Effect of surface encapsulating of polylactic acid on the expansion of calcium oxide
LI Lei
ZHANG Shouzhi
LI Hua
LU Anqun
TIAN Qian
WANG Rui
Abstract：CaO expansive agent was modified by surface encapsulating of polylactic acid (PLA). The expansion properties of cement paste,mortar and concrete with 0.5%,1.0% and 2.0% PLA encapsulated ratio in CaO-PLA were investigated by con-strained deformation tests and improved dual rings restraint tests. The results show that the expansion property with PLA modified improved more significantly than unmodified CaO,and the amplification enlarged with the increase of encapsulation rate. Compared with the pastes,mortars or concretes with unmodified CaO expansive agent,the expansion rates of pastes and mortar were increase by 27.4% and 17.6% respectively at the age of 28 days of the 2.0% encapsulating ratio CaO-PLA and the expansion rates of concretes under seal and water curing were increase by 51.1% and 32.4%. The dual rings restraint tests show that the expansion stress of mortar with PLA-CaO of 2.0% encapsulating ratio increased by 45% within 40 hours comparing with the stress with un-modified CaO expansive agent.
Keywords：CaO expansive agentsurface encapsulatingpolylactic acidexpansion property
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 33-36,48 )