᪉᮹⋉⚍ʫᯕ(mm), ƒ۵ᝅ⨹ḡᗮ
e(hour)ᯕ݅.
2.3.6 จॺસୠාন
⫊ᔑᩝᱡ⧎ᖒᝅ⨹ᨱݡ⦽ȽĊᮡǎԕᨱᦥḢᱽᱶࡹᨕᯩḡ
ᦫʑভྙᨱᯝᅙÕᰍᝅ⨹ᖝ░ᨱᕽᱽᱶ⦽JSTM C 7401(⎹Ⓧญ
✙᮹ᬊᧂ⋉ḡᨱ᮹⦽ԕ᧞⣩ᖒᝅ⨹ႊჶ)ᨱ᮹⦹ᩍ⫊ᔑᩝ⋉⚍
ᱡ⧎ᖒ ᝅ⨹ᮥ ᙹ⧪⦹ᩡ݅. ḩపᄡ⪵۵ 100 × 100 × 400mm᮹
⠙ᮥᔍᬊ⦹ᩡᮝ໑, ᦶ⇶vࠥᄡ⪵۵ɐ 100 × 200mm Ⓧʑ᮹
⠙ᮥᔍᬊ⦹ᩍšₑ⦹ᩡ݅. ⠙ᮥ10% ⫊ᔑӹ✙ᨱ⋉ḡ⦹ᩍ
⋉ḡᱥ⬥ḩపᄡ⪵ၰᦶ⇶vࠥ᮹ᄡ⪵ෝšₑ⦹ᩡᮝ໑, đŝ۵
⋉ḡᱥ⠙᮹ḩపၰᦶ⇶vࠥᨱݡ⦽ᄡ⪵ᮉಽӹ┡ԕᨩ݅.
3. đŝၰᇥᕾ
3.1 վ׆߆
Fig. 1ᨱӹ┡ԙŖʑప⊂ᱶđŝෝᅕ໕MgO ᇥัᮥ⊹⪹⦽
⎹Ⓧญ✙(MgO-5)᮹ŖʑపᮡMgO ᇥัᮥ⊹⪹⦹ḡᦫᮡ⎹Ⓧญ
✙(MgO-0)᪡እƱ⦹ᩍ݅ᗭ₉ᯕෝӹ┡ԩ݅. ⦹ḡอəჵ᭥۵
- 0.4 ~ + 0.2 % ᙹᵡᮝಽMgO ⊹⪹ᨱෙŖʑప᮹᷾a⪚ᮡ
qᗭaⓍḡᦫʑভྙᨱMgO ⊹⪹ᯕ⎹Ⓧญ✙᮹Ŗʑపᨱၙ⊹۵
ᩢ⨆ᮡ ၙၙ⦽ äᮝಽ ❱݉ࡽ݅.
3.2 ౠԳܑ
bb᮹⠙ᮥ༊⢽vࠥ - MgO ⊹⪹ශ - ᧲ᔾ᪉ࠥ᮹ᙽᕽಽ
ᱶญ⦹ᩍᦶ⇶vࠥෝFig. 2ᨱᱶญ⦹ᩡ݅. ᰍಚ28ᯝᨱᕽMgO-5
(a) 12MPa
(b) 24MPa
(c) 45MPa
Fig. 2. Compressive strength of concretes
᮹ᦶ⇶vࠥaMgO-0ᨱእ⧕݅ᗭԏíšₑࡹᨩ݅. ၹ໕ᰍಚ
360ᯝᨱᕽ۵MgO-5᮹ᦶ⇶vࠥaMgO-0ᨱእ⧕᧞e׳Ñӹ
እ⦹íӹ┡ԍᮝ໑, ᯕ۵ᰆʑᰍಚᨱᕽMgO᮹➞ᮝಽᯙ⦽
Ŗɚ∊ᱥ⬉ŝᨱʑᯙ⦽äᮝಽᔍഭࡽ݅(Liu et al., 1992; Jang et al., 2011; Salomao et al., 2007).
