Cau 3: Can bao nhieu voi song co do hoat tinh 92% (8% la hat non lua) de san xuat 1,5m3 voi nhuyen tinh khiet co khoi luong the tich la 1350kg/m3. Biet khoi luong rieng cua hydroxyt Canxi la 2,1g/cm3 va cua nuoc la 1,05 g/cm3. Gia thiet trong voi nhuyen ko co bot khi.

Bai giai:

1,5 m3 voi nhuyen co khoi luong la

1,5x 1350= 2025(kg)

va the tich dac la: Va=1,5 (m3)

Do do co he phuong trinh

VaH2O(m3) + VaCa(OH)2(m3)= 1,5 (m3)

mCa(OH)2 (kg) + mH2O (kg)= 2025 (kg)

↔ mCa(OH)2(kg) + mH2O (kg)= 2025 (kg)

     mCa(OH)2/ ρCa(OH)2+ mH2O/ρH2O =1,5 (m3)

↔ mCa(OH)2(kg) + mH2O (kg)= 2025 (kg);

     mCa(OH)2/ 2100 + mH2O/ 1050 =1,5 (m3)

↔ mCa(OH)2= 900(kg);

    mH2O= 1125(kg)

Luong CaO (voi co hoat tinh 100%) de san xuat 1,5m3 voi nhuyen la

mvoi= 92%. 900. 56/74= 627 (kg)

Cau 1: Phan tich anh huong cua do am den cuong do, khoi luong the tich, do co no the tich cua go?

-Anh huong toi ρwv (hinh ve)

ρwv= Gw/Vw0

Khi vuot qua do am bht thi ρv tang nhanh, Vw0 no? cham.

Khi do am o trong nuoc hap thu thi ρv tang cham, Vw0 no? nhanh

De tien so sanh toan the gioi quy dinh lay do am o 18% cua go la do am tieu chuan. Cac thong so phai qui ve o do am 18%.

ρ18w= ρwv.[1+0,01.(1-K0).(18-w)]

ρwv: khoi luong the tich cua go o W bat ky

k0: he so co

K0= Y0/W

Y0=(V1-V2)/V2. 100%

V1,V2: the tich cua mau truoc va sau khi say.(hinh ve)

Khi thay doi W duoi Wbht thi W go cung thay doi

Khi W↑ thi R↓ nhung khi vuot qua diem bht thi Rgo hau nhu ko thay doi

- Cuong do cua go

Go thuong lam viec trong cac trang thai uon, nen, cat keo

Nen: nen doc tho, nen ngang tho, nen xien tho (hinh ve~)

Rnen= P/F

P: luc tac dung

F: dien tich be mat tac dung

Ruon= M/W

M: momen uong

W: momen chuong uon

Khi tinh toan phai dua ve

R18nd= Rw.[1+α.(W-18)]

α: he so phu thuoc vao chat luong go

Rw= R18nd/ [1+α(W-18)]

Kpc= R18/R18V [(kg/cm2)/(kg/m3)]

Cau 2: The nao la tinh deo hop ly cua hon hop be tong? Phan tich cac yeu to anh huong den tinh deo cua hon hop be tong?