5

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

TCVN 8860-1 : 2011

Xut bn ln 1

B TNG NHA - PHNG PHP TH - PHN 1: XC NH N NH, DO MARSHALL

Asphalt Concrete Test methods

Part 1: Determination of Marshall Stability and Plastic Flow

H NI - 2011

2

Mc lc

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

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

3 Xc nh n nh, do Marshall..................................................................................... 6

4 Xc nh n nh, do Marshall ci tin ........................................................................ 13

Ph lc A (Tham kho): Mu bo co kt qu th nghim ..................................................... 15

TCVN 8860-1 : 2011

3

Li ni u

TCVN 8860-1 : 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 8860-1 : 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

4

T I U C H U N Q U C G I A TCVN 8860-1 : 2011

B tng nha - Phng php th -

Phn 1: Xc nh n nh, do Marshall

Asphalt Concrete - Test methods -

Part 1: Determination of Marshall Stability and Plastic Flow

1 Phm vi p dng

1.1 Tiu chun ny quy nh phng php xc nh n nh, do Marshall ca b tng nha s dng

nha ng c (vit tt l BTN) c c ht ln nht danh nh (theo sng vung) khng vt qu 19,0 mm;

1.2 Tiu chun ny cng quy nh phng php xc nh n nh, do Marshall ci tin i vi BTN c

c ht ln nht danh nh ln hn 19,0 mm nhng khng vt qu 37,5 mm.

2 Thut ng v nh ngha

Tiu chun ny s dng cc thut ng v nh ngha sau:

2.1 n nh Marshall (Marshall Stability)

Gi tr lc nn ln nht t c khi th nghim mu BTN chun (mu hnh tr ng knh 101,6 mm, chiu

cao 63,5 mm) trn my nn Marshall, n v tnh l kilniutn (kN). Trng hp mu c chiu cao khc 63,5

mm th hiu chnh xc nh n nh Marshall.

2.2 do Marshall (Marshall Flow)

Bin dng ca mu BTN trn my nn Marshall ti thi im xc nh n nh Marshall, n v tnh l

milimt (mm).

2.3 n nh Marshall ci tin (Modified Marshall Stability)

Gi tr lc nn ln nht t c khi th nghim mu BTN ci tin chun (mu hnh tr ng knh 152,4

mm, chiu cao 95,2 mm) trn my nn Marshall, n v tnh l kilniutn (kN). Trng hp mu c chiu cao

khc 95,2 mm th hiu chnh xc nh n nh Marshall ci tin.

2.4 do Marshall ci tin (Modified Marshall Flow)

Bin dng ca mu BTN trn my nn Marshall ti thi im xc nh n nh Marshall ci tin, n v tnh

l milimt (mm).

TCVN 8860-1 : 2011

5

3 Xc nh n nh, do Marshall

3.1 Nguyn tc

Mu BTN hnh tr c kch thc quy nh c ngm trong b nc n nhit trong iu kin xc nh v

nhit , thi gian v sau c nn n ph hu trn my nn Marshall. Xc nh gi tr lc nn ln nht

v bin dng mu cng thi im tnh n nh, do Marshall.

3.2 Thit b, dng c

3.2.1 My nn Marshall bao gm cc b phn chnh: khung my, kch gia ti, thit b o lc v ng h o

bin dng ca mu (xem Hnh 1).

A

A

ng c in

Khung my

Thit b o lc

Mt tr-c ca my Mt ct A-A

Kch gia ti

Hnh 1 - My nn Marshall

3.2.1.1 B phn gia ti c tc gia ti khng i trong qu trnh th nghim l 50,8 mm/min.

3.2.1.2 Thit b o lc c chnh xc n 10 daN, s dng vng ng bin hoc u o lc load cell c di

o ph hp.

3.2.1.3 ng h o bin dng c chnh xc n 0,01 mm (xem Hnh 2).

Thin phn k

Gi ng dn hung

Hnh 2 ng h o bin dng

3.2.2 B khun c mu gm cc khun kim loi hnh tr rng c ng knh trong 101,6 mm 0,2 mm,

khun v khun dn (xem Hnh 3).