ᰍಚ28ᯝᨱᕽ50ⳃᨱᕽ᧲ᔾ⦽⠙᮹Ğᬑ20ⳃᨱᕽ᧲ᔾ⦽
⠙ᅕ݅ᱥၹᱢᮝಽ׳ᮡᦶ⇶vࠥෝӹ┡ԩ݅. ၹ໕ᰍಚ360ᯝ ᨱᕽ۵ᱡvࠥ⎹Ⓧญ✙ᯙ12MPa ⎹Ⓧญ✙ෝᱽ⦹Ł50ⳃᨱᕽ
᧲ᔾ⦽⠙ᯕ20ⳃᨱᕽ᧲ᔾ⦽⠙ᅕ݅ԏᮡᦶ⇶vࠥෝᅕᩡ݅.
ᯝၹᱢᮝಽ Ł᪉ᨱᕽ ᧲ᔾ⦽ ⎹Ⓧญ✙᮹ Ğᬑ Ⅹʑ ෙ ᙹ⪵
ᗮࠥಽᯙ⧕⎹Ⓧญ✙᮹vࠥ᷾aaዉḡḡอᙹ⪵ᔾᖒྜྷ᮹
ᇩȽ⊺⦽⪶ᔑᮝಽŖɚශၰၙᖙɁᩕ᮹᷾aಽᰆʑvࠥaᱡ⦹
ࡽ݅Ł ಅᲙ ᯩ݅(Kim et al., 1998). ᕽ ᯕ్⦽ ᯕᮁಽ
Ł᪉ᨱᕽ᧲ᔾ⦽⎹Ⓧญ✙᮹ᰆʑvࠥaᱡ⦹ࡹ۵äᮝಽᔍഭࡽ
݅. ၹ໕12MPa᮹ĞᬑŁ᪉᧲ᔾᮝಽᯙ⦽ᰆʑᰍಚᨱᕽ᮹vࠥ
ᱡ⦹ᅕ݅Ⅹʑvࠥᔢ⡎ᯕⓍʑভྙᨱᔢݡᱢᮝಽŁ᪉᧲ᔾ ᮝಽᯙ⦽vࠥᱡ⦹aӹ┡ӹḡᦫᮡäᮝಽ❱݉ࡽ݅. ੱ⦽ᱥℕᱢ ᮝಽMgO-5aMgO-0ᅕ݅׳ᮡᦶ⇶vࠥෝᅕᩡ۵ߑ, ᯕ్⦽
đŝಽᇡ░Ł᪉ᨱᕽࠥMgO ᇥั⊹⪹ᨱෙᰆʑᰍಚᨱᕽ᮹
vࠥ ᷾ḥ⬉ŝෝ ᮥ ᙹ ᯩᮥ äᮝಽ ❱݉ࡽ݅.
3.3 ॺฃ
ᰍಚ360ᯝʭḡ᧲ᔾ⦽⎹Ⓧญ✙⠙ᮥ5% CO2⪹Ğᨱי⇽
⦽⬥28, 90, 180ᯝᨱᕽ᮹┥ᔑ⪵⋉⚍ʫᯕෝFig. 3ᨱӹ┡ԕᨩ
݅. ⎹Ⓧญ✙᮹┥ᔑ⪵۵ྜྷ-đ⧊ᰍእ, ⪝⪵ᰍ॒ᨱᩢ⨆ᮥၼᮝ ໑, W/BaⓕᙹಾŖɚශၰᖙŖᬊᧂᯕ᷾a⦹ᩍ┥ᔑ⪵ᨱ≉᧞
⦹íࡽ݅(Choi et al., 2009; Oh et al., 2003). ᝅ⨹đŝW/Ba
ԏᮥᙹಾᯕᔑ⪵┥ᗭ᮹⋉⚍ᗮࠥa۱ญíӹ┡ԍᮝ໑, ✚⯩45MPa
⎹Ⓧญ✙᮹Ğᬑᨱ۵┥ᔑ⪵⪹Ğי⇽⬥28ᯝ࠺ᦩ┥ᔑ⪵a
ḥ⧪ࡹḡ ᦫᦹ݅.
