1

n

1. P P P A TH (TCVN 7570 : 2006)

Kch thc l sng (mm)

2,5 1,25 0,63 0,315 0,14 Lt qua

sng 0,14

Lng st tch lu Ai (%)

0 - 20 15 - 45 35 - 70 70 - 90 90 - 100 0 - 10

2. P P P A (S ) (TCVN 7570 : 2006)

Lng st tch ly trn sng, % khi lng, ng vi kch thc ht liu nh nht v ln nht, mm

Kch thc l sng (mm)

5-10 5-20 5-40 5-70 10-40 10-70 20-70

100 - - - 0 - 0 0

70 - - 0 0-10 0 0-10 0-10

40 - 0 0-10 40-70 0-10 40-70 40-70

20 0 0-10 40-70 ... 40-70 ... 90-100

10 0-10 40-70 ... ... 90-100 90-100 -

5 90-100 90-100 90-100 90-100 - - -

3. P O EO (TCVN 1770:1986)

Loi ct Ct to Ct va Ct nh Ct rt nh

Mk 2,5 3,3 1,0 2,5 1,0 2,0 0,7 1,0

4. P O ST NUNG (TCVN 1451:1998)

Mc gch Cng chu nn, kG/cm2 Cng chu un, kG/cm2 ht nc,

2

Trung bnh

cho 5 mu th

Nh nht cho 1 mu th

Trung bnh

cho 5 mu th

Nh nht cho 1 mu th

%

200 200 150 34 17 16

150 150 100 28 14 16

125 125 100 25 12 16

100 100 75 22 11 16

75 75 50 18 9 16

50 50 35 16 8 16

NG 5. P O EO P P P ( 2682:2009)

Mc xi mng Cng nn, kG/cm2

3 ngy 45 min 28 ngy 8 h

PC30 160 300 PC40 210 400 PC50 250 500

NG 6. S (TCVN 3118: 1993)

(ly khun 15 x 15 x 15 cm lm chun)

Hnh dng v kch thc ca mu, mm H s tnh i

Mu lp phng

100 100 100 0,91

150 150 150 1,00

200 200 200 1,05

300 300 300 1,10

Mu tr (dh)

71,4 143 v 100 200 1,16

150 300 1,20

200 400 1,24

NG 7. A O O P

Loi kt cu Phng php thi cng

C gii Th cng

3

SN, cm t, s SN, cm

B tng nn mng cng trnh 1 - 2 25 - 35 2 - 3

B tng khi ln t hay khng ct thp 2 - 4 15 - 25 3 - 6

Bn, dm, ct, lanh t, vng... 4 - 6 12 - 15 6 - 8

B tng c hm lng ct thp trung bnh 6 - 8 10 - 12 8 - 12

B tng c hm lng ct thp dy 8 - 12 5 - 10 12 - 15

B tng trong nc 12 - 18 < 5 -

B tng xi mng mt ng 1 - 4 25 - 35 2 - 6

8. A P

Loi hn hp b tng

cng (s) Loi hn hp

b tng SN (cm) cng (s)

c bit cng 300 t do 1 - 4 20 - 15

Cng rn 250 - 200 Do 5 - 8 10 - 0

Cng 80 - 100 Rt do 10 - 12 -

Cng va 30 - 45 Chy 15 - 18 -

NG 9. S A 1 3 B TNG ( lt )

do yu cu Khi si c Dmax l (mm) Khi dm c Dmax l (mm)

SN (cm) t (s) 10 20 40 80 10 20 40 80

9 - 12 < 5 215 200 185 170 230 215 200 185

6 - 8 5 - 10 205 190 175 160 220 205 190 175

3 - 5 10 - 15 195 180 165 150 210 195 180 165

1 - 2 15 - 30 185 170 155 140 200 185 170 155

- 30 - 50 165 160 150 - 175 170 160 -

- 50 - 80 155 150 140 - 165 160 150 -

- 80 - 120 145 140 135 - 160 155 140 -

- 120 - 200 135 130 128 - 150 145 135 -

Ghi ch:

- Bng ny tra vi ct c Nyc = 7%. Khi ct c Nyc tng, gim 1% th lng nc tng, gim 5 lt.

- Nu xi mng c ph gia v c hot tnh (pudlan-x qung) lng nc tng 15-20 lt..

4

- Khi lng xi mng dng ti 450-500 kg/m3 b tng th c mi 100kg xi mng cng thm 10 lt nc.

1 . A O P P

Tnh cht mi trng B tng ct thp B tng thng

Kt cu c mi che 0,75 -

Kt cu chu ma gi 0,65 -

Kt cu ngp nc 0,65 0,75

Kt cu b n m n mnh 0,50 0,65

B tng trong nc - 0,50

NG 11. O P P ( kg/m3 b tng )

iu kin lm vic

ca cng trnh

Phng php to hnh

Th cng C gii

Trc tip vi mi trng nc 265 240

B nh hng ca ma gi 250 220

Khng b nh hng ca ma gi 220 200

NG 12. S A A1

c trng

ca ct liu

A A1

1 X/N 2,5 2,5 < X/N < 3,3

Phng php mm Phng php mm

Cht lng cao 0,65 0,43

Cht lng trung bnh 0,60 0,40

Cht lng thp 0,55 0,37

NG 13. A S (KD)

Lng xi mng

trong 1m3 b tng (kg)

H s

dm Cui si

250 1,30 1,34

300 1,36 1,42

350 1,42 1,48

5

400 1,47 1,52

Ghi ch: Gi tr trong bng tra dng vi ct ht trung bnh

(lng nc yu cu ca ct l 7% theo khi lng).

- Khi dng ct ht nh ng vi lng nc yu cu ln hn 7% th gi tr gim i 0,03 ng vi tng mi 1% lng nc yu cu ca ct.

- Ngc li nu dng ct ht ln th tng ln 0,03 ng vi mi 1% lng nc yu cu ca ct.

Nguyn t lng ca mt s nguyn t:

Ca = 40 Si = 28 Fe = 56 Al = 27

O = 16 H = 1 C = 12 S = 32