砂性弃土制备免烧砖试验研究

Preparation and Properties of Unfired Brick by Waste Sandy Soil

以工程砂性弃土为主要原料,通过振动成型制备免烧砖。以试件7 d、28 d和56 d抗压强度为控制指标,研究水泥、粉煤灰、石膏等无机结合材料配合比对免烧砖性能的影响。试验结果表明,砂性弃土免烧砖最佳配合比为:砂性弃土72%、水泥16%、粉煤灰8%、石膏2%、石灰2%和减水剂0.5%。采用最佳配合比所制砂性弃土免烧砖28 d抗压强度、劈裂抗拉强度和软化强度分别达15.8 MPa、1.8 MPa和15.3 MPa。砂性弃土免烧砖各项性能满足JC/T422-2007《非烧结垃圾尾矿砖》MU15标准要求。研究可为工程砂性弃土的开发利用提供一种技术途径。

Waste sandy soil in engineeringwas used as main raw material to prepare unfired brick by vibrating forming. The 7 d, 28 d and 56 d compressive strength were tested to determinethe influence of the mixing ratio of inorganic bonded materials such as cement, fly ash, gypsum, etc. on the performance of this unfired brick. The result show that the best mixing ratio ofthis unfired brick is 72% of waste sandy soil, 16% of cement,8% of fly ash,2% of gypsum,2% of lime and 0.5% of water reducing agent. The compressive,tensile and softening strength of the unfired brickat 28 d reach 15.8 MPa, 1.8 MPa and 15. 3 MPa respectively. The performance of the unfired brickis in conformity with the requirements of JC/ T422-2007MU15 standard. The study providesa technical approach for the high efficient comprehensive utilization ofwaste sandy soil.