IS 13030: Method of test for laboratory determination of water content, porosity, density and related properties of rock material

13 Pages·1991·1.5 MB·English

by  Bureau of Indian Standards

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“The Right to Information, The Right to Live” “Step Out From the Old to the New”
IS 13030 (1991): Method of test for laboratory
determination of water content, porosity, density and
related properties of rock material [CED 48: Rock
Mechanics]
“!ान $ एक न’ भारत का +नम-ण”
Satyanarayan Gangaram Pitroda
““IInnvveenntt aa NNeeww IInnddiiaa UUssiinngg KKnnoowwlleeddggee””
“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता हहहहै””ै”
Bhartṛhari—Nītiśatakam
“Knowledge is such a treasure which cannot be stolen”

IS 13030 : 1991
‘ye2 qSfq”
WTef Jv=m
“RE~AFFIRMED 19%”

Indian Standard’
METHODOFTESTFOR
LABORATORYDETERMINATIONOF
WATERCONTENT,POROSITY,DENSlTYAND
RELATED PROPERTIESOFROCK MATERIAL
UDC 624.121~43
”

m BIS 1991
BUREAU OF INDIAN STANDARDS
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002
Muy 1991 Price Group 3
Rock Mechanics Sectional Committee, CED 48
.
FOREWORD
This Indian Standard was adopted by the Bureau of Indian Standards, after the draft finalized by the Rock
Mechanics Sectional Committee had been approved by the Civil Engineering Division Council.
The presence of pores in fabric of a rock material decreases its strength and increases its deformability. A
small volume fraction of pores can produce an appreciable mechanical effect.
Information on the porous nature of rock materials is frequently omitted from petrological descriptions but
is required if these descriptions are to be used as a guide to mechanical performance. Sand stones and
carbonate rocks in particular occur with a wide range of porosities and hence of mechanical character;
igneous rocks that have been weakened by weathering processes also have typically high porosities.
Most rocks have similar grain densities and therefore have porosity and dry density values that are highly
correlated. A low density rock is usually highly porous. It is often sufficient, therefore, to quote values for
porosity alone but a complete description requires .values for both porosity and density.
Different methods of determination of density and porobity described in the standard are suitable for
different types of rocks and sample, While method using saturation and caliper technique and using satu-
ration and buoyancy technique are suitable for regular and irregular shape of sample respectively of those
rocks which do not appreciably swell or disintegrate when immersed in water, the method using mercury
displacement and grain specific gravity technique is suitable for irregular shape of such rock which are
liable to swell or disintegrate when immersed in water.

These methods are based on the suggested method of International Society of Rock Mechanics.

In reporting the results of a test or analysis made in accordance with this standard, if the final value,
observed or calculated, is to be rounded off, it shall be done in accordance with IS 2 : 1960 ‘Rules for
rounding off numerical values ( rsvised )‘-
IS 18030: 1991
I&& Stan&-& .~’ . ~.
METHODOFTESTFOR
LABORATORYDETERMINATIONOF
WATERCONTENT,POROSITY,DENSITYAND
RELATED PROPERTIESOFROCKMATERIAL
1 SCOPE
2.2.6 Porosity n = -> x 100 ( percent )
This standard gives the procedure for the test
to evaluate water content, porosity, density and
2.2.7 Void Ratio e = +
related properties of rock material. The following 8
test methods have been covered:
2.2.8 Density or Bulk Density or Mass Density
a) Determination of the water content of rock
(p)LLL”qMw
sample; kg/m3
b) Determination of porosity and density using
saturation and caliper technique;
2.2.9 Relative Density
c) Determination of porosity and density using
saturation and buoyancy; and ( mass specific gravity ) G, e c
d) Determination of porosity and density using
mercury displacement and grain specific
2.2.10 Dry density pa= z;- kg/m3
gravity technique.
