SO SANH CU'O'NG DO BAM DINH CUA C 6 T GFRP VA C 6 T THEP VOI BE TONG COT SQI PHAN TAN TRONG
Dieu KIEN MOI TRU'ONG DAC TRU'NG CUA VUNG
D 6 N G B A N G S O N G CO'U LONG
THS. NGUYfcN LE THI, TS HOANG BlTC THAO, KS. NGUYEN HAI CHAU
Busadco
Tom tat: Bdi bdo trinh bdy cdc kit qud thuc nghiem so sdnh cuang dp bam dinh cita cot GFRP vd cot Thep vai be tong cot sai phdn tdn trong diiu kien moi tru&ng dgc trung ciia Dong bdng song Cieu Long. Kit qud & 1 ndm tuoi cho thdy: khi sie dung hdm lupng silica fume 5,0% se cho cuang dp bam dinh l&n nhdt a cd hai logi cot dd nghien ciru; vd co sir tirang quan giiea cu&ng dp be long vd cuang dp bam dinh cua mdu doi chirng bdo duong trong phong thi nghiim vd mdu bdo dudng trong dieu kien thiec ti. Ngodi ra, kit qud thuc nghiim con cho thdy dnh huang cua moi truang nu&c man, co tinh phen (pH, dp man, nhiet dp, chu trinh kho - u&t) den cu&ng dp bam dinh cua cot GFRP la it han so v&i cot Thep & trong ciing dieu kiin.
Tix khoa: be long, cu&ng dp bdm dinh, cot GFRP, cot thep, dieu kien moi truang.
Abstract: The paper presents experimental results comparing the bond strength of GFRP and steel bar reinforcement with fiber concrete in the typical environmental conditions of the Mekong Delta. The results at 1 year of age show that: when using silica fume content of 5.0%, it will give the greatest bond strength in both types of reinforcement; and there is a correlation between the concrete strength and the bond strength of the control samples curing in laboratory and the test samples curing on-site conditions. In addition, the experimental results show that the impact of saline, alum-like environment (pH, salinity, temperature, dry-wet cycle) on GFRP bond strength is less than that of steel bar in the same condition.
Keywords: concrete, bond strength, GFRP, bar steel, environmental condition.
L GIO^I T H I E U sau dd la vung ngap nude va vung khi quyin.
Trong mdi trudng an mdn ven bien cd the Phan lon ket cau BTCT bi hu hdng la do cdt chia lam 3 viing: vung ngap nude, vung nude thep bi an mdn [1].
len xudng, viing khi quyin. Be tdng trong cac Viec nghien curu, iing dung cdng nghe BTCT radi trudng nay thudng xay ra cac dang an mon trong xay dung cac cdng trinh trong mdi trudng chinh la an mdn sulfat, an mdn cacbonat hda, an bien, ven bien tai Viet Nam trong nhung nam mdn CO hgc, an mdn vi sinh, an mdn do bi hda qua da co nhieu tien bd. Tuy nhien, d l khac tan hoae nia trdi. Be tdng cdt thep (BTCT) bi an phuc tinh trang an mdn be tdng cdt thep trong mdn manh nhdt la vung muc nude len xudng, radi trudng nude man nay thi cdn phai bd sung
TAP CHfTAl NGUYEN NIJOC SO 1-2020 73
• KHOA HQC CONG NGHE •
cac nghien ciiu, thii nghiem cae loai cdng ngh$
mdi cd the dap ling tdt cac yeu eau neu tren, trong do cd cdng nghe vat Ueu be tdng cdt GFRP (Glass Fiber Reinfored Polymer), la loai v^t lieu tien tien da dugc trien khai rdng rai tren the gidi. Tuy nhien, viec nghien cuu cdt GFRP hien nay edn chua day du nhu: anh hudng eua radi trudng nude man, cd tinh phen, ehu trinh khd - udt den cac tinh chat co ly ciia cdt GFRP va kha nang bam dinh ciia cdt vdi be tdng theo thdi gian.
