Idn cho ngUdi thp thi cdng IhUc te, ddng thdi dam bao chiit IUdng, lien do cdng trinh; Tinh chdng tham phu thudc riit nhieu vao dai hat (neu dai hat rdng/ deu, ly le kenh hat mjn lang[r]
(1)Gicn thieu I
San xuat xi mang tao vuTa
-Budc dl tat, clon dau cua XI mang But Stfn
KHOINGUYEN
Ciing vdi sff phat trien cua khoa hpc kl thuat, cdng tac ffng dung nhffng Iffu cdng nghe mdi vao thffc lien san xual dien manh me va cd nhffng bffdc dpi pha Viec phal trie'n san phii'm mdi ed linh nang ffu viet, mang linh quyet djnh hieu qua san xuat kinh doanh da va dang dffdc cac doanh nghiep dae biet chu trpng Trffdc thffc le dd, Cdng ty CP Xi mang Biit Sdn (XM Bill Sdn) da chii trpng dau tff phat trien san pham mdi - xi mang ehuyen dung xay trat eao cap - MC25 (cdn goi la xi mang lao vffa)
Ngay san pha'm xi mang tao vffa khdng edn xa la tren the gidi, hay eac nffdc khu vffc My, xi mang chuyen dung xay trat dffdc san xual thed lieu ehuan ASTM - C91 (Masonry cement), vdi ly trpng riit Idn (khoang 25% tdng san Iffdng xi mang) Tuy nhien, tai Viet Nam, ddng san phii'm xi mang ehuyen dung xay dffng, dae biet ddng xi mang ehuyen dung xay trat hau nhff chffa ddn vi nao san xuiit
Xuiit phat Iff nhu eau thj trffdng, nang Iffc ciia ddn vj va trach nhiem xa hpi, XM But Sdn da nghien cffu va trie'n khai san xual ddng san pha'm mdi xi mang chuyen dung xay trat cao cap MC25 Viec lam phii hdp vdi djnh hffdng chung ciia Td'ng edng ly Cdng nghiep Xi mang Viet Nam (Vieem) va cap thiel ddi vdi XM But Sdn Bdi vdi san pha'm mdi, Cdng ty se lang dp phu thj trffdng dap ffng va thda man dffdc phan khue mdi, ngoai phan khue truyen thdng Mat khae, vdi viec da dang hoa san pha'm, Cdng ty se khai thac hieu qua hdn nang Iffc thiet bj, trinh dp, lay nghe va Idng nhiet huyet ciia CBCNV Cdng ly
Trong ITnh vffc xay trat, hoan thien edng trinh (ndi ma ly trpng xi mang thffdng chiem khoang 40-60% long nhu cau xi mSng), rat can chiing loai xi mang cd nhffng dac tinh nd'i troi nhff: tinh deo, tfnh giff nffdc, thdi gian ddng ket hdp ly, tinh chdng tham tdt, hieu qua kinh te eao thuan ldi cho thi
edng thffc le, ddng thdi dam bao chat Iffdng va lien dp Xi mang lao vffa hdi dii nhffng yeu td ma khau hoan thien cdng trinh yeu cau nhff: Xi mang tao vffa deo hdn, dd dffdc nghien mjn, nen kenh hat < 45 micromet chiem ly cao se eho kha nang bam dinh lot, giam that thoat qua trinh xay trat; Do ed dai hat rdng, deu, nen dp ziczac ciia dffdng
mao dan tang dot bie'n, vi vay Iffdng nUdc edn thffa qua trinh thuy hoa se dupc giff lau hdn khdi vffa Khi vffa giff dffdc nffdc, se giam bong trdc, giam sff khd nhanh, nguyen nhan ciia viec "chay" Idp vffa trat - khd lao mat phang va gay ran nut be mat; Thdi gian ddng kel hdp ly hdn, day la mdt thuan ldi
Idn cho ngUdi thp thi cdng IhUc te, ddng thdi dam bao chiit IUdng, lien cdng trinh; Tinh chdng tham phu thudc riit nhieu vao dai hat (neu dai hat rdng/ deu, ly le kenh hat mjn lang, tinh chdng tham se lot), ngoai nd cdn phu thudc vao dp CO ngdt, ran nffl cua vffa (neu vffa ddng kel nhanh/dd giff nffdc kem/ phan cham phan ffng nhieu deu lam giam linh chdng thiim), tiii ca nhffng dieu deu dffdc khac phuc d xi mang lao vffa
Xi mang lao vffa cd hieu qua kinh le cao, thdng thudng thi xi mang chuyen dung xay trat ed gia ban thiip hdn xi mang da dung, m§t khac, dac linh deo hdn, giff nffdc tdt hdn, nen thdi gian thi cdng dffdc rut ng^n va Iffdng vffa that thdat eung dffdc giam Cung dd sff dung Iffdng clinker it
(2)AOI thieu
hdn, dan den giam thieu Iffdng CO2 va tieu hao nang Iffdng cho san xuat clinker nen xi mang dffdc danh gia la than thien mdi trffdng V'e gia ban thi thiip hdn gia PCB30 hien tai 10-15%, khdng nhffng gia canh Iranh ma san xuiit xi mang cdn tiet kiem ehi phf ban dau
