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Plastic shrinkage of concrete made with calcined clay-limestone cement
Cement and Concrete Research ( IF 10.9 ) Pub Date : 2025-01-09 , DOI: 10.1016/j.cemconres.2025.107784
Mateusz Wyrzykowski, Carmelo Di Bella, Davide Sirtoli, Nikolajs Toropovs, Pietro Lura

Concrete made with blended cements with high clinker replacement ratios may be at higher risk of plastic shrinkage cracking when experiencing high evaporation rates immediately after casting. This paper investigates the plastic shrinkage behavior of concretes made with a cement with clinker replacement by a blend of calcined clay and limestone, which was compared to a conventional Portland cement and a Portland-limestone cement. In order to assess the risk of cracking, we studied early deformations and accompanying processes in concretes exposed to fast evaporation in a wind tunnel. As could be expected from previous studies, concretes made with both blended cements experienced higher shrinkage and cracking compared to ordinary Portland cement, mainly due to their slower hydration caused by a lower clinker amount and higher dosage of superplasticizer. However, the extent of plastic shrinkage cracking was similar with calcined-clay limestone cement and Portland-limestone cement.

中文翻译:


煅烧粘土-石灰石水泥混凝土的塑性收缩



用熟料替代率高的混合水泥制成的混凝土在浇筑后立即经历高蒸发率时,可能面临更高的塑料收缩开裂风险。本文研究了用煅烧粘土和石灰石混合物替代熟料的水泥制成的混凝土的塑性收缩行为,并将其与传统的波特兰水泥和波特兰石灰石水泥进行了比较。为了评估开裂的风险,我们研究了在风洞中暴露于快速蒸发的混凝土的早期变形和伴随过程。从以前的研究中可以预期,与普通波特兰水泥相比,用这两种混合水泥制成的混凝土经历了更高的收缩和开裂,这主要是由于熟料用量较低和高效减水剂剂量较高导致水化速度较慢。然而,煅烧粘土石灰石水泥和波特兰石灰石水泥的塑性收缩开裂程度相似。
更新日期:2025-01-09
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