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NATIONAL BUREAU OF STANDARDS REPORT

EVALUATION OF REFRACTORY QUALITIES OF

CONCRETES FOR JET AIRCRAFT WARM-UP, POWER CHECK

MAINTENANCE APRONS, AND RUNWAYS

by

J „ V. Ryan, E. C. Tuma , and W. N. Bet turn

8342 V

Quarterly Report

on

U. S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
The National Bureau of Standards is a principal focal point in the Federal Government for assuring

maximum application of the physical and engineering sciences to the advancement of technology in industry and commerce. Its responsibilities include development and maintenance of the national stand- ards of measurement, and the provisions of means for making measurements consistent with those standards; determination of physical constants and properties of materials; development of methods

for testing materials, mechanisms, and structures, and making such tests as may be necessary, particular!) for government agencies; cooperation in the establishment of standard practices for incorporation in codes and specifications; advisory service to government agencies on scientific and technical problems; invention and development of devices to serve special needs of the Government; assistance

to industry, business, and consumers in the development and acceptance of commercial standards and

simplified trade practice recommendations; administration of programs in cooperation with United

States business groups and' standards organizations for the development of international standards of

practice; and maintenance of a clearinghouse for the collection and dissemination of scientific, technical, and engineering information. The scope of the Bureau’s activities is suggested in the following

listing of its four Institutes and their organizational units. Institute for Basic Standards. Electricity. Metrology. Heat. Radiation Physics. Mechanics. Applied Mathematics. Atomic Physics. Physical Chemistry. Laboratory Astrophysics.* Radio Standards Laboratory: Radio Standards Physics; Radio Standards Engineering.** Office of Standard Ref- erence Data. Institute for Materials Research. Analytical Chemistry. Polymers. Metallurgy. Inorganic Materials. Reactor Radiations. Cryogenics.** Office of Standard Reference Materials. Central Radio Propagation Laboratory.** Ionosphere Research and Propagation. Troposphere

and Space Telecommunications. Radio Systems. Upper Atmosphere and Space Physics.

Institute for Applied Technology. Textiles and Apparel Technology Center. Building Research.

Industrial Equipment. Information Technology. Performance Test Development. Instrumentation.

Transport Systems. Office of Technical Services. Office of Weights and Measures. Office of Engineering Standards. Office of Industrial Services.

* NBS Group, Joint Institute for Laboratory Astrophysics at the University of Colorado. ** Located at Boulder, Colorado.
NATIONAL BUREAU OF STANDARDS REPORT

NBS PROJECT

1002-12-10472 April 28, 1964

NBS REPORT

8342

Quarterly Report

on EVALUATION OF REFRACTORY QUALITIES

of

CONCRETES FOR JET AIRCRAFT WARM-UP, POWER CHECK

MAINTENANCE APRONS, AND RUNWAYS

by

J. V. Ryan, E. C „ Tuma and W. N. Bet turn

Fire Research Section

Building Research Division

Sponsored by:

U. S. Department of the Navy

Bureau of Yards and Docks

Reference: Task Y-F015-15-102

NBS File No. 10.02/10472

NATIONAL BUREAU OF S

for use within the Government, and review. For this reason, t whole or in part, is not autln Bureau of Standards, Washing

the Report has been specificall

IMPORTANT NOTICE

. . ess accounting documents intended Approved ror public release by the s subjected to additional evaluation Director of the National Institute of e listing of this Report' either in t u i he 0ffice of the Director, National

- Technology (NIST) iy the Government agency for which on October 9, 2015. copies for its own use.

U. S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS

2

3.1 Vacuum Drying

The blast furnace slag aggregate and the Volcanite aggregate con- crete specimens were removed from the vacuum chamber after 121 days at

pressures below the vapor pressure of water. On the basis of measurements of electrical resistance, the specimens had reached a state of

dryness equivalent to that obtained by thorough oven drying. The BF-2

specimens were broken in flexure, and compressive strength measurements

were made on some of the beam ends. The results are given in Table 1.

These data, plus those in NBS Reports 7878 and 8118, indicate that low

pressure drying of concrete test specimens may be used, in place of oven drying, without significant effect on the strength of the concrete

However, the cited data are somewhat limited and the above conclusion

should be recognized as at best tentative.

3.2 Minimal Conditioning

In an attempt to determine the combination of fog room and oven

drying times required to develop both strength and jet resistance, two

sets of specimens were prepared, conditioned, and tested. The first

set consisted of six 12 in. diameter by 6 in. thick cylindrical specimens; the second set the same as the first plus nine 3 by 4 x 16 in.

beams. The cylindrical specimens were instrumented with themocouples

at surface, 1/8 in., 1/4 in., 3/8 in., 1/2 in., and with pressure

probe tubes at 1/2 in. depth. All the specimens in each set were put

in the fog room as soon as the forms were stripped. At fourteen days,

three cylinders, and for the second set three beams, were put in an oven heated to about 100°C. The first set (Di-4) was oven dried

fourteen days, the second (Di-5) seven days. At the end of the oven

drying, all six cylindrical specimens of each set were exposed to the

jet impingement test. The beam specimens were broken in flexure and

compressive strength measurements made on the beam ends. The results

are given in Table 2.

Both sets of specimens were made of diabase aggregate concretes

nominally identical to that of Di-1 described in NBS Report 7578.

Additional sets will be made for other conditioning programs or with

other aggregates.

Table 1. Effect of Conditioning at Vacuum (approx, vapor pressure of

water) vs. Air Drying at One Atmosphere. Specimens of BF-2

Concrete

Modulus of rupture, psi 980

Compressive strength, psi 10310

Moisture content after, percent 1.0

Table 2. Results From Specimens After Short Conditioning Periods.

Oven Dried _ _ a/Fog Room—

Spall Max Spall Max

Volume Pressure Volume Pressure

12" x 6 " cc psi 12" x 6" cc psi

Di-4—

1 0 40 2 120 162

3 0 14 4 184 112

5 0 0 6 200 220

Avg 0 18 Avg 168 165

Di-5—7

1 0 42 2 176 83

3 0 60 4 178 20

5 0 96 6 160 288

Avg 0 66 Avg 171 130

SJ Kept in fog room until same age as duplicates oven-dried. ~ Fog room to 14 days, oven dried to 28 days, tested. — Fog room to 14 days, oven dried to 21 days, tested.

Table 3. Supplementary Tests on Specimens After Short Conditioning

PeriodsDi-5 Concrete.

Modulus of Compressive Moisture

Concretes RupturePsi Strength, psi Content

Avg Ma x Avg Max Avg Max

Oven Dried 765 880 7950 8125 0 0

73°F/507o RH 645 700 8550 8690 4.60 4.75

Fog Room 960 1005 8830 9380 5.75 6.10

USCOMM-NBS-DC