In June 2003, two construction companies, Shimizu Construction Co., Ltd. and Takenaka Public Works Co., Ltd. mixed polypropylene fiber into cement to increase the fire resistance of the concrete, thereby saving construction costs and shortening the construction period.
It is reported that the length of the polypropylene fiber uniformly mixed in the cement is 5 mm to 20 mm in length and accounts for 0.1% to 0.35% of the volume of the concrete. In the event of a fire, the fiber melts due to high temperatures and forms small voids in the interior of the concrete. This becomes a passage through which water expands in the concrete after expansion, thus avoiding the damaging effects of thermal expansion on the concrete. This concrete was placed in an experiment at a high temperature of 1000 degrees Celsius for two hours and showed good fire resistance.
Today's concrete buildings use spray-resistant fire-retardant paints to enhance fire resistance. The coating thickness is 3 cm to 5 cm. The new technology saves this process, making the refractory treatment cost less than the original 10%, shortening the construction period accordingly, and expanding the internal use space of the building. Polypropylene fiber mixing does not require special equipment and construction techniques.
The two companies plan to apply this technology to high-rise residential buildings soon.
It is reported that the length of the polypropylene fiber uniformly mixed in the cement is 5 mm to 20 mm in length and accounts for 0.1% to 0.35% of the volume of the concrete. In the event of a fire, the fiber melts due to high temperatures and forms small voids in the interior of the concrete. This becomes a passage through which water expands in the concrete after expansion, thus avoiding the damaging effects of thermal expansion on the concrete. This concrete was placed in an experiment at a high temperature of 1000 degrees Celsius for two hours and showed good fire resistance.
Today's concrete buildings use spray-resistant fire-retardant paints to enhance fire resistance. The coating thickness is 3 cm to 5 cm. The new technology saves this process, making the refractory treatment cost less than the original 10%, shortening the construction period accordingly, and expanding the internal use space of the building. Polypropylene fiber mixing does not require special equipment and construction techniques.
The two companies plan to apply this technology to high-rise residential buildings soon.
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