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TCVN T I U C H U N QUC GIA

TCVN 8862:2011

Xut bn ln 1

QUY TRNH TH NGHIM XC NH CNG KO

KHI P CH CA VT LIU HT LIN KT BNG

CC CHT KT DNH

Standard test method for splitting tensile strength of aggregate material

bonded by adhesive binders

H NI-2011

TCVN 8862:2011

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TCVN 8862:2011

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Mc lc

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

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

3 Thut ng v nh ngha................................................................................... 6

4 Tm tt phng php th nghim..................................................................... 7

5 Thit b th nghim ................................................................................... 7

6 Ch b mu th................................................................................................. 9

7 Cch tin hnh.................................................................................................. 9

8 Tnh kt qu...................................................................................................... 10

9 Bo co th nghim ......................................................................................... 11

10 Ph lc A (tham kho): Biu mu bo co kt qu th nghim cng ko

khi p ch...................

12

TCVN 8862:2011

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Li ni u

TCVN 8862:2011 c chuyn i t 22 TCN 73-84 theo quy

nh ti khon 1 iu 69 ca Lut Tiu chun v Quy chun k

thut v im a khon 1 iu 6 Ngh nh s 127/2007/N-CP

ngy 1/8/2007 ca Chnh ph quy nh chi tit thi hnh mt s

iu ca Lut Tiu chun v Quy chun k thut.

TCVN 8862:2011 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.

5

* ang chuyn i thnh TCVN

TIU CHUN QUC GIA TCVN 8862:2011

Quy trnh th nghim xc nh cng ko khi p ch ca vt liu

ht lin kt bng cc cht kt dnh

Standard Test Method for Splitting Tensile Strength of Aggregate Material bonded by Adhesive

Binders

1 Phm vi p dng

1.1 Tiu chun ny quy nh trnh t th nghim xc nh cng ko khi p ch (cn gi l

cng ko gin tip) ca vt liu ht lin kt bng cc cht kt dnh.

1.2 Tiu chun ny p dng cho cc mu th hnh tr c ch b trong phng th nghim hoc cc

li khoan t cc lp mt ng.

1.3 Tiu chun ny p dng ch yu cho cc loi vt liu ht lin kt bng cht kt dnh hu c: b

tng nha; hn hp trn nha; v cho cc vt liu ht lin kt bng cht kt dnh v c: cp phi

dm (hoc cp phi thin nhin) gia c vi xi mng, vi vi; t gia c vi xi mng, vi vi; ct gia

c vi xi mng; b tng xi mng dng ct liu nh, b tng ngho.

i vi b tng nng th p dng tiu chun TCVN 3120:1993 B tng nng-Phng php th cng

ko khi ba.

2 Ti liu vin dn

Cc ti liu vin dn sau l cn thit p dng tiu chun ny. i vi cc ti liu vin dn ghi nm

cng b th p dng bn c nu. i vi cc ti liu vin dn khng ghi nm cng b th p dng

phin bn mi nht, bao gm c cc sa i, b sung (nu c):

TCVN 3105:1993, Hn hp b tng nng v b tng nng - ly mu, ch to v bo dng mu th.

TCVN 3120:1993, B tng nng- Phng php th cng ko khi ba.

TCVN 8860:2011, B tng nha- Phng php th.

TCVN 8858:2011, Mng cp phi dm v cp phi thin nhin gia c xi mng trong kt cu o

ng t - Thi cng v nghim thu.

22 TCN 246-98, Quy trnh thi cng v nghim thu lp ct gia c xi mng trong kt cu o ng t *.

TCVN 8862:2011

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ASTM D6926, Practice for Preparation of Bituminous Specimen Using Marshall Apparatus (Phng

php ch b mu b tng nha bng thit b Marshall).

AASHTO T245, Standard Method of Test for Resistance to Plastic Flow of Bituminous Mixtures Using

Marshall Apparatus (Tiu chun th nghim xc nh cng chng bin dng do ca hn hp b

tng nha bng thit b Marshall).

ASTM C192, Standard Practice for Making and Curing Concrete Test Specimens in the Laboratory

(Tiu chun ch b v bo dng cc mu th b tng trong phng th nghim).

ASTM C42, Standard Test Method for obtaining and Testing Drilled Cores and Sawed Beams of

Concrete (Tiu chun ly mu v th nghim cc li khoan v cc mu dm c ct t b tng).

ASTM D5581, Standard Test Method for Resistance to Plastic Flow of Bituminous Mixtures Using

Marshall Apparatus (6 inch-Diameter Specimen) (Tiu chun th nghim xc nh cng chng

bin dng do ca hn hp b tng nha bng thit b Marshall (mu th ng knh 6 inch).

