Experimental Study on the Thermal-Mechanical Properties and Degradation of Sleeve Grouting Material at Elevated Temperatures

Experimental study on thermal performance of ultra-high performance concrete with coarse aggregates at high temperature

“…Thermal expansion of the sample is recorded continuously by an electronic dial indicator. can be found in the literature [31]. The steel shield outside the sample in the heating chamber is to make the sample heated more evenly, which reduces concrete bursting, and for safety protection.…”

“…´- Figure 8 shows the thermal conductivity curves of Kodur [14,38] , Zheng [10] , Yu [31] , EC2 [8] and ASCE [9] for UHPC, RPC, Grout, HSC, NSC and this paper for comparisons. As can be seen from the figure, in general, thermal conductivity decreases as temperature increases.…”

“…( 14) with the test values (Figure 5(b)), which shows that they are well correlated and is within a ±5% error band. The mass ratios of UHPC [14] , RPC [10] , Grout [31] , HSC [38] , NSC [8] and CA-UHPC are shown in Figure 10.…”

“…Heat capacity can be expressed as the product of specific heat and density. The high-temperature heat capacity curves of Kodur [14,38] , Zheng [10] , Yu [31] , EC2 [8] , ASCE [9] and this paper are plotted in Figure 12. It can be seen that the trend of the heat capacity curve of CA-UHPC is similar to that of NSC and HSC, and the peak value of CA-UHPC at 700℃ is close to that of HSC.…”

“…( 20) with the experimental values (Figure 5(d)) in Figure 13, it can be seen that except the large deviation of the value at 50°C, the calculation curve is well consistent with the experimental curve. The high-temperature thermal expansion curves of Kodur [14,38] , Yu [31] , EC2 [8] , ASCE [9] and this paper are plotted in Figure 14. As a whole, thermal expansion increases with the increase of temperature.…”