（1）相同加热方式下，温度越高，试件的外观形貌劣化程度越严重，主要表现为裂缝尺寸和数量均有所增长，当温度为800 ℃时，试件甚至出现局部爆裂及边缘脱落。相同温度下，与马弗炉加热相比，微波辐射加热对试件外观形貌的损伤程度更大。
（2）随着温度的升高，不同加热方式下试件的抗压强度均降低。其中，微波辐射加热试件的抗压强度在各相邻温度区间内的下降速率大致一样；马弗炉加热在25~300 ℃间的抗压强度降幅较小，此后随着温度继续增加，试件的抗压强度下降明显。相同温度下，与马弗炉加热相比，微波辐射加热试件的抗压强度均较小。
（3）随着温度的升高，试件在不同加热方式下的波速、相对波速均减小，损伤度均增大。相同温度下，与马弗炉加热相比，微波辐射加热试件的波速、相对波速均较小，损伤度均较大。防辐射混凝土的相对波速和损伤度与相对抗压强度的相关性均较好（R2均大于0.960 0），说明相对波速和损伤度可较为准确地反映高温下防辐射混凝土的抗压性能。
（4）当试块厚度相同时，随着温度的升高，试件在不同加热方式下的γ射线计数变化均很小，线性衰减系数降低，平均自由程和半值层厚度均增大。相同温度下，随着试块厚度的增加，γ射线计数降低，线性衰减系数、平均自由程和半值层厚度均变化不大。与微波辐射加热相比，马弗炉加热下，试件的屏蔽性能参数随温度升高的变化速率及变化幅度均相对较小。
 

[1] SHARIFI S,BAGHERI R,SHIRMARDI S P.Comparison of shielding properties for ordinary, barite, serpentine and steel-magnetite concretes using MCNP-4C code and available experimental results[J].Annals of Nuclear Energy,2013,53:529-534.
[2] RASHID R S M,SALEM S M,AZREEN N M,et al．Effect of elevated temperature to radiation shielding of ultra-high performance concrete with silica sand or magnetite[J]．Construction and Building Materials,2020,262:120567．
[3] DEMIR F,BUDAK G,SAHIN R,et al.Determination of radiation attenuation coefficients of heavyweight- and normal-weight concretes containing colemanite and barite for 0.663 MeV γ-rays[J].Annals of Nuclear Energy,2011,38(6):1274-1278.
[4] AKKURT I,BASYIGIT C,KILINCARSLAN S,et al.Radiation shielding of concretes containing different aggregates[J].Cement Concrete Composites,2006,28(2):153-157.
[5] OTO B,G?譈R A,KAVAZ E,et al.Determination of gamma and fast neutron shielding parameters of magnetite concretes[J].Progress in Nuclear Energy,2016,92:71-80.
[6] SAYYED M I,MAHMOUD K A,ISLAM S,et al.Application of the MCNP 5 code to simulate the shielding features of concrete samples with different aggregates[J].Radiation Physics and Chemistry,2020,174:108925.
[7] KHAN M U,AHMAD S,NAQVI A A,et al．Shielding performance of heavy-weight ultra-high-performance concrete against nuclear radiation[J].Progress in Nuclear Energy,2020,130:103550.
[8] KUBISSA W,GLINICKI M A,DABROWSKI M.Permeability testing of radiation shielding concrete manufactured at industrial scale[J].Materials Structures,2018,51(4):1-15.
[9] AZREEN N M,RASHID R S M,HANIZA M,et al.Radiation shielding of ultra-high-performance concrete with silica sand, amang and lead glass[J].Construction and Building Materials, 2018,172:370-377.
[10] LEE S Y,DAUGHERTY A M,BROTON D J.Assessing aggregates for radiation-shielding concrete[J].Concrete international,2013,35(5):31-38.
[11] LIU H L,SHI J J,QU H Q,et al.Feasibility of using recycled CRT funnel glass as partial replacement of high density magnetite sand in radiation shielding concrete[J].Transactions of Nonferrous Metals Society of China,2019,29(4):831-839.
[12] 李国刚,毕春梅.防核辐射混凝土高温稳定性能试验研究[J].混凝土,2011(8):48-50.
[13] SAKR K,EL-HAKIM E.Effect of high temperature or fire on heavy weight concrete properties[J].Cement Concrete Research,2005,35(3):590-596.

[14] 陈振富,蔡双阳,陶秋旺,等.铅锌尾矿砂混凝土抗压强度及屏蔽性能试验研究[J].混凝土,2021(2):68-71,76.
[15] 石建军,丁德馨,栗建新,等.废弃阴极射线管玻璃对重晶石混凝土性能的影响[J].建筑材料学报,2016,19(2):369-372.
[16] 王萍,王福川.防辐射混凝土的试验研究[J].建筑材料学报,2000(2):182-186.
[17] 吴运超,金祖权,张宇.核电牺牲混凝土高温及火灾损伤研究[J].河北工业大学学报,2014,43(6):73-76.
[18] OUDA A S.Development of high-performance heavy density concrete using different aggregates for gamma-ray shielding[J].Progress in Nuclear Energy,2015,79:48-55.
[19] AHMAD I,SHAHZDAD K,AHMADM I,et al.Densification of concrete using barite as fine aggregate and its effect on concrete mechanical and radiation shielding properties[J].Journal of Engineering Research,2019,7(4):81-95.
[20] LEE C M, LEE Y H, LEE K J.Cracking effect on gamma-ray shielding performance in concrete structure[J].Progress in Nuclear Energy,2007,49(4):303-312.

王若祥，陈振富，陶秋旺,等.不同加热方式下高温后防辐射混凝土的性能研究[J].混凝土与水泥制品,2024(3):79-83,89.

WANG R X,CHEN Z F,TAO Q W,et al.Study on properties of radiation shielding concrete after high temperature under different heating modes[J].China Concrete and Cement Products,2024(3):79-83,89.