CO2 ⪹Ğᨱ י⇽ ⬥ 180ᯝʭḡ ᰍಚᯕ ᷾a⧁ᙹಾ ┥ᔑ⪵
⋉⚍ʫᯕ᷾a⡎ᯕqᗭ⦹۵äᮥ⪶ᯙ⧁ᙹᯩᨩᮝ໑, MgO-5᮹
Ğᬑ᧲ᔾ᪉ࠥ᪡ྕš⦹íᱥᰍಚᨱᕽMgO-0ᅕ᯲݅ᮡ┥ᔑ⪵
ʫᯕෝ ᅕᩡ݅. ᯕෝ ☖⧕ ∊ᇥ⦽ ᰍಚ࠺ᦩ ᧲ᔾᮥ Ñ⋁ Ğᬑ,
ᷪ ᰆʑᰍಚᨱᕽ ᱡ᪉ ᗭᖒ⦽ MgO ᇥัᯕ ⎹Ⓧญ✙᮹ ┥ᔑ⪵
ᱡ⧎ᖒᮥ⨆ᔢ┅۵äᮥᙹᯩ݅. ᯕ۵MgO᮹➞⬉ŝෝ
☖⧕ᵝᄡູ✙⟹ᯕᜅ✙᮹ၙᖙǍ᳑aၡᝅ⧕ḱᮝಽ៉Ŗɚශ
ၰၙᖙŖɚ᮹ᇥ⡍ᨱᩢ⨆ᮥᵝʑভྙᮝಽ❱݉ࡽ݅(Liu et al., 1991; Choi et al., 2011).
50ⳃᨱᕽ᧲ᔾ⦽⎹Ⓧญ✙᮹Ğᬑ20ⳃᨱᕽ᧲ᔾ⦽⎹Ⓧญ✙ᨱ
እ⧕ᱥℕᱢᮝಽ┥ᔑ⪵⋉⚍ʫᯕa᯲íӹ┡ԍ݅. ੱ⦽MgO-5 ᮹┥ᔑ⪵⋉⚍ᗮࠥaMgO-0ᅕ݅۱ญíšₑࡹᨕ50ⳃᨱᕽ
᧲ᔾ⦽ MgO-5a aᰆ ᯲ᮡ ┥ᔑ⪵ ⋉⚍ ʫᯕෝ ᅕᩡ݅. ᯕ۵
Ł᪉᧲ᔾᮥ☖⧕MgOᇥั᮹ᙹ⪵ၹ᮲ᯕⅪḥࡹᨕᙹ⪵ᔾᖒྜྷ
(a) 12MPa
(b) 24MPa
(c) 45MPa
(a) 12MPa
(b) 24MPa
(c) 45MPa ᔾᖒᨱෙŖɚශqᗭಽᯙ⦽äᮝಽ❱݉ࡽ݅(Amaral et al.,
2010; Liu et al., 1991).
3.4 ܛէଜැ
Fig. 4ᨱ ᔢݡ ࠺┥ᖒ ĥᙹෝ ༊⢽ vࠥᨱ ӹ┡ԕᨩ݅.
(a) 12MPa
(b) 24MPa
(c) 45MPa
Fig. 5. Chloride diffusion coefficient of concrete after 1 year ᩑǍᨱᔍᬊ⦽⎹Ⓧญ✙႑⧊᮹Ŗʑప⊂ᱶđŝෝ☖⧕W/B᪡
MgO⊹⪹ᨱෙᩑ⧪Ŗʑప᮹₉ᯕaⓍḡᦫᮡäᮥ⪶ᯙ⦹ᩡ
݅. ᕽ႑⧊᮹ᩑ⧪Ŗʑప᮹᯲ᮡ₉ᯕa࠺đᮖ⧕ᝅ⨹đŝᨱ
ᩢ⨆ᮥ ᵝḡ ᦫᮭᮥ ᙹ ᯩ݅.
