1
KHOA HQC - CONG NGHENGHIEN CtfU ifNG Xlf PHA HOAI CUA V0A POLYME VO CCf Cf NHIET D 6 CAO
Tom tat: Bai bao trinh bay ket qua nghien ctfu thtfc nghiem ve stf thay ddi mau sac, khdi Itfong, Ung xd keo khi udn va tfng xd nen d nhiet do cao, den 1000 "C, cua vtfa polyme vo cosCtdung cac vat lieu sin cd d Viet Nam. Kit qua thi nghiem dUOc so sanh vdi cac miu vtfa sd dung xi mang podclang PCB30 truyen thdng. Nghien ctfu cho thay tfng xd cudng do cua vtfa polyme vo co tang manh khi nung den nhiet do khoang 300 °C, sau dd giam din khi nhiet do tiep tuc tang den 1000 °C. Ddng thdi, d tat ca cac nhiet do thi nghiem, cUdng do cua vtfa polyme vd co deu cao hon so vdl vtfa xi mang. Dieu nay chtfng td vtfa polyme vd cO la vat lieu chiu dUOc nhiet do rit cao va md ra hudng nghien ctfu de ap dgng vat lieu nay trong nhdng ciu kien cdng trinh cd xet den do an toan khi hoa hoan, nhit la ciu kien vo cdng trinh ham.
Abstract: This paper presents experimental re- sults in colour change, weight reduction, flexural and compressive behaviours in elevated temperatures, up to 1000 "C, of geopolymer mortar prepared using available materials in Vietnam. The experimental re- sults were compared to those of cementituos mortar samples used traditional PCB30 Portland cement.
The investigation shown that strengths of geopoly- mer mortar incresase dramatically when temperature raises up to 300 "C. After that, the strengths gradually reduce when temperature goes up to 1000 "C. Inter- estingly, the strengths of geopolymer mortar sam- ples are significant higher than those of the cementitous mortar samples. Experimental goals prove geopolymer mortar is a fire resistant material.
This is opening a trend to use this material in struc- tural construction applications that consider to fire resistance, especially for tunnel lining.
Keywords: Polyme vd CO; iJng xd nhiet; Vat lieu chdng chay; Vat lieu "Xanh".
1. Gidi thieu
Vat lieu polyme vd cP da va dang dope quan tam nghien cOu trong hPn hai thap ky qua do nd ed trien vpng tdt thay the cho e i e s i n pham sO dung xi mang podclang truyen thdng. C i c nghien cOu trdn the gidi [1-4] va d Viet Nam [5-7] da khang djnh dope cac Ou diem ndi bat cua vat lieu nay ve c i c tinh eha't eP hpc va dp ben cung nhO kha nang tan dung c h i t t h i i nham g i i m thieu d nhidm mdi trodng.
C i c nghien cOu ve k h i nang chju nhiet dd eao eua c h i t ket dinh polyme vd eO (GP) v i betdng polyme vd CO (betdng GP) da dope thoc hien [1-3, 8, 9]. C h i t ket dinh GP da dOOe chOng minh l i ed k h i nang chiu dope nhiet dp eao Idn den 1200 °C v i d i p Ong tieu ehuan eua mdt vgt lieu chdng c h i y [1-3]. Tuy nhien,
TS. DAO VAN DONG
Trtfdng D^i hgc Giao thong van tai
betdng GP van bj p h i huy d nhiet dp den 1000°C.
Nguyen nhan cua sy p h i huy nay ehu yeu la do Ong xO bien dgng vi nhiet giOa pha hd GP v i pha cdt lieu Idn ed so k h i e biet r i t Idn. Dieu nay d i n den sy p h i hogi vung dinh b i m giOa Idp hd GP vdi be mat cdt lieu Idn, d i n den p h i huy betdng GP [8, 9]. Nghien cOu ve k h i nang chju nhiet dp eao cua vOa sO dyng eha't ket dinh GP van choa dope thyc hien. Vi vay, viec nghien cOu d i n h g i i k h i nang chju nhiet dp cao cua vOa GP (hdn hpp cdt lieu nhd ( c i t ) v i eha't ket dinh GP) l i can thiet.