Cudng do bam dinh ciia edt GFRP va cdt Thep vdi be tdng da dugc eac tac gia nghien Cliu [2][3][4][5][6][7] trong cac dilu kien khac nhau. Bao gdm cac nghien ciiu tren mau be tdng va be tdng cdt sgi [8]. Tuy nhien, chua cd nghien eiiu so sanh eudng do bam dinh tren eung mdt mau thu va trong cung dieu kien an mdn de danh gia khac biet giira hai loai cdt khac nhau.
De tai nghien ciiu so sanh anh hudng cua mdt sd yeu td mdi trudng nude dac trung eua vung ddng bang sdng Cuu Long nhu tinh phen (ndng do pH, axit), chu trinh khd-udt, do man, nhi$t do; va su tuong tae eiia ehiing den iing xii bam dinh dai han cua edt GFRP va cdt Thep vdi be tdng theo thdi gian.
2. V4T LIEU VA PHlTONG PHAP NGHIEN Ctru
Sii dung cAe loai nguyen vat lieu cd san, phd bien tai khu vue phia Nam ndi chung va Ddng bang Sdng Ciiu Long ndi rieng. Trong dd, cd cae vat lieu mdi qua ap dung thyc te da phat huy hieu qua tdt tai BUSADCO nhu cdt sgi PP Porta Ferro, cdt GFRP.
Xi mang sii dung trong nghien cuu (X) la xi mang PCB 40; cdt lieu (eat min la eat sdng - Cs va cat thd - cat ddi - CD); phu gia khoang boat tinh silica fume (SJ, phu gia hda hge sieu deo
thd he 3, gdc caeboncylate phu hgp theo cac tieu chuan TCVN tuong iing. Cdt sgi polypropylene (PP) cua Porta Ferro loai sgi 54 mra phii hgp theo ASTM C1119 [9]/ BS EN 14889-2 [10]/
TCVN 12933 [11]. Cdt GFRP va edt Thep cd dudng kinh danh nghia D=8 mm/ D=10 mm, duge san xudt phu hgp theo TCVN 1U09 [12]
va TCVN 1651-2 [13].
Tinh chat co ly eiia cdt cdt GFRP, cdt Thep va edt sgi phan tan PP cho d Bang 1.
Bang 1. Tinh chat eg ly cua cdt GFRP va cdt Thep
TT
1 2 3 4 5
Tgn chi tieu
Duong kinh danh nghia, mm Duong kinh Ihuc tC mm Gi6i han ben keo, MPa Dp gian dai, % Mo dun dan hoi, GPa
Ketquathunghifim GFRP
8 7,5 960 1,7 58
Thep 10 9,5 599 21,0 195
PP 2,20 2,18 570 16,5 6,5
De tai sti dung phuang phap thuc nghiem ik nghien cuu so sanh anh hirang ciia moi tniang den cuong dp be tong, cuong dp bam dinh cua cot GFRP va cot th^p voi be tong.
Theo so lieu thong ke nghien cijru vh phong chong an mon cho be tong va be tong c6t thep stir dung trong moi tmdng bign thi cin su dung vat lieu ti le N/CKD < 0,45 voi ham lupng xi mang tdi thi6u la 350 kg/m' be tong. Sit dung phii gia khoang hpa tinh silica fume voi ham lupng thay ddi lln lupt la 2,6
%; 5,0 % va 7,4 %. Cd dinh ham lupng phu gia sieu deo 0,8 L/ 100 kg xi mang va ham lupng soi PP 6,0 kg/m' be tong. Be tong c6t spi CO dp sut (4±2) cm. Chi tiet ckp phdi be tong cdt spi cho d Bang 2.
74 TAP CHfTAl NeUYEN M(K SO 1-2020
Bing 2. Thinh ph^n ckp phSi bi tong cot sffi
TT
I 2 3
Cip phoi 2,6%
5,0%
7,4%
T h ^ phdn cho 1 m'betfmp X
kg 350 350 350
CD
510 500 500
Cs kg 340 340 340
D k(.