ᝅ⨹ đŝᨱ ໕ W/Bᨱ ᔢݡ ࠺┥ᖒ ĥᙹ᮹ qᗭ
⡎ᯕ݅íӹ┡ԍᮝ໑, Łvࠥ⎹Ⓧญ✙ᨱᕽ࠺đᮖ⧕ᱡ⧎ᖒᯕ
Ⓧíӹ┡ԍ݅. ੱ⦽vࠥᄥಽMgO-0᪡MgO-5᮹ᔢݡ࠺┥ᖒ
ĥᙹqᗭĞ⨆ᯕɝᔍ⦹íӹ┡ԍ݅. 20ⳃᨱᕽ᧲ᔾ⦽12-5᮹
Ğᬑ12-0ŝእƱ⦹ᩍ100, 200 cycleᨱᕽ݅ᗭ⨆ᔢࡽ࠺đᮖ⧕
ᱡ⧎ᖒᮥᅕᩡᮝӹ300 cycleᨱᕽ࠺ᯝ⦽ᔢݡ࠺┥ᖒĥᙹෝӹ
┡ԕᨩ݅. 50ⳃᨱᕽ᧲ᔾ⦽⠙ᩎ20ⳃᨱᕽ᧲ᔾ⦽⠙ŝ
እ⦽࠺đᮖ⧕ᱡ⧎ᖒᮥӹ┡ԩᮝ໑, ᯕ్⦽Ğ⨆ᮡ24, 45MPa
⎹Ⓧญ✙ᨱᕽ࠺ᯝ⦹íšₑࡹᨩ݅. ᕽ⎹Ⓧญ✙᮹࠺đᮖ⧕
ᱡ⧎ᖒᮡMgO ᇥั᮹⊹⪹ᨱⓑᩢ⨆ᮥၼḡᦫ۵äᮝಽ❱݉ࡽ
݅. ᯝၹᱢᮝಽMgO ⊹⪹ᨱ⎹Ⓧญ✙᮹ŖɚශၰŖɚᇥ⡍a
ᩢ⨆ᮥၼ۵äᮝಽಅᲙᯩ݅. ⦹ḡอ5쩋m ᯕᔢ᮹ⓑŖɚᮡ
MgO ⊹⪹ᨱ ෙ Ŗɚ ᄡ⪵ᨱ ⓑ ᩢ⨆ᮥ ၼḡ ᦫ۵݅(Mo et al., 2012). ᕽ ⎹Ⓧญ✙᮹ ԕ࠺⧕ ᱡ⧎ᖒᨱ ᵲ⦽ 50쩋m ᯕᔢ᮹ࠦพࡽŖɚᮡMgO ⊹⪹ᨱෙᩢ⨆ᮥÑ᮹ၼḡᦫʑ
ভྙᨱ MgO ⊹⪹ᨱ ෙ ࠺đᮖ⧕ ᱡ⧎ᖒ᮹ ₉ᯕa ӹ┡ӹḡ
ᦫᮡ äᮝಽ ❱݉ࡽ݅.
3.5 સীଲคॺծ
ᩝᗭᯕ᪉⪶ᔑĥᙹᝅ⨹ᮥ☖⧕ᮡđŝෝ༊⢽vࠥᨱ
Fig. 5ᨱ ᱶญ⦹ᩍ ӹ┡ԕᨩ݅. ᩝᗭᯕ᪉ ⪶ᔑĥᙹ۵ ⎹Ⓧญ✙
ԕᇡၙᖙǍ᳑ၰŖɚᨱᩢ⨆ᮥฯᯕၼʑভྙᨱW/Bᨱ
Ⓧíݍḥ݅. ᝅ⨹đŝW/BaⓑᱡvࠥᨱᕽW/Ba᯲ᮡŁv
ࠥಽiᙹಾᩝᗭᯕ᪉⪶ᔑĥᙹa⩥ᱡ⯩᯲ᦥᲭᮝ໑, ༊⢽vࠥ
ၰ᧲ᔾ᪉ࠥ᪡ྕš⦹í༉ुMgO-5aMgO-0ᨱእ⧕ԏᮡᩝᗭ ᯕ᪉⪶ᔑĥᙹෝӹ┡ԕ۵äᮝಽᅕᦥMgO ᇥั⊹⪹ᨱ
ᩝ⧕ ᱡ⧎ᖒᯕ ݅ᗭ ⨆ᔢࡹ۵ äᮝಽ ᔍഭࡽ݅.
