Ảnh hưởng của phụ gia khoáng tro bay nhiệt điện và puzơlan thiên nhiên đến một số tính chất cơ lý của bê tông đầm lăn (RCC)

VAT UEU - M O I TRUONG - KY THUAT HA TANG<br /> <br /> <br /> ANH HUCnSTG CUA PHU GIA KHOAUG TRO BAY NHIET DDSN<br /> VA PUZOLAN THIEN NHIEN DEN M Q T SO TINH C H A T CCf LY<br /> CUA BE TONG DAM LAN (RCC)<br /> <br /> TS. N G U Y I N QUANG PHO<br /> Trudng Dai hoc Thiiy lgi<br /> ThS. NGUYEN T H A N H LE ^<br /> Bp Ndng nghiep va Phat trien ndng thon<br /> <br /> Tom tat: Nghien ciru anh huang ciia phu gia dugc thay the bang phu gia khoang hoat tfnh la tro<br /> khoang tro bay nhiet dien va puzalan thien nhien den bay hoac puzolan thien nhien. Vdi phu gia khoing<br /> cac tinh chat ca ly ciia be tong dam lan cho mgt so dap tro bay da dugc sff dung phd bie'n, san lugng nhieu<br /> da xay dung a nudc ta. Qua dd xac dmh loai phu gia va da ap dung cho mgt sd cong trinh nhu dap Djnh<br /> khoang phii hgp cho dap be tdng dam lan dam bao Binh, Se San 4, Pleikrong,... Tuy nhien, tai mgt sd<br /> tinh kinh te va ky thuat cho cdng trinh. noi xiy dung cong trinh co sin cac md puzolan<br /> thien nhien, viec thay the tro bay bang puzolan thien<br /> 1. Dat van de<br /> nhien lieu co mang lai hieu qua kinh te cao hon va<br /> Cong nghe thi cong be tong dam lan (BTOL) moi dam bao cha't lugng cong trinh hay khong, van de<br /> dugc ip dung tai Viet Nam trong thdi gian gan day nay chiing ta can eo nhffng dinh g i i tren eong trinh<br /> trong eie cong trinh Thuy lgi v i Thiiy dien, song tdc thue te.<br /> do phat triin ra't nhanh. Hien nay, hau he't cac dap be<br /> De tai nghien effu so sanh mgt sd tfnh chat eo ly<br /> tong lOn eua cac cong trinh Thuy lgi, Thiiy dien dang<br /> cua be tong dam lan (RCC) dugc san xua't bdi phu gia<br /> v i se thi eong co sff dung cong nghe thi cong BTOL<br /> khoang tro bay nhiet dien va puzolan thien nhien. Tff<br /> nhff dap Son La, Ban Chat, A Vffdng, Song Tranh,<br /> do de xua't lffa ehgn loai phu gia khoang phii hgp cho<br /> Pleikrong, Dinh Binh, Nffdc Trong..., qua do cho tha'y<br /> cac cong trinh dap BTDL d Viet Nam.<br /> tdc do ffng dung cong nghe BTDL trong thi cong dap 6<br /> nffdc ta l i ra't nhanh va co tfnh phd bien rgng rai cho 2. Vat lieu nghien ciiru<br /> cic vung trong ca nude. . 2.1. Xi mang<br /> Dac dilm ciia BTDL la loai be tong ngheo xi Trong de tai sff dung xi mang PC40 - Hoang Mai co<br /> mang, lugng dung xi mang chi bang khoang 25-30% tai Phong Nghien cffu Vat lieu - Vien Thiiy cong. Ke't<br /> so vdi be tSng thuOng. Lugng xi mang thie'u hut do qua thf nghiem xi mang dffgc thi hien nhff trong bang 1.