6

Kch thc tnh bng milimt

120,6

69

,88

7,3

101,2

7,1

6,4

3,2

101,47101,73

104,8

Khun dn

Khun m

khun

114,3

109,1

108,7

114,3

Hnh 3 - Khun c mu

3.2.3 Ba m bng kim loi, c b mt m hnh trn, phng, c trng lng 4536 g 9 g. Chiu cao ri t

do ca ba l 457 mm 2 mm (xem Hnh 4).

Kch thc tnh bng milimt

98,4

Thanh dn hung

Tay cm

Qu

b

a

c

tr

ng

lu

n

g 4

53

6g

Hnh 4 - Ba m

TCVN 8860-1 : 2011

7

3.2.4 B m hnh tr bng g kch thc 203 mm x 203 mm x 457 mm c bt u bng bn thp kch

thc 305 mm x 305 mm x 25 mm. G lm b m c th l g thng hoc loi g khc vi khi lng th

tch kh t 0,67 g/cm3 n 0,77 g/cm3. B g c neo thng ng trn sn b tng cng bi 4 bn thp

gc.

3.2.5 B g gi khun c c gn vi b m c tc dng nh v tm ca khun c mu trng vi

tm ca b m, gi b khun c mu khng dch chuyn trong qu trnh m to mu.

3.2.6 B phn nn mu gm hai vnh thp mt tr trn bn knh mt trong tip xc vi mu l 50,8mm (xem

Hnh 5).

Kch thc tnh bng milimt

1

3

6

4

5

6ng dn h-ng

u tip hp 4

Bn 35

Vnh thp d-i 2

1Vnh thp trn

thanh dn h-ng

r50,8

23,8

R17

,5

R17

,5

r17,

5

r17

,5

R 5

0,8

23,8

15,9

22,217,5

34,9

9,56,4

19,0

38,1

38,1

63,5

23,8

73,0

146,0

73,0

76,2

38,1

15,9

146,0

38,1

38,1

58,7

58,7

152

,4

9,5

76,2

38,1

1,6

9,5

6,4

38,1

6,41,615,9

58,7

58,7

152

,4

19,0

23,8

12,7

63,5

22,2

12,6 146,0

19,012,7

1,6

38,1

38,1

101

,6

4,819,0

6,414,3

76,2

14,3 6,4

3,2

19,0

3,2

Hnh 5 B phn nn mu

3.2.7 Dng c tho mu gm khung thp, a thp v kch. a thp hnh tr c chiu dy ti thiu 13 mm,

ng knh 100 mm c dng truyn lc t kch ln b mt mu, tng mu ra khi khun m (xem

Hnh 6).

3.2.8 T sy c b phn iu khin nhit vi chnh xc ti thiu l 3oC, c th duy tr nhit ti 300

oC.

3.2.9 Thit b trn BTN: c th trn bng my hoc bng tay vi chu trn c dung tch ph hp to ra hn

hp ng nht trong khong thi gian yu cu.

8

3.2.10 Thit b gia nhit: s dng bp nung, bn ct, n hng ngoi hoc cc thit b ph hp cung cp

nhit cho chu trn nhm duy tr nhit ca BTN trong sut qu trnh trn. Trong trng hp s dng bp

nung, cn trnh s tip xc trc tip gia bp nung v chu trn khng gy qu nhit cc b.

a thp

Kch tho mu

Khung thp

Hnh 6 - Dng c tho mu

3.2.11 B n nhit: c th duy tr nhit ca nc trong b 60 oC 1 oC. B n nhit c chiu su ti

thiu l 150 mm v 230 mm tng ng khi th nghim mu Marshall thng thng v mu Marshall ci tin,

b c gi mu nm cch y b 50 mm.

3.2.12 Khay dng gia nhit cho ct liu.

3.2.13 Dng c cha nha ng nng: bt s, bt thu tinh, cc m, hp tn...

3.2.14 Bay trn, thanh gt.

3.2.15 Nhit k xc nh nhit ct liu, nha ng, BTN: nhit k c khong o t 10 oC n 200 oC

vi chnh xc 1 oC.