Mdt trong nhOng tieu ehuan thiet ke an t o i n eho e i c edng trinh x i y dyng, nho n h i eao t i n g v i h i m , la yeu eau chdng chju dope nhiet dp cao trong trOdng hpp ed hda hoan x i y ra [10]. Trong trOdng hpp nhO the vat lieu ed the p h i i chju nhiet ldn tdi tren 1000 °C.
6 nhiet dp cao dd, vat lieu be tdng xi mang truyen thdng mat k h i nang chju lye v i p h i huy hoan t o i n . Dieu n i y l i m ket eau cdng trinh syp dd, gay t i c nghen dydng t h o i t hiem eua eon ngodi (Hinh 1). Vi nguyen nhan dd m i nguy eo thiet hgi ve tinh mang eon ngodi la cao n h i t . De hgn che hoac l i m cham q u i trinh syp dd eua ket eau edng trinh, vat lieu c i n chju dope nhiet dd cao. Ndi c i c h k h i e , c h i t lopng vat lieu d nhiet dp cao khdng bj suy giam nhieu d i n den m i t k h i nang chju loc cua ket cau trong k h o i n g thdi gian du dai, du de eon ngodi ed the thoat khdi vung nguy hiem [11].
Hinh 1. Pha hoai ldp vo ham do hoa hoan d dudng him Holland, New York, My, 1949 (ngudn google).
Theo Eurocode 2 va 3 [12, 13] nguyen nhan chu yeu lam p h i huy ket c i u be tdng va be tdng cdt thep khi chiu nhiet dd cao hay hda hogn l i do sO suy giim nhanh chdng cOdng dp chiu lOc cua vat lieu, trong do ehij yeu la vat lieu be tdng. Ldp be tdng va be tdng cdt thdp bi p h i hogi chu yeu do c i e nguyen nhan, gdm:
a) Hoi am trong be tdng t h o i t ra q u i nhanh (di kem
KHOA HQC - CONG NGHE Tap Chi GTVT 3/2011
bong trdc Idp be tdng vd); b) X u i t hien c i c vet nOt do co ngdt; c) So thay ddi trgng thai ket tinh cua d i xi mang, v i n h i t la eua c i c logi cdt lieu trong be tdng;
d) Bien dang vi nhiet k h i e nhau eua cae pha trong be tdng v i cua cdt thep d i n tdi p h i t sinh vet nOt nhiet...
Viet Nam dang trong giai doan p h i t trien nhanh cac do an nha eao t i n g va dang d giai dogn d i u trien khai e i e do i n edng trinh h i m giao thdng, Vi vay, vide nghien cOu c i e vat lieu xay dong mdi cd k h i nang chju dope nhiet dp cao n h i m tOng bode Ong dung cho ket c i u edng trinh, n h i t l i cdng trinh h i m la c i n thiet.
Tuy nhien, cho den nay Viet Nam chOa ed tieu chuan chdng chay cho vat lieu va ket eau cdng trinh giao thdng. Ddng thdi, ket c i u vd h i m da va dang dope ap dung van dOa tren nen cua vat lieu sO dung xi mang pdoclang truyen thdng (XMP).
B i i b i o trinh b i y ket q u i nghien cOu thOc nghiem vOa GP khi chju nhiet dd den 1000°C de x i c djnh so thay ddi ve mau s i c , khdi lopng, Ong xO ve codng dp keo khi udn v i cOdng dd nen. Ket qua thu dope dope so s i n h ddi chOng vdi c i c m i u thO vOa XMP. TO dd de x u i t k h i nang ap dyng cua vat lieu cd sO dung chit ket dinh GP trong c i c ket eau ed xet den yeu c i u chju hda hogn, n h i t la ket c i u vd cdng trinh ham giao thdng, gdp p h i n thay the d i n vide sO dung XMP.
2. Chuan bj m i u thCf
2.1. Vat lieu va ty le thanh phan
Ket q u i eua nghien cOu nay n i m trong chudi nghien cOu ve c i c tinh c h i t ky thuat cua c h i t ket dinh polyme vd cO v i vat lieu polyme vd eP [5, 7]. Tuy nhien, de da dgng hda c i c ngudn vat lieu t h i i s i n ed d Viet Nam, nghien cOu n i y sO dung tro bay nhiet dien da qua sP tuyen bang cdng nghe thdi gid phan ly tO ngudn tro nhiet dien cua nha may nhiet dien P h i Lai, tinh H i i DOOng. Thanh p h i n v i dp min cua tro bay dope the hien d Bang 1 va B i n g 2. Day la loai tro g i n tOPng dOOng vdi tro bay nhdm F [14]. C i e vat lieu khac gdm XMP, dung dich xut (NaOH) va thuy tinh long gde Kali (K2Si03) dope sO dung tOPng tp nho cac nghien cOu da dope edng bd [5, 7].
