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US 12,509,395 B2Granted
Methods and compositions for production of green mortar
AssigneeCity University of Hong Kong
InventorsDenvid Lau, Huali Hao
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Abstract
A method of pre-treating plastic using plasms is disclosed. The plasma is applied to plastic in an atmosphere such as oxygen that encourages formation of functional groups on an otherwise inert plastic surface. The functional groups such as hydrogen group, carboxyl group, and formyl group are introduced on the surface of the recycled plastics. This allows the use of plastic to replace part of the sand aggregate in mortar, resulting in a more environmentally friendly mortar.
Claims2
A method of preparing a mortar with enhanced compressive strength consisting of
- (a) mixing hydrated cement, an aggregate of sand and plasma-treated polyethylene terephthalate (PET), and water at a ratio of 1:2.75:0.485 to form a first mixture;
- (b) casting the first mixture in a mold to form a mortar;
- (c) immersing the mortar of step (b) in water for 24 hours;
- (d) drying the mortar of step (c) for 24 hours;
- and
- (e) curing the mortar of step (d) at 20 degrees Celsius for 28 days thereby producing the mortar with enhanced compressive strength, wherein,
- the mortar with enhanced compressive strength has 10 wt. % of the plasma-treated PET, and a compressive strength of about 16.3 MPa to about 21.1 MPa.
4 more elements
Dependencies are inferred from the claim text.