Page 99 - UL_Report On_Part 1

89 IITGN-UL/Façade 90 IITGN-UL/Façade

(d) Role of POP and cement boards in providing (v) Role of masonry in providing fire protection
fire protection to deck slab
Masonry enclosures were provided for fire protection to columns and brick infill walls were provided as
Fire protection to deck slab was provided in the similar partition walls between the compartments (Refer Part I (4c)). Significant spalling of masonry plaster was
double layer fashion of POP sheets and cement boards observed at certain locations exposing masonry to direct fire exposure. Spalling during fire occurs when water
as in Test 1. Cement boards of 18mm thickness were vapor is driven off from cement paste during heating, with high pore pressures resulting in increase of tensile
fixed at 8’’ c/c spacing and were found in intact form at stresses. Spalling had resulted due to high moisture content of the plaster, rapid rates of heating and high
all levels. Since fire load at each floor level was lesser as stresses at time of heating.
compared to other tests, cement boards performed
well. Local failure above locations of wooden crib was
observed.

Image 35: Spalling of masonry plaster Image 36: Spalling of plaster observed in masonry
Image 34: Intact cement boards at first floor level observed in partition walls enclosures around steel columns