Influence of the Sulfate Level in the Clinker Phase on the Performance of Superplasticized Concretes

SP-179: Fourth CANMET/ACI/JCI Conference: Advances in Concrete Technology Pub Date : 1998-06-01 DOI:10.14359/6044

L. Coppola, R. Troli, P. Zaffaroni, M. Collepardi

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引用次数: 6

Abstract

Portland cement contains sulfur compounds from the clinker phase and from added calcium sulfate (e.g., gypsum) which acts as a set regulator. The purpose of this investigation was to study the influence of the sulfate content in the clinker phase on the performance of superplasticized concrete mixtures in terms of initial slump level at a given water-cement ratio (0.45), slump-loss rate, and compressive strength at early and later ages. Two batches (A and B) of clinker from the same kiln source were studied, the main difference being the content of sulfate (SO3) in the clinker (0.72% and 1.40%, respectively). Different percentages of natural gypsum, as wet regulator, were interground in a laboratory mill to manufacture portland cements: A1, A2, A3 from clinker A, and B1, B2, B3 from clinker B. Three levels of total sulfate content in terms of SO3 were set: 3.0% in portland cements A1 and B1; 3.5% in portland cements A2 and B2; 4.0% in portland cements A3 and B3. At a given sulfate content in portland cement, the lower the clinker sulfate content, the more effective is the slump increase of the concrete caused by the superplasticizer addition. Moreover, the lower is the clinker sulfate content, the lower is the slump-loss rate of the superplasticized concrete mixture. Finally, at a given water-cement ratio, there is a reduction in the compressive strength at early ages (

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熟料相硫酸盐含量对超塑混凝土性能的影响

波特兰水泥含有来自熟料相和添加的硫酸钙(如石膏)的硫化合物，硫酸钙作为固定调节剂。本研究的目的是研究熟料阶段硫酸盐含量对超塑混凝土混合料在给定水灰比(0.45)下的初始坍落度、坍落损失率和早期和后期抗压强度的影响。以同一窑源的A、B两批熟料为研究对象，其主要差异在于熟料中硫酸盐(SO3)的含量(分别为0.72%和1.40%)。将不同比例的天然石膏作为湿调节剂，在实验室磨磨机中研磨制成硅酸盐水泥:熟料a中的A1、A2、A3和熟料b中的B1、B2、B3。以SO3计，硫酸盐总含量设定为三个水平:硅酸盐水泥A1和B1中SO3含量为3.0%;在硅酸盐水泥A2和B2中占3.5%;在硅酸盐水泥A3和B3中为4.0%。在硅酸盐水泥中一定的硫酸盐含量下，熟料硫酸盐含量越低，掺减水剂对混凝土坍落度的提高效果越好。此外，熟料硫酸盐含量越低，超塑混凝土的坍落损失率越低。最后，在水灰比一定的情况下，低硫酸盐熟料用于制造硅酸盐水泥时，其早期抗压强度(

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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SP-179: Fourth CANMET/ACI/JCI Conference: Advances in Concrete Technology

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