1050 1040 1040
N I, 145 144 143
S, kg 9.1 17,5 25,9 Miic dp an mon ciia nuoc biln tiiy thudc vao ham lupng cac mudi chiia ion clo (CI) va ion sunphat (804^"), dp pH va nhiet dp cua nuoc bi6n. Ngoai ra, con cd tac ddng do an mon co hpc nhu tac ddng ciaa thuy trieu, song danh hay chu trmh khd - ucjt. Co 4 ySu td chinh la: tinh phen (ndng dp pH), chu trinh khd-udt, dd man va nhiet dp. Dd tai da chpn Binh Bai, Bdn Tre la dia phuong dien hmh c6 phiin dien tich bd bidn tuong ddi Idn, trai dai de nghien cim mdi trudng xam thuc. Kit qua thir nghiem mlu nude biln liy d khu vuc nay tai thdi diim nude xudng (7/2018) va nude len (7/2019) trong ngay khao sat cho d Bang 3.
Bang 3. Tinh chit vi thanh phin hoa ciia nndc biln
TT
1 2 3 4 5 6
TSn chi tieu
DopHd25°C
Do man, g/kg Ham lutmg magie, g/L Ham luong natii, g/L BAm linmg clorua, g/L Ham lupng sunphat, g/L
K^t qua thir nghiem 7/2018
8,5 3,99 0,14 1,16 2,04 0,27
7/2019 6,9 12,2 0,09 0,72 6,37 0,82
Mau be tdng thu nen cd kich thudc (150x150x150) mm. Mau thir cudng dp bam dinh vdi be tdng cd kich thudc (D=100, H -
100) mm, dupe chuin bj bing each boc sap phin cdt GFRP hoac cdt Thep [14][15] dl dam bao chilu sau lam viec, bam dinh trong bd tdng khoang 50 mm. Sii dung be tdng nin la be tdng cdt spi PP. Chi tilt cdng tac chuin bi nhu md ta d Hmh 1 va Hinh 2.
Hinh 1. Chudn bi mdu thir do bdm dinh cho cdt GFRP
Hinh 2. Chudn bi mdu thu do bdm dinh cho cot Thep
Mau thii sau khi dupe due, bao duong 28 ngay trong phong thi nghiem dupe tilp tuc bao dudng trong mdi trudng nude biln ven bd tai Binh Dai, Ben Tre. Cac mau ddi chiing dupe ngam nude trong phdng thi nghiSm trong thdi gian tvr thang 07/2018 din 07/2019.
Hinh 3. Bdo duong cdc mdu thu tai Binh Bai, Bin Tre
Thiet bi sir dung thu nen be tdng ed thang do 3000 kN, vach chia 1 kN, dp chinh xac 1%.
TAP CHI T A I NGUYEN NUOC S(3 1 -2020 75
• KHOA HQC CONG NGHE •
Thiet bi thir do bam dinh cd thang do 100 kN, vach chia 0,1 kN, do chinh xac 1 % va bg ga de thu do bam dinh dirge md ta d Hinh 4.
Hmh 4. Thiit bi thu cuong dp nen vd cuang dp bdm dinh v&i be tong
Chi tieu can danh gia so sanh la cudng do be tdng va cudng do bam dinh giiia be tdng va cdt GFRP hoac edt Thep, khi ngam trong mdi tnrdng thuc te tai hien tnrdng eua bi^n (HT) va mdi tmdng ddi ehumg (DC). Trong dd, cac cap phdi su dung 5% silica fume dugc due lap lai 2 td mau d eimg dieu kien bao duong de so sanh.
Cudng do bam dinh x dugc tinh theo cdng thiic sau [14]:
F T =TtDL
Trong dd: F la luc keo pha hdy, D la dudng kinh lam viec thue te va L la ehieu sau lam viec cua mau.
