Abstract:  Experiments were carried out to study the fire-resistance performance of cross-laminated timber （CLT） floor under non-loading conditions, by using a fire-resistance furnace and the standard fire curve. The tested specimens consisted of 5 layers of CLT laminates, with a thickness of 35 mm for each layer and an overall thickness of 175 mm. The temperature profiles at different depths within the CLT specimens, charring depths and charring rates were obtained in the tests. The effect of different types of adhesives on delamination and charring rate were also studied and analyzed. The test results show that the fire insulation and integrity of the tested floor specimens were not less than 2.00 h. For specimens using ordinary PUR adhesive, the first layer delaminated at about 58~69 minutes, and the second layer delaminated at about 110~113 minutes. The charring rates of the specimens were higher than the nominal charring rate given in Eurocode 5. For the specimen using heat-resistant PUR adhesive, there was no obvious layer delamination being observed. The charting rate remained respectively constant.

Key words: Key words: cross-laminated timber （CLT）, fire-resistance performance, charring rate, adhesive, layer delamination