tcxdvn 395-2007 phụ gia khoáng cho bê tông Đầm lăn

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WWW.VNCOLD.VN Trang WEB Hi p ln Vit Nam

1

B xy dng cng ho x hi ch ngha vit nam c lp T do Hnh phc S 23 /2007/Q- BXD H Ni, ngy 04 thng 6 nm 2007

quyt nh V vic ban hnh TCXDVN 395 : 2007 "Ph gia khong cho b tng m ln "

B trng b xy dng Cn c Ngh nh s 36/2003/N-CP ngy 4/4/2003 ca Chnh ph quy nh chc nng, nhim v, quyn hn v c cu t chc B Xy dng;

Xt ngh ca V trng V Khoa hc Cng ngh,

quyt nh

iu 1. Ban hnh km theo quyt nh ny 01 Tiu chun xy dng Vit nam:

TCXDVN 395 : 2007 Ph gia khong cho b tng m ln

iu 2. Quyt nh ny c hiu lc sau 15 ngy, k t ngy ng Cng bo Chnh ph.

iu 3. Cc ng Chnh Vn phng B, V trng V Khoa hc Cng ngh v Th trng cc n v c lin quan chu trch nhim thi hnh Quyt nh ny./. KT. B trng Ni nhn: Th trng - Nh iu 3 - Website Chnh Ph - Cng bo - B T php - B KH&CN k - V Php ch - Lu VP, V KHCN

Nguyn Vn Lin

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tcxdvn 395:2007

ph gia khong cho b tng m ln

Mineral Admixtures for Roller-Compacted Concrete

H Ni, 2007

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Li ni u

Tiu chun TCXDVN 395:2007 "Ph gia khong cho b tng m ln" c B Xy dng ban hnh theo Quyt nh s .23./ 2007/ Q-BXD ngy.04.thng..6..nm 2007 .

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Tiu chun xy dng vit nam tcvn 395: 2007

Ph gia khong cho b tng m ln Mineral Admixtures for Roller-Compacted Concrete

1 Phm vi p dng

Tiu chun ny p dng cho ph gia khong ch to b tng m ln

2 Ti liu vin dn

TCVN 7570:2006 Ct liu cho b tng v va - Yu cu k thut.

TCXDVN 302:2004 Nc trn b tng v va - Yu cu k thut.

TCXDVN 311:2004 Ph gia khong hot tnh cao dng trong b tng.

Silicafume v tro tru nghin mn - Yu cu k thut.

TCVN 4030:2003 Xi mng - Phng php xc nh mn

TCVN 4032:1985 Xi mng phng php xc nh gii hn bn un v nn.

TCVN 6016:1995 Xi mng - Phng php th xc nh bn.

TCVN 6882:2001 Ph gia khong cho xi mng.

TCVN 7131:2002 t st - Phng php phn tch ho hc.

TCVN 7572-7:2006 Ct liu cho b tng v va - Phng php th - Phn 7 :

Xc nh m.

3 Thut ng, nh ngha

Trong tiu chun ny cc thut ng c nh ngha nh sau:

3.1 Ph gia khong

L vt liu v c thin nhin hoc nhn to pha vo b tng m ln dng nghin

mn t c ch tiu cht lng yu cu v khng gy nh hng xu n tnh

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WWW.VNCOLD.VN Trang WEB Hi p ln Vit Nam cht ca b tng m ln. Ph gia khong c phn thnh 2 loi: Ph gia khong

hot tnh v ph gia y.

3.2 Ph gia khong hot tnh

L ph gia khong pha vo b tng m ln dng nghin mn c hot tnh

Puzlanc.

3.3 Ph gia y

L ph gia khong pha vo b tng m ln dng nghin mn, ch yu ci

thin thnh phn c ht v cu trc xi mng.

4 Yu cu k thut

Cc ch tiu cht lng ca ph gia khong c qui nh ti bng 1.

