GB/T 177-1985: Test method for strength of hydraulic cement mortar

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Scope

1.1 Mortar mixer
Mortar mixer is in type of blades double-turning; the stirring blades and stirring bowl
are turned in reverse direction. Blades and bowl are made of wear-resistant metallic
material; the gaps BETWEEN blades AND bowl-bottom and bowl-wall are 1.5 ±
0.5mm. The manufacturing quality shall comply with provisions of GB3350.1-82
“Apparatus for physical test of cement - -Mixer for mixing mortars”.
1.2 Mortar vibrostand
Mortar vibrostand (Figure 1) is vibrated by an electrical motor that is mounted with 2
symmetrical laterality wheels. When using, fix it to the concrete base and comply with
the provisions of GB 3350.2-82 "Apparatus for physical test of cement - Vibrator for
compacting mortar specimen".
1.3 Mould and baiting funnel
1.3.1 Mould is detachable triple-mould; it is consisted by partition-plates, end-plates,
and base etc. The manufacturing quality shall comply with provisions of GB 3350.5-82
“Apparatus for physical test of cement - Specimen mould for use in testing mortar
strength”. For the mould in use, the mould-cavity height must not be less than 39.8mm,
mould-cavity width must not be greater than 40.2mm.
1.3.2 Baiting funnel (Fig. 2) is consisted of funnel and die ring. Funnel is made of
0.5mm galvanized iron sheet, the feeding mouth’s width is generally 4-5mm. Die ring’
height is 25mm, made of metal material. Baiting hopper’s weight is 2.5 ~ 2.0kg.
1.4 Flexural testing machine
Flexural testing machine generally uses double-level type; it may also adopt others of
which the performance meets the requirements. Flexural jig shall comply with the
requirements of 2.5 ~ 2.9 in GB 3350.3-82 "Apparatus for physical test of cement -
Electrically driven flexure testing device".
Loading and support cylinder must be made of hard steel material, After abrasion, the
allowed dimensions of the cylinder is.
10- mm.
0.2
1.5 Compressive testing machine and compression jig
1.5.1 Tonnage of compressive testing machine should be to 20 ~ 30t, the error must
not exceed ± 2.0%.
1.5.2 Compressive jig is made of hard steel material, and complies with GB 3350.4-82
" Apparatus for physical test of cement compression jig".
1.6 Calibrating knife
Calibrating knife’s section is an equilateral triangle, the effective length is 26mm.

Basic Data

Standard ID	GB/T 177-1985 (GB/T177-1985)
Description (Translated English)	Test method for strength of hydraulic cement mortar
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	Q11
Classification of International Standard	91.100.10
Word Count Estimation	4,415
Date of Issue	6/29/1985
Date of Implementation	10/1/1985
Older Standard (superseded by this standard)	GB 177-1977
Regulation (derived from)	National Standard Committee Bulletin (2005 No. 146)
Issuing agency(ies)	National Bureau of Standards