添加超细天然沸石改善自固结混凝土的流变性能

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology Pub Date : 2025-03-01 DOI:10.1016/j.powtec.2025.120868

J.J. Chen , G.X. Guan

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引用次数: 0

摘要

高填料密度是提供自固结混凝土（SCC）优越流变性能的必要条件。超细天然沸石（SNZ）是由天然沸石磨成比水泥更细的粒径，可以填补水泥颗粒之间的空隙，提高充填密度。为研究SNZ对混凝土流变性能的影响及其流变性能变化对流动性的影响，制备了28种不同SNZ掺量、不同膏体体积的混凝土配合比，测试了屈服应力、表观粘度、假塑性指数、坍落度和流速。量化了屈服应力和表观粘度对SNZ混凝土流动性的影响。为了揭示SNZ对混凝土流变性能和流动性影响的原因，测量了混凝土配合料的充填密度和膜厚的变化。结果表明，SNZ对浆料流变性能的影响取决于SNZ含量和浆料体积。SNZ通过薄膜厚度影响流动性，进而影响流变性能，并主要通过堆积密度影响假塑性指数。添加10% SNZ可提高材料的强度，降低屈服应力和表观黏度，轻微提高材料的假塑性指数。综上所述，SNZ具有改善高强度SCC流变性能的潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Addition of superfine natural zeolite to improve rheological properties of self-consolidating concrete

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Addition of superfine natural zeolite to improve rheological properties of self-consolidating concrete

A high packing density is essential to provide self-consolidating concrete (SCC) superior rheological performance. The superfine natural zeolite (SNZ), ground from natural zeolite to have a size finer than cement, can fill the voids between cement grains for packing density improvement. To evaluate the effect of SNZ on rheological properties and the effect of this change in rheological properties on flowability, a total of 28 concrete mixes with different SNZ contents at different paste volume were produced to test yield stress, apparent viscosity, pseudoplastic index, slump-flow and flow rate. The roles of yield stress and apparent viscosity on flowability of SNZ concrete were quantified. And, to reveal the causes of these effects of SNZ on rheological properties and flowability, the changes in packing density and film thicknesses of the concrete mixes were measured. The results disclosed that the effect of SNZ on rheological properties was dependent on the SNZ content and the paste volume. The SNZ affected the flowability through film thicknesses and consequently through rheological properties, and affected the pseudoplastic index mainly through packing density. Addition of 10 % SNZ increased the strength, decreased yield stress and apparent viscosity and slightly increased pseudoplastic index. It is concluded that SNZ has a potential to improve rheological properties to produce high-strength SCC.

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来源期刊

Powder Technology 工程技术-工程：化工

CiteScore

9.90

自引率

15.40%

发文量

1047

审稿时长

46 days

期刊介绍： Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests: Formation and synthesis of particles by precipitation and other methods. Modification of particles by agglomeration, coating, comminution and attrition. Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces). Packing, failure, flow and permeability of assemblies of particles. Particle-particle interactions and suspension rheology. Handling and processing operations such as slurry flow, fluidization, pneumatic conveying. Interactions between particles and their environment, including delivery of particulate products to the body. Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters. For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.