Bng 1 - Cc ch tiu cht lng ca ph gia khong

Mc

Ph gia hot tnh

Tn ch tiu T nhin Nhn to

Ph gia y

1. Ch s hot tnh cng so vi mu i

chng, %, khng nh hn

- tui 7 ngy

- tui 28 ngy

75

75

75

75

-

-

2. Hm lng SO3, %, khng ln hn 4,0 5,0 4,0

3. Hm lng kim c hi ca ph gia, %,

khng ln hn 1,5 1,5 1,5

4. Tng hm lng cc xt

SiO2+Al2O3+Fe2O3, %, khng nh hn 70 70 -

5. m, %, khng ln hn 3,0 3,0 3,0

6. Hm lng mt khi nung, %, khng ln hn 10,0 6,0 -

7. Lng st sng 45m, %, khng ln hn 34 34 -

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8. Lng st sng 80m, %, khng ln hn - - 15,0 9. Lng nc yu cu so vi mu i chng,

%, khng ln hn 115 105 115

10. n trong thng chng p (Autoclave),

%, khng ln hn 0,8 0,8 0,8

Ghi ch:

- Vi mu ph gia khong nhn to cho php s dng lng mt khi nung n 12%

nhng phi th nghim xc nh khng gy nh hng n cc tnh cht ca b

tng m ln.

- Ngoi cc ch tiu c qui nh ti bng 1, nu c yu cu th cn phi kim tra

thm: Kh nng ngn cn phn ng Kim - Silic; bn trong mi trng

sunpht,ca ph gia khong.

5 Phng php th

5.1 Ly mu v chun b mu th theo TCVN 6882:2001

5.2 Xc nh ch s hot tnh cng theo TCVN 6882:2001

5.3 Xc nh hm lng SO3 theo TCVN 7131:2002

5.4 Xc nh hm lng kim c hi ca ph gia theo TCVN 6882:2001

5.5 Xc nh tng hm lng cc xit SiO2+Al2O3+Fe2O3 theo TCVN 7131:2002

5.6 Xc nh m ca ph gia theo TCVN 7572-7:2006 Ct liu cho b tng v

va - Phng php th - Phn 7: Xc nh m.

5.7 Xc nh hm lng mt khi nung (MKN) theo TCVN 7131:2002, nhng iu 7.1

vic xc nh lng mt khi nung nhit 10000C500C c thay th bng iu kin nhit 7500C500C.

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WWW.VNCOLD.VN Trang WEB Hi p ln Vit Nam 5.8 Xc nh lng st sng 45m theo ph lc A ca tiu chun TCXDVN 311:2004.

5.9 Xc nh lng st sng 80m theo tiu chun TCVN 4030:2003, nhng sng 90m c thay th bng sng 80m. 5.10 Xc nh lng nc yu cu nh sau:

5.10.1 Vt liu dng cho th nghim

- Xi mng: dng loi xi mng poclng tha mn cc yu cu k thut ca TCVN 2682:1999.

- Ct s dng tha mn yu cu ca TCVN 7570:2006.

- Nc trn tha mn yu cu k thut ca TCXDVN 302:2004. Cp phi ca mu i chng v mu cha ph gia th nghim c ly theo bng 2.

Bng 2. Thnh phn cp phi xc nh lng nc yu cu

Tn vt liu Mu i chng Mu th c ph gia khong

Xi mng poclng, g 500 400

Ph gia khong, g 0 100

Ct, g 1375 1375

Nc, ml 242 t xo sai lch so vi mu

i chng 5%

5.10.2. Tin hnh th

- Qu trnh trn mu theo TCVN 6016:1995

- Xc nh chy trn bn dn theo TCVN 4032:1985

5.10.3. Tnh ton kt qu

Lng nc yu cu (Nyc) c tnh ton nh sau:

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100=DC

PGyc N

NN

Trong :

NPG l lng nc trn ca mu th c ph gia khong t xe sai lch so vi

i chng 5%, tnh bng ml.

NDC l lng nc trn ca mu i chng bng 242ml.

5.11. Xc nh n trong thng chng p (autoclave) (xem ph lc A ca tiu

chun ny).

6 Ghi nhn, bo qun v vn chuyn

6.1. Khi lng mi l hng c tho thun gia bn mua v bn bn

6.2. Ph gia khong khi xut xng phi c phiu kim tra cht lng km theo,

trong ghi r:

- Tn, a ch c s sn xut;

- Loi ph gia, khi lng;

- S hiu l v giy chng nhn cht lng;

- Cc ch tiu cht lng theo tiu chun ny;

6.3. Khi vn chuyn v bo qun, cn ring ph gia khong theo tng loi v p

dng cc bin php ngn nga trnh nhim cc tp cht c hi .

