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–

142

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691

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я	я, 394006, .	, .20-	я я, 84
я	:	, e-mail:[e-mail]

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51

,	№ 2 (17), 2018

					,
,
.			,		-
c			D1300	2,62	,
D1400 – 5,47	.
	D1300 – 2,		D1400 – 1,37.		-
		63.13330.2012 «
.	»				.
:	,	,	,

DEFINING THE DESIGN CHARACTERISTICS OF FOAM CONCRETE

S.A. Boev

Voronezh state technical University, Russian Federation,

394006, Voronezh, ul. 20 years of October, 84

* Corresponding author:: Boev Sergey Alekseevich, E-mail: [e-mail]

In this paper the normative resistance to compressive strength of foam concrete of different densities were studied and determined bytesting technique and statistic analysis. Urbanization required the intensification of construction processes in the implementation of mass construction of rapidly growing cities. The increase in the dimension of housing construction is provided by the transition to new architectural and construction systems, types of buildings and modern technologies for their construction, a decrease in resource intensity, energy and labor costs in the construction and operation of housing. In the structure of wall and heat insulation materials of the construction industry of the Russian Federation, two main varieties of cellular concrete occupy a significant place: autoclaved aerated concrete and non-autoclaved cellular concrete (foam concrete). Technologies of monolithic construction with the use of nonautoclaved cellular concrete (foam concrete) is one of the promising directions of the development of the building complex, since all structural elements of the building can be built from a material of different density obtained on the same raw materials and equipment.The technique of

52

,	№ 2 (17), 2018

testing and statistical processing of data, the results of an experimental and calculated evaluation of the standard resistance to compressive strength of foam concrete of various densities are described. On the basis of the data obtained during the experiment, diagrams were constructed that visually reflect the density of the empirical and theoretical frequency distributions obtained in the calculation. On the basis of a comparison of the critical value of Pearson's criterion with the theoretical one, we found out that all controlled parameters obey the normal distribution law. The results of statistic analysis showed that the standard resistanceof the foam concrete grade at an average density of 1300 is 2,62, grade at an average density of 1400 – 5,47. Coefiicient reliability of foam stamps by average density 1300 is equal to 2, brands at an average density of 1400

– 1,37. The obtained results are correlated with SP 63.13330.2012 «Concrete and reinforced concrete structures. The main provisions», we conclude that the performance of foam concrete grade at an average density of 1400 correspond to the required, and the brand at an average density of 1300 less than the required normative document values.

Keywords: foam concrete, performance, properties and design characteristics.

. XX	–	,
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53

,	№ 2 (17), 2018

		30-50 %.
			-
700	/ 3	– 1200 / 3,	-
	1200-1300	/ 3,
1400 /	3.		-
	,	–	,
			Д1-6].
			-
	.
		,	-
	,	:
–			Rbn;
–			Rbtn.
		:
–
	(	) εb0	εbt0;
–		Eb;
–		φb,cr;
–		(	-
) υb,P;
–			αbf .
			-
		Rbn
		.

54

,	№ 2 (17), 2018

																			-
		2											10×10×10						-
					D1300			D1400 (					. 1).
																			-
	36	.
		18105-2012					28												-
		.							c										-
											.		. . .
											4-
									1500HDX								INSTRON
(	).
																			. 1.
																			1
№			,														/		- ,
/	/ 3		:
					,		,		,		,					,
1	1300			2,2		3,8			770		11,0				2,75		0,3		36
																	5
			1:1,75
2	1400			2,5		4,4			750		12,5				3,13		0,3		36
												Rbn							-
		.
	1.
											:			, S, ,		.
								,									Д7,8].
	2.															.

55

,	№ 2 (17), 2018

3.

.

4.

χ2 –

.

5.

P=0,95,

.

6.

31359-2007 «

.		».
7.		31359-2007 «
.		».
8.
		63.13330.2012
«	.	».

																-
					-							. 2.
																2
												(28		)
			C .			.		. .		,		-		-		-
									,					-		-
				.						α
							S
		-	1289	/	3		16,2	/	3		±1,37
1270-										1560,08			0			1,25
1325
		-
/	3		4,12				0,94			0,13	±0,08		0			12,30
1371-		-	1397	/	3		13,4	/	3		±1,12
										431,11			0			0,96
1425
		-
/	3		7,11				1,04				±0,09
										0,36			0			14,65

56

,	№ 2 (17), 2018

				-
	(			)
2.
				.
				-
	.
z	(z) –			-
8 .				-
	,			-
.				2i
.				2-
2 =	=1	( − )2	,	(1)
				-
				.

. 1.

= 1270-1325 / 3

57

,	№ 2 (17), 2018

. 2.

= 1270-1325 / 3

. 3.

= 1371-1425 / 3

. 4.

= 1371-1425 / 3

58

,	№ 2 (17), 2018

	(
	df= N-1
	2э
-	df=34, 2
-	df=34, э
	(
	df= N-1
	э
-	df=35, 2
	2
-	df=35, э

1325 / 3 1371-1425 / 3

,

( )

–

(

3 4

),

=26,42< 2е

=18,82< 2е

),

=14,99< 2е

=5,98< 2е

:

(2)(3).

		-
	N	-
= 1270-1325	/	3:
=48,6
=48,6
		-
	N	-
1371-1425 /	3:
=49,8
=49,8
		,
		-
,		1270-

.

.

(Rbn),

	=	(1 −				),			(2)
		−−
	=	1	1,64		,				(3)
		1	3
						,	–	,	-
=0,95, =1,65), –									-
								D 1300

59