<br /> <br /> Bang 1. Kef qua thi nghiem xi mang<br /> <br /> Xi mang PC40<br /> Chi tieu thi nghiem Phuong phap thff Dan vi<br /> Hoang Mai<br /> <br /> Khoi lugng rieng TCVN: 4030-2003 g/cm^ 3.07<br /> <br /> DO min (lugng sot tren sang 0,08) TCVN: 4030-2003 0/ 5.97<br /> /o<br /> <br /> Thdi gian bat dau ddng ke't TCVN: 6017-1995 phut 152<br /> Thdi gian ke't thuc dong ket TCVN: 6017-1995 • phut 235<br /> Dd dn dinh thd tich TCVN; 6017-1995 mm 2.53<br /> Gidi han ben nen, tudi 3 ngay TCVN: 6016-1995 N/mm^ 29.6<br /> Gidi han ben nen, tudi 28 ngay TCVN: 6016-1995 N/mm' 51.4<br /> <br /> 2.2. Cot lieu mjn (cat)<br /> Cat lam thf nghiem la cat song Lo, co thanh phan hat tdt; cac chi tieu eo ly nhff trong bang 2.<br /> 40 Tqp cfli KHCN Xdy dung - so 2/2011<br /> VAT UEU - M O I TRUONG - KY THUAT HA TANG<br /> <br /> Bang 2. Cac chi tieu caly cua cat<br /> Ket qua thf nghiem<br /> STT Chi tieu thf nghiem<br /> Ml M2 M3 M*<br /> 1 Khd'i luang rieng, g/cm^ 2.63 2.62 2.63 2.63<br /> 2 Khd'i luang the'tfch xdp, t/m^ 1.41 1.43 1.42 1.42<br /> 3 Do hdng, % 50.2 49.2 49.8 49.73<br /> 4 Luang bun, bui, set, % 0.98 1.03 0.96 0.99<br /> 5 Mo dun do Idn 2.65 2.67 2.63 2.65<br /> 6 Tap chat hffu ca Dat "Dat Dat Dat<br /> <br /> Ghi chu: Chi tieu tap chat hitu ca "dat" cd mau che tao BTDL hgp ly vio khoang 14-18%, nen ddi vgi<br /> dung dich sang han mau chuan thanh phan hat ciia eat nhu tren can phai bd sung<br /> Nhan xet: Cat co cac chi tieu eo ly dat yeu cau khoang 14-18% hat Igt sang 0.14mm. Lugng hat min<br /> diing cho be tong thuy cong theo 14TCN 68-2002 "Cat bd sung vao cat tu nhien c6 t h i l i bgt d i co do min<br /> diing cho be tong thuy cong - Yeu eau ky thuat". Tuy thfch hgp hoae phu gia khoang mjn.<br /> nhiin cit diing ehe tao BTDL co ham lugng hat dudi<br /> 2.3 Cot lieu tho (da)<br /> sing 0.14mm l i ra't ft, nhd hon 1%. Theo cac tai lieu<br /> thidt ke thinh phan BTDL ciia Trung Qudc va mgt sd Da dam duge phan ra 3 cd hat: 5-20mm, 20-<br /> tii lieu thie't kd thanh phan cap phdi BTDL khae d Viet 40mm, 40'-60mm; kit qua thi nghiem eie tinh cha't eo<br /> Nam thi him lugng hat dudi sing 0.14mm trong eat d l ly eiia da dam nhu trong bang 3.<br /> <br /> Bang 3. Cac tinh chat caly ciia da dam<br /> Loai d i<br /> STT Chl tieu thi nghiem<br /> (5-20)mm • (20-40)mm (40-60)mm<br /> 1 Khoi lugng rieng, g/cm' 2.72 2.72 2.72<br /> 2 Khdi luang the tich, g/cm^ 2.69 2.69 2.69<br /> 3 Khoi lugng the tfch xdp, t/ m' 1.36 1.41 1.41<br /> 4 Khdi lugng the tich len chat, t/m^ 1.54 1.60 1.60<br /> 5 Ham lugng bun bui ban, % 0.77 0.45 0.45<br /> 6 Ham lugng thoi det, % 22.00 13.57 13.57<br /> 7 Ham lugng hat mem ye'u, % 0.99 0.76 0.76<br /> 8 Do hut nudc, % 0.43 0.38 0.38<br /> <br /> Sau