Ph lc A

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ASTM C151-00 Phng php xc nh dn n ca xi mng trong thng

chng p (autoclave)

1 Phm vi p dng

Phng php th ny xc nh n ca xi mng pooclng trong autoclave

bng cch th mu h xi mng.

2 Ti liu vin dn

ASTM C187 Test method for normal consistency of hydraulic cement.

ASTM C305 Practice for mechanical mixing of hydraulic cement pastes and mortars

of plastic consistency.

ASTM C490 Practice for use of apparatus for determination of length change of

hardened cement paste, mortar and concrete.

ASTM C511 Specification for moist cabinets, moist rooms, and water storage tanks

used in the testing of hydraulic cements and concretes.

ASTM C1005 Specification for weights and weighing devices for use in the physical

testing of hydraulic cements.

3 Thit b

- Cn xc nh khi lng vt liu theo yu cu ca ASTM C1005.

- ng thy tinh 200 hoc 250ml

- Khun c kch thc 25x25x285mm ph hp yu cu ca ASTM C490.

- Bay phng c mp thng v chiu di 100-150mm.

- Thng chng p c lp mt b iu khin p lc t ng v mt ci a ngt khi

p sut bng 2,4MPa5%. ni khng cho php dng a ny th c th dng van an ton. Ngoi ra cn c mt van thng kh khng kh thot ra trong giai on

u ca qu trnh gia nhit v hi nc cn li lc kt thc qu trnh ngui. ng

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h p lc c cng sut 4,1Mpa, mt s c ng knh 114mm c chia t 0-

4,1Mpa vi vch chia khng qu 0,03Mpa, sai s ca ng h khng vt qu

0,02Mpa p lc lm vic 2Mpa. Cng sut ca b phn gia nhit phi m bo

sao cho vi trng lng ca nc v mu p sut ca hi nc bo ha trong thng

c th tng ln n p sut ca ng h bng 295Psi (2MPa) trong vng 45 n 75

pht tnh t lc bt u gia nhit. B khng ch p lc t ng phi c kh nng duy

tr c p lc ng h 20,07Mpa trong t nht 3 gi, p lc ca ng h 29510Psi (20,07MPa) tng ng vi nhit 42030F (21620C). Thng autoclave phi c thit k cho p lc ng h gim t 295Psi (2MPa) n nh

hn 10Psi (0,07MPa) trong vng 1,5gi sau khi ngt ngun cung cp nhit.

a ngt: phi c lm bng vt liu c cng ko tng i khng nhy

cm vi nhit trong di t 20-2160C v n ph hp v in ha vi ng dn n

n v ng dn n gi .

My o chiu di dng o s thay i chiu di ca mu phi ph hp vi

ASTM C490.

4 Ch v an ton

ng h p lc phi c gii hn o ti a l 600Psi (4,1Mpa), nu ln hn

hoc nh hn u gy ra ri ro, v vi p lc lm vic cc i qui nh th khi dng

ng h p lc nh, p lc c th chch ra ngoi thang chia; cn khi dng ng h

cng sut ln hn, th cung dch chuyn c th qu nh gy s ch . Ngi vn

hnh phi ch khng kim ng h khng vt qu vch ln nht ca thang

chia .

Lun lun dng mt nhit k cng vi ng h o pht hin c h hng

no ca ng h thao tc ng v ch bo mt iu kin bt thng no

.

Duy tr b khng ch t ng trt t lm vic ng trong sut thi gian lm vic.

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WWW.VNCOLD.VN Trang WEB Hi p ln Vit Nam t van an ton x p lc khong 6-10% trn p lc ti a (2,1Mpa)

c qui nh trong th nghim ny, tc l khong 2,3Mpa. Th li van an ton mi

nm 2 ln, th vi mt thit b th ng h hoc bng cch hiu chnh b t ng

cho autoclave t p lc khong 330Psi (2,27MPa), mc p lc ca van an

ton hoc m hoc c hiu chnh m, thng van an ton x ra xa ngi vn

hnh.

