HCSA膨胀剂掺量对高强自密实混凝土性能影响研究

发布时间：2018-05-12 22:03

本文选题：高强自密实混凝土 + HCSA膨胀剂　；参考：《武汉大学学报(工学版)》2017年01期

【摘要】：设计制作5种HCSA膨胀剂掺量的高强自密实混凝土试块,通过混凝土工作性、抗压强度和自由膨胀率以及在钢管约束条件下混凝土自应力值测试,研究HCSA膨胀剂掺量对高强自密实混凝土性能的影响.结果表明:掺入膨胀剂对混凝土工作性影响较小;随膨胀剂掺量增加,混凝土自由膨胀率逐渐增大,而28d抗压强度则快速下降;膨胀剂水化主要集中在混凝土硬化早龄期,自由膨胀变形于12~15d范围内达到稳定.在钢管约束条件下,混凝土膨胀稳定滞后,且当膨胀剂掺量为8%~12%,混凝土膨胀稳定时自应力值达3.2~3.7 MPa.最后,基于试验与理论分析结果,建立钢管约束条件下混凝土限制膨胀模型及自应力值计算公式,计算结果与试验结果吻合较好,可供工程设计参考.
[Abstract]:Five kinds of high strength self-compacting concrete with HCSA expansion agent were designed and made. The workability, compressive strength and free expansion rate of concrete and the self-stress value of concrete under the constraint of steel pipe were measured. The effect of the content of HCSA expansion agent on the properties of high strength self-compacting concrete was studied. The results show that the influence of expansive agent on the workability of concrete is small, the free expansion ratio of concrete increases gradually with the increase of the amount of expansive agent, and the compressive strength of concrete decreases rapidly at 28 days, and the hydration of expansive agent is mainly concentrated in the early age of concrete hardening. The free expansion deformation is stable in the range of 12 ~ 15 days. Under the confined condition of steel pipe, the expansion stability of concrete lags behind, and when the amount of expansive agent is 8 / 12, the self-stress value of concrete is 3.2g / 3.7 MPa. Finally, based on the experimental and theoretical analysis results, the concrete confined expansion model and the calculation formula of the self-stress value under the constraint condition of steel pipe are established. The calculated results are in good agreement with the experimental results, which can be used as a reference for engineering design.
【作者单位】：武汉大学土木建筑工程学院;中建商品混凝土有限公司;
【基金】：国家自然科学基金资助项目(编号:51278388)
【分类号】：TU528

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