利用酸洗污泥制备蒸压灰砂砖的探究

关键字：利用,酸洗,污泥,制备,蒸压,灰砂,砖,的,探究,

（江苏省建筑科学研究院有限公司，江苏 南京  210008）

摘要：利用生石灰、磨细江砂、江砂和工业污泥为原料，研究生产MU15级蒸压灰砂砖的配合比和最佳成型压力。结果表明：原料的配比为m（生石灰）:m（磨细江砂）:m（江砂）:m（工业污泥）=25:15:45:15，成型压力为17 MPa；同时蒸压工艺采用：升温2 h、恒温

6 h、自然降温3 h、蒸压温度180 ℃、蒸压压力接近1 MPa，所制备的蒸压灰砂砖抗折强度平均可达到3.9 MPa，抗压强度平均可达到17.4 MPa，其性能符合GB 11945—1999《蒸压灰砂砖》中MU15级蒸压灰砂砖的强度要求。

关键词：蒸压；灰砂砖；配合比；强度；蒸压工艺

中图分类号：TU522.1+9        文献标识码：A        文章编号：1001-702X（2018）11-0104-04

 

Study on preparation of autoclaved lime sand brick by pickling sludge

PENG Xiaoyi，XU Guodong，SUN Zhenghua

（Jiangsu Research Institute of Building Science Co. Ltd.，Nanjing 210008，China）

Abstract：In this paper，using lime，ground river sand，river sand，and industrial sludge as raw materials，we explore the mixture ratio and the best molding pressure to produce autoclaved lime sand brick of MU15. Research shows that，the mass ratio of raw materials is lime:ground river sand：river sand: industrial sludge=25:15:45:15，molding pressure is 17 MPa and autoclave technology adopt: temperature rise 2 h，constant temperature 6 h，natural cooling down 3 h，autoclave temperature 180 ℃，autoclave pressure close to 1 MPa. The average flexural strength and compressive strength of the prepared autoclaved sand-lime brick can reach 3.9 MPa and 17.4 MPa，respectively，whose performance is in line with MU15-level autoclaved sand-lime brick strength requirements in standard "Autoclaved lime-sand brick"（GB 11945—1999）.

Key words：autoclaved，lime sand brick，mixture ratio，strength，autoclaved technology