50ⳃᨱᕽ᧲ᔾ⦽Ğᬑ12MPa ⎹Ⓧญ✙ෝᱽ⦹Ł༉ु⠙
ᨱᕽᩝ⧕ᱡ⧎ᖒᯕ݅ᗭᱡ⦹ࡽđŝෝӹ┡ԩ݅. ᯕ۵⎹Ⓧญ✙
ᦶ⇶vࠥ᪡ ࠺ᯝ⦽ Ğ⨆ᮝಽ ⎹Ⓧญ✙᮹ Ŗɚශ ၰ Ŗɚ Ⓧʑ
ᇥ⡍aᦶ⇶vࠥၰᩝᗭᯕ᪉⪶ᔑᗮࠥ᪡׳ᮡᔢššĥෝaḡʑ
ভྙᮝಽ ❱݉ࡽ݅(Yoon et al., 2005; Kim et al., 2007).
3.6 จॺસୠාন
⫊ᔑᩝ ⋉ḡ ᱥ⬥ ḩపᄡ⪵ ၰ ᦶ⇶vࠥ᮹ እෝ Fig. 6 ၰ
Table 4ᨱᱶญ⦹ᩍӹ┡ԕᨩ݅. ⪵⦺ᱢ⋉ᮡ᪉ࠥ, đ⧊ᰍ᮹
᳦ඹၰ᧲, ྜྷ-đ⧊ᰍእ(W/B) ၰ᧲ᔾʑe॒᮹ᩍ్ᯙᯱॅ᮹
ᩢ⨆ᮥၼ۵äᮝಽಅᲙᯩ݅(Bae et al., 2010). ᝅ⨹đŝෝ
ᔕ⠕ᅕ໕W/Baԏᮥᙹಾ⋉ḡᱥ⬥ḩపᄡ⪵ၰᔢݡᦶ⇶vࠥ᮹
ᄡ⪵a᯲íӹ┡ӹ۵äᮥᙹᯩ۵ߑ, ᯕ۵W/Baԏᮥᙹಾ
ᙹၡᖒᯕ᷾a⦹Ł⊹ၡ⦽ၙᖙǍ᳑ෝaḡအಽ ⫊ᔑӹ✙⋉
⚍᮹ ᩕ⪵ ḥ⧪ᯕ ۱ญí ᯝᨕӽ äᮝಽ ❱݉ࡽ݅.