3.2.16 Cn 5 kg, chnh xc 0,1 g dng cn vt liu Chun b mu, cn mu.

3.2.17 Cn 10 kg, chnh xc 1,0 g dng chun b ct liu.

3.2.18 Thc kp, chnh xc 0,1 mm.

3.2.19 Gng tay chu nhit: dng cm, nm cc thit b nng n 200 oC.

3.2.20 Gng tay cao su chu nhit: dng ly mu khi b n nhit.

3.2.21 Bt nh du mu.

3.2.22 Mi mc, tha: dng xc ct liu, BTN.

TCVN 8860-1 : 2011

9

3.3 Chun b mu

3.3.1 Chun b mu t cc vt liu thnh phn

3.3.1.1 T mu bao gm ti thiu 3 mu ng vi mt loi cp phi ct liu v mt hm lng nha xc nh.

3.3.1.2 Chun b ct liu

3.3.1.2.1 Sy kh ct liu ct, , bt khong nhit 105oC n khi lng khng i. Sng hn hp ct

liu thnh nhng phn c c ht ph hp vi tng loi BTN c quy nh trong cc quy trnh cng ngh thi

cng tng ng.

3.3.1.2.2 Cn ct liu v cn bt khong cho tng m trn, mi m ng trong cc khay ring. Khi lng

m trn c xc nh sao cho mu ca m trn sau khi m nn c chiu cao 63,5 mm 1,3 mm (khi

lng m trn thng thng l 1 200 g).

3.3.1.3 Trn mu BTN

3.3.1.3.1 Trn u hn hp ct liu, bt khong v gia nhit trong l sy hoc bp nung ti nhit quy nh;

3.3.1.3.2 Cn nha ng vo cc hp ng ring dng cho tng m trn, gia nhit cho nha ng ti

nhit trn quy nh. Trt ct liu nung nng vo cho trn, dng bay to h trng gia khi ct liu v

trt lng nha ng nng vi khi lng xc nh vo h trng, nhanh chng trn u n khi nha

ng bao ph hon ton ct liu. Lu khng lm vng ct liu ra khi cho trn trong qu trnh trn. S

dng thit b gia nhit duy tr nhit trn ca hn hp;

3.3.1.3.3 M trn u tin c dng trng cc dng c trn, BTN ca m trn ny c trt b hoc

c tn dng c mu vi mc ch iu chnh khi lng m trn nhm t c chiu cao mu quy nh.

Vt liu dnh cho trn, bay trn c gt b bng thanh gt hoc bng mi, tha. Khng dng gi chi

hoc dung dch ra lm sch dng c trn tr khi thay i loi nha hoc kt thc qu trnh c mu.

3.3.1.3.4 Khuyn khch s dng my trn mu b tng nha chuyn dng. S dng thit b theo hng dn

ca nh sn xut.

CH THCH 1: Nhit trn mu Marshall c quy nh ti cc quy trnh thi cng v nghim thu BTN tng ng.

3.3.1.4 c mu

3.3.1.4.1 Lau chi sch b mt ba m, khun c mu. Gia nhit trong t sy cho ba m v b khun

c mu ti nhit 105 oC 5 oC. t mt ming giy lc hnh trn ng knh 10 cm vo trong lng khun

c pha trn y khun, lp khun dn v trt ton b BTN vo khun.

3.3.1.4.2 Xc mnh bay nung nng 15 ln xung quanh chu vi v 10 ln khu vc gia khun cha BTN.

Dng bay vun b mt hn hp hi vng ln tm khun. Nhit ca hn hp ngay trc khi m nn phi

nm trong gii hn nhit m to mu.

3.3.1.4.3 t mt ming giy hnh trn ng knh 10 cm vo trong lng khun trn nh BTN. t b khun

c cha mu vo b g gi trn b m, tin hnh m vi s c m theo quy nh ca Quy trnh cng

ngh thi cng v nghim thu BTN tng ng (thng l 75 hoc 50 c m trn mt mt).