ASTM D4013, Practice for Preparation of Test Specimens of Bituminous Mixtures by Means of

Gyratory Shear compactor (Quy nh k thut ch b mu hn hp b tng nha bng thit b m

xoay).

ASTM D1632, Standard Practice for making and curing Soil Cement compression and Flexure Test

Specimens in the Laboratory (Tiu chun ch b v bo dng cc mu th nn v un ca t gia c

xi mng trong phng th nghim).

ASTM D5102, Standard Test Method for Unconfined Compressive Strength of Compacted Soil-Lime

Mixtures (Tiu chun th nghim xc nh cng nn khng n hng ca hn hp t gia c vi

m cht).

AASHTO T134, Standard Method of Test for Moisture-Density Relations of Soil-Cement Mixtures (Tiu

chun th nghim xc nh quan h dung trng v m ca hn hp t gia c xi mng ).

3 Thut ng v nh ngha

3.1 Cng ko khi p ch (Splitting tensile strength)

Kh nng chu ko ca mu vt liu khi c mt lc nn tc dng u dc theo ng sinh ca mu

th hnh tr, nm trong mt phng thng ng i qua ng knh ca hai y mu th. Khi lc nn

t n tr s ti a, mu th hnh tr s b ph hy theo mt phng thng ng do ng sut ko pht

sinh vt qu kh nng chu ko ca vt liu mu th.

Cng ko khi p ch thng ln hn cng ko dc trc v nh hn cng ko khi un

ca mu vt liu.

TCVN 8862:2011

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Cng ko khi p ch cn c gi l cng ko gin tip, hoc cng ko khi ba.

4 Tm tt phng php th nghim

Mt ti trng nn tc dng u dc theo ng sinh ca mu th hnh tr, nm trong mt phng thng

ng i qua ng knh ca hai y mu th. Ti trng nn c tng lin tc v u vi tc bin

dng (hoc tc tng ti) quy nh (xem 7.5) cho n khi mu tr b ph hy. Ti trng tng ng vi

trng thi mu b ph hy c ghi li v dng tnh cng ko khi p ch ca vt liu thng qua

cc kch thc ca mu tr.

5 Thit b th nghim

5.1 My nn c kh nng tng ti n ph hy mu (tu kch thc mu v loi vt liu ca mu),

c ng h o lc (hoc vng o lc) v c hp s iu chnh tc nn mu.

5.2 Tm m truyn ti c s dng mt trong cc loi sau tu vt liu c dng cht kt dnh v c

hay hu c:

5.2.1 Tm m truyn ti lm bng g dn nhiu lp, di hn ng sinh ca mu hnh tr khong 1

cm v mi pha, rng (15 2) mm, dy (4 1) mm, c dng cho vt liu dng cht kt dnh v c.

Tm m g khng c cong vnh, khng c khuyt tt, mt tm g phi phng. Hai tm g m

ny ch c dng cho mt ln th (xem hnh 1).

CH DN:

1. Mu th hnh tr

2. Tm m g truyn ti

3. Bn nn di ca my nn

2

4

3

2

1

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4. Bn nn trn ca my nn

Hnh 1. S t mu th hnh tr bng vt liu c dng

cht kt dnh v c vo my nn p ch.

5.2.2 Tm m truyn ti bng thp, mt mt c dng lng mng, c bn knh bng bn knh ca y

mu tr. Chiu rng ca tm m truyn ti bng thp bng (12,70 0,30) mm khi dng cho mu tr

c ng knh 101 mm, v bng (19,05 0,30) mm khi dng cho mu tr c ng knh 152 mm.

Chiu di ca tm m truyn ti di hn ng sinh ca mu tr khong 3 n 5 mm v mi bn.

Tm m loi ny c dng cho vt liu dng cht kt dnh hu c. Mt tm m c t g lp

vo bn nn di v mt tm m c t g lp vo b phn pha trn ca my (xem hnh 2).

a) Tm m truyn ti bng thp g lp vo

bn nn di v bn nn trn ca my nn

b) t mu th hnh tr vo gia 2 tm m

truyn ti bng thp

CH DN:

1. Tm m lng mng bng thp;

2. Mu th hnh tr;

3. Bn nn di;

4. Bn nn trn;

5. Hai tr ng ca my nn.

Hnh 2. S t mu th hnh tr bng vt liu c dng cht kt dnh hu c vo my nn p ch

5.3 Cc thit b, dng c iu chnh v kim tra nhit .

2

5

4

4

12.70 0.30

mm

hoc

19.05 0.30

mm

3

3 1

1

5

1 5

a) b)

Mu hnh tr

ng knh

101 mm

hoc 152

mm

TCVN 8862:2011

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5.3.1 T n nhit bng khng kh hoc b n nhit bng nc t mu th nhit quy nh tu

theo yu cu th nghim.

