The paper presents mathematical modeling of additives and water’s effect on foam concrete’s compressive and flexural strength at 28 days of normal hardening. The requirements of GOST 10180-2012 determined the compressive and flexural strength of foam concrete. The initial composition of the foam concrete mix was calculated using the absolute volume method.
Results received first-order regression equations. The compressive strength and flexural strength of foam concrete depended on the relations from
x
1
(
W
O
P
C
+
B
F
S
)
to
x
3
(
S
F
90
O
P
C
)
and the image surface expression and objective function for the regression equations. The optimal value obtained: compressive strength = 8.075 MPa and flexural strength 1.087 MPa.
This paper concerns with effects of various types of microstructure on machinability of 38XH3MΦA steel. The machinability of steel is preliminarily evaluated by measuring the abrasion wear of end mill cutters upon machining samples of different microstructures in the same cutting condition. The obtained results can be the base for choos- ing optimal microstructure to machine this type of steel.
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