2 DEFXNITIONS AND SYMBOLS 2.2.11 Dry Relative Density
2.1 Symbols
( dry specific gravity ) Ge = 2
For the purpose of this standard unless otherwise
defined in the text, the following symbols shall 2.2.12 Saturated Density
apply: MS + : wP‘ kg/m3
tssp =
SM - Mass of grain ( the solid component of
the sample )
- 8-v = Volume of grain 2.2.13 Saturated Relative Density
Psat
M, = Mass of pore water ( saturated specific gravity ) G,, = ~
Pw
p, = Volume of pore water
2.2.14 Solid Density or Density
P, = Density of water
MS
V, = Volume of pore air of Rock Material ps = -v- kg/ms
8
2.2 Definitions
2.2.15 Solid Relative density
For the purpose of this standard, physical proper-
ties pertinent to the methods of test shall be ( solid specific grgvity ) Gs = -$
described as follows.
2.2.1 Bulk Sample Mass M = MS + M, 2.2.16 Unit Weight y = P x g N/m3
2.2.2 Bulk Sample Volume V = Vi + Vv
3. TEST SAMPLE
2.2.3 Pore ( Voids ) Volume V, = VW + V,
A representative sample for testing should
2.2.4 Water Content, w generally comprise several rock lumps, each in
MW order of magnitude larger than the largest grain
= - X 100 (percent )
or pore size. Microfissures of similar size to that
MS
of a rock will cause erratic results, their presence
2.2.5 Degree of Saturation, Sr
should be noted and if possible the lump size
increased or reduced to specifically include or
= + x 100 ( percent )
P exclude the influence of such fissures.
4 DETERMINATION OF THE WATER 4.4.2 The water content should be reported to the
CONTENT OF A ROCK SAMPLE nearest O-1 percent stating whether this corres-
ponds to in situ water content, in which case
4.1 Object
precautions taken to retain water during sampling
This method of test covers the procedure of deter- and storage should be specified.
mining the mass of water contained in a rock
5 POROSITY AND DENSITY
sample as a percentage of the oven dry sample
DETERMINATION USING SATURATION
mass.
AND CALIPER TECHNIQUES
4.2 Apparatus 5.1 Object
4
An oven capable of maintaining a tempera- 5.1.1 This method of test covers the procedure for
ture of 105 f 3°C for a period of at least determining the porosity and dry density of rock
24 h. samples in the form of specimen of regular geome-
b) A sample container non-corrodible material try.
including an airtight lid. 5.1.2 The method is applicable only to nonfriable
lC A desiccator to hold sample container coherent rocks that can be machined and do not
during cooling. appreciably swell or disintegrate when they are
4 oven dried or are immersed in water. The method
A balance of adequate capacity, capable of
is suitable when regularly shaped specimens are
weighing to an accuracy of 0.01 percent of
required for other test purposes.
the sample mass.
5.2 Apparatus
4.3 Procedure 4 An oven capable of maintaining a tempera-
4.3.1 The container with its lid is cleaned and ture of 105 & 3°C for a period of at least
dried, and its mass m, is determined. 24 h.
b)
A desiccator to hold specimen during
4.3.2 A representative sample comprised at least
cooling.
10 lumps each having either a mass of at least 50 g
or a minimum dimensions of ten times the maxi- C> A measuring instrument such as vernier or
mum grain size, whichever is greater, is selected. micrometer caliper, capable of reading
For in situ water content determination sampling, specimen dimensions to an accuracy of
storage and handling precautions should be such 0.1 mm.
that water content remains within 1 percent of 4 Vacuum saturation equipment such that
the in situ value. the specimen can be immersed in water
under a vacuum of less than 0.8 kPa for a
4.3.3 The sample is placed in the container, the
period of‘ at least one hour.
lid replaced and the mass ma of the sample plus
e)
container determined. A sample container of non-corrodible mate-
rial, including an airtight lid.