3. KET QUA THV'C NGHIEM VA B A N L U ^
3.1 Cirdng do be tdng
Mau be tdng trudc va sau khi thu nen cho d Hinh 5. Ket qua thu nen cho d Bang 4 va minh hga d Hinh 6, Hinh 7.
Hinh 5. Mdu bi tong tru&c vd sau khi thie nen Bang 4. Ket qua thir nen mau b£ tong
Ky hieu man 2,6% - HT 2,6%-DC 5,0%-HTl 5,0%-HT2 5,0%-DCI 5,0%-DC2 7,4%-HT 7,4%-DC
Cuong do nen 6 1 nam tuoi MPa Vienl
83,0 93,1 83,1 84,4 82,7 93,5 62,7 73,8
Vien 2 85,3 83,4 87,5 87,2 89,3 83,1 67,1 73,4
Vien 3 84,9 89,3 83,5 91,5 89,0 89,9 68,0 74,3
Trung binh 84,4 88,6 84,7 87,7 87,0 88,9 65,9 73.8
. Poly ( H * n Irirbng) poly (E
H 3 m lirana silica f u m e , %
Hinh 6. Quan h$ giira luang silica fiime vd cu&ng dp nen
C u - o n g (Ifi m i u h i ^ n t n r d m g , M P a
Hinh 7. Quan hi giira cu&ng dp nen hiin truang & doi chung
76 TAP CHI T A I NGUYEN NL/<5C SO 1 2020
Ket qua cho d Bang 4 va minh hga d Hmh 6 cho thay: Cudng do be tdng d mSu cd ham lugng silica fume 5,0% cho kSt qua cao hon so vdi cap phdi cd ham lugng 2,6% va 7,4% d ca mau t h u nghiem hien trudng va mlu ddi chung. Ben canh dd, Hinh 6 va 7 cho t h i y cd tuong quan chat che giua cudng do nen eua m l u hien trudng va m l u ddi chiing d 1 nam tudi vdi xu hudng giam cudng do eua m l u be tdng d tat ca cdp phdi khi bao dudng trong dieu kien hien trudng so vdi m l u ddi chung.
Phuong trinh tuong quan giira cudng do nen eua m l u ddi chiing (RDC) va m l u hien trudng (RHT) nhu sau:
RDC = 0 , 7 3 R H T + 25,92 ( I ) Miic do suy giam cudng do nen tir {1,35 - 10,7)%, thap hon so vdi miic do suy giam d8n 12,8% khi nghien ciiu tren mau be tdng cd cudng do nen trung binh 66 MPa tren mau hinh tru (D=150, H=300) mm, tuong iing vdi cudng do nen xap xi SO MPa tren mau lap phuong (150x150x150) mm khi sir dung nude sinh hoat va nude bien [2].
3.2 Cutmg dd bam dinh giira cot GFRP vdi be tdng
Mau dien hinh sau khi thii do bam dinh gifta cdt GFRP vdi be tdng cho d Hinh 8. Ket qua thii cudng do bam dinh cho d Bang 5 va minh hoa d Hinh 9, Hinh 10.
Bang 5. Ket qua thir bam dinh ciia cot GFRP
Ky hieu mau
2,6%-HT 2,6%-DC 5,0%-HTl 5,0%-HT2 5,0%-DCI 5,0%-DC2 7,4%-HT 7,4%-DC
Cucmg do bamdinhcot GFRP voi be long o 1 nam tuoi, MPa Vien
1 18,13 18,35 18,68 19,87 19,47 18,29 16,87 16,94
Vien 2 15,45 17,56 17,92 17,37 18,61 20,73 17,98 18,53
Vien 3 17,66 17,07 17,55 17,87 19,01 18,16 17,41 19,09
Tning binh 17,08 17,66 18,05 18,37 19,03 19,06 17,42 18,19
A a 4 4 0 . I R
(•)
15,88 16,27 15,91 16,19 16,12 16,30 14,03 14,85 (*) Cong thuc tinh todn cu&ng dp bdm dinh cot GFRP v&i be tong:
T= (0,33+0,025c/db + 8,3dh/lci)^.
