TCVN 8860-7 Xac Dinh Do Goc Canh Cua Cat

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

TCVN 8860-7 : 2011

Xut bn ln 1

B TNG NHA - PHNG PHP TH - PHN 7: XC NH GC CNH CA CT

Asphalt Concrete Test methods

Part 7: Determination of Fine Aggregate Angularity

H NI - 2011

TCVN 8860-7 : 2011

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TCVN 8860-7 : 2011

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TCVN 8860-7 : 2011

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Mc lc

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

2 Ti liu vin dn ...................................................................................................................... 5

3 Thut ng v nh ngha ........................................................................................................ 5

4 Nguyn tc............................................................................................................................... 5

5 Thit b, dng c ..................................................................................................................... 6

6 Hiu chun ng ong .............................................................................................................. 7

7 Chun b mu .......................................................................................................................... 7

8 Cch tin hnh ........................................................................................................................ 8

9 Biu th kt qu ....................................................................................................................... 8

10 Bo co th nghim ............................................................................................................... 9

Ph lc A (Tham kho): Mu bo co kt qu th nghim ..................................................... 10

TCVN 8860-7 : 2011

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Li ni u

TCVN 8860-7 : 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 8860-7 : 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

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T I U C H U N Q U C G I A TCVN 8860-7 : 2011

B tng nha - Phng php th -

Phn 7: Xc nh gc cnh ca ct

Asphalt Concrete - Test methods -

Part 7: Determination of Fine Aggregate Angularity

1 Phm vi p dng

Tiu chun ny quy nh phng php xc nh gc cnh ca ct (ct thin nhin, ct xay, hn hp ct

thin nhin v ct xay) trng thi ri.

2 Ti liu vin dn

TCVN 7572-4 : 2006, Ct liu cho b tng v va - Phng php th - Phn 4: Xc nh khi lng ring, khi lng th tch v ht nc.

3. Thut ng v nh ngha

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

gc cnh ca ct (Fine Aggregate Angularity)

Ch tiu tng hp nhm nh gi hnh dng v trng thi b mt ca ct liu mn (ct). Ht ct liu c dng

hnh khi, b mt th rp vi nhiu gc cnh s c gc cnh ln hn so vi ht ct liu trn cnh v c b

mt trn nhn. gc cnh ca ct c xc nh qua rng ca cp phi ct (c thnh phn ht quy

nh) trng thi khng m nn, rng cng cao th gc cnh cng ln. S dng ct c gc cnh

ln trong ch to b tng nha s to nn mt ng b tng nha m bo kh nng khng ct, chng

trt v hn ch vt hn ln bnh xe.

4 Nguyn tc

4.1 Mu ct ng trong phu c chy xung mt ng ong c th tch 100 mL vi chiu cao ri quy nh.

Gt b phn ct liu tha trn ming ng ong, sau xc nh khi lng ct liu c trong ng ong bng

cch cn. rng ct s c tnh bng cch ly th tch ng ong tr i th tch tuyt i ca ct liu. Th

tch tuyt i ca ct s c tnh trn c s khi lng ct liu trong ng ong v khi lng ring ca ct.

rng ct l gi tr trung bnh ca 2 ln th nghim.

4.2 Mu ct dng th nghim rng l mu c thnh phn cp phi chun v khi lng quy nh. Mu

c phn tch thnh nhiu c ht khc nhau c kch c quy nh, sau li c trn vi nhau theo mt t

l nht nh to thnh mu nghim.

TCVN 8860-7 : 2011

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5 Thit b, dng c

5.1 ng ong: c lm bng thp hoc bng ng, c th tch khong 100 mL, ng knh trong khong

39 mm v chiu cao khong 86 mm. y ng dy t nht l 6 mm, mt di ca y ng c mt ch lm

gia tm dng nh v ng trong gi (xem Hnh 1).

Kch thc tnh bng milimt

Hnh 1- ng ong chun, dung tch 100 ml

5.2 Phu: c lm bng thp hoc ng, b mt trong ca phu phi phng. Phu cao t nht 38 mm,

thnh phu c gc nghing 600 40 so vi trc ca phu. Kch thc l y phu l 12,7 mm 0,6 mm.

Pha trn phu c gn vi 1 vnh kim loi c th tch t nht l 200 mL (xem Hnh 2).

Hnh 2 - B dng c th nghim

TCVN 8860-7 : 2011

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5.3 Gi : bng kim loi, c 3 chn hoc 4 chn, c kh nng gi phu cha ct liu n nh trn gi. Trc

ca phu trng vi trc ca ng ong vi sai s v gc (ca 2 ng trc) phi nh hn 40 v sai s v

khong cch nh hn 2 mm.

5.4 Tm knh: c kch thc 60 mm x 60 mm v c chiu dy ti thiu l 4 mm dng hiu chun ng

ong.