5.3.2 Nhit k c chnh xc 0,10C.

6 Chun b mu th

6.1 Chun b mu th trong phng th nghim

6.1.1 Chun b mu th hnh tr ca cc vt liu c dng cht kt dnh v c (vi, xi mng) theo mt

trong cc tiu chun TCVN 3105:93 hoc ASTM C192 hoc ASTM D1632 hoc ASTM 5102 hoc

TCVN 8858:2011 tu vt liu l b tng xi mng, cp phi dm (si cui) gia c xi mng hoc vi,

t gia c vi hoc xi mng. Cc mu th hnh tr ny phi c bo dng gi m theo ng quy

nh trong cc tiu chun tng ng cho n khi a vo my nn p ch. ng knh y mu

hnh tr c ch b trong phng th nghim thng dng l 101 mm hoc 152 mm v chiu cao (di)

mu tu quy nh trong cc tiu chun tng ng, nu khng quy nh th ly bng 2 ln ng knh

mu tr.

Mt t mu gm c t nht 3 vin mu.

6.1.2 Chun b mu th hnh tr ca cc vt liu c dng cht kt dnh nha ng, tun theo mt

trong cc tiu chun ASTM D6926 hoc ASTM D5581 hoc ASTM D4013 hoc AASHTO T245 hoc

TCVN 8860:2011 tu theo mu hnh tr ca b tng nha c ch b theo phng php Marshall hay

bng thit b m xoay.

ng knh y mu hnh tr bng 101 mm hoc 152 mm, chiu cao (di) ti thiu ca mu tng

ng bng 50 mm hoc 75 mm.

Mu th hnh tr phi c bo dng trong b nc n nhit (hoc t khng kh n nhit) nhit

xc nh, trong thi gian quy nh ca yu cu th nghim trc khi a vo my nn p ch.

Mt t mu gm c t nht 3 vin mu.

6.2 Mu th l li khoan t cc lp mt ng

Li khoan phi c mt tr phng, hai y li khoan phi song song. Chun b li khoan lm mu th

tun theo tiu chun TCVN 3105:93 hoc ASTM C42 v ASTM C192.

ng knh li khoan l 101 mm khi ng knh ln nht danh nh ca ct liu l 19 mm v l 152

mm khi ng knh ln nht danh nh ca ct liu ln hn 19 mm.

Chiu cao ca li khoan tu theo chiu dy ca lp mt ng nhng khng nh hn 38 mm i vi

li khoan b tng nha ng knh 101 mm v khng nh hn 75 mm i vi li khoan ng knh

152 mm.

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Mi t mu gm c t nht 3 li khoan.

7 Cch tin hnh

7.1 Xc nh din tch thit din chu ko khi p ch ca cc vin mu tr. Trn mu th hnh tr k

khung to bi hai ng sinh v hai ng knh cng nm trn mt mt phng. o chnh xc ti 1mm

cc cp cnh song song vi nhau tng i mt v tnh cc gi tr trung bnh. Din tch chu ko l din

tch ca khung k tnh theo cc gi tr trung bnh ca cc cnh.

7.2 Lm sch b mt tm nn, tm m truyn ti v vin mu cc phn s tip xc nhau khi th

nghim p ch.

7.3 i vi cc mu vt liu c dng cht kt dnh nha ng, khi cn th nghim p ch mt

nhit quy nh no th mu phi c bo dng b n nhit bng nc t nht l 30 min nhng

khng qu 60 min, hoc t n nhit bng khng kh khng t hn 4 h. sai lch nhit cho php

l 10C.

7.4 Mu th hnh tr sau khi bo dng c ly t ln tm m g truyn ti t bn nn di

ca my nn i vi mu vt liu dng cht kt dnh v c (xem 5.2.1 v hnh 1); hoc t dc vo

lng mng ca tm m truyn ti bng thp c g vo bn nn di ca my nn i vi mu

vt liu dng cht kt dnh hu c (xem 5.2.2 v hnh 2). Tng t nh th t tm m truyn ti th

hai ln trn mu th dc theo ng sinh. ng sinh to khung k trn mu tr phi trng vi trc

dc ca tm m truyn ti. i vi mu vt liu c dng cht kt dnh hu c, thi gian thc hin cc

thao tc t khi ly mu ra khi ni bo dng n khi t xong mu vo my nn khng c qu 2

min.

