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Method for manufacturing roadbed material
Provided is a method for easily producing a roadbed material from which hexavalent chromium does not readily elute, using, as a raw material, a crushed product of a hardened cementitious material containing hexavalent chromium. A method for producing a roadbed material, which comprises a carbonation step for carbonating a crushed product of a hardened cementitious material containing hexavalent chromium using a carbon dioxide-containing gas having a temperature of 50-140 DEG C and a water content of 1.5% or more, to obtain a roadbed material in which hexavalent chromium is less likely to elute than before the treatment. It is preferable that the production method comprises, prior to the carbonation treatment step, a crushing step for crushing the hardened cementitious body containing hexavalent chromium to obtain a crushed product containing 50% by mass or more of a crushed product having a particle size of 100 mm or less and 1% by mass or more of a crushed product having a particle size of 2.36 mm or less.
本发明提供用于以包含六价铬的水泥质硬化体的破碎物作为原料，简易地制造六价铬不容易溶出的路基材料的方法。一种路基材料的制造方法，其包括下述碳酸化处理工序：对包含六价铬的水泥质硬化体的破碎物，使用具有50～140℃的温度且水含量为1.5％以上的含有二氧化碳的气体进行碳酸化处理，得到与该处理前相比六价铬不容易溶出的路基材料。该制造方法优选在碳酸化处理工序之前包括下述破碎工序：对包含六价铬的水泥质硬化体进行破碎，得到以50质量％以上的比例包含粒度为100mm以下的破碎物、并且以1质量％以上的比例包含粒度为2.36mm以下的破碎物的破碎物。
Method for manufacturing roadbed material
Provided is a method for easily producing a roadbed material from which hexavalent chromium does not readily elute, using, as a raw material, a crushed product of a hardened cementitious material containing hexavalent chromium. A method for producing a roadbed material, which comprises a carbonation step for carbonating a crushed product of a hardened cementitious material containing hexavalent chromium using a carbon dioxide-containing gas having a temperature of 50-140 DEG C and a water content of 1.5% or more, to obtain a roadbed material in which hexavalent chromium is less likely to elute than before the treatment. It is preferable that the production method comprises, prior to the carbonation treatment step, a crushing step for crushing the hardened cementitious body containing hexavalent chromium to obtain a crushed product containing 50% by mass or more of a crushed product having a particle size of 100 mm or less and 1% by mass or more of a crushed product having a particle size of 2.36 mm or less.
本发明提供用于以包含六价铬的水泥质硬化体的破碎物作为原料，简易地制造六价铬不容易溶出的路基材料的方法。一种路基材料的制造方法，其包括下述碳酸化处理工序：对包含六价铬的水泥质硬化体的破碎物，使用具有50～140℃的温度且水含量为1.5％以上的含有二氧化碳的气体进行碳酸化处理，得到与该处理前相比六价铬不容易溶出的路基材料。该制造方法优选在碳酸化处理工序之前包括下述破碎工序：对包含六价铬的水泥质硬化体进行破碎，得到以50质量％以上的比例包含粒度为100mm以下的破碎物、并且以1质量％以上的比例包含粒度为2.36mm以下的破碎物的破碎物。
Method for manufacturing roadbed material
路基材料的制造方法
NOZAKI TAKATO (author) / FUKUOKA AOI (author) / ICHITSUBO KOUKI (author) / HAYAKAWA TAKAYUKI (author) / NOGUCHI TAKAFUMI (author) / WANG TIANCHAO (author)
2023-11-07
Patent
Electronic Resource
Chinese
IPC:
E01C
Bau von Straßen, Sportplätzen oder dgl., Decken dafür
,
CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE
MANUFACTURING METHOD OF SLAG ROADBED MATERIAL AND ITS SLAG ROADBED MATERIAL
| European Patent Office | 2022
| European Patent Office | 2019