5

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

TCVN 8860-3 : 2011

Xut bn ln 1

B TNG NHA - PHNG PHP TH - PHN 3: XC NH THNH PHN HT

Asphalt Concrete Test methods

Part 3: Determination of particle size distribution

H NI - 2011

2

TCVN 8860-3 : 2011

3

Mc lc

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

2 Nguyn tc ............................................................................................................................... 5

3 Thit b, dng c ..................................................................................................................... 5

4 Chun b mu ........................................................................................................................... 5

5 Cch tin hnh ......................................................................................................................... 6

6 Biu th kt qu ....................................................................................................................... 7

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

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

4

Li ni u

TCVN 8860-3 : 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 8860-3 : 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 8860-3 : 2011

5

T I U C H U N Q U C G I A TCVN 8860-3 : 2011

B tng nha - Phng php th -

Phn 3: Xc nh thnh phn ht

Asphalt Concrete - Test Methods -

Part 3: Determination of particle size distribution

1 Phm vi p dng

Tiu chun quy nh phng php sng xc nh thnh phn ht ct liu ca b tng nha (BTN) thu

c sau khi tch nha.

2 Nguyn tc

Ct liu b tng nha sau khi chit nha c sy kh, cn xc nh khi lng v phn chia thnh cc c

ht bng cch sng qua b sng gm nhiu sng c kch c mt sng gim dn.

3 Thit b, dng c

3.1 S dng b sng mt vung ASTM vi cc c sng theo Bng 1.

Bng 1 - B sng li mt vung dng xc nh thnh phn ht ca ct liu

Kch thc mt sng

mm

50 37,5 25,0 19,0 12,5 9,5 4,75 2,36 1,18 0,6 0,3 0,15 0,075

CH THCH: C th s dng thm cc sng trung gian c kch thc khc tu theo yu cu ring ca tng loi BTN.

3.2 T sy c b phn iu chnh nhit m bo nhit sy n nh nhit 110 oC 5 oC .

3.3 Cn k thut, chnh xc 0,1 %.

3.4 My lc sng (khng bt buc), c khuyn khch s dng.

4 Chun b mu

4.1 Mu c sy n khi lng khng i nhit 110 oC 5 oC v ngui n nhit trong phng

th nghim.

4.2 Khi lng mu ti thiu yu cu ph thuc vo c ht ln nht danh nh ca BTN, c qui nh trong

Bng 2.

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Bng 2 - Khi lng mu tu thuc vo kch c ht ln nht danh nh ca ct liu

C ht ln nht danh nh (Dmax) mm

Khi lng mu ti thiu

kg

4,75 0,5

9,5 1,0

12,5 1,5

19,0 2,0

25,0 3,0

37,5 4,0

5 Cch tin hnh

5.1 Xp chng b sng c th t kch thc mt sng t nh n ln trn y sng. Kch thc mt sng

trn cng ln hn c ht ln nht danh nh Dmax ca loi BTN th nghim.

5.2 dn ct liu vo sng trn cng v tin hnh sng. C th dng my sng hoc lc bng tay. Khi

dng my sng th thi gian sng theo quy nh ca tng loi my. Khi sng bng tay th thi im dng sng

l khi sng trong 1 min m lng lt qua mi sng khng vt qu 1 % khi lng vt liu trn sng .

5.3 Lng ct liu trn tng sng khi kt thc qu trnh sng khng ln ln 7 kg/m2 tnh trn din tch mt

li sng i vi sng c mt nh hn 4,75 mm. i vi sng c c mt li t 4,75 mm tr ln, khi lng

ct liu trn sng tnh bng kilgam khng ln hn 2,5 ln tch s gia c mt sng tnh bng milimt v din

tch li sng tnh bng mt vung. Khi lng vt liu ti a trn sng i vi mt s khun sng li mt

vung thng dng c quy nh ti Bng 3.

Bng 3 - Khi lng ct liu ti a cho php trn sng tnh bng kilgam

Kch thc mt sng mm

ng knh ca khun sng 203mm 254mm 305mm

50 3,6 5,7 8,4

37,5 2,7 4,3 6,3

25,0 1,8 2,9 4,2

19,0 1,4 2,2 3,2

12,5 0,9 1,4 2,1

9,5 0,7 1,1 1,6

4,75 0,3 0,5 0,8

< 4,75 0,2 0,3 0,5

CH THCH: C th khng ch hin tng qu ti trn cc sng cc b bng cc bin php sau:

- B sung sng c c trung gian gia sng c kh nng qu ti v sng c c ln hn k tip;

- S dng b sng kch c ln hn hoc chia mu thnh cc phn nh, sng cc phn ring r, gp khi lng st trn sng

cng c cc ln sng khc nhau trc khi tnh t l lng st trn sng.

5.4 Cn lng st trn tng sng v lng lt sng 0,075 mm nm trn khay y. Tng khi lng mu sau

khi sng khng c sai khc qu 0,3 % so vi khi lng mu ban u.

TCVN 8860-3 : 2011

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6 Biu th kt qu

6.1 Lng st ring trn tng sng kch thc mt sng i (ai ), tnh bng phn trm khi lng, chnh xc

n 0,1 %, theo cng thc:

ai = m

mi100 (1)

trong :

mi l khi lng phn cn li trn sng c kch thc mt sng i, tnh bng gam (g);

m l tng khi lng mu th, tnh bng gam (g).

6.2 Lng st tch lu trn sng kch thc mt sng i, l tng lng st ring trn cc sng c kch thc

mt sng ln hn n v lng st ring bn thn n. Lng st tch lu (Ai ), tnh bng phn trm khi lng,

chnh xc ti 0,1 %, theo cng thc:

Ai = ai +ai+1...an-1+an (2)

trong :

ai l lng st ring trn sng c kch thc mt sng i, tnh bng phn trm khi lng (%);

an l lng st ring trn sng c kch thc mt sng ln nht n, tnh bng phn trm khi

lng (%).

7 Bo co th nghim

Bo co th nghim cn c cc thng tin sau:

- Ngun gc mu;

- Loi BTN;

- Khi lng mu;

- Lng st trn tng sng, tnh bng gam;

- Lng st trn tng sng, tnh theo phn trm khi lng;

- Lng st tch lu trn tng sng, tnh theo phn trm khi lng;

- Ngi th nghim v c s th nghim;

- Vin dn tiu chun ny.

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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 8860-3 : 2011

10. Kt qu th nghim:

25 19 12.5 9.5 4.5 2.36 1.18 0.6 0.3 0.15 0.075

100 90 71 58 36 25 17 12 8 6 5

100 100 86 78 61 45 33 25 17 12 8

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) , ngythng.nm.

T- vn gim st: (H tn, ch k) Phng th nghim LAS-XD

-ng cong cp phi mu th nghim

Khi l-ng mu th nghim (g):

HL st trn sng (%)

Yu cu k thut (%)

a ch: Tel/Fax: Email:

L-ng lt qua sng (%)

Tn n v thc hin

KL st trn sng (g)

Kch c mt sng (mm)

Bo co kt qu th nghim phn tch thnh phn ca b tng nha

0

10

20

30

40

50

60

70

80

90

100

0.01 0.1 1 10 100

Kch c mt sng (mm)

L-

n

g l

t

sn

g(%

)