Report of RILEM TC 281-CCC: outcomes of a round robin on the resistance to accelerated carbonation of Portland, Portland-fly ash and blast-furnace blended cements.
Report of RILEM TC 281-CCC: outcomes of a round robin on the resistance to accelerated carbonation of Portland, Portland-fly ash and blast-furnace blended cements.
复制标题
DOI：
10.1617/s11527-022-01927-7
复制
发表时间：
2022
影响因子：
3.8
通讯作者：
Gruyaert E
中科院分区：
文献类型：
--
作者：
Vanoutrive H;Van den Heede P;Alderete N;Andrade C;Bansal T;Camões A;Cizer Ö;De Belie N;Ducman V;Etxeberria M;Frederickx L;Grengg C;Ignjatović I;Ling TC;Liu Z;Garcia-Lodeiro I;Lothenbach B;Medina Martinez C;Sanchez-Montero J;Olonade K;Palomo A;Phung QT;Rebolledo N;Sakoparnig M;Sideris K;Thiel C;Visalakshi T;Vollpracht A;von Greve-Dierfeld S;Wei J;Wu B;Zając M;Zhao Z;Gruyaert E
存在许多（国际）国家标准来评估砂浆和混凝土的抗碳化性。当碳化系数用于混合物的性能比较或使用寿命预测时，在固化、预处理和碳化过程中应用的边界条件起着至关重要的作用，特别是当使用潜在的水硬性或火山灰辅助胶凝材料（SCM）时。在RILEM TC 281-CCC“SCM混凝土碳化”的框架内，建立了一个由22个实验室参与的广泛的实验室间试验（ILT）。对三种水泥（CEM I、CEM II/B-V、CEM III/B）在砂浆和混凝土尺度上的碳化深度和碳化系数进行了统计学比较。本研究的结果表明，与56天或更短的暴露持续时间相比，91天暴露后基于碳酸化深度的碳酸化速率最接近线性回归的斜率，因此，91天的碳酸化深度可以被视为对潜在抗碳酸化性的良好估计。本研究中评价的所有标准均将三种水泥类型按抗碳酸化性的相同顺序排列。不幸的是，实验室内和实验室之间的大的变化复杂化，以得出明确的结论，样品预处理和碳酸化暴露条件的影响，对试样的碳酸化性能进行测试。然而，它被确定为新鲜和硬化状态的属性不能单独用于推断抗碳化的砂浆或混凝土测试。人们还发现，密封固化的结果在更大的碳酸化深度相比，水固化。然而，当水固化从28天减少到3天或7天时，观察到与密封固化相比更高的碳酸化深度。与CEM III混合物相比，CEM I的这种增加更明显。实验室之间的差异大于将CO2浓度从1%提高到4%的潜在影响。最后，混凝土，其中的骨料水泥系数增加了1.79，与砂浆相比，有一个碳化系数砂浆的1.18倍。在线版本包含补充材料，可通过10.1617/s11527-022-01927-7获得。
Many (inter)national standards exist to evaluate the resistance of mortar and concrete to carbonation. When a carbonation coefficient is used for performance comparison of mixtures or service life prediction, the applied boundary conditions during curing, preconditioning and carbonation play a crucial role, specifically when using latent hydraulic or pozzolanic supplementary cementitious materials (SCMs). An extensive interlaboratory test (ILT) with twenty two participating laboratories was set up in the framework of RILEM TC 281-CCC ‘Carbonation of Concrete with SCMs’. The carbonation depths and coefficients determined by following several (inter)national standards for three cement types (CEM I, CEM II/B-V, CEM III/B) both on mortar and concrete scale were statistically compared. The outcomes of this study showed that the carbonation rate based on the carbonation depths after 91 days exposure, compared to 56 days or less exposure duration, best approximates the slope of the linear regression and those 91 days carbonation depths can therefore be considered as a good estimate of the potential resistance to carbonation. All standards evaluated in this study ranked the three cement types in the same order of carbonation resistance. Unfortunately, large variations within and between laboratories complicate to draw clear conclusions regarding the effect of sample pre-conditioning and carbonation exposure conditions on the carbonation performance of the specimens tested. Nevertheless, it was identified that fresh and hardened state properties alone cannot be used to infer carbonation resistance of the mortars or concretes tested. It was also found that sealed curing results in larger carbonation depths compared to water curing. However, when water curing was reduced from 28 to 3 or 7 days, higher carbonation depths compared to sealed curing were observed. This increase is more pronounced for CEM I compared to CEM III mixes. The variation between laboratories is larger than the potential effect of raising the CO2 concentration from 1 to 4%. Finally, concrete, for which the aggregate-to-cement factor was increased by 1.79 in comparison with mortar, had a carbonation coefficient 1.18 times the one of mortar. The online version contains supplementary material available at 10.1617/s11527-022-01927-7.
登录
查看更多内容
影响因子：
11.4
作者：
Lothenbach, Barbara;Scrivener, Karen;Hooton, R. D.
通讯作者：
Hooton, R. D.
影响因子：
4.5
作者：
Cizer, Ozlem;Rodriguez-Navarro, Carlos;Van Balen, Koenraad
通讯作者：
Van Balen, Koenraad
影响因子：
11.4
作者：
Bernal, Susan A.;Provis, John L.;van Deventer, Jannie S. J.
通讯作者：
van Deventer, Jannie S. J.
影响因子：
3.8
作者：
Castellote, Marta;Fernandez, Lorenzo;Alonso, Cruz
通讯作者：
Alonso, Cruz
影响因子：
11.4
作者：
Galan, Isabel;Andrade, Carmen;Castellote, Marta
通讯作者：
Castellote, Marta