Cong cu thiet ke cap phoi be tong xac suat
Mien phi. Khong can dang ky. Chay tren trinh duyet.
May tinh the tich
Ban can bao nhieu be tong? Tinh the tich, trong luong va so bao cho cac dot do hinh chu nhat, hinh tron va hinh thang.
May tinh ty le cap phoi
Lay ty le xi mang, cat, cot lieu va nuoc cho mac cuong do muc tieu bang phuong phap thiet ke cap phoi BRE.
Du doan cuong do
Mo phong Monte Carlo cuong do chiu nen 28 ngay. Xem toan bo phan phoi, khong chi mot uoc luong diem.
Toi uu hoa chi phi
Tim cap phoi re nhat dat cuong do muc tieu o muc do tin cay yeu cau. Bao gom gia khu vuc.
Tai sao xac suat?
Be tong thuc te la bien doi. Cuong do ban nhan duoc phu thuoc vao hang chuc yeu to — do chinh xac ty le N/X, bien dong me xi mang, dieu kien bao duong, chat luong cot lieu. May tinh tat dinh chi cho ban mot con so va su tin tuong sai lam. Cong cu cua chung toi chay mo phong Monte Carlo de cho ban thay toan bo phan phoi ket qua co the, giup ban thiet ke voi bien do an toan thuc su can thiet.
Understanding Concrete Mix Design
Thiet ke cap phoi be tong la quy trinh chon ty le xi mang, nuoc, cot lieu min (cat) va cot lieu tho (soi hoac da dam) de dat cuong do chiu nen, do sut va do ben muc tieu. Ty le nuoc-xi mang (ty le N/X) la yeu to quan trong nhat quyet dinh cuong do: ty le thap hon tao ra be tong manh hon, it tham hon, nhung giam do sut.
Cac phuong phap thiet ke cap phoi truyen thong nhu BRE (Vien Nghien cuu Xay dung) va ACI 211 cung cap cong thuc tat dinh — mot bo ty le cho mot mac cuong do nhat dinh. Tuy nhien trong thuc te, cuong do thuc cua be tong thay doi tu me nay sang me khac do bien dong nguyen vat lieu, do chinh xac can, do dong deu tron, thoi gian van chuyen, ky thuat do va dieu kien bao duong.
Thiet ke cap phoi xac suat giai quyet thuc te nay bang cach mo hinh hoa moi dau vao khong chac chan nhu mot phan phoi thay vi mot gia tri co dinh. Mo phong Monte Carlo lay hang ngan mau ngau nhien tu cac phan phoi nay, chay mo hinh cuong do cho tung to hop va tao ra bieu do tan suat cua ket qua co the. Dieu nay cho phep ky su chi dinh cuong do dac trung (gia tri phan vi thu 5 ma 95% me se vuot qua) va muc do tin cay, thay vi dua vao mot uoc tinh tat dinh duy nhat cong them bien do an toan tuy y.
Cau hoi thuong gap
- How much concrete do I need?
- Multiply the length, width, and depth of your pour in metres to get volume in cubic metres. Add 5–10% for waste. Our Volume Calculator handles rectangular, circular, and trapezoidal shapes and converts to bag counts automatically.
- What is the water-to-cement (w/c) ratio?
- The w/c ratio is the mass of water divided by the mass of cement in a concrete mix. It is the single most important factor governing compressive strength: lower ratios produce stronger concrete but reduce workability. Typical structural mixes use w/c ratios between 0.40 and 0.55.
- What is characteristic strength?
- Characteristic strength (fck) is the compressive strength value below which no more than 5% of test results are expected to fall. It accounts for the natural variability of concrete production and is the basis for structural design codes such as Eurocode 2 and IS 456.
- How does curing temperature affect concrete strength?
- Higher curing temperatures accelerate early hydration, increasing 1–7 day strength, but can reduce ultimate 28-day strength due to non-uniform hydration product formation. The Nurse-Saul maturity method models this relationship using a temperature-time factor to predict strength gain at any temperature.
- What is the difference between OPC, PPC, and PSC?
- OPC (Ordinary Portland Cement) is general-purpose cement. PPC (Portland Pozzolana Cement) blends OPC with fly ash for improved durability and lower heat of hydration. PSC (Portland Slag Cement) uses ground granulated blast furnace slag and offers excellent sulfate resistance. Each type affects the rate of strength gain and final strength.