khi phdi hgp eic ty le da dam 5-20, 20-40, 2.4. Phu gia Irhoang hoat tinh<br /> 40-60 d l dugc da dam hdn hgp 5-40 va 5-60, da Sff dung hai loai phu gia khoing hoat tfnh co tai<br /> dam hdn hgp 5-40mm dugc phdi hgp thanh tU da phong Thf nghiem Vat lieu - Vien Thuy cong: puzolan<br /> dam 5-20 v i 20-40 theo {j le (5-20: 20-40) = (45:55) Gia Quy - Vung Tau eua Cong ty Cd phan Khoang san<br /> ^at y'^^' max = 1,65tan/m^, d i dam hdn hgp 5-60mm Minh Tien v i tro bay Pha Lai eiia Cong ty Cd phan<br /> dugc phdi hgp thanh tff da dam 5-20, 20-40 va 40- Song Da - Cao Cffdng. Kit qua thi nghiim cac chi tiiu<br /> 60 theo t;^ le (5-20: 20-40: 40-60) = (34:21:45) dat CO ly ciia puzolan va tro bay dffgc thi hien trong bang<br /> = 1,73ta'n/m^ 4 va 5.<br /> <br /> Bang 4. Ket qua thi nghiem puzalan Gla Quy<br /> Ket qua thf nghiem<br /> STT Chl tieu thi nghiem Phuang phap thff Dan vj<br /> Ml M2 M3 M*<br /> 1 Ddam 14 TCN 108:1999 % 1.25 1.37 1.12 1.25<br /> 2 Lugng nudc yeu cau 14 TCN 108:1999 % 27 27.5 27.5 27.33<br /> Thdi gian bat dau dong ket 14 TCN 108:1999 ph 115 120 111 115.33<br /> 3<br /> Thdi gian ket thuc dong ket 14 TCN 108:1999 ph 202 217 209 209.33<br /> <br /> <br /> <br /> Tqp cfli KHCN Xdy, dmg - so 2/2011 41<br /> VAT LIEU - MOI TRUONG - KY THUAT HA TANG<br /> <br /> <br /> Ket qua thf nghiim<br /> STT Chl tieu thi nghiem n thi'f Dan vi<br /> Ml M2 M3 M*<br /> <br /> Chl so hoat tinh tudi 7 ngay so vai 82.73<br /> 14 TCN 108:1999 , % 83.5 82.6 82.1<br /> miu do'i chffng<br /> 4<br /> Chl sd hoat tinh tudi 28 ngay so 83.87<br /> 14 TCN 108:1999 % 84.3 83.5 83.8<br /> vdi mau ddi chffng<br /> 5 Khdi lugng the tich xd'p TCVN 4030: 2003 kg/ra.^ 980 1010 995 995.00<br /> 6 Ty tronq TCVN 4030: 2003 g/cm^ 2.81 2.83 2.81 2.82<br /> <br /> 7 Do min (lugng sot tren sang 0,08) TCVN 4030: 2003 % 12.3 13.2 13.5 13.00<br /> <br /> 8 Ham lugng mat khi nung TCVN 7131 2002 % 3.22 3.26 3.28 3.25<br /> 9 Ham luang SiO? TCVN 7131 2002 % 45.68 45.76 45.64 45.69<br /> 10 Ham luang FepOj TCVN 7131 2002 % 17.57 17.65 17.65 17.62<br /> 11 Ham lugng AI2O3 TCVN 7131 2002 % 14.98 14.66 14.34 14.66<br /> 12 Ham lugng SO, TCVN 7131 2002 % 0.48 0.56 0.52 0.52<br /> <br /> Bang 5. Ket qua thi nghiem tro bay Pha Lai<br /> Ke't qua thi nghiem<br /> STT Chl tieu thf nghiem Phuang phap thff Dan vj<br /> Ml M2 M3 M*<br /> 1 Do am 14 TCN 108:1999 % 0.21 0.35 0.38 0.31<br /> 2 Lugng nudc yeu cau 14 TCN 108:1999 % 29 29.5 29.5 29.33<br /> Thai gian bat dau dong ke't 14 TCN 108:1999 ph 180 175 180 178.33<br /> 3<br /> Thai gian ke't thuc dong ke't 14 TCN 108:1999 ph 250 245 250 248.33<br /> Chl sd hoat tinh tudi 7 ngay so<br /> 14 TCN 108:1999 % 78.9 79.6 78.3 78.93<br /> vdi miu doi chffng<br /> 4<br /> Chl sd hoat tfnh tudi 28 ngay so<br /> 14 TCN 108:1999 % 80.2 81.3 79.6 80.37<br /> vdi mau ddi chffng<br /> <br /> 5 Khoi lugng the tich xdp TCVN 4030: 2003 kg/m^ 920 925 915 920<br /> 6 Ty trpng TCVN 4030: 2003 g/cm^ 2.41 2.37 2.39 2.39<br /> 7 Dp min (lugng sot tren sang 0.08) TCVN 4030: 2003 % 6.8 7.1 6.9. 