Trong do: c-chiiu ddy lap bdo vi; d),: du&ng kinh cot GFRP; Ij-chieu ddi phdn cot tiip xiic vai be tong vdfc- cuang dp nen cua be tong (mdu tru D=I50, H=300).
Poty ( H l j n t n r t n g ) ' — ' Joly (Dii cliihTEl--
Ham [irang silica fume, %
Hinh 9. Quan he giira luang silica fume vd cie&ng dp bdm dinh - Cot GFRP
Hinh 8. Mdu thie dp bdm dinh cot GFRP sau khi thu
Cuimg d^ mau hien truvng, MPa
Hinh 10. Quan hi giua cu&ng dp bdm dinh hiin truang & doi chirng - Cot GFRP
TAP CHI TAI NGUYEN N\J6C S6 1 2020 77
• KHOA HOC CONG NGHf •
Ket qua cho d Bang 5 va minh hga d Hinh 9 eho thay: ket qua cudng do bam dinh trung binh thay ddi tu (17,08 - 19,06) MPa, cd cao hon so ket qua nghien ciiu tren mau GFRP ed eung dudng kinh [5][6][7][8] va tuong tu ket qua tinh toan theo cdng thiic cua ACI 440.IR [16]. Di^u nay cd the giai thich la do de tai sii dung be tdng cd cudng do nen cao hon.
Tuong tu nhu cudng do nen, cudng do bam dinh cua cdt GFRP vdi be tdng d mau cd ham lugng silica flime 5,0% cho ket qua cao hon so vdi cap phdi cd ham lugng 2,6%) va 7,4% d ca mau thir nghiem hien trudng va mau ddi ehiing.
Ben eanh dd, Hinh 9 va 10 cho thiy ed tuong quan chat che giua cudng do bam dinh cua cdt GFRP tren mau hien tnrdng va mlu ddi chiing d 1 nam tudi vdi xu hudng giam cudng do bam dinh d tat ca cap phdi khi bao dudng trong di^u kien hien trudng so vdi mlu doi chung.
Miic do suy giam bien thien tir (3,28 5,15)%. Phuang trinh tuong quan giiia cudng do nen cua mau ddi chiing (xDCGFRP) va mau hien trudng (THTGFRP) nhu sau:
TDCGFRP = 1,05THTGFRP + 0,18 (2)
Cudng do bam dinh giiia cdt Thep vdi be tdng
Mau dien hinh sau khi thu do bam dinh giua cdt Thep vdi be tdng cho d Hinh 11. Ket qua thii eudng do bam dinh eho d Bang 6 va minh hoadHmhl2,Huihl3.
Bang 6. Ket qua thv b^nn dinh cua
Kyhitu mlu
2,6%-HT 2,6%-DC 5,0%-HTl 5,0%-HT2 5,0%-DCI 5,0%-DC2 7,4%-HT 7,4%-DC
Cudng dfibamdinhcotTh^p voi nSm tu6i, MPa Vien
1 15,22 17,95 20,52 21,84 20,88 20,86 15,34 18,08
Vien 2 18,02 19,51 19,17 19,93 21,63 21,96 17,19 17,33
Vien 3 15,79 17,92 19,95 20,03 21,54 22,13 17,44 18,05
Trang binh 16,34 18,46 19,88 20,60 21,35 21,65 16,66 17,82
cot Thip
De tong o 1
AC1440.1R
(**)
17,86 18,30 17,89 18,20 18,13 18,33 15,78 16,70
(**) Cong thuc tinh todn cu&ng dp bdm dinh cot Thep v&i be tong:
T^ (20,23-^)/dl,
Trong do: dt: duang kinh cot Thep; vd f - cu&ng dp nen cUa be tong (mdu try D=150, H=300).
