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**Quantity calculation of concrete for DPC and what is DPC** and how much cement sand and aggregate required for 50 square metre DPC work.

### ◆ **what is DPC**:- generally DPC damp proof course or damp proofing course is **barrier** between superstructure of building and ground structure of building which prevent moisture from ground soil due to capillary action that is called rising pump. and DPC put on wall and on floor to prevent from moisture and it is used at basement which restrict the movement of moisture from ground soil to Brick wall and floor surface.

### * **introduction**:- in this topic we calculate quantity of cement sand and aggregate required for 50 square metre DPC work.

### ◆** what is admixture of concrete its types and its properties**

### * **thickness of DPC:-** generally thickness of DPC concrete it is about 40 mm 50 mm. And sand which are used coarse sand and smaller size of aggregate.

### ***(1Q) quantity calculation of concrete for DPC of 50 square metre area:**–

### ***Solve**:-

Area =50 m2, thickness= 40 mm=0.04m

### Wet volume =area× thickness

Wet volume = 50m2×0.04m =2m3

### For the calculation of dry volume 33% volume is increased so we should multiply cofactor 1.33 in wet volume.

**Dry volume =**1.33×2 m3 =2.66 m3

### ***mix ratio:-** we have use mix ratio of cement sand and aggregate is **1:2:4** in which 1 part cement 2 part sand and 4 part aggregate. And total proportion=1+2+4=7

### (1) **quantity calculation of cement in number of bags;-**

### Density of cement=1440 kg/m3

Weight of 1 bag cement=50 kg

### Weight=volume×density

### Number of bag of cement=(1×2.66×1440)/(7×50) =10.944 bags

### Number of bag of cement = 11 bags (approx)

### (2) **quantity of sand:-**

### 1m3 =35.3147cft

### Volume of sand =2×2.66×35.3147/7 cft

Volume of sand =26.839 cft

### (3) **quantity of aggregate:-**

### Volume of aggregate=4×2.66×35.3147/7

Volume of aggregate=53.678 cft

**●Results**:- for DPC work of 50 square feet area we have required following material:-

### 1) number of bag of cement =11 bags

2) volume of sand in CFT=26.839 cft

3) volume of aggregate=53.678 cft

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Area =50 m2, thickness= 40 mm=0.04m

Wet volume = 50m2×0.04m =2m3

Weight of 1 bag cement=50 kg

Volume of sand =26.839 cft

Volume of aggregate=53.678 cft

2) volume of sand in CFT=26.839 cft

3) volume of aggregate=53.678 cft