Bang 1. Thanh phin hoa hgc cua tro bay sddgng trong nghien ctfu (% theo khdi lugng)
Si02 51.74
tro
AI2O3 24.53
FesOs 5.59
C a O 0.81
M g O 1.95
K2O 4.42
N a 2 0 0.11
T i O j 0.76
SQa 0.31
M K N * 8.98
*) Lopng m i t khi nung
Bang 2. Thanh phin hat cua tro bay sd dgng ng nghien ctfu
Cd hgt (nm) Lupng Ipt sang (%)
30 95
20 51.67
10 33.06
5 16.77 Loai tro bay cd ed hat trung binh 9.6 pm va ty Id dien tich be mat dat 8169 cm^/cml Cdt lieu sO dung cho c i e td m i u GP l i eat ty nhien cd md dun hat M|^
= 2.6, va cho c i c td m i u XMP la eat tieu c h u i n [15], Node sO dyng la node sinh hogt. Vat lieu va ty le thanh p h i n de che tgo c i c m i u thO dope the hien chi tiet trong B i n g 3.
Bang 3. Vat lifu, ty Ig thanh phin va dieu kign dudng hg cdc mau thi nghigm
n
1 2
Tjmiu
PCB30 QP
V»t llttJ vH tv 't «'*"'' ph*" ("iM ''''4' l''?"9) Cdi
t "
1 XM Cat 0.33
N PKA XM : Cat
0.5 0.33
N a O H ' PFA 0.157
K.SiO, PFA 0.393
Bl(u klfn dUtng h^
Ngam ni/dc PTN'"
60°Cffi< old t PTN 1
*) dung dieh NaOH 14M; **) e i t tieu chuan; ***) dieu kien phdng thi nghiem (t = 25+3°C: dd am = 70±15%).
2.2. Nhao trpn hdn hdp va che tao m i u thiT Hdn hpp dope nhao trdn b i n g m i y trdn vOa Holbat Mixer. Quy trinh trdn tuan thu theo hodng d i n da dope cdng bd trOde day [7]. Hdn hpp sau khi nhao trdn dope dOe e i c m i u hinh d i m kich thude 40x40x160 mm.
Quy trinh che tao m i u tuan thu theo hodng d i n da dope cdng bd trode day [7].
2.3. DUdng hp m i u
C i c td m i u ddi chOng sO dung XMP PCB30 dope dodng hd theo TCVN 6016-95 [16]. C i c td m i u sO dung chat ket dinh GP dope due khudn, sau 24 gid tien hanh dodng hd trong tu s i y d nhiet dd 60°C trong 24 gid. Sau dd ehung dope thao khudn va lOu d dieu kien phdng thi nghiem cho den ngay thi nghiem [7].
3. Ket qua t h i nghiem va t h i o luan
Cae m i u thO, mdi td m i u gdm 6 m i u vOa GP v i 3 m i u vOa XMP ddi chOng, sau khi dope dodng hp nhu Muc 2.3 dope lOu giO d dieu kien phdng eho den khi dn djnh ve khdi lopng. Ld nung sO dung trong nghien cOu nay la loai VMK 1600 cd nhiet dp nung tdi da 1600 °C do DOc s i n xua't,
Cac m i u thO sau dd dope tien hanh nung d cae mOe nhiet dp khae nhau, gdm d 200, 400, 600, 800 va 1000 °C, Che dp nung dam bao tdc dp tang nhiet 5 °C/phut. Khi nhiet dp Id dat den nhiet dp nung mong mudn, tiep tuc duy tri nhiet dp them 2 gid, sau dd n g i t dien va de' tiep 24 gid de dam bao m i u thO nguoi ve nhiet dp phong. Cac m i u thO sau dd dope tien hanh thi nghiem de danh gia mpt sd chi tieu ky thuat chu yeu va dope so sanh vdi td mau ddi chOng khong nung. PhUPng phap thi nghiem nay mo phdng quy trinh thi nghiem quy dinh theo ASTM E l 19 [17] va ISO 834 [18] nhung cd Ou diem la tang mOc dp b i t Ipi cua m i u thO do toan bd m i u dupc dat trong moi trodng nhiet dp eao va thdi gian duy tri mau thO d moi trudng nhiet dp cao dai.