6.93<br /> 8 Ham lugng mat khi nung TCVN 7131:2002 % 4.12 4.16 4.36 4.21<br /> 9 Ham lugng SiOs TCVN 7131: 2002 % 57.4 57.4 57.6 57.45<br /> 10 Ham lugng FejOs TCVN 7131: 2002 % 6.79 6.87 6.95 6.87<br /> 11 Ham lugng AI^G^ TCVN 7131: 2002 % 27.7 26.1 27.1 26.98<br /> 12 Ham lugng SO3 TCVN 7131: 2002 % 0.11 0.1 0.09 0.10<br /> <br /> Nhin xet: Phu gia khoang hoat tfnh puzolan Gia 2.6. Nffdc trpn be tong<br /> Quy v i tro bay Pha Lai co cae chi tieu thi nghiem dat<br /> Nudc sff dung trong trgn b i tOng l i nffdc sinh hoat<br /> tieu chuan dung eho BTDL theo TCXDVN395- 2007 -<br /> da dugc kilm tra dat cd cac chf tieu dat tiiu chuan<br /> "Phu gia khoang cho be tong dam lan".<br /> dung eho be tong.<br /> 2.5. Phu gia hoa hpc<br /> 3. PhUdng phap va ket qua nghien cufu<br /> Trong BTDL phu gia hda hge dugc sff dung dual<br /> dang phu gia giam nffdc va keo dai thdi gian dong ket. De tai nghien cffu dua tren cap phdi BTDL cda mOt<br /> Oe tai niy sff dung hai loai phu gia hoa hgc la: sd cong trinh da thi eOng b nudc ta da dugc dua vd<br /> - Phu gia keo dai thdi gian ninh ket TM 25 cua cung mgt lugng nudc dung cho 2 loaiPGK: bang 6<br /> hang Sika; thdng ke cap phdi BTDL sff dung tro bay, bang 7<br /> - Phu gia giam nudc Plastiment 96 cua hang Sika. thdng ke cap phdi BTDL sff sung puzolan thien nhien.<br /> <br /> <br /> 42 Tqp cfli KHCN Xdy dung - so 2/2011<br /> VAT LIEU - M O I TRUONG - KY THUAT HA TANG<br /> <br /> Bang 6. Thanh phan cap phoi sir dung tro bay<br /> Thanh phan ci'p phdi<br /> TT Tin cdng trinh<br /> XM (kg) Tro bay (kg) Nudc (lit) PGH (Ift) Cit (kg) Da (kg)<br /> <br /> 1 Tin My 115 105 0.9 (TM25)<br /> 115 692 1313<br /> 0.5 (P96)<br /> 2 Nudc Trong 105 125 0.8 (TM25)<br /> 115 750 1354<br /> 0.6 (P96)<br /> 3 BanVe 100 120 0.8 (TM25)<br /> 115 813 1385<br /> 0.6 (P96)<br /> <br /> Bang 7. Thanh phan cap phoi sir dung puzalan<br /> Thinh phan cap phdi<br /> TT Ten cong trinh<br /> XM (kg) Puzolan (kg) Nude (lft) PGH (lft) Cat (kg) Di (kg)<br /> 1 Tin My 80 118 115 1.6(TM25) 687 1402<br /> 2 Nudc Trong 85 115 115 1.6(TM25) 695 1400<br /> 3 BanVe 80 120 115 1.5(TM25) 686 1408<br /> <br /> Tien hinh due mau thf nghiem cffdng do 3.1. Anh hffdng cua tro bay nhiet diin va puzdian<br /> nen, cffdng do keo, do chdng tham nffdc va thien nhien de'n tinh cong tac