4.3.4 The lid is removed and the sample dried to f 1
A balance of adequate capacity for deter-
constant mass at a temperature of 105 f 3°C.
mining the mass of a specimen to an
4.3.5 The lid is replaced and the sample allowed accuracy of 0.01 percent of the specimen
to cool in the desiccator for 30 minutes. The mass mass.
m3 of sample plus container is determined. 5.3 Procedure
4.4 Calculation and Reporting of Results 5.3.1 Select at least three specimens from a
representative sample of material. Machine each
4.4.1 The water content shall be calculated from specimen to conform closely to the geometry of a
the following formula: right cylinder or prism. The minjmum size of
each specimen should either be such that its mass
Water content, w is at least 50 g ( for an average density rock a
cube with sides of 27 mm will have sufficient
Pore water mass AI,
= x 100 ( percent ) mass ) or such that its minimum dimension is at
Grain mass Ma
least ten times the maximum grain size, whichever
m3 - m3 is the greater.
= -- X 100 ( percent )
ms - ml 5.3.2 Repeat the following procedure for each of
the specimen in the sample:
m, = Mass in g of the container with its lid
at room temperature i) Determine the external dimension and then
bulk volume voof each specimen with the
m2 = Mass in g of the container with its lid vernier or calipers. Measurement should
and the sample at room temperature
be accurate to 0.1 mm. An average of three
m3 - Mass in g of the container with its lid separate measurement should be obtained
and the sample after drying for each dimension.
2
IS il3030: 1991
b!
ii) Place the specimen in an oven and dry at Report that the bulk volume was obtained
105 f 3°C. For this test method specimens by measurement of dimension by caliper or
should be of sufficient coherence not to vernier and the pore volume was obtained
require containers, but these should be by water saturation.
used if the rock is at all friable or fissible. cl Record any change in the shape and size of
The specimen is deemed to be dry when
the rock specimen during wetting or
the difference between successive deter-
drying.
minations of mass of the cooled specimen 4
Record the following general information:
at intervals of 4 hours does not exceed 0.1
percent of the original mass of the speci- i) Project title.
men.
ii) Sampling technique and sample identi-
iii) Remove the specimen from the oven and fications number.
place in a desiccator to cool. iii) Dates of sampling and of testing.
iv) Determine the dry mass, &I~, of the speci- iv) Lithological description of the rock
men.
samples.
v) Immerse the specimen in a container of
water and place the container with the 6 POROSITY AND DENSITY
specimen in a vacuum of less than O-8 kPa DETERMINATION USING SATURATION
for a period of one hour with periodic AND BUOYANCY TECHNIQUES
agitation to remove trapped air.
6.1 Object
vi) Determine the water temperature, t, to the
nearest degree centigrade. This method of test covers the procedure for
determining the porosity and the dry density of a
vii) Remove the specimen from the container
rock sample in the form of lumps or aggregate of
and surface dry it using a moist cloth.
irregular shape-geometry. It may also be applied
Care should be taken to remove only surface
to a sample in the form of specimens of irregular
water and to ensure that no fragments
geometry.
are lost.
viii) Determine the saturation mass, Msat, of the 6.1.1 The method should only be used for rocks
specimen. that do not appreciably swell or disintegrate when
oven-dried and immersed in water.
-5.4 Calculations
6.2 Apparatus
a)
For each specimen calculate the pore
volume, VV, by the following formula: 4 An oven capable of maintaining a tempera-
ture of 105 f 3% for a period of at least
VV = M”“t-, Ma
24 h.
A sample container of non-corrodible
where pw = density of water at tempera- material, including an air-tight lid.
ture, t.
b) A desiccator to hold sample container
For each specimen calculate the bulk
during cooling.
volume, V, from the external dimensions.
A vacuum vessel such that the sample can
c) For each specimen calculate the dry density,
be immersed in water under a vacuum of
Fd, by the following formula:
less than 0.8 kPa for a period of at least
1 h.
Fd = + ( kg/m3 ) e) A balance of adequate capacity, capable of
4 For each specimen calculate the porosity, n, weighing to an accuracy of 0.01 percent of
by the following formula: the sample weight.
