高炉镍铁渣粉在水泥基复合胶凝材料中的水化特性研究

通过对不同高炉镍铁渣掺量的水泥-高炉镍铁渣粉复合胶凝材料水化放热速率、高炉镍铁渣粉的反应程度、硬化浆体化学结合水含量以及水化产物中C-S-H凝胶Ca/Si的测定,分别研究了水泥-高炉镍铁渣粉复合胶凝材料的早期、中长期水化进程、浆体微观形貌以及水化产物特点等水化特性.研究结果表明:高炉镍铁渣的掺入会降低水化放热速率,并推迟水化加速期放热峰的出现时间;在复合胶凝体系中,随着高炉镍铁渣粉掺量的增大,其反应程度和硬化浆体中化学结合水含量将降低.复合胶凝材料水化生成的C-S-H凝胶的Ca/Si低于水泥,且随着水化的进行呈降低趋势;高炉镍铁渣粉中的Al,在水化过程中会取代部分Si进入C-S-H凝胶中,形成C-A-S-H凝胶.

Hydration Characteristics of Blast Furnace Ferronickel Slag Powder in Cement-based Complex Binder

The hydration characteristics of blast furnace ferronickel slag powder ( BFFN ) in complex binder at different powder ratios were investigated via measurements of exothermic rate , reaction degree of powder , content of chemical bonding water , mole radio of Ca to Si of formed silicate calcium hydrate ( C-S-H) gel and the hydration characteristics of cement-BFFN composite cementitious material were studied including early , medium and long term hydration processes and microstructure .The results show that the mix of BFFN leads to the decrease of exothermic rate and delay the occurrence point-in-time of hydration exothermic peak .In cement-BFFN complex binder , the reaction degree of BFFN and the content of chemical bonding water decrease with the increase of ratio of BFFN .The mole ratio of Ca to Si of formed silicate calcium hydrate in cement-BFFN complex binder lower than cement , and the Ca/Si decreases with the increase of hydration time .In the hydration process , the Al contained in BFFN will form calcium silicoaluminate hydrate ( C-A-S-H) gel by replacing Si of silicate calcium hydrate ( C-S-H) gel.