6-laboratoriya ishi Mavzu: Yo‘l to‘shamasining mustahkamligini aniqlash Ishning maqsadi

R	α-90	α-45	α	α+45	α+90	R	α-90	α-45	α	α+45
α+90
20	125	115				38	370	350	320	280	260
21	135	125				39	380	370	340	300	280
22	145	135	110			40	400	380	350	310	295
23	160	145	120			41	410	400	370	330	310
24	170	160	130			42	425	415	380	345	325
25	180	170	140	100		53	440	430	400	360	340
26	198	185	158	115		44	460	450	420	380	360
27	210	200	165	130	105	45	470	460	430	395	375
28	220	210	180	140	120	46	490	480	450	410	390
29	238	220	190	150	138	47	500	495	465	430	410
30	250	238	210	170	145	48	520	510	480	445	430
31	260	250	220	180	160	49	540	525	500	460	445
32	280	265	238	190	170	50	550	540	515	480	460
33	290	280	250	210	190	51	570	560	530	500	480
34	310	290	280	220	200	52	580	570	550	515	500
35	320	310	280	238	218	53	600	590	565	530	520
36	340	320	290	250	230	54	600	600	580	550	530
37	350	340	310	265	245	55	600	600	600	570	550

Sementbeton qoplamasi mutahkamligini baholash bikr yo‘l to‘shamalarini loyihalash bo‘yicha yo‘riqnoma MQN 44-2008 asosan betonning mustahkamlik bo‘yicha sinfini 11-jadvalga asosan qabul qilish lozim.
11-jadval

Yo‘l to‘shamasining tuzilmaviy qatlami	Avtomo-bil yo‘lining darajasi	Hisobiy yuklama jadalligi, birl/dona	Mustahkamlik bo‘yicha minimal loyihaviy sinflar (markalar)
			egilishdan cho‘zilishga Вtb(Рtd)	siqilish-ga В(М)
Monolit bir qatlamli qoplama yoki ikki qatlamli qoplamaning yuqori qatlami	I	2000 dan ortiq	4,4(5,5)	35(450)
	II,III	1000 dan 2000 gacha	4,0(50)	30(400)
	IV	1000 dan kichik	3,6(45)	25(300)
Ikki qatlamli yaxlit qoplamaning ostki qatlami	I-II	1000 dan katta	3,2(40)	-
	III-IV	1000 dan kichik	3,2(35)	-

Topshiriq: Sement materialidan yasalgan kub shaklidagi namunalarni mutahkamligini DT-1000 markali Shmidt bolg’asi yordamida baholash.