Ngi th nghim cn eo gng tay da trnh b bng khi m np autoclave

lc kt thc th nghim, phi hng van thot kh ra xa ngi lm th nghim; khi m

np autoclave xoay n sao cho hi thot ra t bn di np m bo an ton

cho ngi vn hnh. Ch trnh b bng do cht lng bn trong autoclave gy nn.

Ch l i vi cc ng h p lc ca autoclave sau khi ngng chy my th

khng cn thit phi ch s 0 ca p lc trong thng autoclave, c th sau vn

tn ti mt p sut nguy him ng k.

5 S lng mu th

Lm ti thiu mt mu th nghim.

6 Chun b khun mu

Chun b khun theo ASTM C490 v cn phi kn kht.

7 Chun b mu th

7.1. Trn h xi mng

Chun b m trn tiu chun gm 650g xi mng vi lng nc h t

do tiu chun ph hp vi tiu chun ASTM C187, qu trnh trn theo ASTM

C305.

7.2. c mu

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Sau khi trn mu xong, c mu theo 2 lp bng nhau. Mi lp c lm cht

bng n ngn tay ci vo h cc gc, xung quanh u o v dc theo mt khun

cho n khi mu t c s ng nht, m cht lp trn cng, ri ct b phn

tha bng bay mng v lm phng mt. Trong khi trn v c khun phi eo gng

tay cao su.

7.3. Bo dng mu

t khun vo phng m t nht 20gi. Nu tho khun trc 24gi, mu phi

c gi trong phng m cho ti khi th.

8 Tin hnh th

8.1. Sau khi c khun 24gi30pht ly mu ra khi phng m, o chiu di ca tng mu v t vo autoclave nhit phng trong mt ci gi sao cho tt c

cc mt ca mu c tip xc vi hi nc bo ha. Autoclave phi cha nc

c nhit ban u 20-280C duy tr mi trng hi nc bo ha trong ton b

qu trnh th nghim thng thng khong 7-10% th tch autoclave.

8.2. khng kh thot ra khi autoclave, trong giai on u ca qu trnh gia

nhit h van thot kh cho n kh hi nc bt u thot ra. ng van v nng

nhit trong autoclave vi tc sao cho t c 2Mpa trong vng 45-75pht

tnh t khi bt u gia nhit. Duy tr p lc 2Mpa0,07Mpa trong 3gi. Sau thi gian ny ct ngun gia nhit v ngui autoclave vi tc sao cho p lc gim xung

di 10Psi (0,07Mpa) sau 1gi 30pht, sau h dn p lc bng cch m dn van

thot kh cho n khi t c p sut kh quyn. Sau m autoclave v t mu

th trong nc nhit trn 900C, lm ngui nc xung quanh cc thanh mu vi

tc u bng cch nc lnh vo sao cho nhit ca nc h xung ti

230C trong vng 15pht, duy tr nc xung quanh mu 740F trong 15pht, sau

lm kh b mt ca mu v o chiu di tng mu.

9 Tnh ton

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WWW.VNCOLD.VN Trang WEB Hi p ln Vit Nam Tnh ton s thay i chiu di ca thanh va bng cch tr s c ca ng

h o trc v sau khi dng h trong autoclave. Kt qu tnh chnh xc n 0,01%.

Ghi li kt qu tng chiu di thanh va do n trong autoclave v thm du (-) trc

kt qu gim chiu di thanh va.

10 chnh xc v sai s

Trong phng th nghim, vi cng mt ngi th nghim lch chun l

0,024% trong phm vi n t 0,11 n 0,94%. V vy hai kt qu th nghim gia

hai ln o khng c khc nhau qa 0,07% trn cng mt m trn vi cng mt

ngi th nghim. lch chun gia cc phng th nghim l 0,03% trong phm vi

n t 0,11 n 0,94%. V vy hai kt qu th nghim gia hai phng th nghim

khc nhau khng c khc nhau qu 0,09% trn cng mt m trn.

5.1 Ly mu v chun b mu th theo TCVN 6882:2001

tcxdvn 395-2007 phụ gia khoáng cho bê tông Đầm lăn

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