TCVN 8860-6 Xac Dinh Do Chay Nhua

5

TCVN T I U C H U N Q U C G I A

TCVN 8860-6 : 2011

Xut bn ln 1

B TNG NHA - PHNG PHP TH - PHN 6: XC NH CHY NHA

Asphalt Concrete Test methods

Part 6: Determination of Draindown

H NI - 2011

TCVN 8860-6 : 2011

3

Mc lc

1 Phm vi p dng ..................................................................................................................... 5

2 Thut ng v nh ngha ......................................................................................................... 5

3 Nguyn tc ............................................................................................................................... 5

4 Thit b, dng c ..................................................................................................................... 5

5 iu kin th nghim ............................................................................................................... 6

6 Chun b mu ........................................................................................................................... 6

7 Cch tin hnh ......................................................................................................................... 6

8 Biu th kt qu ....................................................................................................................... 7

9 Bo co th nghim................................................................................................................. 7

Ph lc A (Tham kho): Mu bo co kt qu th nghim ..................................................... 8

4

Li ni u

TCVN 8860-6 : 2011 c chuyn i t 22 TCN 62-84 theo quy nh ti khon 1

iu 69 ca Lut Tiu chun v Quy chun k thut v im a khon 1 khon 1 iu

7 Ngh nh s 127/2007/N-CP ngy 1/8/2008 ca Chnh ph quy nh chi tit thi

hnh mt s iu ca Lut Tiu chun v Quy chun k thut.

TCVN 8860-6 : 2011 do Vin Khoa hc v Cng ngh Giao thng Vn ti bin son,

B Giao thng Vn ti ngh, Tng cc Tiu chun o lng cht lng thm nh,

B Khoa hc v Cng ngh Cng b.

B tiu chun TCVN 8860 : 2011 B tng nha Phng php th gm mi hai

phn:

- TCVN 8860-1 : 2011, Phn 1: Xc nh n nh, do Marshall

- TCVN 8860-2 : 2011, Phn 2: Xc nh hm lng nha bng phng php

chit s dng my quay li tm

- TCVN 8860-3 : 2011, Phn 3: Xc nh thnh phn ht

- TCVN 8860-4 : 2011, Phn 4: Xc nh t trng ln nht, khi lng ring ca b

tng nha trng thi ri

- TCVN 8860-5 : 2011, Phn 5: Xc nh t trng khi, khi lng th tch ca b

tng nha m nn

- TCVN 8860-6 : 2011, Phn 6: Xc nh chy nha

- TCVN 8860-7 : 2011, Phn 7: Xc nh gc cnh ca ct

- TCVN 8860-8 : 2011, Phn 8: Xc nh h s cht lu ln

- TCVN 8860-9 : 2011, Phn 9: Xc nh rng d

- TCVN 8860-10 : 2011, Phn 10: Xc nh rng ct liu

- TCVN 8860-11 : 2011, Phn 11: Xc nh rng lp y nha

- TCVN 8860-12 : 2011, Phn 12: Xc nh n nh cn li ca b tng nha

TCVN 8860-6 : 2011

5

T I U C H U N Q U C G I A TCVN 8860-6 : 2011

B tng nha - Phng php th -

Phn 6: Xc nh chy nha

Asphalt Concrete - Test methods -

Part 6: Determination of Draindown

1 Phm vi p dng

Tiu chun ny quy nh phng php xc nh chy nha ca hn hp b tng nha (BTN), thng p dng i vi BTN c rng ln bao gm BTN cp phi h, BTN cp phi gin on nh gi kh nng n nh nh chng chy nha ca hn hp trong qu trnh sn xut, vn chuyn v thi cng.

2 Thut ng v nh ngha

Trong tiu chun ny s dng thut ng v nh ngha sau:

chy nha ca BTN (Draindown)

T l phn trm gia lng hn hp (bao gm c nha ng v ct liu mn) chy ra khi r cha hn hp

BTN khi nung mu nhit v thi gian quy nh so vi khi lng mu ban u.

3 Nguyn tc

Mu BTN c chun b trong phng hoc ly t hin trng. Cho mu BTN trng thi ri vo trong r

thp, t r thp ln trn mt chic a kim loi. Sy ton b a cha r thp v mu BTN nhit v

khong thi gian quy nh. Xc nh lng hn hp chy ra khi r thp cha trong a kim loi, tnh chy

nha ca BTN.