3.1. SU thay ddi mau s i c
Cac m i u thO sau khi dope nung d eae che dp nhiet den 1000°C dope quan sat b i n g m i t thodng be mat ngoai va mat e i t ngang de danh g i i trang thai vet nOt va so thay ddi mau s i c .
Ve trang thai vet nOt tren be mat cac m i u thO sau khi nung cho t h i y cac m i u vOa XMP cd mat dp vet nOt nhieu hPn va be rdng vet nOt Idn hPn so vdi c i c m i u vOa GP. Nguyen nhan cd the la do lOpng nude cd trong cac m i u XMP nhieu hPn so vdi cac m i u GP ( B i n g 3) nen qua trinh nung l i m thoat hoi node ra ngoai thdng qua viec hinh thanh cac vet nOt nhu da phan tich.
Xet ve mau s i c , cac m i u XMP ddi chOng cho mau s i c kha ddng deu tren toan bd mat c i t ngang m i u . Dieu nay chOng td vdi che dp nung da thiet ke nhiet dope truyen deu vao trong long mau. NgOpc lai, v6i nhung m i u GP, mau s i c mau thay ddi ro ret theo chieu sau m i u , Idp vd ngoai mau ggch nung, Idp Idi mau s i m (Hinh 2). Ket qua nay cd the la do he sd truyen nhiet cua vOa GP thap nen vdi che dd nung da sO dung thi nhiet dp cao chua truyen dope ddng deu vao loi mau. Vi vay, Idp vd chuyen thanh vat lieu gdm do t i c dyng true tiep cua nhiet dd cao cdn Idp loi v i n
KHOA HQC - CONG NGHE
tdn tgi d dgng polyme vd eP. He sd truyen nhiet thap eua vOa GP se cd t i c dung b i o ve mat sau cua e i e ket cau chju nhiet khi cd ngpn lOa hogc nhiet dp cao t i c dung v i o mat tryde cua nd.
Hinh 2. Mau sdc theo mat cat ngang miu sau khi nung d 1000°C, a) miu XMP, b) miu GP
3.2. SU thay doi khoi lUdng
C i c m i u thO dope can trOde v i sau khi nung, dp chinh x i e den ± 0.1 g. Ket q u i thi nghiem dope the hien trong Hinh 3.
Theo Hinh 3, e i e m i u thO, c i m i u vOa GP va m i u vOa XMP, deu g i i m khdi lOpng khi nung. MOe g i i m khdi lopng tang d i n theo mOc dp tang nhiet dp nung.
Khi nhiet dd nung tang tO nhiet dp phdng den e i e mOc 200, 400 v i 600°C, khdi lOpng c i c m i u thO GP g i i m deu dan tO 1.4%, 3.04% v i 4 . 2 1 % .
0 200 400 600 800 1000 1200 0
? 7 .
^ 1 'S ,
E -6
•? 7
a -»
^ \ ^ ' '
\ ^^>^^
.
'
- ••- -XMP
• ^ ^ ^ ' • > « . . ^
* » ^V^ 9 m
" • .
Nhiel do (deg C )
Hinh 3. Dg giam khdi lugng do nung d nhlgt dg cao 6 c i e nhiet dp 800 va 1000°C, mOc g i i m khdi lopng dn djnh d khoing 4,24% so vdi m i u ddi chOng d 25°C, Xu hodng giam khdi lopng eua c i e m i u XMP g i n tOPng to nho cac m i u GP, nhOng mOe g i i m khdi lOpng Idn hPn nhieu, 6 e i c nhiet dp nung 200, 400, 600 v i 800°C, khdi lopng c i c m i u thO XMP g i i m deu dan tO 3,66%, 5.46%, 6.91% va 8.04%. Sau 800°C mOc g i i m khdi lopng cua c i c m i u XMP mdi dn djnh d mOc 8.04%.
