Development of an Admixture for Self-Leveling Concrete

S. Rols, J. Ambroise, J. Pera
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引用次数: 7

Abstract

In the past decade, many efforts have been undertaken to develop highly-workable concrete which consolidates under its own weight without any vibration, specially in Japan. The admixtures used in such concrete are mainly composed of high water reducing superplasticizers, fine limestone dust and viscosity agents to maintain not only high flowability but high segregation resistance of the concrete. The water to cement ratio is generally lower than 0.55. A new admixture is proposed in the present study. It is a mixture of a superplasticizer and an accelerator with plasticizing properties which also acts as a viscosity agent. The composition of the self-leveling concrete is as follows. The total amount of fine materials (cement + fly ash or cement + ground limestone) is 370kg/m^3, while the cement content (normal portland cement CEMI 52.5) is 260kg/m^3. The water to cement ratio is 0.73. The mechanical performances of the hardened concrete is better than those of a usual French building concrete. The compressive strengths at 16 hrs, 7 days, and 28 days are 8, 30, and 3 MPa, respectively. The unrestrained drying shrinkage reaches 600 to 700mm/m, at 90 days as predicted from the 28 day results.
自流平混凝土掺合料的研制
在过去的十年中,特别是在日本,人们已经做出了许多努力来开发高可用性混凝土,这种混凝土在自身重量下无任何振动而固化。这种混凝土的外加剂主要由高减水剂、细灰岩粉尘和粘滞剂组成,既能保持混凝土的高流动性,又能保持混凝土的高抗离析性。水灰比一般小于0.55。本文提出了一种新的掺合料。它是一种高效减水剂和促进剂的混合物,具有增塑性,也可作为粘滞剂。自流平混凝土的组成如下:细料(水泥+粉煤灰或水泥+磨砂石灰石)总量为370kg/m^3,水泥(普通硅酸盐水泥CEMI 52.5)含量为260kg/m^3。水灰比为0.73。硬化混凝土的力学性能优于法国常用的建筑混凝土。16 h、7 d和28 d的抗压强度分别为8、30和3 MPa。根据28天的试验结果,在90天时,无约束的干燥收缩率达到600 ~ 700mm/m。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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