注浆封孔材料的性能及其膨胀机理研究

注浆加固巷道围岩是矿山支护的新技术之一,钻孔封堵材料是注浆加固技术研究的一个重点。本文介绍了一种以高铝水泥、石灰、石膏等为主体材料的速凝高强膨胀性封孔材料,测定了该材料的凝结时间、膨胀率和强度等特性并对其膨胀机理进行了探索。结果表明,所研制的速凝高强膨胀性封孔材料凝结时间适当、膨胀率较大、强度较高,能够满足矿山注浆加固封孔的要求。材料的膨胀机理在于水化产物钙矾石具有较小的晶体尺寸并呈放射状分布。

Properties and Swelling Mechanism of Hole Sealing Material

Grouting to reinforce the surrounding rock is a new technology in coal mine supporting.The hole sealing material is a key to grouting.In this paper,properties such as setting time,swelling rate and strength of a new hole sealing material which was fabricated using high alumina cement,lime,gypsum and additives are studied.The swelling mechanism of this material is probed experimentally.The results show that the newly developed sealing material has desired setting time,high strength and large swelling rate,which can meet the demand of mine reinforcing.Furthermore,the swelling mechanism is due to the main hydration product – ettringite,which has a small crystal size and has a radial distribution in the hydrated structure.