Statistical analysis of the micro-hardness and compressive strength
values was carried out using the SPSS version 20 software.
These differences mainly occurred in locations 3 and 4, which both had lower compressive strength
For compressive strength
tests, standard cube specimens of size 150 x 150 x 150 mm are cast and tested under compression using 3000 KN testing machine at standard rate of loading suggested by IS 516 (BIS 1956).
It was observed that 0.5 M [Na.sub.2]S[O.sub.4] solution greatly increased the compressive strength
of PCC35 compared to nonactivated PCC35 on the 28th day of curing.
For the estimation of compressive strength
, the OriginPro 7.5  program was used to set the cement fineness modulus and age as the independent variable and compressive strength
as the dependent variable, to calculate parameters such as slope and intercept by conducting multiple regression analysis.
. Dirt and water were cleaned from the specimens using a damp cloth.
As we can see from Figure 1, regardless of the amount of active magnesia tested, the strength of the blocks is significantly higher than the compressive strength
of the active magnesia block.
The residual compressive strength
results of mortars after exposure to 300, 600 and 900[degrees]C temperatures are presented in Table 3.
The effect of the type of steel fibres (CM and DM) on the compressive strength
of HSC was also studied by considering the volume contents of 2 and 3% of both steel fibres.
The decrease of the compressive strength
of concrete specimens with 50% and 100% metakaolin ALWA, compared to the one with 0%, are 8.6 MPa (28%) and 12.6 MPa (40%), respectively.
In this research work, an attempt was made to analyse the effect of curing on compressive strength
5 shows the compressive strength
28 days after casting for concrete samples (a) resptively mortar samples (b).