矿渣MTC固化体性能的研究

Study on the performances of slag cement

MTC固井技术在提高固井质量、降低固井成本和保护环境等方面显示出了优越性。对矿渣MTC固化体的性能进行了实验研究。在高炉水淬矿渣MTC浆中加入硅粉,使Ca/Si比例控制在0.6-1.0范围内,防止转化为α-C2SH,并随着温度的提高,分别生成耐高温的雪硅钙石(C5S6H5)、硬硅钙石(C6S6H)等,从而提高固化体的热稳定性,具有好的抗高温性能;在矿渣MTC固井技术中,Cl-能与矿渣中的部分离子形成比NaCl结构更强的结晶体,成为MTC固化体的一部分,具有较强的抗盐性;在不同酸浓度下,矿渣MTC固化体的酸溶率均比水泥石低;后期强度高,抗打击性好;渗透性比水泥石小。

MTC cementing technology has many advantages over improving cementing quality, cutting down cost and pollution control. By adding silicon powder in the furnace slag MTC slurry, and controlling the ratio of Ca/Si within 0. 6-1. 0, two high-temperature resistant compositions as C5S6H5 and C6S6H thus can be formed with the rising of temperature. This improves the thermal stability of slag cement and makes it possesses better high temperature tolerance. In the MTC cementing technology , Cl- may react with some ions and form crystals with stronger structure than NaCl, and this improves the salt resistance of the slag cement. In addition, it has lower acid solution rate than the conventional cement, while it has higher later strength and lower permeability.