When necessary to retain workability, a superplasticizer based on polycarboxylate ether with a solid content of 40 mass-% was used. The water content of the superplasticizer was accounted for in the mixing water. The starting point for the mix design of the concretes with C-LWA was the reference concrete. The amount of the C-LWA in the mixes was calculated in a way to introduce sufficient negative emissions to compensate for the emissions of the respective concrete mix design (see the next section). The C-LWA replaced a part of the normal-weight coarse aggregate and were added in two ways: i) after presaturation with water for 24 h and ii) without presaturation, in their cured state. These are referred to as C-LWA saturated and C-LWA dry, respectively. In the latter case, the term "dry" refers to the method in which they are added and does not indicate that they are absolutely dry. These two methods represent the two extreme strategies of mixing the LWA and accounting for their water absorption in the mix composition . For the C-LWA saturated, the amount of water absorbed by the C-LWA was used in addition to the mixing water, hence increasing the total water content of the concrete, but not the effective w/c compared to the reference concrete (a slightly higher w/c of 0.53 compared to 0.52 is due to less normal-weight aggregate in the concrete). In this case, the mix design, except for replacing a part of the normal-weight aggregates with the C-LWA remained as in the reference mix.