TCVN 1771-1987- Cat Da Dam Soi Dung Trong Xay Dung
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Transcript of TCVN 1771-1987- Cat Da Dam Soi Dung Trong Xay Dung
TCXDVN
TIU CHUN vit nam tcvn 1771 - 1987
TIU CHUN vit nam tcvn 1771 - 1987
dm si v si dm dng trong xy dng - Yu cu k thut Tiu chun ny thay th cho TCVN 1771 : 1975
Tiu chun ny quy nh yu cu k thut cho dm p t thin nhin ( dm), v si dm p t cui (si dm) dng trong xy dng .
Tu theo mc ch s dng , dm, si v si dm phi ph hp vi yu cu k thut ring i vi mi loi cng tc xy dng
1. Yu cu k thut 1.1. Si dm phi cha cc ht p v vi s lng khng nh hn 80 % theo khi lng.
Ch thch :Ht p v l ht m din tch mt v ca n ln hn mt na tng din tch b mt ca ht v . 1.2. Tu theo ln ca ht, dm, si v si dm c phn ra cc c ht sau : 5 n 10 mm ; ln hn 10 n 20 mm ; ln hn 20 n 40 mm ; ln hn 40 n 70 mm .
Ch thch : Theo s tho thun gia cc bn c th cung cp dm, si v si dm c c ht t 310 mm; 10 15 mm; 25 40 mm v c ht ln hn 70 mm. Theo s tho thun gia cc bn, cho php cung cp dm, si v si dm dng hn hp hai hoc hn hai c ht tip gip nhau. 1.3. Thnh phn ht ca mi c ht hoc hn hp vi c ht phi c ng biu din thnh phn ht nm trong vng xin ca biu hnh 1.
Ch thch :i vi c ht 5 n 10 mm cho php cha ht c kch thc di 5 mm ti 15%. 1.4. Tu theo cng dng dm, si v si dm cn c ch tiu bn c hc sau y:Dng cho b tng : nn p trong xi lanh:Dng cho xy dng ng t : nn p trong xi lanh, mi mn trong tang quay.Dng cho lp m ca ng st : chng va p trn my th va p "IIM".
1.5. Tu theo nn p trong xi lanh, mc ca dm t thin nhin c chia thnh 8 mc v xc nh theo bng 1.
1.6. Mc ca dm t thin nhin xc nh theo nn p trong xi lanh (105 N/m2) phi cao hn mc b tng.
Khng di 1,5 ln i vi b tng mc di 300 ;
Khng di 2 ln, i vi b tng mc di 300 v trn 300 ;
dm t phn xut trong mi trng hp phi c mc khng nh hn 800.
dm t bin cht : khng nh hn 600.
dm t trm tch : khng nh hn 100.
Ch thch : Cho php dng dm t cacbnat mc 400 i vi b tng mc 300, nu hm lng ht mm yu trong khng qu 5%.
Bng 1
1.7. Mc ca si v si dm theo nn p trong xi lanh dng cho b tng mc khc nhau, cn ph hp vi yu cu chung ca bng 2.
Bng 2
1.8. Theo mi mn trong tang quay dm, si v si dm c phn ra 4 mc , tng ng vi bng 3.
Bng 3
1.9. Theo chng va p khi th nghim trn my th va p " II.M " dm, si v si dm c phn ra 3 mc tng ng vi bng 4.
Bng 4
1.10. Hm lng ht thoi dt trong dm, si v si dm khng c vt qu 35% theo khi lng .
Ch thch : Ht thoi dt v ht c chiu rng hay chiu dy nh hn , hay bng 1/3 chiu di. 1.11. Hm lng ht mm yu v phong ho trong dm, si v si dm khng c ln hn 10% theo khi lng.
Ch thch: 1) Ht dm mm y l cc ht dm gc trm tch hay loi phn xut, c gii hn bn khi nn trng thi bo ho nc , nh hn 200.105 N/m2. dm phong ho l cc ht dm gc phn xut c gii hn bn khi nn trng thi bo ho nc, nh hn 800.105 N/m2, hoc l cc ht dm c gc bin cht c gii hn bn khi nn trng thi bo ho nc, nh hn 400.105 N/m2;
2) dm mc 200 v 300 cho php c cha ht mm yu n 15% theo khi lng ;
3) Si lm lp m ng st cho php c cha ht mm yu n 15%theo khi lng. 1.12. Hm lng tp cht sunlft v sulfit (tnh theo SO3) dm, si v si dm khng c qu 1% theo khi lng .
1.13. Hm lng silic xyt v nh hnh trong dm, si v si dm xc dng lm ct liu cho b tng nng, thng thng khng c qu 50 milimol/100 ml NaOH.
1.14. Hm lng ht st, bn, bi trong dm, si v si dm xc nh bng cch ra khng c qu tr s ghi bng 5 ; trong cc st khng qa 0,25%. Khng cho php c mng st bao ph cc ht dm ,si v si dm v cc tp cht bn khc nh g mc , l cy , rc ri... ln vo.
Bng 5
1.15. Tp cht hu c trong si, si dm dng lm ct liu cho b tng khi th nghim bng phng php so mu khng c m hn mu chun.
2. Quy tc nghim thu2.1. Trc khi xut xng, dm, si v si dm phi c b phn KCS ca c s nghim thu v cht lng theo l. S lng ca mi l nghim thu l 300 tn (hoc 200m2) cho dm, si v si dm ca mt c ht hoc hn hp mt vi c c cng cp cht lng. S lng nh hn 300 tn (hoc 200m2) cng c xem nh l .
2.2. T mi l nghim thu s tin hnh ly mu trung bnh theo TCVN 1772 : 1987 kim tra cc ch tiu 1.2 ; 1.10 ; 1.11; v 1.14 ca tiu chun ny.
2.3. iu kin chp nhn l l cc kt qu kim tra ph hp vi mc cht lng nu trong ch tiu kim tra quy nh iu 2.2 hoc m bo yu cu ca hp ng vi khch hng.Nhng l b loi phi c tin hnh x l v nghim thu li.
3. Phng php th 3.1. Mu th ly theo TCVN 1772 :1987.
3.2. Hm lng sun pht, sunpht tnh ra SO3 c xc nh theo TCVN 141 : 1986.
3.3. Cc ch tiu khc c xc nh theo TCVN 1772 :1987
4. Vn chuyn v bo qun 4.1. Khi xut xng, c s sn xut phi c giy chng nhn cht lng ca mi l cho khch hng, trong ghi r :
Tn c s sn xut si ;
Tn , si ;
S th t ca l, thi gian sn xut ;
Kt qu ca ch tiu cht lng kim tra iu 2.2 ;
S hiu ca tiu chun ny v s hiu ca tiu chun dng th nghim si ;
Ch k hiu ca trng KCS c s sn xut.
4.2. Khi vn chuyn hay bo qun bi (hoc kho cha) xm. si v si dm cn c ring theotng c ht, trnh lm bn cc tp cht khc.
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