H^m tiTQmg silica fume, %
Hinh 12. Quan hi giiea luang silica fume \ cuang dp bdm dinh - CSt Thep
T _
Hinh 11. Mdu thie dp bdm dinh cot Thep sau khi thu
Cvimg Ab miu hif n bifimg, MPB
Htnh 13. Quan he giiea cu&ng dp bdm dinh hiin tru&ng & doi chimg ~ Cot Thep
78 TAP CHfTAl NGUYEN N U O C S 6 1 2020
Ket qua cho o Bang 6 va minh hpa o Hinh 12 cho thay: kSt qua cucmg do bam dinh trung binh thay ddi tii (16,34 - 21,65) MPa, tuong t u kSt qua tinh toan nghien ciiu tren mau Thep cua ACI CO eimg duong kinh trong diSu kien 25"C [6] [8], va tuong t u kSt qua tinh toan theo cong thiie ciia ACI 440.1R [16].
Tuong t u nhu cucmg dp nen va cucmg dp bam dinh cua cot GFRP voi be tong, cuong dp bam dinh cua cot Thep voi be tong 6 mau co ham lupng silica fiime 5,0% cho ket qua cao hon so voi cap phoi co ham luong 2,6% va 7,4% Of ca m l u thir nghiem hien trucmg va mau ddi chung. Ben canh do, Hmh 12 va 13 cho thay CO tuong quan chat che giiia cucmg d6 nen cua mlu hien truang va m l u ddi chiing o 1 nam tuoi vdi xu huong giam cuong dp bam dhih ciia cot Thep vdi bS tong b tit ca d p phdi khi bao ducmg trong diSu kiSn hi^n trucmg so sanh veil raau ddi chiing.
Phucmg trinh tuong quan giOa cudng dp nen ciia m l u ddi chiing (XDCCT) va m l u hi$n trudng (THTCT) nhu sau:
TBCCT = 0,90XHTCT + 3 , 1 2 (3) Miic dp suy giam nay cd sir bien dpng kha nhiSu d cac d p phdi, biSn thien tir (4,85 11,48)%, Idn hon miie suy giam tuong irng cua cdt GFRP trong cimg dieu kien nghien ciiu.
Bi6u dd cot so sanh sir thay ddi cudng dp bam dinh vdi be tong cua mau GFRP va mau Thep trong diSu kien hien trudng so vcri m l u ddi chiing cho d Hmh 14.
Sir khac biet giira cudng dp bam dmh ciia c6t GFRP va cdt Thep vdi be tdng trong ciing diSu kien nghien eiiu cd t h i la do su khac nhau ve dudng kmh thuc td va hmh dang v i n ciia cac vat lieu nay.
.1 ll ll ll
• CStGFRP aCoITh^p
Hinh 14. So sdnh mice dp suy gidm ciia cu&ng dp bdm dinh
Ngoai ra, dang pha huy lien ket giiia edt Thep va be tdng ciing nhu cdt GFRP vdi be tdng deu tuong t u nhau nhu md ta d Hinh 8 va Hmh 11.
4. K E T L U A N & K I E N N G H I Tu k^t qua thir nghiem d 1 nam tudi tren mau be tdng edt sgi phan tan va mau thir dg bam dinh eua cdt GFRP va cdt Thep vdi be tdng, cd ths nit ra cac ket luan va kien nghi nhu sau:
4.1 Sir dung ham lugng silica flime 5,0%. se eho eudng do nen va cudng do bam dinh vdi be tdng lon nhit d ca hai loai edt (GFRP va Thep) da nghien ciiu;
4.2 Cd su tuong quan kha chat che giiia cudng do be tdng cdt sgi phan tan, cudng do bam dinh cdt GFRP, cdt Thep vdi be tdng cua cae m§u ddi chiing bao duong trong phdng thi nghiem va mau bao duong trong dieu kien thuc te.