(a) 12MPa
(b) 24MPa
(c) 45MPa
Fig. 6. Relative compressive strength of concrete after 1 year
Table 4. Mass change of concrete after 1 year (%) Exposed
Type days 90 days 180 days
12-0-20 2.9 3.3
12-5-20 1.4 1.8
12-0-50 2.8 3.1
12-5-50 1.1 1.4
24-0-20 1 1.3
24-5-20 1.1 1.4
24-0-50 1.1 1.5
24-5-50 1.2 1.6
45-0-20 0.9 1.2
45-5-20 0.8 1
45-0-50 0.8 1.1
45-5-50 0.7 1
⫊ᔑᩝ ⋉ḡ ⬥ ᰍಚ 180ᯝᨱᕽ᮹ ḩపᄡ⪵ෝ ᔕ⠕ᅕ໕, ༊
⢽vࠥၰ᧲ᔾ᪉ࠥ᪡šĥᨧᯕ༉ुMgO-5aMgO-0ᅕ݅እ
⦹Ñӹ݅ᗭ᯲ᮡḩపᄡ⪵ᮉᯕšₑࡹᨩ݅. ✚⯩12MPa᮹Ğᬑ
MgO-5 ⠙ᯕ1.5% ᯕᔢḩపᄡ⪵ᱡ⧎ᖒᯕ⨆ᔢࡽၹ໕24, 45MPa⎹Ⓧญ✙᮹ĞᬑMgO-5ŝMgO-0ᯕእ⦽ḩపᄡ⪵ᮉ
ᮥᅕᩡ݅. ੱ⦽⋉ḡ⬥ ᰍಚ180ᯝᨱᕽ᮹ᦶ⇶vࠥ᮹ᄡ⪵ෝ
ᔕ⠕ᅕ໕, ༉ुMgO-5ᨱᕽvࠥᱡ⦹a᯲íӹ┡ԍ݅. ᯕ్⦽
ᝅ⨹đŝಽᇡ░MgO ᇥั᮹⊹⪹ᮝಽᯙ⦹ᩍ⫊ᔑᩝᱡ⧎ᖒᯕ
⨆ᔢࡹ۵äᮥ⪶ᯙ⧁ᙹᯩᮝ໑, ✚⯩ᱡvࠥ⎹Ⓧญ✙ᨱᕽ⫊ᔑᩝ
ᱡ⧎ᖒ⨆ᔢ⬉ŝaⓍíӹ┡ӹ۵äᮥᙹᯩ݅. ੱ⦽50ⳃᨱᕽ
᧲ᔾ⦽Ğᬑ, ᱥၹᱢᮝಽ20ⳃᨱᕽ᧲ᔾ⦽⠙ᅕ݅ⓑᩝᗭᯕ᪉
⪶ᔑĥᙹෝӹ┡ԩᮝӹ, MgO-5ᨱᕽᔢݡᱢᯙ⫊ᔑᩝᱡ⧎ᖒ⨆ᔢ
ᮥ ⪶ᯙ⧁ ᙹ ᯩ݅.
4. đು
ᯕᩑǍᨱᕽ۵MgO ᇥัᮥ⊹⪹⦹ḡᦫᮡFA ⎹Ⓧญ✙(MgO-0)
᪡MgO ᇥัᮥ5% ᙹᵡᮝಽ⊹⪹⦽⎹Ⓧญ✙(MgO-5)ᨱݡ⦹ᩍ
ᰆʑᰍಚᨱᕽ᮹ԕǍᖒ⠪aෝ᭥⧕ᰍಚ360ᯝʭḡbb20, 50ⳃಽᮁḡࡹ۵⧎᪉ᙹ᳑ᨱᕽ᧲ᔾ⦽अ┥ᔑ⪵, ࠺đᮖ⧕, ᩝ⪵ྜྷ
⪶ᔑၰ⫊ᔑᩝ⋉ḡᝅ⨹ᮥᝅ⦹ᩡᮝ໑, ݅ᮭŝzᮡđುᮥ
ᨩ݅.
(1) MgO-5 ⎹Ⓧญ✙᮹ᦶ⇶vࠥ۵MgO-0᪡እƱ⦹ᩍⅩʑᰍಚ ᨱᕽ۵ vࠥ ᱡ⦹a ӹ┡ԍḡอ ᰍಚ 360ᯝᨱᕽ۵ MgO-0 ᅕ݅ ݅ᗭ ׳ᮡ ᦶ⇶vࠥෝ ӹ┡ԩ݅.
(2) MgO-5ᨱᕽ┥ᔑ⪵⋉⚍ᗮࠥaqᗭ⦹ᩡᮝ໑, ✚⯩ʑ᳕᮹ᩑ Ǎđŝ᪡እƱ⦹ᩍMgO-5᮹┥ᔑ⪵ᱡ⧎ᖒᯕⓍí⨆ᔢࡽ
ᨱᕽ⎹Ⓧญ✙᮹┥ᔑ⪵ᱡ⧎ᖒᮥ⨆ᔢ┅۵äᮝಽᔍഭࡽ݅.