10

3.3.1.4.4 o ngc khun m mt trn ca mu tip xc vi khun. Lp li b khun ln g v m

tip trn mt cn li ca mu vi cng s c m nh thc hin mt i din ca mu. Sau khi m

mu, mu ngui n nhit trong phng, dng dng c tho mu y mu ra khi khun. t mu

trn b mt phng, chc chn iu kin nhit trong phng t nht l 12 h trc khi th nghim.

CH THCH 2: Nhit m to mu Marshall c quy nh ti cc quy trnh thi cng v nghim thu BTN tng ng.

3.3.2 Chun b mu BTN ly ti trm trn, ti phu my ri

3.3.2.1 Mi t mu bao gm ti thiu 3 mu.

3.3.2.2 Mu BTN phi nhit m nn theo quy nh. BTN khng nhit m nn th phi loi b,

khng gia nhit b sung trc khi m nn mu.

3.3.2.3 c mu: Theo 3.3.1.4.

3.3.3 Chun b mu BTN ly t mt ng c

3.3.3.1 Mi t mu bao gm ti thiu 3 mu.

3.3.3.2 Vt liu BTN mt ng c c gia nhit khng qu 115 oC trong khong thi gian va c

th lm ti mu. Loi b nhng ht ct liu b ct, v trong qu trnh ly mu. Gia nhit cho hn hp b tng

nha n nhit m nn theo quy nh.

3.3.3.3 c mu: Theo quy nh ti 3.3.1.4.

3.3.4 Chun b mu t li khoan BTN

3.3.4.1 Mi t mu thng thng gm 3 mu c gia cng t mu khoan BTN mt ng. Trng hp

c bit cho php dng ti thiu l 2 mu.

3.3.4.2 Mu c dng hnh tr, hai y song song v vung gc vi ng sinh ca mu. Mu phi m bo

khng b bin dng, nt v.

3.3.4.3 B mt y mu khoan phi phng, khng c dnh vi cc vt liu khc. Trong trng hp t ,

BTN lp di mt ng gn kt vi y mu th s dng ca loi b chng.

3.3.4.4 ng knh mu khoan nm trong khong 99,6 mm n 101,6 mm.

3.3.4.5 Chiu cao mu sau khi gia cng nm trong phm vi t 30 mm n 70 mm, thch hp nht l 63,5

mm.

3.4 Cch tin hnh

3.4.1 o chiu cao trung bnh ca cc vin mu: Chiu cao trung bnh ca mu l trung bnh ca 4 gi tr o

ti cc im phn t chu vi mu, xc nh chnh xc ti 0,1 mm.

3.4.2 Gia nhit cho b n nhit n nhit n nh 60 oC 1 oC, ngm mu trong b n nhit trong thi gian

40 min 5 min.

TCVN 8860-1 : 2011

11

3.4.3 Lau sch mt trong hai vnh thp nn mu. Vt mu BTN ra khi bn nc n nhit v nhanh chng

t vo gia hai vnh nn, a b phn nn mu vo v tr th nghim trn my nn, g ng h o do

v iu chnh kim ng h v 0.

3.4.4 Gia ti cho mu v quan st ng h o lc, ng h o bin dng ca mu. Khi ng h o lc t gi

tr ln nht (v bt u c xu hng gim) th ghi li s c trn ng h o lc ng thi ghi li s c trn

ng h o bin dng.

3.4.5 Khuyn khch s dng My nn Marshall c trang b cc u o lc, u o bin dng in t cho

php thu nhn, lu tr v x l s liu bng phn mm chuyn dng.

3.4.6 Thi gian th nghim t khi ly mu BTN ra khi bn n nhit n khi xc nh c gi tr lc nn ln

nht khng c vt qu 30 s.

3.5 Biu th kt qu

3.5.1 n nh Marshall ca mu (S), tnh bng kilniutn (kN), chnh xc ti 0,1 kN, theo cng thc:

S = K.P (1) trong :

K l h s iu chnh, ni suy t Bng 1;

P l lc nn ln nht, tnh bng kilniutn (kN).

3.5.2 do Marshall ca mu l gi tr bin dng ca vin mu, k hiu l (F), tnh bng mm.

