May tinh the tich be tong

Toi can bao nhieu be tong cho tam ban 10×10?

Tam ban 10×10 foot la mot trong nhung dot do be tong dan dung pho bien nhat — dung cho san hien, nen nha kho va san gara nho. De tinh the tich, nhan chieu dai × chieu rong × chieu sau. Voi tam ban day tieu chuan 4 inch (0,33 ft): 10 × 10 × 0,33 = 33,3 feet khoi, hay khoang 1,23 yard khoi. Tinh theo he met, tuong duong khoang 3,05 × 3,05 × 0,1 = 0,93 met khoi.

Voi khoi luong rieng cua be tong khoang 2.400 kg/m³ (khoang 4.050 lb/yd³), tam ban nay can khoang 2.232 kg (4.920 lb) be tong da tron. Neu ban su dung bao tron san thay vi dat be tong thuong pham, ban se can khoang 90 bao loai 25 kg, 56 bao loai 40 kg, hoac 45 bao loai 50 kg — chua tinh hao hut.

Luon cong them he so hao hut. Voi tam ban hinh chu nhat don gian tren nen da san phang, 5% hao hut thuong la du. Voi tam ban co canh khong deu, nen doc, hoac doi thi cong thieu kinh nghiem, tang len 10-15%. May tinh cua chung toi tu dong ap dung hao hut de ban dat hang dung luong ngay lan dau.

Cach tinh be tong cho mong tron

Mong tron — con goi la mong tru, dem cot, hoac do ong sonotube — pho bien trong xay dung san go, tru hang rao va mong ket cau nhe. Cong thuc the tich la π × r² × chieu sau, trong do r la ban kinh (nua duong kinh). Vi du, mot ong sonotube duong kinh 12 inch (0,3 m) sau 4 feet (1,22 m) chua π × 0,15² × 1,22 = 0,086 m³, hay khoang 207 kg be tong — khoang 9 bao loai 25 kg.

Khi tinh cho nhieu mong, hay tinh the tich cho mot mong roi nhan voi so tru. Dat tong luong lon hon mot chut se hieu qua hon la thieu giua luc do, vi moi noi lam nguoi giua cac lan do se lam yeu lien ket ket cau. Neu ban co 12 mong giong nhau, tinh mot cai roi nhan 12, sau do cong he so hao hut vao tong.

Voi mong hinh chuong hoac mong bac noi day loe rong hon dinh, hay chia hinh dang thanh mot hinh tru cong mot hinh non cut va cong the tich lai. Ngoai ra, ban co the su dung che do hinh thang trong may tinh cua chung toi lam phep xap xi hop ly cho cac hinh dang thu hep.

Nen su dung he so hao hut bao nhieu?

He so hao hut tinh cho luong be tong khong nam trong dot do hoan thien. Cac nguon hao hut bao gom: roi vai trong qua trinh tron va van chuyen, dao qua sau nen (nghia la ho sau hon hoac rong hon du kien), vat lieu con lai trong may tron hoac xe rua, va do qua day van khuon do cong hoac can khong hoan hao.

Huong dan chung: su dung 5% cho tam ban hinh chu nhat don gian, van khuon tot tren nen phang, dam nen voi tho lanh nghe. Su dung 10% (mac dinh trong may tinh) cho cac du an dan dung thong thuong voi van khuon tieu chuan. Su dung 15% cho hinh dang phuc tap, dia hinh doc, dot do tu lam lan dau, hoac khi nen chua duoc chuyen gia chuan bi.

Cac nha cung cap be tong thuong pham thuong khuyen nghi dat them 5-10% so voi the tich tinh toan. Voi be tong bao, lam tron len bao nguyen gan nhat thuong la du — may tinh cua chung toi da ap dung lam tron tran sau khi cong he so hao hut. Thieu luon dat hon co du mot chut, vi mot chuyen giao hang bo sung hoac mot chuyen di them den cua hang lam tang chi phi va co nguy co tao moi noi lam nguoi trong dot do.

Cong thuc the tich tom tat

Hinh chu nhat: The tich = Chieu dai × Chieu rong × Chieu sau. Ap dung cho tam ban, mong, tuong va dam — bat ky hinh dang nao co mat cat hinh chu nhat dong deu.

Hinh tron: The tich = π × (Duong kinh / 2)² × Chieu sau. Dung cho cot tron, ong sonotube, be tru tron va mong tron.

Hinh thang: The tich = ((Rong mat tren + Rong mat duoi) / 2) × Chieu sau × Chieu dai. Ap dung cho tuong vat, lop lot kenh, chan tuong chan va bat ky hinh dang nao co hai canh song song khac chieu rong.

Sau khi tinh the tich thuc, nhan voi khoi luong rieng cua be tong (khoang 2.400 kg/m³ cho be tong trong luong thuong) de co tong khoi luong, sau do chia cho kich co bao da chon va lam tron len de co so bao can. Dung quen tinh he so hao hut truoc khi chia cho kich co bao.