cua hon hep BTDL<br /> tfnh eong t i e cho c i e mau thi nghiem. So Nghien cffu anh hudng ciia phu gia khoang<br /> sanh ket qua eae ehi tieu eo ly eiia BTDL khi (PGK) hoat tinh den tfnh cong tie eiia be tdng dam<br /> sff dung phu gia khoang la tro bay va Puzolan lan, kit qua thi nghiem Vc trong tffng trffdng hgp<br /> thien nhien. thi nghiem dffgc tdng hgp trong hinh 1 dffdi diy:<br /> <br /> <br /> VcCs)<br /> 14.00 T [<br /> <br /> <br /> 12.00<br /> 10.00<br /> 8.00<br /> 600<br /> 4.00<br /> 2 00<br /> 000<br /> 0 1 2 3 4<br /> —•—Dircnig V c cua B T D L sir chuig P u z o l a n<br /> M BxTong V c Clia B T D L s\r clung Tro bay<br /> Hinh 1. Biiu do so sanh do cong tac ciia BTDL khi sir dung PGK tro bay va puzalan thien nhien<br /> <br /> Nhan xet: Thi nghiem thffe te vdi cac mau dung tro hdn hgp be tong. Puzolan thien nhien, vdi do mjn kem<br /> bay eho kit qua ve trj sd Vc ciia be tong nhd hon so hon va eau tao hat co nhieu goc canh nen kha nang<br /> lap day 16 rdng trong be tong kem hon, tic dung lam<br /> vdi eae mau dung puzolan thien nhien. Kit qua nay eo<br /> chat boi tron eung kem hon so vdi tro bay. Do vay tfnh<br /> thi dffgc ly giai nhff sau: cdng tic ciia be tong sff dung puzolan thien nhien<br /> Do dac dilm eau tao ciia tro bay ed nhieu hat mjn cung kem hon so vdi be tong sff dung tro bay.<br /> hinh eau, ngoii kha nang lap day eie Id rdng giffa cac Tuy nhien, khi dung PGK l i tro bay hay puzolan<br /> hat cdt lieu no cdn co tie dung bdi tron lim tang su thien nhien deu thda man do eong tac Vc yeu eau va<br /> linh dgng eiia eic hat edt lieu; tang tfnh eong tie eua dam bao chat lugng be tong. Thuc te ngudn puzolan<br /> <br /> Tap cfli KHCN Xdy dmg - so 2/2011 43<br /> VAT UEU - MOI TRUONG - KY THUAT HA TANG<br /> <br /> thien nhiin ciia nffdc ta cd trff lugng ldn va chat lugng 3.2. Anh hffdng cua tro bay nhiet dien va puzdian<br /> dam bao yeu cau ky thuat. Vi vay khi mgt sd eong trinh thien nhien de'n cffdng dp chdng l(eo cua BTDL<br /> xiy dung ma ngudn tro bay phai van ehuyin xa thi eo Ke't qua thf nghiem cudng dO khing keo eiia BTDL<br /> t h i tan dung ngudn phu gia khoang puzalan thien mgt sd cong trinh eu t h i sff dung PGK hoat tinh la<br /> nhien tai chd se giam dugc gia thanh xay dung m i van puzalan thien nhien va tro bay nhiet dien dffgc thi hiin<br /> dam bao dugc yeu cau ky thuat ciia cong trinh. tren hinh 2.