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High strength polymer-modified repair cementitious composite for fire protection
This study evaluated the mechanical performance and fire resistance of high strength polymer-modified cementitious composite to test its ability to provide safety and adequate repairs in concrete tunnel structures. The findings are summarised below. At 28 days, the high strength polymer-modified cementitious composite exhibited compressive strength, flexural strength, and bond strength of at least 40 MPa, 5 MPa, and 1.5 MPa, respectively. A MIP analysis of water tightness indicated that the high strength polymer-modified cementitious composite exhibited excellent water tightness with small void volumes compared to commercial fire-resistant products. These results were attribute to the compact internal matrix, which increased the strength. No spalling appeared in the high strength polymer-modified cementitious composite after the fire-resistance test because its air permeability (the ability to release steam, gas, and heat) increased as its void volume expanded. The maximum temperature taken 20 mm from the high strength polymer-modified cementitious composite surface reached 469.6 deg C. In addition, the internal temperatures taken at 40, 60, and 80 mm continuously increased even as the amount of heat supplied declined during a RABT time-temperature heating curve. Causes include a long transfer time and a heat island effect because the expanded perlite had a high specific heat and the cementitious composite had a low thermal conductivity. Measurements of the internal temperatures of high strength polymer-modified cementitious composite with cover thicknesses of 20, 40, and 60 mm indicate that increased cover thickness results in lower internal temperatures. Concrete strength tends to diminish significantly if it is heated to more than 400 deg C, so the high strength polymer-modified cementitious composite cover thickness shouldbe at least 40 mm to preserve safety in existing concrete tunnel structures.
High strength polymer-modified repair cementitious composite for fire protection
This study evaluated the mechanical performance and fire resistance of high strength polymer-modified cementitious composite to test its ability to provide safety and adequate repairs in concrete tunnel structures. The findings are summarised below. At 28 days, the high strength polymer-modified cementitious composite exhibited compressive strength, flexural strength, and bond strength of at least 40 MPa, 5 MPa, and 1.5 MPa, respectively. A MIP analysis of water tightness indicated that the high strength polymer-modified cementitious composite exhibited excellent water tightness with small void volumes compared to commercial fire-resistant products. These results were attribute to the compact internal matrix, which increased the strength. No spalling appeared in the high strength polymer-modified cementitious composite after the fire-resistance test because its air permeability (the ability to release steam, gas, and heat) increased as its void volume expanded. The maximum temperature taken 20 mm from the high strength polymer-modified cementitious composite surface reached 469.6 deg C. In addition, the internal temperatures taken at 40, 60, and 80 mm continuously increased even as the amount of heat supplied declined during a RABT time-temperature heating curve. Causes include a long transfer time and a heat island effect because the expanded perlite had a high specific heat and the cementitious composite had a low thermal conductivity. Measurements of the internal temperatures of high strength polymer-modified cementitious composite with cover thicknesses of 20, 40, and 60 mm indicate that increased cover thickness results in lower internal temperatures. Concrete strength tends to diminish significantly if it is heated to more than 400 deg C, so the high strength polymer-modified cementitious composite cover thickness shouldbe at least 40 mm to preserve safety in existing concrete tunnel structures.
High strength polymer-modified repair cementitious composite for fire protection
Hochfester, mit Polymer modifizierter, zementhaltiger Reparaturverbundwerkstoff für der Feuerschutz
Won, Jong-Pil (author) / Choi, Seok-Won (author) / Park, Chan-Gi (author)
Polymers and Polymer Composites ; 15 ; 379-388
2007
10 Seiten, 10 Bilder, 8 Tabellen, 13 Quellen
Article (Journal)
English
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