3.5.3 n nh, do Marshall ca BTN l gi tr trung bnh ca ti thiu 3 mu i vi mu c, ca ti thiu 2 mu i vi mu khoan.

Bng 1 - H s hiu chnh n nh Marshall

Chiu cao mu mm

H s hiu chnh K

Chiu cao mu mm

H s hiu chnh K

25,4 5,56 52,4 1,39

27,0 5,00 54,0 1,32

28,6 4,55 55,6 1,25

30,2 4,17 57,2 1,19

31,8 3,85 58,7 1,14

33,3 3,57 60,3 1,09

34,9 3,33 61,9 1,04

36,5 3,03 63,5 1,00

38,1 2,78 65,1 0,96

39,7 2,50 66,7 0,93

41,3 2,27 68,3 0,89

42,9 2,08 69,9 0,86

44,4 1,92 71,4 0,83

46,0 1,79 73,0 0,81

47,6 1,67 74,6 0,78

49,2 1,56 76,2 0,76

50,8 1,47

12

3.6 Bo co th nghim

Bo co th nghim cn c cc thng tin sau:

- Loi mu th nghim: mu ch b hoc mu khoan;

- Chiu cao mu, ghi chnh xc n 0,1 mm;

- n nh Marshall, ghi chnh xc n 0,01 kN;

- do Marshall, ghi chnh xc n 0,1 mm;

- Ngi th nghim v c s th nghim;

- Vin dn tiu chun ny.

4 Xc nh n nh, do Marshall ci tin

Xc nh n nh, do Marshall ci tin tng t nh xc nh n nh, do Marshall c quy nh theo iu 3, ngoi tr mt s iu chnh nh sau:

a) Khun c mu c ng knh trong 152,4 mm 0,2 mm;

b) a tho mu c ng knh 150 mm, chiu dy ti thiu l 20 mm;

c) Trng lng ba m l 10 200 g 10 g, ng knh mt m l 149,4 mm 0,2 mm, chiu cao ri

ca ba l 457 mm 2 mm;

d) Mu tiu chun c chiu cao 95,2 mm. Khi lng m trn c xc nh sao cho mu ca m trn

sau khi m nn c chiu cao 95,2 mm 2,5 mm. Khi lng m trn thng thng l 4 050 g;

e) B phn nn mu gm hai vnh thp mt tr trn bn knh mt trong tip xc vi mu l 76,2 mm

0,2 mm;

f) Hn hp c vo khun c lm 2 lt vi khi lng tng ng nhau, sau mi lt u

dng bay sc 15 ln xung quanh chu vi v 10 ln khu vc gia ci trnh hnh thnh l rng t

ong;

g) S c m tng 1,5 ln so vi th nghim Marshall thng thng (75 c hoc 112 c tng ng vi

50 hoc 75 c ca th nghim Marshall thng thng);

h) i vi mu gia cng t li khoan, ng knh mu khoan nm trong khong 149 mm n 152 mm.

i) Thi gian ngm mu trong b n nhit 60 oC 1 oC l 60 min 5 min;

j) H s iu chnh K trong cng thc (1) c ni suy t Bng 2;

k) Gi tr tiu chun thit k Marshall ci tin v n nh tng 2,25 ln, v do tng 1,5 ln so vi

quy nh ca tiu chun thit k Marshall thng thng.

TCVN 8860-1 : 2011

13

Bng 2 - H s hiu chnh n nh Marshall ci tin

Chiu cao mu mm

H s hiu chnh K

Chiu cao mu mm

H s hiu chnh K

88,9 1,12 96,8 0,97

90,5 1,09 98,4 0,95

92,1 1,06 100,0 0,92

93,7 1,03 101,6 0,90

95,2 1,00

14

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 8860-1:2011

10. Kt qu th nghim:

1 2 3 Trung bnh

H

K

P

F

S

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)

Mu th nghim s:

do Marshall (mm)

n nh Marshall (KN): S = K.P

, ngythng.nm.

Phng th nghim LAS-XD

Tn n v thc hin

Chiu cao mu (mm)

xc nh n nh, do marshall

a ch: Tel/Fax: Email:

H s hiu chnh n nh

Lc nn ln nht (KN)