# Civil

Topics: Strength of materials, Physical compression, Compressive strength Pages: 3 (380 words) Published: April 18, 2013
Age at Test
(Days)Date TestedAir Cured CubesWater Cured CubesWater Cured Cylinder
SSD Mass
(kN)Compressive Strength
(N/mm2)SSD Mass
(kN)Compressive Strength
(N/mm2)SSD Mass
(kN)Compressive Strength
(N/mm2)
717 Jan2.210313.031.302.268334.033.40
2131 Jan2.270374.037.402.270451.345.13
555 Mar2.290498.649.862.356462.246.2212.198542.330.69

Age at Test
SSD Mass
(kg)ERUDITE Resonant Frequency
(Hz)PUNDIT Transit Time
(x10-6 sec)SSD Mass
(kg)ERUDITE Resonant Frequency
(Hz)PUNDIT Transit Time
(x10-6 sec)
7110.943000119.411.433045118.9
23000119.23495119.2
33000119.64490117.8
21110.923230124.911.453790114.4
23110128.83245114.5
33292124.83590114.4
55110.914075122.711.474275117.0
237353860
336153280
432953670

PUNDIT test ;
E_(c(t))= ρ V^2 ((1+v) (1-2v))/((1-v) )×〖10〗^(-9) v≈0.25
Air
V=4075 m/s
ρ= 2182 kg/m^3
E_(c(t))=30.2 kN/〖mm〗^2
Water
V= 4275 m/s
ρ= 2294 kg/m^3
E_(c(t))=34.9 kN/〖mm〗^2
ERUDITE test ;
E_c(t) = 4 n^2 L^2 ρ× 〖10〗^(-15)
L=500mm
Air
ρ= 2182kg/m^3
n=3680Hz
E_c(t) =29.5 kN/〖mm〗^2
Water
ρ= 2294kg/m^3
n=3771Hz
E_c(t) =32.6 kN/〖mm〗^2
Static ModulusPUNDIT ERUDITE
AirWaterAirWater
E_cm= E_(c(t))/1.0528.833.228.131.0

Direct Static modulus (water cured cylinder)
E_cm=22 〖((f_ck+8)/10)〗^0.3
f_ck=30.69 N/〖mm〗^2
E_cm=33.0 kN/〖mm〗^2
Static Modulus, E_cm=30.8 kN/〖mm〗^2

Flexural Tensile Strength
Air
P=148 kN
f_ct=44.4 N/〖mm〗^2
Water
P=180 kN
f_ct=54 N/〖mm〗^2