TY - BOOK
T1 - Concrete under arctic conditions
AU - Kivekäs, Lauri
AU - Huovinen, Seppo
AU - Leivo, Markku
PY - 1985
Y1 - 1985
N2 - In the research, strength and deformation properties of
concrete under very wide temperature variations were
studied, particularly chances in the compressive strength
and modulus of elasticity of various concretes. These
chances were studied by testing air-entrained concretes,
non-air-entrained concretes and concretes containing
hollow plastic microspheres, which were cured under
differing moisture conditions at temperatures ranging
from +20 °C to -70 °C. The compressive strength increased
with rising moisture content and decreasing temperature,
whereas the modulus of elasticity harelip chanted with a
temperature drop to -20 °C, although it increased at
lower temperatures.
The freezing strength of concrete was examined using a
freezing temperature of -65 °C. In the tests, 5MPa proved
to be a safe value of the freezing strength.
The frost-resistance of concrete was tested at
temperatures ranging from +20 °C to -65 °C. At these
temperatures the concretes without air-entrainment
suffered damage more rapidly than in tests carried out at
temperatures ranging from +20 °C to -20 °C, The
air-entrained concretes did not lose their strength, on
the other hand the concrete with hollow microspheres and
non-air-entrained concretes suffered damage equally
early.
The hardening of concrete at a temperature of -10 °C and
the effect on this of the precuring period, when
different anti-freeze admixtures are used, was studied
experimentally. The most promising admixture combinations
were NaNO2 + Na2SO4, NaNO2 + CaCl2, K2CO3 + a retarder,
and Ca(NO3)2 + Na2SO4.
Test on hollow-core slabs for cold brittleness at -30 °C
were carried out and their complete maintenance of impact
ductility was verified.
AB - In the research, strength and deformation properties of
concrete under very wide temperature variations were
studied, particularly chances in the compressive strength
and modulus of elasticity of various concretes. These
chances were studied by testing air-entrained concretes,
non-air-entrained concretes and concretes containing
hollow plastic microspheres, which were cured under
differing moisture conditions at temperatures ranging
from +20 °C to -70 °C. The compressive strength increased
with rising moisture content and decreasing temperature,
whereas the modulus of elasticity harelip chanted with a
temperature drop to -20 °C, although it increased at
lower temperatures.
The freezing strength of concrete was examined using a
freezing temperature of -65 °C. In the tests, 5MPa proved
to be a safe value of the freezing strength.
The frost-resistance of concrete was tested at
temperatures ranging from +20 °C to -65 °C. At these
temperatures the concretes without air-entrainment
suffered damage more rapidly than in tests carried out at
temperatures ranging from +20 °C to -20 °C, The
air-entrained concretes did not lose their strength, on
the other hand the concrete with hollow microspheres and
non-air-entrained concretes suffered damage equally
early.
The hardening of concrete at a temperature of -10 °C and
the effect on this of the precuring period, when
different anti-freeze admixtures are used, was studied
experimentally. The most promising admixture combinations
were NaNO2 + Na2SO4, NaNO2 + CaCl2, K2CO3 + a retarder,
and Ca(NO3)2 + Na2SO4.
Test on hollow-core slabs for cold brittleness at -30 °C
were carried out and their complete maintenance of impact
ductility was verified.
KW - arctic regions
KW - construction
KW - cold weather construction
KW - materials
KW - arctic conditions
KW - concrete
M3 - Report
SN - 951-38-2256-7
T3 - Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports
BT - Concrete under arctic conditions
PB - VTT Technical Research Centre of Finland
CY - Espoo
ER -