Study on Creep Mechanical Properties of Non-Water Reacting Polyurethane Grouting Material

Table 3

Axial strain and elastic modulus in each loading stage during the creep test.

Density (g/cm^3)	Loading level	ε t	ε i	ε c	ε c /ε t	E i (MPa)
0.408	Preloading	0.17	0.17	—	0	—
	58.1%	4.70	3.48	1.22	25.96%	192
	65.3%	1.52	0.30	1.22	80.26%	235
	72.6%	2.41	0.31	2.10	87.14%	233
	79.8%	4.62	0.33	4.29	92.86%	225
	87.1%	6.18	0.36	5.82	94.17%	217
	Sum	19.60	4.95	14.65	74.74%	220
0.567	Preloading	0.18	0.18	—	0	—
	40.2%	2.72	2.48	0.24	8.82%	399
	47.8%	0.58	0.35	0.23	39.66%	450
	55.3%	0.64	0.35	0.29	45.31%	445
	62.9%	0.78	0.35	0.43	55.13%	435
	70.4%	1.17	0.35	0.82	70.08%	432
	75.4%	2.80	0.40	2.40	85.71%	260
	83.0%	2.97	0.39	2.58	86.87%	390
	90.6%	4.12	0.41	3.71	90.05%	374
	98.1%	5.61	0.41	5.20	92.69%	365
	105.6%	7.13	0.43	6.70	93.97%	357
	Sum	35.87	6.54	29.33	81.77%	405