Vv f 1 An immersion bath and a wire basket or
n=--- v x 100 ( percent )
perforated container, such that the sample
)e Calculate average values of porosity and immersed in water can be freely suspended
from the stirrup of the balance to deter-
dry density for the sample.
mine the saturated-submerged weight. The
5.5 Reporting of Results basket should be suspended from the
balance by a fine wire so that only the wire
a) Report the individual dry density and
intersects the water surface in the immer-
porosity values for each specimen in the
sion bath.
sample, together with the average values of
dry density and porosity for the sample. 6.3 Procedure
Density values should be given to the
nearest 10 kg/m3 and porosity values to a) A representative sample comprising at least
the nearest 0.1 percent. 10 lumps of regular or irregular geometry,
3
c IS 13030 i 1991
each having either a mass of at least 50 g
Determination .A%. .(I) (2) (3)
or a minimum dimension of at least 10
times the maximum grain size, whichever
4) Saturated surface dry
is the greater, is selected. The sample is
mass of the sample
washed in water to remove dust.
plus container, Mq
b)
The sample is saturated by water immer- in kg
sion in a vacuum of less than 0,s kPa for a
5) Dried mass of the
period of at least 1 h, with periodic
container with sam-
agitation to remove trapped air.
c> ple, Mb in kg
Determine the temperature, t, of the water
6.5 Calculations
in the immersion bath to the nearest degree
centigrade. a) Calculate the saturated-submerged mass,
4 Determine the mass, MI, of the basket sub- Msub, of the sample
merged in the immersion bath.
e> M sub = MB - Ml ( kg )
Transfer the sample under water to the
b) Calculate the saturated-surface-dry mass,
basket in the immersion bath. Determine Msat, of the sample
the saturated-submerged mass, M,, of the
basket plus sample to an accuracy of 0.01 &at = M4 - ~43 ( kg >
percent of the sample mass. lC Calculate the dry mass ( Grain Weight )
f
1 Determine the mass, Ma, of a clean, dry MS, of the sample
d Rsaemmpovlee ctohnet ainsearm plaen d frloidm. the immersion 4 CalculaMtes = thMe b b- ulkM-Sv olu( mkeg , 1 V, of the
bath and surface dry the sample with a
sample by the following formula:
moist cloth, care being taken to remove
only surface water and to ensure that no v tasM - busM >( m3 1
C
rock fragment are lost. Transfer the sample PW
to the sample container and replace the Pw = density of water at temperature t
lid. Determine the mass, M1, of the satura-
4
ted surface dry sample plus container. Calculate the pore volume, V, of the sample
h) Remove the lid and place the container by following formula:
with contents and lid in the oven and dry ta& - SM
V =v ( ms 1
at 105 & 3°C. The sample is deemed to >
PW
be dry when the difference between succes- f > Calculate porosity, n, of the rock sample
sive determination of mass of the cooled by the following formula :
sample at interval of 4 hours does not
exceed 0.1 percent of the original mass of n = ( V,/V) x 100 (percent)
the sample. or = ta&l - MS x 100 ( percent )
)i. Replace the lid, remove th e container from Meat - Msub >
the oven and place the whole in the desic- g) Calculate the dry density, Pa, of the rock
cator to cool for 30 minutes. sample by the following formula:
k) Determine the dried mass, MS, of the con-
( kg/m3 1
tainer with the oven dry sample. Pd = +
6.4 Observations
6.6 Reporting of Result
4
Sample No. Date Report the porosity and dry density values
or the sample to the nearest O-1 percent
Temperature of water, t, in Centigrade and 10 kg/m5 respectively.
b)
Report that the bulk volume was obtained
Determination .No. (1) (2) (3)
by a buoyancy technique and that the pore
1) volume was obtained by water saturation.
Saturated-submerged
c j
mass of basket alone, Report the following general information:
MI in kg i) Project title
2) Saturated-submerged ii) Sampling technique and sample identi-
mass of basket + fication numbers
specimen, Ma in kg iii) Date of sampling and testing
3) Mass of container and iv) Lithological description of the rock
lid, MS in kg samples.