TO e i e ket q u i thi nghiem ed the do d o i n rang khi nhiet dp nung tang thi l i n lopt node to do, node h i p phy v i nydc lien ket hda hpc cd trong c i c m i u vOa bi bay hoi, Tuy nhien, do lOpng node ed trong e i e m i u vOa GP ft hon so vdi e i c m i u vOa XMP nen mOc giam khdi lopng eua c i c m i u vOa GP thap hPn so vdi c i c m i u vOa XMP. Qua day cho phep dy d o i n l i mOc dd CO the tich eua cac m i u GP d nhiet dp eao thap hon nhieu so vdi c i c m i u vOa XMP, Dieu nay cd the se giam thieu mOc dd p h i hogi d nhiet dp eao eua e i c ket eau cd sO dyng GP so vdi e i e ket eau truyen thdng sOdung XMP,
3.3. Thi nghiem keo khi udn
Thf nghiem keo khi udn e i e m i u thO dope tien h i n h theo TCVN 6016-95 [16] sO dyng bd g i i udn 3 diem dope g i l i p tren thiet bj thi nghiem ve d i t C B . R [7], Ket q u i thi nghiem cOdng dp chju keo khi udn cua c i e m i u thO sau khi nung d e i e nhiet dp 200, 400, 600, 800 va 1000°C thu dope dope xO ly thdng ke [19], Cac g i i trj cOdng dp chju keo khi udn trung binh ( R k u ) . dp
lech tieu chuan (a), va he sd phan t i n (C^) dope the hien trong B i n g 4,
Ket q u i thf nghiem theo B i n g 4 cho tha'y c i c td m i u vOa GP deu cho he sd bien sai C^ nhd hon 16,5%. Dieu n i y chOng td dp phan t i n eija ket qua thf nghiem nhd v i ket q u i thi nghiem dgt dp tin eay phO hpp [20]. Hinh 4 the hien sy thay ddi cOdng dp keo khi udn eua e i c td mau thi nghiem sau khi nung d e i e nhiet dp k h i c nhau.
Bang 4. (fng xd k6o khi udn
Nhiet dp
°C 25 200 400 600 800 1000
GP
K
MPa 10.74 17.00 12.15 3.95 3.02 3.01
CT
MPa 1.19 0.71 0.48 0.21 0.16
C.
%
6.98 5.88 12.10
6.88 5.17
PCB30
^t
MPa 6.64 7.94 7.00 1.66 0.69 0.31
5; 14 3
•= 10
.
• « •
- O f -XMP
• ' ' " • \
---•.. • - »
Nhigcdpldiiri
Hinh 4. Ket qua thinghigm cudng dg chiu keo khi udn So vdi e i e td m i u khdng nung, e i c td mau sau khi nung d 200 v i 400°C deu tang kha nang chju keo khi udn. Tuy nhien, mOc dp tang cua c i e m i u GP Idn hon nhieu so vdi cua c i c m i u XMP. Trong khi c i c m i u GP tang g i n 60% cOdng dp, den 17 MPa, d 200°C, thi c i c mau XMP chitang dope 15%, den 7.94 MPa. Dieu n i y eho phdp dy d o i n rang, d k h o i n g nhiet dp 400°C tiep tyc thue day q u i trinh polyme hda c i c hpp chit vd cP de tang k h i nang chiu keo. TO 600°C trd len, cO- dng dp chju keo khi udn eua c i c td m i u deu g i i m . NhOng trong khi e i e m i u XMP g i i m ehi edn khoing 0.3 MPa d 1000°C thi c i c m i u GP v i n cdn dgt dope cOdng dd keo khi udn d mOc Idn hon 3 MPa, Idn hPn gap 10 l i n so vdi c i c m i u XMP. Ndi c i c h k h i e , vat lieu cd sO dyng XMP g i n nhO p h i hogi d k h o i n g nhiet dp 1000°C, trong khi vgt lieu sO dung eha't ket dinh GP v i n duy tri dope g i n 30% k h i nang chiu keo khi udn. Nho vay, cOdng dp keo khi udn eua vat lieu vOa GP eao hPn codng dp keo khi udn cua vOa XMP PCB30 trong d i i nhiet dp cao den 1000°C, tO g i n 2 lan d nhiet dd phdng thi nghiem [7] den 10 l i n 6 1000°C. Ket qua n i y cho phdp dy d o i n kha nang chju nhiet tdt hPn han cua vOa GP d nhiet dp cao.
