Research On Manufacture Of Shale Lightweight Aggregate And Application Of Concrete Fire Door Board

The fire door can keep good fire-resistant stability, integrity and meetinsulation requirements within a certain time in fire accidents, mainly installed atfirewall openings, stairwell entrances and exits, evacuation corridors, pipelinewellhead, etc.,. Usually, the fire door is opened for staff passage, and it is closed toprevent the spreading of fire and flue gas to provide a safety passageway for firevictims. In recent years, the number of high-rise buildings increased dramatically,such as large shopping malls, hotels, restaurants, etc, and fire accidents occurred inhigh-rise building, which would bring people huge economic losses and pose lifethreats. As a result, fire doors of high quality draw more researchers’ attention.As so far, fire doors of poor quality occupying main market are filled up withsilicate aluminum wool, rock wool and glass wool, which will bring dust pollutionand serious harm to people’s health. The new version of GB12955-2008“fire door "says that filling material must be environmentally friendly and have a good quality offire-resistant. Therefore, research of lightweight, environmentally friendly, highlyfire-resistant new fire door is inevitable.The fire door core is the key structure of the fire doors, which directly affects thequality of the fire doors. Therefore, the emphasis of this study is to product light,environmental protection, fire resistance of lightweight aggregate concrete fire doorcore, which is based on shale lightweight aggregate, cement as a cementing material,using the production process of lightweight aggregate concrete.Firstly, the expansion of raw materials when sintered was analyzed, whichmainly depended on the chemical composition analysis, Mineral composition analysis,and thermogravimetric-differential thermal analysis (TG-DSC) analysis. Secondly,the firing process of the lightweight aggregate was explored, which contained burningtemperature, heating rate, and holding time. The results show that the best lightweightaggregate can be obtained when the shale was sintered at1240℃, along with aheating rate of13°C/min and a holding time of20min. This process was tested inceramics factory respectively, both in Henan and Hunan. Produced lightweightaggregate was inspected by building materials quality inspection department in Hunan.The results show that its density grade is400kg/m3, compressive strength andsoftening coefficient is respectively400kg/m3, more than1.0MPa and more than0.8. Besides, they are no radioactive. Almost every performance index required is met.Finally, a series of lightweight aggregate concrete board of different ideal density,such as600kg/m3,700kg/m3,800kg/m3,900kg/m3,1000kg/m3were prepared in themethod of pre-packed aggregate grouting. After the degree of fire resistance,compressive strength and refractoriness were analyzed, we finally draw a conclusionthat when water cement ratio is within1.0~1.2, the value of the block density andcompressive strength is within700~900kg/m3and2.5~7MPa respectively, andrefractory degrees reached2h, which have met all requirements. Therefore, they canbe used as ideal blocks for fire door panel.This paper chooses shale lightweight aggregate produced as filler to fabricatefire doors, which provides some certain reference for producing new fire doors oflightweight, environmentally friendly, highly fire-resistant.