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ASTM C-1107

This is the most common specification covering three grades of non-shrink grout:

Grade refers to the expansive mechanism

Grade A Pre-Hardening Volume-Adjusting: Volume control of grout is caused by expansion before hardening occurs.
Grade B Post-Hardening Volume-Adjusting: Volume control of grout is caused by expension after grout hardens.
Grade C Combination Volume-Adjusting: Volue control of grout is caused by a combination of both mechanisms.

Performance Requirements @ Highest Water Content

Compressive Strength

1 day	1000 psi
3 day	2500 psi
7 day	3500 psi
28 day	5000 psi

Early Age Height Change	Grade A	Grade B	Grade C
Max % @ Final Set	+4.0%	N/A	+4.0%
Min % @ Final Set	0.0%	N/A	0.0%

Height Change of Moist Cured Grout @ , 3, 14, & 28 Days	Grade A¹	Grade B²	Grade C
Max % @ Final Set	N/A	+0.3%	+0.3%
Min % @ Final Set	0.0%	0.0%	0.0%

¹ If post-hardening expansion occurs during evaluation of a Grade A material, then the material shall be evaluated according to the Grade C criteria.

² If pre-hardening expansion occurs during evaluation of a Grade B material, then the material shall be evaluated according to the Grade C criteria.