3.4. Thf nghiem nen
Thi nghiem nen e i e m i u thO dypc tien h i n h tren m i y nen theo TCVN 6016-95 [16]. Ket qua thi nghiem cOdng dp ehiu nen eua e i e m i u thO sau khi nung d e i c nhiet dp 200, 400, 600, 800 v i 1000°C thu dope dope tien h i n h xO ly thdng ke [19] v i dope the hien trong B i n g 5 v i Hinh 5,
O nhiet dd phdng codng dp chju ndn cua e i c mau thO GP dgt g i n 42 MPa, Idn hon cOdng dp nen cua vOa XMP, Ket q u i nay phO hpp vdi nhOng nghien cOu da dope cdng bd trode d i y ve vat lieu polyme vd ed [5, 7], Trong k h o i n g nhiet dp den 600°C, cOdng dd ndn eua vOa XMP g i i m deu dan xudng khoang 38, 35 va 29 MPa, toOng Ong g i i m 7, 14 va 18% so vdi cOdng dp ndn d 25°C, NgOpe Igi, vOa GP Igi tang cOdng dp ndn khi nhiet dp tang trong d i i nhiet den 600°C, tOdng Ong tang them 70, 63 v i 13% so vdi cOdng dp nen d dieu kien phdng, Nho v i y , nhiet dp tang trong khoing nay cd the cd t i e dyng thuc day q u i trinh polyme hda e i c hpp c h i t polyme vd eP trong vOa GP,
KHOA H Q C - C O N G NGHE Tap Chf GTVT 3/2011
Bang 5. Lfng xd nen
Nhl$t
"C 25 200 400 600 800 1000
GP
K
MPa 41.98 71.01 68.53 47.42 31.77 26.36
CT
MPa 9.51 5.75 5,22 3.96 4.10
c.
%
13.39 8.39 11.01 12.47 15.54
PCB30i R*
MPa 40.71 38.05 35.21 29.35 12.79 5.91
Hinh 5. Ket qua thi nghiem cudng do chiu nen Khi nhiet dd tiep tue tang den 1000°C, cudng dp nen eua cac m i u thO XMP giam nhanh, xudng dodi 6 MPa, tOPng Ong ehi cdn k h o i n g 14% so vdi cOdng dd nen d 25'^C. Trong khi dd, ddi vdi eae m i u GP, eodng dp nen ed g i i m nhong v i n duy tri dope tdi tren 26 MPa, tOPng Ong vdi g i n 63% codng dp nen ban d i u , Ket qua nay ehi ra rang khi nhiet dp len den lOOO^C thi kha nang chju nen cua vOa XMP edn lai khong dang ke nhong vOa GP v i n duy tri tdt kha nang chju nen so vdi dieu kien thodng, Ndi c i c h khac, vat lieu vOa GP hoan toan duy tri dope kha nang chju nen den nhiet dp lOOO^C,
MOc giam cOdng dp nen nhieu d cae mau XMP phu hpp vdi mOc g i i m khdi lopng da dope phan tich d Myc 3,2, Khi e i e thanh p h i n node trong da xi mang bj m i t di thi c i u trOc cua da xi mang bi p h i hoai, d i n tdi k h i nang chju lOe eua vat lieu sO dung XMP bi suy giam mgnh, NgOpc Igi, do c i u trOc polyme khong gian 3 chieu trong GP ben vOng nen kha nang p h i huy mach eau true khd hon, vi vay kha nang duy tri cOdng dp cua GP d nhiet dp eao tdt hPn nhieu so vdi XMP,
4. Ket luan va kien nghj
TO c i c ket qua thOe nghiem dat dope trong nghien cOu n i y , c i e ket luan va kien nghi sau cd the dope rut ra:
* Khi nung den 1000°C, trong khi cae m i u vOa xi mang pdoclang g i n nho p h i hoai hoan toan thi cac m i u vOa polyme vd eP lai chuyen thanh vat lieu dang gdm va v i n duy tri dope kha nang lam viec.
* MOc dd giam khdi lopng khi nung den nhiet dp 1000°C ctja cac m i u vOa polyme vd cP ehi b i n g khoang 50% so vdi c i c m i u vOa xi mang pdoclang.
