Here is complete details stepwise to achieve the 4000psi strength of concrete block using Mix Design Method.

Reinforced Concrete – II

Open Ended Lab

Synopsis.

ΓΌ  Introduction

ΓΌ  Mix design steps in detail / Methodology

ΓΌ  Test every material in the selection of mixed design for the achievement of its required

ΓΌ  value according to your selection.

ΓΌ  Experimental results with graphs

ΓΌ  Result discussion

ΓΌ  Conclusion

ΓΌ  References

Group Members

 

Name.

Roll No.

Saood khan

UET-19F-CE-012

Zeeshan Ahmad

UET-19F-CE-065

Umer Aziz

UET-19F-CE-040

Tanveer Alam

UET-19F-CE-98

 

Submitted To: Engr. Usman Ali


Test every material in the selection of mixed design for the achievement of its required

Ratio Calculation.

Here is complete data of mix design, now to salect the ratio of cement, water, fine aggregate, coarse aggregate. But according to ACI the course aggregate should be taken ½ pass upto 35% and ¾ pass is 65%. Our ratio is 1:1.8:2.4. Calculation of the ratio 420/420 Which is rqual to 1 so cement is salected 1. Now for water 180/420 which is equal to 0.43. Now for fine aggregate 760/420 which is equal to 1.8. Now for Course aggregate 350/420 which is equal to 2.4. The range of the slump is should be 25mm to 75mm.                                   Table 1


 

value according to your selection.

Calculate Materials for Blocks.

We first calculate the materials for slump volume but to achieve the 4000psi the blocks must be in range of ACI design. So we calculate the quantity of material for 4 blocks with size of 6*6*6. For each block the value of Aggregate is 4.11kg Sand is 2.94kg Cement is 1.47 and 910ml of water for each block.

Note: The water for each block is calculated like this 180/420 which is equal to 0.43 now the W/C is equal to w/c*cement quantity which is equal to 1.47 which is equal to 0.63kg now to convert ml multiply by 1000 so result is 630ml for each block TABLE 2.How to achieve 4000psi strength using ACI design Method.

To find the volume of mold.

V = L*W*H

V = 6*6*6

V = 216in3

Convert to mm multiply by (25.4)3

V = 216*(25.4)3

V = 3539605.8mm3

Now to convert to m from mm so divide by (1000)3

V= 3539605.8/(1000)3

Vwet= 0.0035m3

To find dry volume

V= 0.0035*1.54

V= 0.0053m3

 

 

Now to calculate Cement Quantity For Each Block

Cement = (1/5.2)*0.0053*1140 = 1.47kg (For each Block)

Sand = (1.8/5.2)*0.0053*1602 = 2.94kg (For each Block)

Aggregate = (2.4/5.2)*0.0053*1680 = 4.11kg ( For each Block)

Table 2

 

Calculation for Each block of water

W/C Ratio = 180/420

0.43*Cement Quantity

Cement Quantity = 1.47

0.43*1.47 = 0.63kg.

Convert to ml Multiply by 1000

0.63*1000

630ml for each block

So for 4 blocks = 630*4

Water = 2520ml

                                                              


Experiment Performing Time Taken some picture.

 

Sieve Analysis to 60% pass by ¾ & 30% pass by ½

 



Weighting of Sand



 

Labelling of blocks ( Dates, secton, department, group no, department)

 

 



Carefully check the weight of the sand


 

Here check the check of slump value is which is 2.05inches which is equal to 52mm. So our slump value is in range.

 

 

Experimental results with graphs.

Slump value Result.

The slump value is already discus which is in the range. The slump value is 52mm requirements of the ACI design is they must be in the range of 25mm to 75mm.

 

THE AREA IS CALCULATE 6*6= 36 inches to convert to mm so multiply by (25.4)2

 

Different results at different weeks

Load at which the block are fail = 248KN ( FOR FIRST WEEK).

Load at which the block are fail = 271KN ( 2 WEEKS)

Load at which the block are fail = 310KN (2 WEEKS 5 DAYS)

One Block is in pending……….still in water THE NEXT FRIDAY IS TIME TO DEMOLD THE 4TH ONE BLOCK

 

First to draw the table how we calculate the Compressive Strength of the Block.

Compressive strength = Load / Area

Let For first week.

CS = (248*1000)/(23225.76)

CS = 10.68 Mpa

Convert to Psi

CS = 10.68*145.038

CS = 1550Psi

 



 

Duration

Compressive Strength in KN

Area of the block in mm

Compressive Strength in Psi

Percentage(%) Of achievement

7 Days

248

23225.76

1550

38.75%

14 Days

271

23225.76

1693

42.33%

19 Days

311

23225.76

1942.10

48.55%

28 Days

-------

23225.76

------

 

 

Result discussion.

After performing test on different blocks which give us different results. But the main issues is that we doing our job best but we didn’t achieve the 4000psi Compressive Strength. Here we achieved different results on 7 days up to 1550 psi, on 14 days up to 1693 psi, and on 19 days achieve the result in psi 1942.10psi. How to achieve 4000psi strength using ACI design Method. Also mention the % which is achieved by us at different days. The % is taken against 4000psi. we just compare our results. How much we achieved the Compressive Results against 4000psi.


Conclusion.

At the result here the main goals is to achieve the require compressive strength. Our calculation is taken carefully & also perform the all experiments carefully. But during concrete block construction we make some errors. How to achieve 4000psi strength using ACI design Method.

ΓΌ  Improper cuing

    Improper mixing of concrete