【摘要】 以甲酸钙、硫酸铁及晶胚为主要组分,应用正交设计方法安排试验,配制了无碱早强剂,其组成比例为4∶5∶3(甲酸钙∶晶胚∶硫酸铁)。对该早强剂早强效果进行了检验,受检混凝土比基准混凝土的1 d、3 d、7 d及28 d强度提高分别为54%、47%、39%、31%。利用XRD方法分析了掺加该早强剂的水泥水化产物组成,对水泥石中未水化的C3S及C2S与氢氧化钙、钙矾石数量进行对比。在此基础上,结合早强剂中各组分作用,进一步分析了该早强剂的早强作用机理。更多还原

【Abstract】 The alkali-free concrete hardening accelerator,with the elements of Calcium formate,Ferric sulfate and Crystal-embryo,was confected by means of orthogonal design,and the composite ratio of the accelerator was 4∶5∶3(Calcium formate∶ Crystal-embryo∶ Ferric sulfate).The hardening accelerative effect of the accelerator was examined,and the findings showed that,compared with the control concrete sample,the 1 d,3 d,7 d and 28 d compressive strength of the tested concrete had been enhanced by 54%,47%,39% and 31%,respectively.BY means of XRD,the composition of the hardened cement paste was researched;in addition,the quantitative ratio of the un-hydrated C3S & C2S to Ca(0H)2 & C3A·3CaSO4·32H2O contained in the hardened cement paste was tested.Considering both the current results and the effect of every component of the accelerator,the mechanism of the concrete early strength was further explored.更多还原