* Codng dp chju keo khi udn cua vOa polyme vd cP tang khi nhiet dp nung dat den 400"C, 6 1000°C cOdng dd chju keo khi udn eua vOa polyme vd cP Idn hPn g i p 10 l i n so vdi eodng dd tOPng Ong cua vOa xi mang pdoclang ddi chOng,
* Codng dd nen eua vOa polyme vo cP tang g i n gap 2 l i n sau khi nung den nhiet dp 400°C. Khi nhiet dp nung tang den 10OO^C, eodng dp nen cua cac m i u polyme vo cP v i n dgt dope khoang 63% cOdng dp ban dau, trong khi dd c i e m i u vOa xi mang pdoclang ddi chOng chi duy tri dope khoang 14% gia tri ban d i u ,
* VOa polyme vd cO cd the dupe sO dung trong nhOng Ong dung xay dong dap Ong yeu c i u chiu nhiet dp cao v i chdng c h i y , n h i t la Ong dung lam Idp vd h i m ,
* Cac nghien cOu tiep theo ddi vdi vOa polyme vo co d c i e nhiet dd tren 1000°C nhinn danh gia kha nang chdng chay theo cac tieu chuan qude te hien hanh la e i n thiet. Ddng thdi, thi nghiem md hinh cac
ket cau xay dong ed yeu cau ehiu nhiet dd cao va chdng chay sO dung vOa polyme vd eP nen sdm dope quan t i m d Viet Nam •
Tai lieu tham khao
[1], Joseph Dsvidovits (2002). 30 years of suc- cesses and failures in geopolymer application.
[2], Adward G, Nawy (2008), Construction Engi- neering Handbook, 2"^ edition, CRC Press.
[3], Joseph Davidovits (2008), Geopolymer chem- istry and applications.
[4], Joseph Davidovits (2002), Environmentally driven geopolymer cement applications.
[5], Dao Van Ddng (2009), VOa va be tong "xanh"
sd dung chat ket dinh polyme vd co, Tap ehi Khoa hoe GTVT.
[6], Dao Van Dong (2009). Vat lieu "xanh" va ben vdng - xu hudng de phat then xay dUng, Tap chi Khoa hpc cdng nghe Xay dpng.
[7], Dao Van Ddng (2010), Nghien cdu dng xd nen va keo khi udn cua vda polymer vd eO, Tap chf Giao thdng Van tai, trang 28-34.
[8], Daniel L.Y, Kong, Jay G. Sanjayan (2008), Damage behavior of geopolymer composites exposed to elevated temperatures, Cement & Concrete Com- posites, Vol 30, pp, 986-991.
[9], Cheng T.W., Chiu J.P. (2003). Fire-resistant geopolymer produced by granulated blast furnace slag.
Minerals Engineering, Vol 16, pp, 205-210,
[10], The British Tunnelling Society and the Institu- tions of Civil Engineers (2004), Tunnel lining design guide, Thomas and Telford.
[11]. Theodor Kranthammer (2008). Modern Pro- tective Structures, CFC Press.
[12]. EN 1992-1-2 (2004). Eurocode 2, Design of concrete structures, Part 1-2: General rules - Structural fire design, Commission of the European Communi- ties, Brussels.
[13]. EN 1993-1-2 (2005). Eurocode 3, Design of steel structures. Part 1-2: General rules-Structural fire design, Commission of the European Communities, Brussels.
[14]. ASTM C618 (2003), Standard Specification for Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use in Concrete. American Society for Testing and Ma- terials,
[15], TCVN 6227 (1996). Cat tieu ehuan ISO de xae dinh eUdng do cija xi mang. Tuyen tap tieu c h u i n xay dOng Viet Nam,
[16], TCVN 6016 (1995). X/ mang - phUOng phap thu - xac dinh do ben. Tuye'n tap tieu chuan xay dOng Viet Nam.
[17]. ASTM E l 19 (2000). Standard Test Methods for Fire Tests of Building Construction and Materials.
American Society for Testing and Materials.
[18]. ISO 834 (1985). Fire Resistance Tests - Ele- ments of Building Construction, International Organisa- tion for Standardisation.
[19], ACI 214R (2002). Evaluation of Strength Test Results of Concrete. American Concrete Institute.
[20]. TCVN 356 (2005). Ket cau be tdng va be tdng cdt thep - Tieu chuan thiet ke. Tuyen tap tieu chuan xay dong Viet Nam.
