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CARBONATION BEHAVIOR OF PASTES CONTAINING BLAST FURNACE SLAG POWDER

： With the aim of elucidating the mechanism of carbonation of cement containing a large amount of ground granulated blast furnace slag, changes in the pore structure and hydrates due to an accelerated carbonation were investigated. With a special focus on C-S-H, changes of its composition in the inner products （IP） and outer products （OP） were evaluated by SEM-EDS. As the results, carbonation reduces the porosity but increases the large-diameter pores （coarsens the pores）. Mixtures with a high carbonation rate lead to more significant pore coarsening due to carbonation. SEM-EDS measurements revealed that the IP C-S-H releases Ca due to carbonation to drastically reduce the Ca/Si, decomposing to an aluminosilicate gel（Ca/Si＜2/3）. In the OP region, Ca（OH） 2 and C-S-H decomposes into CaCO 3 . Furthermore, Ca released from the IP transfers to the OP region to form CaCO 3 . Al/Si of C-S-H did not change by carbonation, which means that Al and Si are held in C-S-H throughout carbonation. Decalcification decrease Ca/Si, and C-S-H decompose to form aluminosilicate gel. By NMR study, it was clarified that Si tetrahedron was polymerized by carbonation, and Al in C-S-H was incorporated into aluminosilicate gel together with Si.