The meta-kaolinite content of the calcined clay source impacts the mechanical and durability performance of blended Portland concrete

IF 10.9 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement and Concrete Research Pub Date : 2025-05-10 DOI:10.1016/j.cemconres.2025.107922

Yuvaraj Dhandapani , Kirthika Kala Subramanian , Fragkoulis Kanavaris , Leon Black , Susan A. Bernal

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Abstract

This study evaluated the mechanical and durability performance of CEM I and CEM I plus limestone blended concrete produced with calcined clays (CC) with a varying meta-kaolinite content (70, 50 or 20 wt%). Results revealed that concrete with >45 MPa can be produced with a CC with only 20 wt% meta-kaolinite. Increased compressive and flexural strengths were obtained using higher meta-kaolinite content CC. Limestone addition did not significantly change the concretes' transport or durability properties when compared to binary mixes, despite the reduced clinker factor. CC-containing concretes exhibited excellent chloride resistance, but reduced carbonation performance compared with CEM I. Using a CC with higher meta-kaolinite content enhanced the concrete's carbonation resistance, when evaluated for 650 days of natural exposure. This suggests that generalising the impact of CC addition on concrete performance can be misleading, as bespoke concrete, compliant with specific exposure class requirements, can be produced by appropriate clay selection.

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煅烧粘土源的变高岭石含量影响掺合波特兰混凝土的力学性能和耐久性

本研究评估了CEM I和CEM I加石灰石混合混凝土的力学和耐久性性能，这些混凝土是由煅烧粘土（CC）制成的，其中变高岭石含量不同（70%、50%或20% wt%）。结果表明，含20 wt%偏高岭石的CC可制得45 MPa混凝土。与二元混合料相比，添加石灰石并没有显著改变混凝土的运输或耐久性，尽管熟料因素降低了。含CC混凝土表现出优异的抗氯性，但与CEM相比，碳化性能降低。使用高偏高岭石含量的CC增强了混凝土的抗碳化性能，当评估650天的自然暴露时。这表明，推广CC添加对混凝土性能的影响可能会产生误导，因为符合特定暴露等级要求的定制混凝土可以通过适当的粘土选择来生产。

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来源期刊

Cement and Concrete Research 工程技术-材料科学：综合

CiteScore

20.90

自引率

12.30%

发文量

318

审稿时长

53 days

期刊介绍： Cement and Concrete Research is dedicated to publishing top-notch research on the materials science and engineering of cement, cement composites, mortars, concrete, and related materials incorporating cement or other mineral binders. The journal prioritizes reporting significant findings in research on the properties and performance of cementitious materials. It also covers novel experimental techniques, the latest analytical and modeling methods, examination and diagnosis of actual cement and concrete structures, and the exploration of potential improvements in materials.