7.5 p ch mu th bng cch tng ti lin tc v u cho n khi mu b ph hy: Tc bin dng

(tc di chuyn bn nn ca my) khi p ch mu vt liu dng cht kt dnh hu c bng (50 5)

mm/min. i vi mu vt liu dng cht kt dnh v c th dng tc tng ti ng sut ko khi p

ch tng u trong khong t 0,10 MPa/min n 0,70 MPa/min t l thun vi cng mu th, sao

cho thi gian ph hu vin mu khng nh hn 30 s. Ghi li ti trng ti a ph hy mu cho tng vin

mu th.

8 Tnh kt qu

8.1 Cng ko khi p ch Rkc ca tng vin mu th hnh tr c tnh chnh xc n 0,01 MPa

theo cng thc:

Rkc= 2 P ;

TCVN 8862:2011

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.H.D

trong : Rkc- Cng ko khi p ch, MPa

P - Ti trng khi ph hy mu hnh tr, N

H - Chiu cao ca mu hnh tr (chiu di ng sinh), mm

D - ng knh y mu hnh tr, mm

- 3,1416

8.2 Cng ko khi p ch ca vt liu l gi tr cng trung bnh ca ba vin trong t mu nu

gi tr ln nht v nh nht khng lch nhau qu 15% so vi gi tr ca vin trung bnh.

Nu mt trong hai gi tr trn lch qu 15% so vi vin trung bnh th loi b c hai gi tr ln nht v

nh nht. Khi cng ko khi p ch c tnh theo gi tr ca vin trung bnh cn li.

9 Bo co th nghim

9.1 Trong bo co th nghim, cn ghi r:

- n v yu cu.

- Tn cng trnh, d n, hng mc p dng.

- Phng th nghim; Ngy th nghim.

- Loi mu ch b trong phng th nghim hay mu l li khoan.

- K hiu tng mu, vt liu ca mu, l trnh khoan li.

- S hp ng hoc vn bn yu cu th nghim.

- Tui mu, trng thi chung ca mu.

- Kch thc mu:

. Chiu cao mu (gi tr trung bnh ca tng mu).

. ng knh mu (gi tr trung bnh ca tng mu).

- Ch bo dng mu trc khi th; b n nhit bng nc hay bng khng kh, nhit bo

dng, thi gian bo dng.

- Nhit th nghim mu.

- Tc bin dng (tc di chuyn bn nn ca my), hoc tc tng ti trng khi p ch.

- Ti trng ph hy mu.

- Cng ko khi p ch Rkc ca tng mu.

- Cng ko khi p ch ca vt liu (gi tr trung bnh ca cc mu trong t mu).

- Ch k ca ngi lm th nghim, phng th nghim v c quan qun l phng th nghim.

9.2 Mu bo co kt qu th nghim: Xem ph lc A

TCVN 8862:2011

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PH LC A

(Tham kho)

Biu mu bo co kt qu th nghim cng ko khi p ch

TN C QUAN QUN L PHNG TH NGHIM

TN PHNG TH NGHIM

a ch phng th nghim

Tel/Fax Phng th nghim

BO CO KT QU TH NGHIM CNG KO KHI P CH

1. n v yu cu:

2. Cng trnh:

3. Ngy nhn mu:

4. Ngun gc mu: Vt liu, loi mu ch b trong phng th nghim hay mu l li khoan, ch bo d-ng mu tr-c khi th; b n nhit bng n-c hay bng khng kh, nhit bo d-ng, thi gian bo d-ng

5. S hp ng hoc vn bn

yu cu th nghim:

6. Tiu chun v thit b th

nghim :

7. Ngy th nghim:

8. iu kin th nghim : Tc bin dng (tc di chuyn bn nn ca my) hoc tc tng ti trng khi p ch

9. Kt qu th nghim :

TT

K

hiu

mu

Tui mu

(gi,ngy)

Nhit

th

nghim

(T, oC)

Kch th-c mu (mm)

Ti trng

ph hy

(P)

C-ng ko

khi p ch

(Rkc)

C-ng ko khi

p ch trung bnh

(RkcTB)

-ng knh (D)

Chiu cao (H)

(N) (N/mm2) (N/mm2)

1

2

3

TCVN 8862:2011

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10. Ghi ch:

11. Nhng ng-i thc hin :

Th nghim : Kim tra :

Tnh ton : T- vn gim st :

.., ngy thng nm

C quan qun l phng th nghim phng th nghim Las xd

(ch k, ghi r h tn, ng du) (ch k, ghi r h tn, ng du)