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今年2月下旬,我所与厅属材料实验厂配合协作,进行了用隧道干燥室干燥承重空心砖坯的试验。制空心砖所用粘土,不含粒径大于0.25mm 的粗颗粒;粒径为0.25～0.05mm 的仅占3～14%,而0.05～0.01mm 的占33～39%,0.01～0.005mm 的占16～24%,小于0.005mm 的占30～45%。塑性指数一般在20～23.4%,掺入粒径3mm 以下的煤渣粉20%(按体积比)后,塑性指数降至17%左右,临界含水率为9.5%。粘土经化学分析,SiO_2占66～68%,Al_2O_3 16～17%,:Fe_2O_3 5～6%,CaO1～1.5%,MgO1.5～2%,烧失量4～5%。在试验室条件下,用高
In late February of this year, the Institute cooperated with the Institute of Materials and Materials Experiments to dry the load-bearing hollow bricks in a tunnel drying chamber. The clay used for making hollow bricks does not contain coarse particles larger than 0.25 mm; only 3 to 14% of the particle size is 0.25 to 0.05 mm, and 33 to 39% is 0.05 to 0.01 mm, and the proportion is 0.01 to 0.005 mm. ~ 24%, 30 ~ 45% less than 0.005mm. The plasticity index is generally between 20 and 23.4%. After blending 20% of the cinder powder with a particle size of less than 3mm (by volume), the plasticity index is reduced to about 17%, and the critical moisture content is 9.5%. According to the chemical analysis of clay, SiO 2 accounted for 66 to 68%, Al 2 O 3 to 16 to 17%,: Fe 2 O 3 to 5 to 6%, CaO 1 to 1.5%, MgO 1.5 to 2%, and loss on ignition 4 to 5%. In laboratory conditions, with high