【摘要】 研究了超细石灰石粉水泥基胶凝材料需水量、力学性能,从电阻率和X射线衍射试验分析了超细石灰石粉水泥浆体水化初期结构形成机理。结果表明,石灰石粉掺量35%时,与未掺加石灰石粉基准试样相比,需水量随石灰石粉细度的增加呈先降低后增加的峰谷式变化;超细石灰石粉掺量对水泥基胶凝材料力学性能影响表现为早期强度在低掺量下增加2.7%—4.4%,掺量增加,强度降低4.7%—35.0%;超细石灰石粉能够改善水泥基材料柔韧性,不同细度石灰石粉在掺量5%、15%、35%时28 d压折比均小于未掺加石灰石粉的基准试样5.2;超细石灰石粉掺入胶凝材料中在水化进行600 min前能够促进水泥水化,电阻率高于未掺加石灰石粉基准试样,而后,其电阻率的增长远小于未掺加石灰石粉基准试样;超细石灰石粉的掺入能和水泥基材料中的铝相反应生成比硫铝酸盐更加稳定的碳铝酸盐。更多还原

【Abstract】 Ratio of water demand and mechanical properties of cement-based material containing ultra-fine limestone powder were researched,and mechanism of structure formation during hydration at early age was analyzed by means of electronic resistivity and X-ray diffraction of paste.Results show that ratio of water demand of cement-based material with the increase of different mesh 35% limestone powder first decreases and then increases compared with cement-based material without any limestone powder.The influence to mechanical properties of cement-based material at early performance with low content increase from 2.7%—4.4%,and decrease from 4.7%—35.0% with high content.Furthermore ultra-fine limestone powder can improve the brittleness of cement-based material.Ratio of compressive strength to flexible strength of cement-based material without any of limestone powder at 28 d is 5.2 more then those adding 5%、15%、35% limestone powder to cement-based material.During hydration in 600 min,ultra-fine limestone powder can accelerate the hydration rate,so electronic resistivity of cement paste is higher than that without limestone powder.When hydrating after 600 min,electronic resistivity of cement pastes with ultra-fine limestone powder increases far slowly than that without limestone powder.Additional,ultra-fine limestone powder in cement paste can react with aluminates to form calcium aluminates monocarbonate which is more stable then calcium aluminates.更多还原