STUDY ON PREPARATION PROCESS AND PROPERTIES OF HIGH HYDROGEN CONTENT CONCRETE FOR NEUTRON SHIELDING

摘要

A series of concrete samples with high hydrogen content were prepared by pressing process with aluminum hydroxide, boron carbide and aluminate cement as raw materials, the mechanical performance of the shielding material was examined by flexural strength tester and compression strength tester. Thermogravimetric analyzer was used to test the weight loss performance of the shielding material, hydrated cement and Al(OH)_3. The thermal stability of the concrete at working temperature were investigated by bake the samples at 210°C for 90 hours and at 300°C for 5 hours. The shielding performance against neutron from (241)~Am-Be source were examined by neutron penetration tests. The test results show that the mechanical properties of the shielding material decrease with the increase of the content of aluminum hydroxide, the compression strength of the shielding material reached above 10MPa. The decomposition temperature of cone is 220 °C, the weight loss curve tends to be plateau after baking at 210°C for 20 hours. Most of the crystal water lost after holding at 300 °C for 5 hours, but the dimensions of the samples show no obvious change. The shielding performance of the material against neutron from (241)~Am-Be source is comparable to that of lead-boron polyethylene.