摘要
采用大掺量矿物掺合料(Supplementary Cementitious Materials,SCMs)制备的海水海砂混凝土(Seawater Sea-sand Concrete,SSC)可以缓解陆地资源短缺,减少碳排放,但大掺量SCMs制备的SSC的微观物相和微观结构演变机制仍不明确。本文研究了大掺量SCMs和水胶比对SSC抗压强度、物相和微观结构的影响,结果表明:大掺量矿物掺合料混凝土的早期抗压强度低于纯硅酸盐水泥混凝土,当龄期为28 d时,大掺量矿物掺合料混凝土的抗压强度比纯硅酸盐水泥混凝土的抗压强度提高了4.6 MPa;大掺量矿物掺合料净浆试样28 d龄期的XRD图谱中未观察到弗里德尔盐的特征峰,且氢氧化钙衍射特征峰几乎消失;28 d龄期时,在相同水胶比条件下,大掺量矿物掺合料砂浆试样的孔隙率(7.58%)低于纯硅酸盐水泥砂浆试样的孔隙率(8.87%)。
Although seawater sea-sand concrete(SSC)prepared with high-volume supplementary cementitious materials(SCMs)can alleviate terrestrial resource shortages and reduce carbon emissions,the evolution mechanisms of its microscopic phases and microstructure remain unclear.This study investigates the effects of high-volume SCMs and water-to-binder ratio on the compressive strength,phase composition,and microstructure of SSC.The results show that,the early-age compressive strength of high-volume supplementary cementitious materials concrete is lower than that of ordinary Portland cement concrete.However,at 28 days,the compressive strength of high-volume supplementary cementitious materials concrete exceeds that of ordinary Portland cement concrete by 4.6 MPa.The XRD patterns of the high-volume supplementary cementitious materials paste samples at 28 days shows no characteristic peaks of Friedel's salt,with the calcium hydroxide diffraction peaks nearly absent.At the same binder-to-water ratio and 28 days,the porosity of high-volume supplementary cementitious materials mortar samples(7.58%)is lower than that of ordinary Portland cement mortar samples(8.87%).
出处
《混凝土世界》
2025年第6期22-26,共5页
China Concrete
关键词
海水海砂混凝土
矿物掺合料
物相
微观结构
Seawater sea-sand concrete
supplementary cementitious materials
phase composition
microstructure