<br /> <br /> Rk(MPa)<br /> 3.5<br /> <br /> <br /> <br /> <br /> 400<br /> Jlng^y)<br /> - R k B T f l a p T a n My-PGK: Puzalan<br /> Rk BTdap Nuac Trong - PGK: Puzclan<br /> - R k BTdap Ban Ve - PGK: Puaylan<br /> Rk BTdap Tan My-PGK: Tro bay<br /> - Rk BT dap Ncrac Trong - PGK: Tra bay<br /> Rk BT dap Ban Ve - PGK: Tra bay<br /> <br /> <br /> Hinh 2. Bieu do so sanh cudng do khang keo eita BTDL khi si? dung PGK tro bay va puzalan thien nhi<br /> Tff kdt qua tren nhan tha'y: Cffdng do khang keo Cffdng do khang nen ciia BTDL thi nghiem tren<br /> eua BTDL sff dung tro bay nhiet dien cao hon cudng mau lap phffong kich thffde (150x150x150)mm.<br /> do khing keo eua BTDL sff dung puzolan thien nhien<br /> dti't ca cie do tudi 90 ngay, 180 ngiy va 365 ngiy. Ke't qua thf nghiem cffdng dO khang nen cua mOt<br /> 3.3. Anh hffdng cua tro bay nhiet dien va puzcflan sd eong trinh sff dung PGK puzolan thiin nhiin va tro<br /> thien nhien den cffdng dp khang nen cua BTDL bay nhiet dien dffgc thi hien tren hinh 3.<br /> <br /> <br /> <br /> <br /> 200 250 300 350 400<br /> t (ngaY)<br /> -Rn BTdap Tan My-PGK: Puzalan - Rn BT dap Nuac Trong - PGK: Puzolan<br /> - Rn BT dap Ban Ve - PGK: Puzclan - Rn BT d#p Tan My - PGK: Tro bay<br /> - Rn BT dap Nu'ccc Trong - PGK: Tro bay - Rn BT dap Ban Ve - PGK: Tro bay<br /> <br /> Hinh 3. Bieu do so sanh cudng do khang nen ciia BTDL khi sir dung PGK tro bay va puzalan thien nh<br /> <br /> 44 Tqp cfli KHCN Xdy dung - so 2/2011<br /> VAT UEU - M O I TRUdNG - KY THUAT HA TANG<br /> <br /> Nhan xet: Tff kit qua tdng hgp trong bilu do hinh thiet ke tff 30 ^ 60% vdi tren ciing cap phdi thi<br /> 3, so sinh giffa ket qua dung PGK l i tro bay v i nghiem. Khi sff dung puzalan thien nhien, cffdng do<br /> puzolan thien nhien eho thay: ddi vdi be tong dam lan chl tang tff 3 -^ 10% so vdi cffdng do thiet ke yeu eau<br /> sff dung PGK la tro bay thi tde do dat cffdng do khang (Rgo^). Do vay nhffng cdng trinh co ngudn PGK<br /> nen ciia be tong d ngay tudi sdm cung nhff d giai doan puzolan thien nhien gan cong trinh xiy dgng chiing ta<br /> sau va den ngay tudi thilt ke thi tde do phat thin<br /> can nghien cffu dffa vio sff dung d l giam gii thanh<br /> Cffdng do ciia be tong dam lan sff dung tro bay nhanh<br /> xay dffng m i van dam bao cffdng do thiet ke theo yeu<br /> hon v i dat cffdng do cao hon so vdi be tong dam lan<br /> cau dat ra.<br /> sff dung puzdian thien nhien.<br /> Khi sff dung tro bay thi cffdng do d ngay tudi thiet 3.4. Anh hffdng cua tro bay nhiet dien va puzctlan<br /> ke (90 ngay) thudng vugt nhieu so vdi cudng do nen thien nhien de'n tinh chdng tha'm cua BTDL<br /> <br /> Bang 8. Kef qu^ thi nghiem ve do chong tham ciia BTDL d mot so cong thnh<br /> 06 chdng tha'm<br /> STT Tin cdng trinh Khi dung tro bay Khi dung puzolan<br /> Tudi 28 ngay Tudi 90 ngiy Tudi 28 ngay Tudi 90 ngay<br /> 1 Tin My B4 B6 82 B2<br /> 2 Nudc Trong 86 88 82 82<br /> 3 BanVe B4 86 82 82<br /> <br /> Kit qua thi nghiem eho thay: d eung do tudi, kha nhanh, dat gii trj cao han so vdi BTDL sff dung<br /> nang chdng tham cua BTDL sff dung tro bay cao hon puzolan d ngiy tudi dii tffdng dffong;<br /> so vdi BTDL sff dung puzolan thien nhien. Vdi be tong<br /> - Anh hffdng den kha nang chdng tham cOa b i<br /> sff dung tro bay, kha nang chdng tham cDa be tong<br /> tong: cung nhff vdi cffdng do be tong, kha nang chdng<br /> tang theo tudi cua no, edn vdi be tong. sff dung<br /> tham ciia be tong cung dffgc cai thien khi sff dung phu<br /> puzdian kha nang chdng tham eiia no hau nhff khong<br /> gia trong thanh phan hdn hgp be tdng. Vdi hdn hgp be<br /> thay ddi d tudi 90 ngiy. Tuy nhien, d nhffng ngiy tudi<br /> tong sff dung phu gia khoang l i tro bay thi be tong d<br /> dii hon thi thinh phan hoat tinh trong puzolan (SiOz<br /> ngay tudi thilt ke dat mac chdng tham cao hon han so<br /> v i AI2O3) se tie dung triet d l vdi Ca(0H)2 (do C3S<br /> vdi be tong sff dung phu gia khoang la puzolan thien<br /> trong xi mang thuy phin) tao eie chat kit tinh lim<br /> nhien. Ngoai ra do chdng tham eiia be tong sff dung<br /> tang do dac ehae eiia be tong, khi do se lam tang do<br /> tro bay edn eo t h i dat dffgc cao hon d nhffng ngay tudi<br /> chdng tham ciia be tong.<br /> sau do, nhffng vdi be tong sff dung puzolan thien<br /> 4. Ket luan nhien thi kha nang chdng tham hau nhff khdng thay<br /> - Anh hffdng den tfnh cdng tie ciia hdn hgp be ddi. Vi vay, trong nghien effu, thiet ke cae edng trinh<br /> tdng: tro bay va puzalan thien nhien deu cd tie dung sff dung BTDL cd yeu cau chdng tham cao, ngffdi ta<br /> lam tang tfnh edng tac cGa hdn hgp be tong. Tuy thffdng ffu tien sff dung tro bay, con puzalan thien<br /> nhien, tro bay vdi nhieu uu dilm hon ca ve hinh thai nhien thffdng dffgc sff dung trong nhffng trffdng hgp<br /> eau true hat v i thanh phan hoat tinh so vdi puzalan BTDL khdng CO yeu eau chdng tham hoac yeu cau<br /> thien nhien nin do eong tie eua hdn hgp cd ehffa tro khong cao; trong trffdng hgp do thi sff dung eae biin<br /> bay tdt hon do eong tie eiia hdn hgp be tdng ehffa phap chdng tham khae.<br /> puzolan thien nhien; Tdm lai, tro bay nhiet dien hay puzolan thien nhien<br /> - Anh hffdng din cffdng do ciia be tong: BTDL sff deu la nhffng loai phu gia khoang khong thi thilu<br /> dung tro bay thffdng dat cffdng do cao hon so vdi trong thiet ke, thi cong BTDL. Mac du mffc do anh<br /> BTDL sff dung puzolan thien nhien. 