ASTM C1151-91

Standard Test Method for Evaluating the Effectiveness of Materials for Curing Concrete (Withdrawn 2000)

SCOPE
1.1 This test method covers laboratory determination of the efficiency of liquid membrane-forming compounds and sheet materials for curing concrete. This test method can also be useful in research work where the effect of different variables on the curing of concrete is studied.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for informational purposes only.
1.3 This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Withdrawn
• Publication Date: 31-Dec-1990
• Withdrawal Date: 09-Jun-2000
• ICS: 91.100.30 - Concrete and concrete products
• Technical Committee: C09 - Concrete and Concrete Aggregates
• Drafting Committee: C09.22 - Materials Applied to New Concrete Surfaces

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn. Contact ASTM
International (www.astm.org) for the latest information.
Designation: C 1151 – 91
Standard Test Method for
Evaluating the Effectiveness of Materials for Curing
Concrete
This standard is issued under the fixed designation C1151; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope ment for 3 days. The test environment may be any set of
conditionsselectedbythetester,providedonlythataminimum
1.1 This test method covers laboratory determination of the
rateofevaporationfromafree-watersurfaceof0.4kg/m /hbe
efficiency of liquid membrane-forming compounds and sheet
maintained.
materials for curing concrete. This test method can also be
3.2 At the conclusion of the storage period, the slabs are
useful in research work where the effect of different variables
demolded and three 25-mm (1-in.) diameter cores are cut at
on the curing of concrete is studied.
random from each of the slabs and stored under methanol for
1.2 The values stated in SI units are to be regarded as the
at least 24 h to stop the hydration of the cement and displace
standard.Thevaluesgiveninparenthesesareforinformational
water. Using a diamond-blade saw and ethanol as coolant, the
purposes only.
top surface of each core is then sliced off, and from the
1.3 This standard does not purport to address all of the
remainingcore,1-cm(0.39-in.)thickdisksarecutfromthetop
safety problems, if any, associated with its use. It is the
and the bottom, then placed in a vacuum desiccator for 24 h.
responsibility of the user of this standard to establish appro-
3.3 The absorptivity of each dried disk is determined by
priate safety and health practices and determine the applica-
weighing it before and after a 60-s contact of its top surface
bility of regulatory limitations prior to use.
with a water-saturated stack of filter paper. The difference in
2. Referenced Documents absorbtivity of the top and bottom disks is a measure of the
effectiveness of the curing.
2.1 ASTM Standards:
C87 Test Method for Effect of Organic Impurities in Fine
4. Significance and Use
Aggregate on Strength of Mortar
4.1 This is an end result oriented test method. The effec-
C150 Specification for Portland Cement
tiveness of a given curing material at a given environmental
C511 Specification for Moist Cabinets, Moist Rooms and
conditionisdeterminedbycomparingthequalityofthesurface
Water Storage Tanks Used in the Testing of Hydraulic
region of a 90.0-mm (3.5-in.) thick mortar specimen with the
Cements and Concretes
quality of the well-protected bottom region of the same
C670 Practice for Preparing Precision and Bias Statements
specimen.Theunderlyingassumptionisthatthebottomregion
for Test Methods of Construction Materials
3 of a 90.0-mm (3.5-in.) thick specimen is little affected by the
C778 Specification for Standard Sand
environmental conditions at the surface that can cause rapid
3. Summary of Test Method evaporation of water. The quality of the mortar is determined
by the degree to which the pore structure of the cement paste
3.1 Three slabs of a standard mortar are molded and after 4
has become less open due to proper hydration of the cement as
h, one is covered with the curing material to be tested, the
indicated by the absorptivity of the mortar.
second is tightly sealed with an impermeable lid, and the third
is left uncovered. All three molds are stored in a test environ-
5. Apparatus
5.1 Mortar Mixer, power-driven, capable of thoroughly
1 1
ThistestmethodisunderthejurisdictionofASTMCommitteeC-9onConcrete mixing batches of the prescribed size (approximately ⁄2 ft for
andConcreteAggregatesandisthedirectresponsibilityofSubcommitteeC09.22on
3 test slabs) at the prescribed consistency. A revolving drum
Curing Materials.
tilting mixer, a revolving pan or a revolving paddle mixer may
Current edition approved Oct. 15, 1991. Published December 1991. Originally
be satisfactory.
published as information only in P198. Last previous edition C1151–90.
Annual Book of ASTM Standards, Vol 04.02.
Annual Book of ASTM Standards, Vol 04.01.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn. Contact ASTM
International (www.astm.org) for the latest information.