(3)࠺đᮖ⧕ᝅ⨹đŝMgO-0᪡MgO-5᮹࠺đᮖ⧕ᱡ⧎ᖒᮡ
እ⦽ᙹᵡᮝಽšₑࡹᨩ݅. ᯕ۵⎹Ⓧญ✙᮹ԕ࠺⧕ᱡ⧎ᖒ ᨱ ᵲ⦽ 50쩋m ᯕᔢ᮹ ࠦพࡽ Ŗɚᯕ MgO ⊹⪹ᨱ ෙ
ᩢ⨆ᮥ Ñ᮹ ၼḡ ᦫʑ ভྙᮝಽ ❱݉ࡽ݅.
(4) MgO-5᮹ᩝᗭᯕ᪉⪶ᔑĥᙹa᯲íšₑࡹᨩᮝ໑, ⫊ᔑᩝ
⋉ḡᱥ⬥MgO-5ᨱᕽḩపᄡ⪵ၰvࠥᗱᝅᯕMgO-0ᨱᕽ
࠺॒ੱ۵݅ᗭ᯲íӹ┡ԍ݅. ੱ⦽ᱡvࠥᯙ12MPa ⎹Ⓧญ✙
ᨱᕽMgO ᇥั⊹⪹ᨱෙᩝ⧕ᱡ⧎ᖒၰ⫊ᔑᩝᱡ⧎ᖒᯕ
Ⓧí ⨆ᔢࡹ۵ äᮥ ⪶ᯙ⧁ ᙹ ᯩᨩ݅. ᕽ ᱡ᪉ᗭᖒ⦽
MgO ᇥั᮹⊹⪹ᯕᰆʑᰍಚᨱᕽ᮹⎹Ⓧญ✙᮹ᩝ⧕ᱡ⧎ᖒ
ၰ⫊ᔑᩝᱡ⧎ᖒᮥ⨆ᔢ┅۵äᮝಽᔍഭࡹ໑, ✚⯩ᱡvࠥ
⎹Ⓧญ✙ᨱᕽ ⓑ ⬉ŝෝ ᮥ ᙹ ᯩ۵ äᮝಽ ❱݉ࡽ݅.
qᔍ᮹ɡ
ᅙ ᩑǍ۵ ǎ☁⧕᧲ᇡ Õᖅʑᚁ⩢ᝁᔍᨦ(09ʑᚁ⩢ᝁF03)᮹
ᩑǍእḡᬱᨱ᮹⧕ᙹ⧪ࡹᨩᮝ໑, ᯕᨱšĥᯱᩍ్ᇥ̹qᔍऽพ ܩ݅.
References
Amaral, L. F., Oliveira, I. R., Salomao, R., Frollini, E., Randolfelli, V. C. (2010). “Temperature and common-ion effect on magnesium oxide (MgO) hydration.” Ceramics International, Vol. 36, No. 3, pp. 1047-1054.
Bae, S. H., Park, J. I., Lee, K. M. (2010). “Influence of mineral admixture on the resistance to sulfuric acid and sulfate attack in concrete.” Journal of the Korea Concrete Institute, Vol. 22, No.
2, pp. 219-228 (in Korean).
Choi, S., Lee, K. M., Jung, S. H., Kim, J. H. (2009). “A study on the carbonation characteristics of fly ash concrete by accelerated carbonation test.” Journal of the Korea Concrete Institute, Vol.
21, No. 4, pp. 449-455 (in Korean).
Choi, S. W., Kim, J. H., Lee, K. M., Kwon, Y. G., Jang, B. S. (2011).
“Durability characteristics of concrete containing lightly burnt MgO powder.” Journal of the Korea Concrete Institute, Vol. 23, No. 5, pp. 609-615 (in Korean).
Du, C. (2005). “A Review of magnesium oxide in concrete.”
Concrete International, Vol. 27, No. 12, pp. 45-50.
