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为提升粗骨料超高性能混凝土(CA-UHPC)的流变与物相稳定性能，研究了硅灰、粗骨料和纤维用量对CA-UHPC流变性能的影响规律；建立了流变参数、纤维、骨料分布间的关系。结果表明：CA-UHPC呈剪切变稀行为，Modified bingham模型具有更准确的流变参数拟合结果，测试流动度宜控制在450～690mm。增加硅灰用量，屈服应力增大而黏度减小，剪切变稀现象弱化；增加粗骨料用量，屈服应力和黏度先降低后增加，剪切变稀现象加剧；增加钢纤维掺量，屈服应力和黏度均增加，并加剧了剪切变稀现象。硬化后试件从上至下，纤维分布减少，而骨料分布增多。粗骨料的整体均匀分散程度随骨料用量的增加而提升，但纤维会劣化粗骨料的均匀分散程度，且随纤维掺量增加，纤维和粗骨料均匀分布程度先升高后降低。
Abstract：In order to improve the rheology and stability of ultra-high performance concrete containing coarse aggregate(CA-UHPC),the effects of silica fume, coarse aggregate, and steel fiber contents on the rheological properties of CA-UHPC were investigated, and the relationship among the rheological parameters, fiber, and coarse aggregate distribution was established. The results show that CA-UHPC usually exhibits a shear-thinning behavior. The modified Bingham model has more accurate fitting results of rheological parameters, and the fluidity required for the rheological properties test can be controlled at 450-690 mm. Increasing the silica fume content increases the yield stress, decreases the viscosity, and weakens the shear-thinning behavior. Increasing the coarse aggregate content firstly decreases and then increases the yield stress and viscosity, and intensifies the shear-thinning behavior. And increasing the steel fiber content increases the yield stress and viscosity, and intensifies the shear-thinning behavior. The number of steel fiber decreases from the top to the bottom of samples, while the proportion of coarse aggregate increases. The uniform dispersion degree of coarse aggregate increases with the increase of coarse aggregate content, but steel fibers deteriorate the uniform dispersion degree of coarse aggregate. The uniform distribution degree of steel fiber and coarse aggregate firstly increases and then decreases with the increase of steel fibers content.
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基本信息:
DOI：10.14062/j.issn.0454-5648.20220254
中图分类号:TU528
引用信息:
[1]郑晓博,韩方玉,刘建忠,等.粗骨料超高性能混凝土流变与稳定性[J].硅酸盐学报,2022,50(11):2844-2854.DOI:10.14062/j.issn.0454-5648.20220254.
基金信息:
国家自然科学基金(51978318);国家自然科学基金青年基金(52008191);国家自然科学基金(51978246)
2022-10-12
2022-10-12
2022-10-12