Abstract
| Original language | English |
|---|---|
| Journal | Materials and Structures |
| Volume | 30 |
| Issue number | 7 |
| Pages (from-to) | 394-398 |
| ISSN | 1359-5997 |
| Publication status | Published - 1997 |
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Porosity and liquid absorption of cement paste. / Krus, M.; Hansen, Kurt Kielsgaard; Kunzel, H. M.
In: Materials and Structures, Vol. 30, No. 7, 1997, p. 394-398.Research output: Contribution to journal › Journal article › Research › peer-review
TY - JOUR
T1 - Porosity and liquid absorption of cement paste
AU - Krus, M.
AU - Hansen, Kurt Kielsgaard
AU - Kunzel, H. M.
PY - 1997
Y1 - 1997
N2 - The moisture behaviour of building materials exposed to the natural climate is largely dependent on their water absorption. In contrast to most building stones, cementitious materials like concrete do not exhibit a water absorption that is proportional to the square root of time. There must be a slowing-down effect which is related to water because the absorption of organic liquids, such as hexane, is quite normal. Measurements of the porosity of hardened cement paste determined by helium pycnometry and water saturation show that water molecules can enter spaces in the microstructure which are not accessible to the smaller helium atoms. Considering the results of dilatation tests both before and after water and hexane saturation, it seems possible that a contraction of capillary pores due to moisture-related swelling of the cement gel leads to the non-linear water absorption over the square root of time.
AB - The moisture behaviour of building materials exposed to the natural climate is largely dependent on their water absorption. In contrast to most building stones, cementitious materials like concrete do not exhibit a water absorption that is proportional to the square root of time. There must be a slowing-down effect which is related to water because the absorption of organic liquids, such as hexane, is quite normal. Measurements of the porosity of hardened cement paste determined by helium pycnometry and water saturation show that water molecules can enter spaces in the microstructure which are not accessible to the smaller helium atoms. Considering the results of dilatation tests both before and after water and hexane saturation, it seems possible that a contraction of capillary pores due to moisture-related swelling of the cement gel leads to the non-linear water absorption over the square root of time.
M3 - Journal article
VL - 30
SP - 394
EP - 398
JO - Materials and Structures
JF - Materials and Structures
SN - 1359-5997
IS - 7
ER -