6 nhffng ngay tudi hffdng cffa chung tdi tinh chat ciia b i tong cd khae<br /> sdm, BTDL sff dung puzolan thien nhien phat trien nhau nhffng chiing deu cd kha nang cai thien tinh chat<br /> cffdng do eham hon, edn vdi BTDL sff dung tro bay thi ciia BTDL. Trong nhffng trffdng hgp yeu cau thiet ke<br /> Cffdng do be tong sdm phit triin cao hon v i rat khong cao, hoan toin cd the sff dung puzalan thiin<br /> <br /> Tqp cfli KHCN Xdy dmg - so 2/2011 45<br /> VAT UEU - MOI TRUONG - KY THUAT HA TANG<br /> <br /> nhien de thay the tro bay, nhat la cac cOng trinh be 7. L £ MINH. Nghien cffu cic nguon phu gia khoing Viit<br /> tong dam lan d rat xa noi cung cap ngudn tro bay can Nam de lam ehi't d6n min cho BTDL, Bio eio d l t i i cap<br /> thiet eho cong trinh. 86, Vien Khoa hgc Thiiy Igi, Ha Noi, 1998.<br /> 8. NGUY§N TRf TRINH. NhOng nghiin cffu v i b i t6ng<br /> TAI L I £ U THAM KHAO<br /> dam lan ciia HEC 1 - Tuyen tap bio eio "Hoi thao ky<br /> 1. 86 Ndng nghiip v i Phat trien nOng thin (tai liiu djch). thuat sir dung be tong dam lan trong xay dung", Hgi Dap<br /> Nguyin tac thiet ke BTOL v i tdng quan BTOL, Ha Ngi, Idn Viet Nam, Ha Ngi, 12/2005.<br /> 2006.<br /> 9. Viin Nghien cffu B i tOng My. Bio eio B i ting dam lan<br /> 2. C6ng ty Tu van Xiy dung Thu^ Igi (HECI). Bao cao torn ACI-207.5R.99.<br /> tat - c6ng trinh dau mdi hd ehffa Nudc Trong, Ha Noi, 10. H O A N G PHO U Y E N . Bio eio k^t qua thi nghifm BTDL<br /> 2006. cho dap Ojnh Binh tinh Binh Djnh, Ha Ngi, 3/2005.<br /> <br /> 3. Dai hgc Thu^ lgi (tai lieu dich). 86 tdng dam lan dung 11. ACI 207.5R.99. American Concrete Institute Manual of<br /> cho dap, tai lieu dff i n cap qudc gia Bacara ciia Phap Concrete Practice, Part 1-2002, Roller Compacted<br /> 1988-1996,Ha Wo/, 2005. Concrete.<br /> <br /> 4. Dai hoc Thu;^ Igi (tii lieu dich). Nhffng dap Idn d Trung 12. ACI 211.3R. Standard practice for selecting proportion<br /> <br /> Qudc - diem lai ljch sff 50 nam phit trien. Ha Noi, for normal, heavyweight and mass concrete.<br /> <br /> 11/2005. 13. DUNSTAN M.R.H. List of RCC Damp in the virorld up to<br /> 2003; Malcolm Dunstan&Associates; United Kingdom,<br /> 5. LLTONG V A N DAI. Bio eio tinh hinh xiy dung dap<br /> 2003.<br /> BTDL tren th^ gidi v i Viet Nam hien nay (Tuyen tap bio<br /> eio H6i nghj c6ng nghi BTOL trong thi c6ng dap Thiiy 14. ISAO NAGAYAMA, SHIGEHARU JiNKAN. 30 years'<br /> <br /> Igi, Thiiy diin Viit Nam, EVN), Ha Noi, 2007. history of Roller - Compacted Concrete Dam in Japan.<br /> 15. USAGE. Roller Compacted Concrete - Technical<br /> 6. SL 48-94. Quy trinh thi nghiim BTOL thiiy c6ng. Tdng<br /> Engineering and Design Guides, 2004.<br /> cue Thiiy Igi - Thiiy diin. Bo Thuy Igi Thuy dien, Nudc<br /> Cong hoa Nhan dan Tmng Hoa. Ngiy nhin bii: 30/5/2011.<br /> <br /> <br /> <br /> <br /> 46 Tqp cfli KHCN Xdy dung - so'2/2011<br />