4
IS 13030 : 1991
7 POROSITY AND DENSITY b) Repeat the following procedure for each of
DETERMINATION USING MERCURY the specimens in the sampie:
DISPLACEMENT AND GRAIN SPECIFIC 9 Brush each specimen to remove loose
GRAVITY TECHNIQUES material and measure its volume, V, by
mercury displacement.
7.1 Object .
ii) Carefully remove mercury adhering to
4 the sample, ensuring that no rock frag-
This method of test covers the procedure
ment are lost.
for determining the porosity and the density
of a rock sample in the form of lumps or iii) Determine the mass, MI, of a suitable
aggregate of irregular geometry. clean, dry, container and its lid.
b) This is particularly suitable if the rock iv) Place the specimen in the container,
material is liable to swell or disintegrate if replace the lid and determine the mass,
immersed in water. The test is also appli- M,, of the container plus specimen at
cable to regularly shaped rock specimens or imtral water content.
to coherent rock materials but other tech- IV Remove the lid and the specimen is
niques are usually found more convenient oven dried to constant mass at a tem-
in these cases. perature of 105 f 3°C allowed to cool
tbr 30 minutes in a desiccator, The mass,
7.2 Apparatus
MS, of container plus oven dry specimen
a) An oven capable of maintaining a tempera- is determined.
lc
ture of 105 & 3°C for a period of at least Crush all the rock specimens and grind to
24 h. It should have forced ventilation a grain size not exceeding 150 mm. A
exhausting to outside atmosphere. number of representative sub-samples of
b) Specimen containers of non-corrodible about 15 g of the pulverized material are
selected and oven-dried.
material, including airtight lids.
c> 4
Determine the mass, M,, of a clean, dry
A desiccator to hold specimen containers
volumetric flask plus stopper to an accuracy
during cooling.
of 0.001 g.
d) A balance of adequate capacity, capable of e>
Fill the flask with a liquid such as kerosene
mass determination to 0.01 percent of
that is non-reactive with the rock.
sample mass.
e) A mercury-displacement volume measuring f) Bring the flask to equilibrium temperature
in the constant temperature bath and
apparatus capable of measuring specimen
adjust the liquid level accurately to the
volume to 0.5 percent.
f 1 Grinding equipment to reduce the sample 50 ems graduation. Remove the flask from
the constant temperature bath, insert the
to a pulverized powder less than 150 mm in
stopper and clean and dry the outside of
grain size.
the flask.
d
A calibrated volumetric flask and stopper
Determine the mass, ME, of the flask and
( conveniently 50 ems ).
iiquld to an accuracy of 0.01 percent of the
4
A constant temperature water bath. total mass.
)j A vacuum apparatus capable of maintain- h) Empty and dry the flask and add the
ing a vacuum with a pressure of less than representative 15 g sub-sample of dry pul-
0.8 kPa. verized rock with the aid of a funnel.
k) A soft brush of camel hair or of similar >j Determine the mass, MB, of flask, sample
softness.
and stopper to an accuracy of O*OOl g.
7.3 Procedure k) The flask and sub+ample are evacuated for
about 20 minutes and sufficient fluid added
4 A representative sample is selected compris- to thoroughly wet the sample. Further
ing at least ten rock lumps, the shape and fluid is then added and the flask IS carefully
size of lumps suiting the capabilities of the evacuated to remove air. The flask is
volume measuring apparatus. The minimum replaced in the constant temperature water
size of each lump should preferably be bath and the liquid level adjusted accura-
either such that its mass exceeds 50 g or tely to the 50 ems graduation.
such that its minimum dimension is at least
4 The stoppered flask with its contents is
10 times the maximum grain size, which-
allowed to cool and its mass, G, is deter-
ever is the greater. Specimen and swelling
mined to 0.01 percent of the total mass.
or fissible rock should be sampled and stoned
to retain water content to within 1 percent 4 Steps (e) to (m) are repeated for each sub-
of its in situ value prior to testing. sample of pulverized material.
5