セメントモルタル・エポキシレジンモルタル打ち継ぎ接合部およびエポキシ樹脂接着剤によるセメントモルタル・Kセメントモルタル打ち継ぎ接合部の耐久性

抄録

The accelerated weatherability (40°C, 2000hrs), heat resistance (100°C, 2000hrs), and water resistance (20°C, 2000hrs) of jointings of successive pours of cement mortar-epoxy-resin mortars (8 kinds), and jointings of successive pours of cement mortar-K cement mortar with epoxy resin adhesives (11 kinds) were investigated. The curing condition of test specimens was 4°C for 28 days. Their strength retentions (tensile bond, bending bond, compressive: mortar) and variation of failure states were examined.
The results obtained are summarized as follows:
(1) All of the original test specimens showed good performance for practical use.
(2) All types of test specimens showed a correlation between the strength after exposure to weather meter and the strength after water soaking.
(3) The retention of bond strength of jointings of successive pours of cement mortar-epoxy resin mortars after the weather meter test and the water soaking test was satisfactory for the combinations of DGEBA or modified DGEBA and modified ALP, but not so for the combination of DGESPA and modified XDA.
(4) The retention of bond strength of jointings of successive pours of cement mortar-K cement mortar by epoxy resin adhesives after the weather meter test and the water soaking test was good for the combinations of DGEBA or modified DGEBA and modified ALP, blend of ALP or blend of modified ARP, but not good for the combination of DGESPA and modified XDA.
(5) As the result of decrease in strength of cement mortar and K cement mortar near the interface by the Geer oven test, the bond strength retention was found to be lowered for all jointings (with one exception).
(6) Only the epoxy resin mortar which comprised of the combination of DGESPA and modified XDA as the binder showed a remarkable decrease in compressive strength by the Geer oven test.