C1151–91
5.2 Molds and Lid, watertight, made of metal, glass, hard cross-sectional area next to the test specimens. Sufficient
rubber, or plastic. The molds shall be approximately 310 by amount of water at room temperature to last through the
1 1
165 mm (12 ⁄4 by 6 ⁄2 in.) in horizontal cross-section and 90 6 duration of the curing period shall be put in the containers and
1 1
3mm(3 ⁄2 6 ⁄8in.)deep.Forasetofthreemolds,onelidshall weighed at regular intervals. The mass losses in terms of
be available. kilograms per square metre-per-hour from the two containers
5.3 Balances: shall be averaged.
5.3.1 The balance or scale for determining the mass of the
test specimens shall have a capacity of 50 g or more, sensitive 8. Number of Test Slabs
to0.0001gorless,andaccuratewithin0.01%ofthetestmass
8.1 Make a set of three test slabs for a test of a given curing
at any point within the range of use for this test.
material. If either two or more curing materials, or the same
5.3.2 The balance or scale used for determining the mass of
material at different coverage rates are evaluated at the same
the curing compound, where curing compounds are involved,
time, it is necessary to make only one set of the control slabs,
shall have a capacity of 1 kg or more, be sensitive to 0.1 g or
that is, one covered with a lid and the second left uncovered as
less, and be accurate within 0.1% of the test mass at any point
described in 9.4.3 and 9.4.4.
within the range of use for this test.
5.4 Tamper, non-absorptive, smooth and rigid rod 120 to NOTE 2—The data from the control slabs are to be used as references
representing the best and worst conditions. If, for example, the test
150mm(5to6in.)longhavingacrosssectionof13by25mm
indicates a given curing material under evaluation is not effective but the
(0.5 by 1 in.).
test result is not significantly different from that of the sample covered
5.5 Screed, 25-mm (1-in.) diameter, rigid rod, 200 to 300
with a lid, this would imply that something is wrong with the test. On the
mm (8 to 12 in.) long.
other hand, if a curing material is found to be effective but the test result
5.6 Moist Cabinet or Room, as specified in Specification
is similar to that of the uncovered sample, this would indicate that the
C511.
storage environment during curing did not cause sufficient drying.
5.7 Brush, with soft bristles of nylon or other suitable
9. Procedure
material for removing laitance from the test slabs.
5.8 Drilling Machine, with a 25-mm (1-in.) inside diameter
9.1 Proportioning and Mixing Mortar:
water cooled diamond-core drill bit.
9.1.1 Proportioning—Determine the proportions of cement
5.9 Diamond Blade Saw, low speed (300 rpm maximum)
and sand by adding dry sand to a cement paste having a
with 100-mm (4-in.) diameter blade.
water-cement ratio of 0.44 so as to produce a flow of 65 6 5.
5.10 Desiccator, vacuum, large enough to accomodate the
Perform the flow test in accordance with Test Method C87
test specimens.
using 10 drops in 6 s.
5.11 Vacuum Pump, of sufficient capacity to maintain an
absolute pressure of approximately 2500 Pa or less (133 NOTE 3—It is recommended that a trial batch be made to determine the
mix proportions needed to achieve the required flow.
Pa=mm Hg). An aspirator may be sufficient.
9.1.2 Mixing—Mix the mortar at room temperature, prefer-
6. Reagents and Materials
ably 23 6 1.7°C (73.4 6 3°F) with a relative humidity of 40
6.1 Cement and Sand—Portland cement meeting Type I of
to60%.Mixthemortarasfollows:placethecementandwater
Specification C150 and graded standard sand conforming to
in the mixer and allow the cement to absorb water for 1 min
Specification C778.
and then mix for 1 min.Add the sand to the paste and mix for
6.2 Methanol and Ethanol—The alcohols used for dehy-
2 min.
drating the cores and cooling the saw blade shall initially
9.1.2.1 The mortar temperature, when determined immedi-
contain <1% water.
ately after mixing, shall be 23 6 1.7°C (73.4 6 3°F).
9.2 Molding Test Slabs—Placethemortarinamoldinthree
7. Test Environment
approximately equal layers and tamp each layer 75 times with
7.1 The environment in which the molds containing the test
the tamper. The third layer of mortar shall be of sufficient
slabsarekeptduringthecuringperiodshallbedescribedbyits
quantity to overfill the mold.After the third layer of mortar is
temperature, relative humidity, and wind velocity, and the rate
tamped, fill the indentations made by the tamping by gently
ofevaporationfromafree-watersurfaceshallbegiveninterms
pressingdownthemortarusingthetamperturnedonitssideso
of rate of evaporation of water per unit surface area. The
that the 13 by 120 to 150-mm (0.5 by 5 to 6-in.) surface is in
minimum rate of evaporation shall be 0.4 kg/m /h.
contactwiththemortar.Presstheentiresurfacedown18times
NOTE 1—Theminimumrequiredrateofevaporationcanbeobtainedby
withthetamper,movingalongthelongdimensionofthemold.
using a var
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