# Compressive Strength of Hardened Concrete Using Schmidt Hammer

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• Topic: Compressive strength, Compressive stress, Mathematics
• Pages : 3 (462 words )
• Published : October 3, 2012

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5. Results:
Compressive Strength of Concrete Structures
Using Schmidt Hammer

DATA AND CALCULATION SHEET

Sample Identification: R14 floor

Description:

Sample age at test:

Element type:

Application Direction| | | |
Rebound number readings| 26| 29| 24| 32| 26|
| 31| 32| 34| 22| 30|
Average Rebound Number| (1) 29 |
Estimated compressive strength (MPa)| (2) 28 MPa|

Compressive Strength of Cube Concrete Specimens

DATA AND CALCULATION SHEET

Sample Identification: R14 cube

Description:

Sample| 1|
Width (mm)| 103.5| 99.3|
Depth (mm)| 99.4| 101.1|
Average Width W (mm)| (3) 101.4|
Average Depth D (mm)| (4) 100.3|
Cross section area A (mm2) = WxD| (5) 1.017×104|
Height L (mm)| 100.1|
Sample mass (kg)| 2.39|
Density (kg/m3)| (6) 2.35×103|
Compression failure load F (kN)| 208.8|
Compressive strength (MPa)| (7) 2.053×101|

Compressive _ Strength  F A

Remarks:

Tested by:

Date:

-calculations:
1- average=1Ni=1Nxi
= 26+29+24+32+26+31+32+34+22+3010 =29
2-

3- ωavg= 103.5+99.32 4- davg = 99.4+101.12 =101.4 mm = 100.3 mm 5- Area=ω×d 6- D= mV =101.4×100.3 =1.017×104 mm2 = 2.35 × 103 kg/m3 = 2.39kg(101.4mm×100.3mm×100.1mm)×1m3109mm3

7- compressive strngth= FA
=208.8kN×103NkN1.017×104mm2×m2106mm2×MPa106Pa =2.053×101MPa

6. Discussion of Results:
-Non-Distractive Test...