4.3 Anh h u d n g cua mdi trudng n u d e man, cd tinh phen (pH, do man, nhiet do, ehu trinh khd - udt) den su suy giam c u d n g do bam dinh vdi be tdng ciia cdt GFRP la it hon so vdi edt Thep d trong ciing dieu kien nghien ciiu.
4.4 Su khac nhau ve dudng kinh thuc te, hinh dang van cua cdt GFRP va cdt Thep anh
TAP CHfTAl NGUYEN NUOCSO 1-2020 79
• K H O A H O C C O N G N G H E •
hudng d6n cudng do bam dinh vdi be tdng ciing cSn duge phan tich, danh gia trong cac nghien cihi tiep theo.
TAI LIEU THAM KHAO
[1] Dang Van Phu. Vien Khoa hgc Cdng nghe Xay dung- Bdo cdo tong quan An mon vd bdo ve cdc cong trinh xdy dung trong moi tru&ng xdm thuc. H a N g i , 7/1999.
[2] Jose Sena-Cruz, Eduardo Pereira, Nelson Freitas, Emanuel Pereira and Sergio Soares. Bond behaviour between GFRP rods and concrete produced with seawater: an experimental research. 9' Intemational Conference on Fibre-Reinforced Polymer (FRP) Composites m Civil Engineering (CICE 2018), PARIS 17-19 JULY 2018.
[3] A. Aryanto & Y. Shinohara. Bond Behavior between Steel and Concrete in Low Level Corrosion of Reinforcing Steel. 15' WCEE. Lisboa2012.
[4] Marco Valente. Bond Strength between Corroded Steel Rebar and Concrete. lACSIT Intemational Journal of Engineering and Technology, Vol. 4, No. 5, October 2012.
[5] Li Sun and Meizhen Zhang.
Experimental research on bond performance between GFRP bar and concrete under single- ended pullout conditions. Advances in Structural Engineering and Mechanics (ASEM 13), Jeju Korea, Sep. 8-13,2013.
[6] Sherif El-Gamal. Bond strength of glass fiber-reinforced polymer bars in concrete after exposure to elevated temperatures. Journal of Reinforced Plastics and Composites 2014, Vol.
33(23) 2151-2163 pp.
[7] Yao Yun, Zou Hao. Experimental study
on bonding property between FRP ^nd concrete. 5* Intemational Conference on Advanced Design and Manufacturing Engineering (ICADME 2015).
[8] J.-Y. Leel, B. Kim, J.-E. Kang, H.-Y.
Choi. Bond Behavior of GFRP Bars Embedded In Fiber Reinforced Concrete. ECCM15 - IS""
European Conference on Composite Materials, Venice, Italy, 24-28 June 2012.
[9] ASTM CI 116/Cl 116M - 10a (Reapproved 2015), Standard Specification for Fiber- Reinforced Concrete
[10] BS EN 14889-2:2006, Fibres for concrete - Part 2: Polymer fibres - Definitions.
specifications and conformity.
[11]TCVN 12393:2018, Be tong cdt spi - Yeu cdu ky thudt vd phuang phdp thie.
[12] TCVN 11109:2015, C6t Composit Polyme
[13]TCVN 1651-2:2008, Thep cdt be t d n g - Phan 2: Thep thanh van.
[14] ACI 440.3R-12, Guide Test Methods for Fiber-Reinforced Polymers (FRPs) for Reinforcing or Strengthening Concrete Structures.
[15] ACI 440.6M-08, Specification for Carbon and Glass Fiber-Reinforced Polymer Bar Materials for Concrete Reinforcement.
[16] ACI 440.1R-06, Guide for the Design and Construction of Structural Concrete Reinforced with FRP Bars.
Nguai phdn biin: GS.TS Lg Manh Hung Phdn bien xong: 12/2019
80 TAP C H f T A l NGUYEN NUCfC SO 1 -2020
