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TCVN T I U C H U N Q U C G I A
TCVN 8860-10 : 2011
Xut bn ln 1
B TNG NHA - PHNG PHP TH - PHN 10: XC NH RNG CT LIU
Asphalt Concrete Test methods
Part 10: Determination of Voids in Mineral Aggregate
H NI - 2011
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TCVN 8860-10 : 2011
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TCVN 8860-10 : 2011
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TCVN 8860-10 : 2011
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Mc lc
1 Phm vi p dng
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5
2 Ti liu vin dn
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5
3 Thut ng v nh ngha
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5
4 Xc nh rng ct liu
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TCVN 8860-10 : 2011
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Li ni u
TCVN 8860-10 : 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 8860-10 : 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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TCVN 8860-10 : 2011
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T I U C H U N Q U C G I A TCVN 8860-10 : 2011
B tng nha - Phng php th -
Phn 10: Xc nh rng ct liu
Asphalt Concrete - Test methods -
Part 10: Determination of Voids in Mineral Aggregate
1 Phm vi p dng
rng ct liu c s dng trong tnh ton thit k v kim sot cht lng b tng
nha (BTN).
2 Ti liu vin dn
Cc ti liu vin dn sau rt cn thit cho vic p dng tiu chun ny. i vi
cc ti liu vin dn ghi nm
ban hnh th p dng bn c nu. i vi cc ti liu vin dn khng ghi nm ban
hnh th p dng phin
bn mi nht, bao gm c cc sa i (nu c).
TCVN 4195-95, Phng php th nghim xc nh khi lng ring ca t trong
phng th nghim.
TCVN 8860-1:2011, B tng nha Phng php th - Phn 1: Xc nh n nh, do
Marshall.
TCVN 8860-5:2011, B tng nha Phng php th - Phn 5: Xc nh t trng
khi, khi lng th tch
ca b tng nha m nn.
AASHTO T85, Standard Method of Test for Specific Gravity and
Absorption of Coarse Aggregate (Phng
php xc nh t trng v ht nc ca ct liu th).
AASHTO T84, Standard Method of Test for Specific Gravity and
Absorption of Fine Aggregate (Phng php
xc nh t trng v ht nc ca ct liu nh).
3 Thut ng v nh ngha
Trong tiu chun ny s dng thut ng v nh ngha sau:
rng ct liu (Voids in Mineral Aggregate)
Khong trng gia cc ht ct liu trong hn hp BTN m nn, c tnh bng t l
phn trm (%) tng
th tch mu.
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TCVN 8860-10 : 2011
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4 Xc nh rng ct liu
4.1 rng ct liu ca b tng nha (VMA), tnh bng t l phn trm, chnh xc
ti 0,1 %, theo cng thc:
sb
smb
G
PGVMA 100 (1)
trong :
Ps l hm lng ct liu, tnh theo khi lng hn hp BTN, %;
Gmb l t trng khi ca mu BTN m nn, khng th nguyn;
Gsb l t trng ca hn hp ct liu, khng th nguyn.
4.2 Xc nh t trng khi ca mu BTN m nn (Gmb): theo TCVN 8860-5 :
2011
Vi mi hm lng nha, c 3 mu Marshall theo TCVN 8860-1 : 2011. Xc nh
t trng khi ca BTN
theo quy nh ti TCVN 8860-5 : 2011.
4.3 Xc nh t trng ca hn hp ct liu
Hn hp ct liu s dng lm BTN bao gm cc loi ct liu th ( dm), ct liu
nh (ct), bt
khong c t l phi trn xc nh. T trng khi ca hn hp ct liu ( sb) c
tnh theo cng thc sau:
n
n
nsb
G
P
G
P
G
P
PPP
...
....
2
2
1
1
21 (2)
trong :
P1, P2,.., Pn l t l % ca cc loi ct liu, bt khong c trong hn hp
ct liu;
G1, G2,.., Gn l t trng ca ca tng loi ct liu: dm, ct, bt khong c
trong hn hp ct liu, tnh tnh bng gam trn centimt khi (g/cm3). T trng
ca dm c xc nh theo AASHTO T 85, t trng ca ct c xc nh theo nh theo
AASHTO T 84, t trng ca bt khong c xc nh theo TCVN 4195-95.