Gao, P., Wu, S., Lu, X., Deng, M., Lin, P., Wu, Z., Tang, M. (2007).
“Soundness evaluation of concrete with MgO.” Construction and Building Materials 21, Vol. 21, No. 1, pp. 132-138.
Gao, P., Geng, F., Hou, J., Li, X., Lin, H., Lu, X., Shi, N. (2008).
“Production of MgO-type expansive agent in dam concrete by use of industrial by-products.” Building and Environment. Vol.
43, No. 4, pp. 453-457.
Jang, B. S., Kwon, Y. G., Choi, S. W., Lee. K. M. (2011). “Funder-
mental peoperties of cement composites containing lightly burnt MgO powders.” Journal of the Korea Concrete Institute, Vol. 23, No. 2, pp. 225-233 (in Korean).
Kim, J. K., Moon, Y. H., Eo, S. H., Choi, E. K. (1998). “The effect of different curing time and temperature on compressive strength of concrete.” Journal of the Korea Concrete Institute, Vol. 10, No.3, pp. 143-152 (in Korean).
Kim, J. K., Park, Y. D., Sung, K. Y. (1991). “The long-term strength and the workability of high-strength fly ash concrete.” Journal of the Korea Concrete Institute, Vol. 3, No. 4, pp. 107-115 (in Korean).
Kim, N. W., Yeo, D. G., Song, J. J., Bae, J. S. (2007). “A study on the characteristic of capillary pore and chloride diffusivity by electrical difference of high-strength concrete using metakaolin.”
Journal of the Korea Concrete Institute, Vol. 19, No. 4, pp. 499- 506 (in Korean).
Lee, C. Y., Choi, S. H., Kang, S. H., Lee, K. M. (1999). “Influence of fly ash content with respect to the fresh and mechanical properties in concrete.” Journal of the Korea Concrete Institute, Vol. 11, No. 6, pp. 25-33 (in Korean).
Li, C. M. (1997). “Effect of fly ashes on deformation and mechanic properties of MgO concrete.” Study on Hydroelectric Engineering, pp. 1-9 (in Chinese).
Li, C.M. (1998). “Long-term self-volume deformation of concrete with MgO.” Hydro power Generation, pp. 53-57 (in Chinese).
Lingling, X., Deng, M. (2005) “Dolomite used as raw material to produce MgO-based expansive agent.” Cement and Concrete Research, Vol. 35, No. 8, pp. 1480-1485.
Liu Z., Cui X., Tang M. (1991). “MgO-type delayed expansive cement.” Cement and Concrete Research, Vol. 21, No. 6, pp.
1049-1057.
Mo, L., Deng, M., Tang, M. (2010). “Effects of calcination condition on expansion property of MgO-type expansive agent used in cement-based materials.” Cement and Concrete Research, Vol.
40, No. 3, pp. 437-446.
Mo, L., Panesar, D. K. (2012). “Effects of accelerated carbonation on the microstructure of Portland cement pastes containing reac- tive MgO.” Cement and Concrete Research, Vol. 42, No. 6, pp.
769-777.
Naik, T. R., Singh, S. S., Hossain, M. M. (1994). “Permeability of concrete containing large amount of fly ash.” Cement and concrete research, Vol. 24, No. 5, 1994, pp. 913-922.
Oh, B. H., Jung, S. H., Lee, M. K. (2003). “Influence of porosity on the CO2 diffusion characteristic in concrete.” Journal of the Korea Concrete Institute, Vol. 15, No. 3, pp. 443-453 (in Korean).
Salomao, R., Bittencourt L. R. M., Pandolfelli, V. C. (2007). “A novel approach for magnesia hydration assessment in refractory castables.” Ceramics International, Vol. 33, No. 5, pp. 803-810.
Yoon, E.S., Lee, T. W., Park, S. B. (2005). “Analysis of correlation between compressive strength, void ratio and chloride diffusion coefficient of concrete using various kinds of cement.” Journal of the Korea Concrete Institute, Vol. 17, No. 5, pp. 735-742 (in Korean).
