铸造旧砂制备免烧砖及经济性分析

利用东风汽车公司十堰铸造基地排放的铸造旧砂制备了免烧免蒸砖,水泥加入量控制在3%以下,自然养护2 8d的抗压强度达到15MPa以上,符合蒸压灰砂国家标准(GB1194 5 - 1999)规定的优等品MU15级的要求。通过成本核算,铸造旧砂免烧砖标砖的生产成本能够控制在0 .10元块以下,具有较好的经济性。

PREPARATION OF BRICK FROM USED SAND IN CASTING PROCESS AND ITS ECONOMIC ANALYSIS

Investigations have been carried out into development of bricks from used casting sand in Shiyan Casting Base of Dongfeng Automoblie Company.The study reveals that the good quality bricks can be produced with the addition of cement less than 3 wt%.The compressive strength over 15 MPa have been obtained after 28 days curing at ambient conditions.The bricks reach the standard of MU15 high quality products (GB11945-1999).According to the cost-benefit analysis,the cost of a brick of 240 mm×115 mm×53 mm can be controlled under RMB 0.1 yuan.The results show that the bricks from used sand have good economic benefits.