Ong Lffdng Quang Khai - Giam ddc Cdng ly cho biet, sau nghien cffu ky tieu ehuan ASTM-C91 (tieu ehuan qudc le) va Tieu chuiin xay dffng Viet Nam -TCXDVN 324:2004; ddi chieu vdi di'eu kien thffc le hien tai, XM But Sdn trffdc mat nghien edu va san xual xi mang chuyen dung xay trat cao ciip theo tieu chuiin Iff cdng bd: TCCS 5.16-2011/BUSOCO (phii hdp vdi lieu ehuan TCXOVN 324:2004); sau liep lue nghien cffu va hoan thien theo ASTM-C91 de cd dii di'eu kien se trien khai ap dung tieu chuiin
Viec xi mang ehuyen dung xay trat eao cifp MC25 ddi la de dap ffng mpl phan khue rieng, cd tiem nang Idn, ma hien eac doanh nghiep san xual xi mang edn de ngd Oen thdi die'm nay, he thdng eua Vieem ehi ed Ha Tien, But Sdn va mpt ddn vj khae la Holeim nghien edu san xuiit loai xi mang Dff kien thang cudi nam 2011, XM Biit Sdn se dda thi trudng khoang tren 200 nghin tiin Ong Khai eho biet them, Cdng ty nghien cffu riil ky Iffdng, sau ban hang thff nghiem mdi tung thj trffdng, bdi viec ban hang canh tranh dang la van d'e ndng ciia cae doanh nghiep, khong rieng gl san xual xi mang Nham dffa san phii'm mdi thj trffdng, Xi mang But Sdn da nghien cffu, khao sat va nhan thiiy lai thi trffdng khdi dan sinh thi hieu ciia da sd la thich re, b'en, cd ngffdi van chffa nhan thffc het vai trd quan trpng ciia viec diing xi mang tao vffa xay trat, vi vay, XM Bill Sdn da va dang sff dung thi trffdng truy'en thdng de tuyen truy'en v'e san phii'm mdi eiia minh
Trong xu the hpi nhap va phal trie'n, van d'e nang eao chat Iffdng cac edng trinh xay dffng d nffdc la cang dffdc dat mpt each nghiem tuc va cap thiet Cdng ty CP Xi mang Bill Sdn da xae djnh, tiep tue nghien cffu phal trie'n cac san pha'm mdi, dap dng nhu cau phat trie'n eiia thj trffdng xay dffng Viet Nam, gdp phan vao sff nghiep CNH, HOH diit nffdc.•
va van de xuT ly
nirdc ri rac d Ha Noi
YENTUYET
Cach day hon 10 nam, Ha Noi chUa mo rong pho, Khu lien hop chat thai Nam Son rpng hon 83 n^m tren dja ban huyen Soc Son, each trung tam Ha Noi 65 km da dupc xay dung Thdi diem do, lupng rac trung binh mpt dUpc dtia toi Nam SPn de chon lap chi khoang 1.200 tan, nhUng den nay, lUpng rac hdng ngay da vUpt hOn 4.200 tan
Nam Sdn la bai chdn lap rae dffdc thiel ke, xay dffng, van hanh va kie'm soat chdn lap theo dung quy pham eua Bp Xay ddng va quy che quan ly eiia Bp Y le Vdi d chdn, liip rae rdng ha, dao sau 9m so vdi mat dddng, dffdc dam nen dung tieu chua'n ky thuat nhff nhffng cai be khdng Id neu cd chffa nffdc eung han che thiim xudng diit lam anh hffdng ldi mdi trddng Od la chffa ke day eae hd chdn rae dffdc trai mdl Idp vai dja ky Ihual, tren phu mdt Idp dat set day nffa met dffdc dam, gal phang va tren cung la Idp eat, sdi nham Ipc ky hdn nddc ri rae trffdc chay hd Iffu chffa
Hien nay, ngoai bai rac Nam Sdn, Ha Npi cdn cd bai rac Xuan Sdn (lai phd Sdn Tiiy) va cac bai rac nhd nhff: Ta Thanh Oai, Kieu Ky, Hffu Bang, Nui Thoong Trdng td'ng sd khoang 6.000 liin rac thai sinh hoat thu gom tren dja ban Ha Ndi moi ngay, bai rae Nam Sdn chdn lap khoang 4-5.000 liin, lam cho quy dat chdn lap phai thu hep dan, cd kha nang hel nam 2012 khdng edn dien tieh chffa rae Hien lai, bai rae Nam Sdn ehi edn lai chffa day ha, mac du eae hd chdn lap rac da tien hanh cdt nen va chat rae cao len 35m so vdi mat diit
Cai khd cua viec chdn lap rae hdp ve sinh khdng ehi la ton quy dat ma cdn dat van de xff ly nffdc ri rae Iranh gay d nhiem mdi trffdng Cff 10 tan rac dffdc chdn liip, khdng bj tham nffdc mffa moi dem se ri m^ nffdc