4 Thit b, dng c

4.1 T sy c thng gi, iu chnh c nhit vi chnh xc 2 oC, c kh nng sy nhit trong

phm vi t 110 oC n 175 oC.

4.2 R ng mu: hnh tr, chiu cao 165 mm, ng knh 108 mm. R c ch to bng li kim loi, l

vung, kch c 6,3 mm ( nh kch c sng l vung 6,3 mm). y r c thit k cao hn y thnh bn 25

mm (Hnh 1).

4.3 a kim loi bn nhit hng lng nha chy ra t hn hp BTN.

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4.4 Cn c chnh xc ti 0,1 g.

4.5 Dng c trn: cho, bay.

y r

Hnh 1 - Kch thc r ng mu

5 iu kin th nghim

5.1 Trong qu trnh thit k hn hp, th nghim chy nha hai nhit : nhit quy nh trn hn

hp ti trm trn (T) v nhit cao hn 15 oC (T+15 oC) xt ti iu kin thc t c th xy ra trong trm

trn.

5.2 Trong qu trnh sn xut, ch cn th nghim chy nha nhit quy nh trn hn hp trong

trm trn.

6 Chun b mu

ng vi mi nhit th nghim, chun b 2 mu BTN, mi mu c khi lng 1 200 g 200 g.

7 Cch tin hnh

7.1 Sy mu, r ng mu v a kim loi n khi lng khng i.

7.2 Xc nh khi lng r thp chnh xc ti 0,1 g (k hiu l A). Chuyn mu hn hp sy vo r. m

bo nhit hn hp BTN khi cho vo r khng nh hn 25 oC so vi nhit th nghim. Xc nh khi

lng r ng mu c cha mu BTN chnh xc ti 0,1 g (k hiu l B).

7.3 Xc nh khi lng a kim loi chnh xc ti 0,1 g (k hiu l C). t r cha mu ln a kim loi v

cho tt c vo t sy gia nhit ti nhit th nghim, duy tr trong thi gian 60 min 5 min. Trng hp

nhit hn hp BTN khi cho vo r nh hn 25 oC so vi nhit th nghim, thi gian duy tr mu trong l

nhit th nghim l 70 min 5 min.

TCVN 8860-6 : 2011

7

7.4 a mu ra khi l sy. Nhc r ng mu ra, xc nh khi lng a kim loi c lng nha ng

trong a chnh xc ti 0,1 g (k hiu l D).

8 Biu th kt qu

8.1 chy nha ca mu BTN (M), tnh bng phn trm (%), chnh xc ti 0,1%, theo cng thc:

)(

)(100

AB

CDxM

trong :

A l khi lng ca r, tnh bng gam (g);

B l khi lng ca r v mu, tnh bng gam (g);

C l khi lng ca a, tnh bng gam (g);

D l khi lng ca a v hn hp nha chy ra, tnh bng gam (g).

8.2 chy nha ca BTN nhit th nghim l gi tr trung bnh cng s hc ca hai kt qu th

nghim.

9 Bo co th nghim

Kt qu th nghim cn c cc thng tin sau:

- Ngun gc vt liu;

- Loi BTN;

- chy nha ca BTN nhit th nghim;

- Ngi th nghim v c s th nghim;

- Vin dn tiu chun ny.

8

Ph lc A

(Tham kho)

Mu bo co kt qu th nghim

S:.............../ LAS-XD

1. n v yu cu :

2. Cng trnh :

3. Hng mc: 4. Loi b tng nha:

5. Ngun gc mu: 6. M s mu:

7. Ngy nhn mu: 8. Ngy th nghim:

9. Tiu chun p dng: TCVN 8860-6 : 2011

10. Kt qu th nghim:

1 2 Trung bnh

A

B

C

D

11. Ghi ch:

12. Nhng ng-i thc hin:

Ng-i th nghim: (H tn, ch k)

Ng-i lp bo co: (H tn, ch k)

Ng-i kim tra: (H tn, ch k)

T- vn gim st: (H tn, ch k)

Tn n v thc hin

Khi l-ng r (g)

Khi l-ng r cha mu (g)

Khi l-ng ca a (g)

Khi l-ng a v hn hp nha (g)

kt qu th nghim chy nha ca b tng nha

Phng th nghim LAS-XD

Mu th nghim s:

a ch: Tel/Fax: Email:

, ngythng.nm.

chy nha (%): AB

CDxM 100

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TCVN 8860-6 Xac Dinh Do Chay Nhua