5.5 Khay: lm bng kim loi, bn v phng ng ton b gi khi th nghim, dng thu hi mu

ct liu chy trn trn ng ong khi rt v khi gt phng ng ong.

5.6 Dao gt bng thp, c chiu di khong 100 mm, chiu rng t nht 20 mm v phi c 1 cnh thng dng

gt phn mu tha trn ng ong.

5.7 Cn c kh nng cn c khi lng ca ng ong cha y mu ct vi chnh xc 0,1 g.

6 Hiu chun ng ong

6.1 Bi mt lp m bi trn mng ln ming ca ng ong. Cn xc nh khi lng ca ng ong ( bi

m) v tm knh. y ng ong bng nc kh ion v un si, c nhit t 18 oC n 24 oC. Ghi

li nhit ca nc. Ly tm knh t ln ming ng ong nhng ch khng to ra bt kh di mt knh.

Lau kh pha ngoi ng ong, cn xc nh khi lng ca ng ong y nc v tm knh. Lau sch

m bi trn trn ming ng ong.

6.2 Th tch ca ng ong (V), tnh bng mililt (mL), chnh xc n 0,1 mL, theo cng thc sau:

V = D

M (1)

trong :

M Khi lng ca nc, tnh bng gam (g);

D Khi lng ring ca nc ca nc ti nhit th nghim, tnh bng gam trn centimt khi (g/cm3)

6.3 Nu nh kt qu hiu chun cho thy th tch ca ng ong ln hn 100 mL th mi mt cho ng ong

ngn li a th tch ng ong v ng bng 100 mL.

7 Chun b mu

7.1 Ra mu qua sng 0,15 mm, sau sy kh ri sng mu thnh cc nhm ht ring bit c kch c theo

quy nh Bng 1. ring mi nhm ht trong mt khay.

7.2 Cn cc nhm ht theo khi lng quy nh ti Bng 1 vi sai s 0,2 g. Trn cc nhm ht c

mu c khi lng 190 g.

TCVN 8860-7 : 2011

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Bng 1- Cp phi tiu chun ca ct

Nhm ht Khi lng

g

Lt sng 2,36 mm, trn sng 1,18 mm 44




Tng khi lng mu 190

8 Cch tin hnh

8.1 Ly dao trn u mu chun b. Lp phu v ng ong vo ng v tr trn gi . Ly ngn tay bt l

y phu. mu vo phu, ly dao lm phng mu trong bnh. B tay khi l y phu cho ct liu

chy t do t phu xung ng ong.

8.2 Sau khi mu chy ht, ly cnh thng ca dao gt phn ct liu tha trn ming ng ong. Trnh

khng c to ra rung ng hoc tc ng mnh vo ng lm cho ct liu trong ng ong b cht li. Ly

chi lng qut cc ht ct liu cn bm pha ngoi ng ong. Cn xc nh khi lng ca ng ong v ct

liu chnh xc n 0,1 g.

8.3 mu trong ng ong vo phn mu trong khay, trn u mu v lp li cc thao tc m t t 8.1 n

8.2 lm th nghim ln 2.

8.4 Ghi li khi lng ca ng ong v khi lng ng ong cha y mu cho mi ln th nghim, chnh

xc n 0,1 g.

9 Biu th kt qu

9.1 gc cnh ca ct (U), tnh bng phn trm (%), chnh xc ti 0,1 %, theo cng thc:

100)/(

xV

FVU a

(2)

trong :

V Th tch ca ng ong, tnh bng mililt (mL);

F Khi lng ca ca ct liu trong ng ong, tnh bng gam (g);

a Khi lng ring ca ct, tnh bng gam trn centimt khi (g/cm3), xc nh theo

TCVN 7572-4 : 2006

9.2 Kt qu th gc cnh ca ct l gi tr trung bnh cng ca 2 ln th, chnh xc n 0,1 %.

TCVN 8860-7 : 2011

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10 Bo co th nghim

Bo co th nghim cn c nhng thng tin sau:

- Ngun gc ct liu;

- Khi lng ring ca ct;

- gc cnh ca ct;

- Ngi th nghim v c s th nghim;

- Vin dn tiu chun ny.

TCVN 8860-7 : 2011

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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 8860-7 : 2011

10. Kt qu th nghim:

1 2 Trung bnh

a

V

F

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)

Phng th nghim LAS-XD

Mu th nghim s:

a ch: Tel/Fax: Email:

, ngythng.nm.

gc cnh ca ct (%):

Tn n v thc hin

Khi l-ng ring ca ct (g/cm3)

Th tch ng ong (mL)

Khi l-ng ca ct trong ng ong (g)

kt qu th nghim gc cnh ca ct

100)/(x

V

FVU a

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TCVN 8860-7 Xac Dinh Do Goc Canh Cua Cat