Cement Sand Bajri Calculator
Ghar banate waqt sabse aam sawaal — chhat ya slab ke liye kitna cement, baalu aur bajri chahiye? Ye calculator aapki jagah ka maap lekar batata hai ki kitni bori cement aur kitne ghanmeter baalu-bajri lagegi. Bina thekedaar ke andaaza kar sakte hain.
Concrete ka hisaab kaise lagta hai
Concrete cement, baalu (sand) aur bajri (aggregate) ke mishran se banta hai. Kitna-kitna lagega ye grade (ratio) par nirbhar karta hai. Aam grade: M15 (1:2:4), M20 (1:1.5:3), M25 (1:1:2). Chhat/slab ke liye aksar M20 istemaal hota hai.
Dry volume = wet volume × 1.54
Har cheez = dry volume × uska ratio ÷ kul ratio
Ek misaal
10 × 10 feet ki chhat, 5 inch moti, M20 (1:1.5:3) grade. Lagbhag: 17 bori cement, ~1.3 m³ baalu, ~2.6 m³ bajri. Isme thoda wastage jodkar rakhein.
Dhyaan dene layak baatein
- Wastage jodein — 5-10% zyada material rakhein, kyunki thoda barbaad hota hai.
- Sariya (steel) alag — ye calculator sirf cement-baalu-bajri ka hai, sariya ka nahi.
- Paani ka anupaat — zyada paani se concrete kamzor. Mistri ki salah lein.
- Grade sahi chunein — chhat ke liye M20 se kam nahi.
Aur nirmaan hisaab
Deewar ke liye eent ka hisaab, ya rang ke liye paint ka hisaab bhi kaam aata hai. Zameen ka maap nikaalna ho to bigha converter aur nali-mutthi converter dekhein.
Grade kaunsa chunein — M15, M20 ya M25
Mistri aksar "1:2:4 daal do" keh deta hai aur baat khatam. Par grade galat chuna to ya to paisa zyada laga, ya chhat kamzor reh gayi. Seedha hisaab ye hai:
- M15 (1:2:4) — sabse patla mix. Chaardiwari ki neev, farsh ke neeche ka PCC, aangan ka bed. Chhat me kabhi nahi.
- M20 (1:1.5:3) — ghar ke kaam ka sabse aam grade. Slab, beam, column, seedhi — ghar ke 90% kaam isi me nikal jaate hain.
- M25 (1:1:2) — jahan wazan zyada padega. Do-teen manzil ka column, paani ki tanki, bade span wali slab.
Ek baat jo dhyaan me rakhni chahiye — M25 me cement M20 se lagbhag 20% zyada lagta hai. 400 sq ft ki 5 inch slab me ye antar takreeban 12-14 bori ka hota hai. Zaroorat na ho to sirf "mazboot rahega" soch kar M25 mat daaliye; paisa jaata hai aur kuch khaas milta nahi.
Ulta bhi utna hi galat hai. Pahadi ilaake me jahan slab par baraf ka wazan aur nami dono aati hai, wahan M15 se slab dalwana baad me daraar ka nyota hai.
Site par jo cheezein hisaab bigaad deti hain
Calculator theoretical number deta hai. Site par asli kharcha teen wajah se badh jaata hai, aur ye teeno pehle se soch kar rakhna behtar hai:
- Bori ka asli wazan. Hisaab 50 kg ki bori par hota hai. Baazaar me kai jagah 45-48 kg ki bori bhi milti hai. Ek baar tolwa lena — 20 bori par 2 bori ka farak nikal aata hai.
- Baalu me nami. Geeli baalu ka volume 20-30% tak phool jaata hai (bulking). Truck se ghar par utri geeli baalu jitni dikhti hai utni hoti nahi. Ek din sukhne dijiye, phir naapiye.
- Bajri ka size. Slab ke liye 20 mm bajri chalti hai. Agar 40 mm daal di to patli slab me theek se baithegi nahi aur beech me khaali jagah reh jayegi.
Aur mix ka paani — jitna kam ho sake utna achha. Zyada paani daalne se concrete aasaani se failta hai par sookhne ke baad taakat girti hai. Mistri "thoda aur paani" maange to ye baat yaad rakhiye.
Kaunsa kaam, kaunsa mix — ek nazar me
Concrete ka anupaat kaam ke hisaab se badalta hai. Galat mix lagane par ya to paisa barbaad hota hai ya dhaancha kamzor.
| Grade | Cement : Baalu : Bajri | Kahan lagta hai |
|---|---|---|
| M7.5 | 1 : 4 : 8 | PCC, farsh ke neeche bharai |
| M15 | 1 : 2 : 4 | Chhoti chardiwari, aam PCC |
| M20 | 1 : 1.5 : 3 | Ghar ki slab, beam, column |
| M25 | 1 : 1 : 2 | Zyada wazan wale column, teen manzil se upar |
Aksar pooche jaane wale sawaal
10x10 chhat me kitna cement lagta hai?
5 inch moti M20 chhat me lagbhag 17 bori (50kg) cement, saath me baalu aur bajri. Wastage jodkar thoda zyada rakhein.
M20 grade kya hota hai?
Cement:baalu:bajri ka 1:1.5:3 anupaat. Chhat aur slab ke liye aam taur par yahi istemaal hota hai.
1 bori cement kitni hoti hai?
Ek bori 50 kg ki hoti hai, jo lagbhag 1.226 cubic feet volume deti hai.
Sariya ka hisaab isme hai?
Nahi, ye calculator sirf cement-baalu-bajri ka hai. Sariya (steel) ka hisaab structure ke design par nirbhar karta hai.
Curing kitne din karni chahiye?
Kam se kam 7 din, aur ho sake to 14 din. Slab par paani na daalne se concrete apni poori taakat kabhi nahi pakadta — ye material bachane se zyada bada nuksan hai.