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Evaluation of Portland limestone cements for use in concrete construction

机译:用于混凝土建筑的硅酸盐石灰石水泥的评估

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The paper describes a study carried out to examine the performance of concrete produced using combinations of Portland cement (PC) and limestone (LS), covering compositions for Portland limestone cement (PLC) conforming to BS EN 197-1: 2000, and up to 45% LS. In particular, key engineering (mechanical) and durability properties of concrete were studied. The results indicate only minor differences in performance between PC and 15% PLC concretes of the same cement content and water/cement (w/c) ratio (cement = Portland cement + addition). However, there was an adverse effect with increasing LS content beyond 15% of the cement content for many properties. It is shown that for 35 N/mm~2 cube strength concrete the adjustment to w/c ratio to match the compressive strength of PC concrete was in the region of 0.08 for each 10% LS added (water curing at 20℃) above this level. Studies of permeation and concrete durability performance, including, initial surface absorption, carbonation resistance, chloride diffusion, freeze/thaw scaling and abrasion resistance, indicate that in general the test concretes followed single relationships with strength for most properties. Consideration is given to the practical implications of the main outcomes of the study.%pour le PC et les mélanges de béton de PLC On s'intéresse aux implications pratiques des principaux résultats de l'étude.
机译:本文描述了一项研究,目的是检查使用波特兰水泥(PC)和石灰石(LS)组合生产的混凝土的性能,涵盖符合BS EN 197-1:2000的硅酸盐石灰石水泥(PLC)组成,直至45%LS。特别是,研究了混凝土的关键工程(机械)和耐久性能。结果表明,相同水泥含量和水/水泥(w / c)比(水泥=波特兰水泥+掺量)的PC和15%PLC混凝土之间的性能差异很小。然而,对于许多性能而言,LS含量超过水泥含量的15%会产生不利影响。结果表明,对于35 N / mm〜2的立方强度混凝土,在此之上每添加10%LS(20℃水固化),与PC混凝土的抗压强度相对应的w / c比调整在0.08左右。水平。对渗透性和混凝土耐久性能的研究,包括初始表面吸收,抗碳化性,氯化物扩散,抗冻融性和耐磨性,表明在大多数情况下,测试混凝土与强度具有单一关系。考虑了该研究的主要成果的实际意义。%pour le PC et lesmélangesdebétonde PLC关于s'intéresseaux含义principaux des principauxrésultatsde l'étude。

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