【摘要】：為了探究不同摻量的凝灰?guī)r石粉、VF防裂劑對水泥漿體收縮性能的影響及機理,測定了不同凝灰?guī)r石粉和VF防裂劑摻量的化學收縮和干燥收縮,采用X射線衍射技術(XRD)研究不同齡期的復合水泥漿體水化產(chǎn)物,并采用壓汞法(MIP)研究其孔結構。結果表明:凝灰?guī)r石粉早期不參與水化,等量取代水泥后通過減少水泥熟料數(shù)量減少水泥漿體的化學收縮,并能填充較大孔隙,增大水泥漿體中較小毛細孔(孔徑50 nm以下)所占的比例,使水泥基材料干縮變大;VF防裂劑中的明礬石和石膏與水泥水化過程中析出的Ca(OH)2反應生成膨脹性鈣礬石補償收縮,并填充較小孔隙,減少漿體中較小毛細孔所占的比例,從而減小干縮。凝灰?guī)r石粉中活性成分在VF防裂劑的化學激發(fā)下二次反應加劇,復摻石粉和防裂劑的水泥漿體的化學收縮顯著減少,生成的水化產(chǎn)物填充孔隙,明顯的抑制石粉對漿體干燥收縮的增大效應。
[Abstract]:In order to investigate the effect and mechanism of VF anticracking agent on shrinkage of cement paste with different amount of tuff powder, the chemical shrinkage and dry shrinkage of different amount of tuff powder and VF anticracking agent were determined. The hydration products of composite cement paste at different ages were studied by X-ray diffraction (XRD) and the pore structure was studied by (MIP). The results show that tuff powder does not participate in hydration at the early stage, and the chemical shrinkage of cement paste can be reduced by reducing the quantity of cement clinker, and the larger pores can be filled after the same amount of cement is replaced. By increasing the proportion of smaller pores (pore size less than 50 nm) in cement paste, the dry shrinkage of cement-based materials becomes larger. Alunite and gypsum in VF anti-cracking agent react with Ca (OH) _ 2 precipitated during hydration of cement to form expansive ettringite to compensate shrinkage and fill in smaller pores to reduce the proportion of smaller capillary pores in slurry and thus reduce dry shrinkage. The secondary reaction of the active components in the tuff powder increased under the chemical excitation of the VF anti-cracking agent, the chemical shrinkage of the cement paste mixed with the stone powder and the anti-cracking agent decreased significantly, and the hydration products filled the pores. The increasing effect of stone powder on drying shrinkage of slurry was obviously inhibited.
【作者單位】： 河海大學力學與材料學院;水資源高效利用與工程安全國家工程研究中心;
【基金】：國家科技支撐計劃資助(2015BAB07B04) 中央高校業(yè)務費(2016B04514)
【分類號】：TU528

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