臺灣博碩士論文加值系統

輕質混凝土由於質輕,若使用在高層結構物上,可降低結構物之重量,減輕
地震力的作用,另外還具有良好的耐火性能.由於近年來許多建築物火災,
造成不少的傷亡及財產損失,故本研究主要目的乃在探討輕質骨材混凝土
之耐火性能,並與一般常重混凝土比較.本文之研究主要針對不同比重骨材
混凝土依ASTM E119 標準昇溫曲線加溫三小時至1052℃,冷卻後放置至不
同時間之殘餘強度恢復,重量變化,動彈性模數,超音波波速之變化情形,及
加溫過程中混凝土內部各點之溫度變化情形,另外還量測混凝土之熱膨脹
係數及不同溫度時之極限熱應變量,由所得結果可知,混凝土受火害後產生
之裂縫,隨著所用骨材比重的降低,裂縫則較少,且較不明顯,而火害後之混
凝土抗壓強度,動彈性模數,超音波波速,則有相同的趨勢,即骨才比重越
低,受高溫後之折減越少,另外輕質骨材混凝土之熱應變量,熱膨脹係數,熱
傳導均較一般常重混凝土為低,由此顯示輕質骨材混凝土之耐火性能均較
常重骨材混凝土為佳.故若應用於房屋結構上應可有效減低火災發生時之
傷害.

If the light-weight concrete is used in building a high rise
,it can reduce building''sweight because of its weight is
lighter than the normal-weight concrete,and reduce the process
of earthquake corresponding.On the other side,its fire proof
properties are better than the normal-weight concrete.In these
years,fire damage made great losses of life and money,if we
want to employ the light-weight concrete to building structure,
it is necessary to research its thermal properties in the
process of a fire. The research has different aggregates of
four specific gravity in making concrete,heated with ASTM E119
standard fire temperature-time relation to 1052 ℃,measure
their surplus strength,weight,dynamic elastic modulus,
ultrasonic velocity after cooling,temperature-time relation in
concrete interior during heating,and concrete''s extreme thermal
expansion strain, thermal expansion cofficient. With the result
that we can see the thermal properties of the light-weight
concrete after a fire are better than the normal-weight
concrete,so if a construction is built in the light-weight
concrete,it can reduce fire damage effectively.