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Impact of Multi-Scale Moisture Transport on Durability of Hardened Cement Pastes

We report on proton NMR relaxation of hardened Grey CEM I paste with two controlled degree of relative humidity. The comparison between these two aged materials evidences that the moisture transport only occurs on the meso and capillary scales. The proton population distribution vs T1 follows power laws with a negative exponent in the nanopore-mesopore pore scale, and a positive exponent in the mesopore-capillary pore scale. This opposite exponent sign shows that the spatial hierarchical proton distribution behaves like a surface and volume distribution on short and large scales, respectively. Improving sustainability and performance of cements is a key point to limit CO2 emission. Long term durability is closely related to unsaturated moisture transport on different length scales of these materials. In our study, hardened cement pastes exhibit threefold hierarchy: intra-CSH (hydraulic binder) nanopore, mesopore structure at a scale ranging from 3 nm to 20 nm and capillary (macro) pore network above 100 nm. The moisture transport at different water filling controlled by temperature and relative humidity ratio is followed by a proton NMR multi-scale approach using PFG diffusometry, field cycling relaxometry and spectroscopy correlated with T1, T2 and T1ρ measurements. In parallel, a similar study is conducted in three types of reference pore network, having nano, meso and macro pore networks MCM41, Vycor, and Controlled Pore Glass CPG, respectively. Here, we report, a proton NMR relaxation study of a hardened Grey CEM I paste (Portland cement) with different controlled relative humidities. This study leads to two main results. First, the comparison between these different aged situations evidences that the moisture transport only occurs at the meso and capillary scales. Second, in the nanopore-mesopore range, the proton population distribution vs T1 follows a power law with a negative exponent. On the contrary,