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. 2020 Jul 7;13(13):3041. doi: 10.3390/ma13133041

Figure 1.

Figure 1

SEM images at 91 days for two different OPC-CSA mortar mixtures: (a) interfacial transition zones (ITZ) surrounding sand for OPC-CSA mixture made without light-weight sand (LWS) and (b) ITZ surrounding LWS for OPC-CSA mixture containing 20% LWS replacement [19], with copyright permission from Elsevier.