西安建筑科技大学学报(自然科学版)

以机械活化超细矿渣粉为主要原料、以石膏和硫铝酸盐水泥熟料(SAC)为辅料,制备海洋环境混凝土用无机防腐剂,利用三元云分析、SEM、XRD研究方法研究其防腐性能和防腐机理.研究结果表明:该多元复合无机防腐剂凝结时间、膨胀率、耐蚀系数等指标均满足标准要求; 掺入该无机防腐剂的普通混凝土在硫酸盐侵蚀150次循环后,耐蚀系数仍高于75%,达到KS150级; 防腐剂的加入有助于水化初期钙矾石(AFt)的生成,并抑制其在水化后期向低硫型钙矾石(AFm)的转化,同时消耗腐蚀原料,并生成多种凝胶体填充晶体骨架的空隙,增加了混凝土微结构的致密性,进而提高混凝土的耐蚀性能,从微观角度为矿渣粉在抗硫酸盐腐蚀中的应用提供理论参考.

The paper, inorganic preservatives for marine environmental concrete are prepared by using the activated ultrafine slag powder as the main raw material, gypsum and sulphur aluminate cement(SAC)as supplementary materials. The corrosion resistance and mechanism of inorganic preservatives are studied by means of ternary cloud analysis, SEM and XRD. The results show that the setting time, expansion rate and corrosion resistance coefficient of the composite inorganic preservative are consistent with the standard requirements. The corrosion resistance coefficient of ordinary concrete mixed with the inorganic preservative is higher than 75% after 150 cycles of sulfate corrosion. The addition of preservatives is helpful to the formation of calcium vanadium stone in the early stage of hydration and inhibits the late conversion to low sulfur calcium vanadium. At the same time, the corrosion raw materials are consumed and the various of gels are generated to fill the voids of cement paste, increasing compactness of the concrete microstructure. In addition, the research results provide a theoretical reference for the application of slag powder in sulfate corrosion resistance at the microscopic level.

引言
1 实验
2 结果与讨论
3 结论

表1 各原料矿物成分XRF分析/%<br/>Tab.1 XRF analysis of mineral composition of each raw material

表1 各原料矿物成分XRF分析/%
Tab.1 XRF analysis of mineral composition of each raw material

表2 多元复合粉体配比/%<br/>Tab.2 Multiple composite powder ratio

表2 多元复合粉体配比/%
Tab.2 Multiple composite powder ratio

图1 复合防腐剂不同指标与体系组成的云分析<br/>Fig.1 Test of different indicators and systems of composite powders

图1 复合防腐剂不同指标与体系组成的云分析
Fig.1 Test of different indicators and systems of composite powders

图2 多元复合粉体的体系配合比分布图<br/>Fig.2 Distribution map with multiple composite powder system

图2 多元复合粉体的体系配合比分布图
Fig.2 Distribution map with multiple composite powder system

图3 复合防腐剂制备混凝土抗压强度云分析<br/>Fig.3 Compressive strength test of concrete prepared by composite powders

图3 复合防腐剂制备混凝土抗压强度云分析
Fig.3 Compressive strength test of concrete prepared by composite powders

图4 复合防腐剂制备混凝土等碳化深度云分析<br/>Fig.4 Carbonization test of concrete prepared by composite powders

图4 复合防腐剂制备混凝土等碳化深度云分析
Fig.4 Carbonization test of concrete prepared by composite powders

图5 复合防腐剂制备混凝土Cl-扩散系数云分析<br/>Fig.5 Cl- diffusion coefficient of concrete prepared by composite powders

图5 复合防腐剂制备混凝土Cl-扩散系数云分析
Fig.5 Cl- diffusion coefficient of concrete prepared by composite powders

图6 复合防腐剂制备混凝土抗压强度耐蚀系数云分析<br/>Fig.6 Coefficient of corrosion resistance analysis of concrete prepared by composite powder

图6 复合防腐剂制备混凝土抗压强度耐蚀系数云分析
Fig.6 Coefficient of corrosion resistance analysis of concrete prepared by composite powder

图7 复合粉体防腐机理分析<br/>Fig.7 Anticorrosive mechanism for composite excitation group

图7 复合粉体防腐机理分析
Fig.7 Anticorrosive mechanism for composite excitation group

图8 硫酸钠溶液浸泡28个循环K试样及A21试样的SEM微观形态扫描<br/>Fig.8 SEM picture of the sample K and sample A21 after sulfate solution 28 cycle

图8 硫酸钠溶液浸泡28个循环K试样及A21试样的SEM微观形态扫描
Fig.8 SEM picture of the sample K and sample A21 after sulfate solution 28 cycle

图9 复合防腐剂XRD图谱<br/>Fig.9 XRD pattern of composite powder

图9 复合防腐剂XRD图谱
Fig.9 XRD pattern of composite powder

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备注

引言

1 实验

2 结果与讨论

3 结论

期刊信息