| abstract |
The acrylic latex modified quick-setting concrete composition of the present invention is a modified concrete for preventing retardation of hydration reaction of cement caused by latex coating and generation of etrinite, which is an initial reactive material, 15 to 20% by weight of a quick-setting cement composition which is stable in strength development over a long period of time when mixed with an aggregate; 35 to 40% by weight of fine aggregate passing through a 2.5 mm sieve and remaining in a 0.08 mm sieve; 30 to 35% by weight of coarse aggregate which passed through a 13 mm sieve and remained in a 2.5 mm sieve; 4 to 7% by weight of an acrylic latex as a modifier; 0.04 to 0.07% by weight of citric acid monohydrate having a purity of 99% or more which is a retarding agent to be added for controlling the working time; And 3.5 to 5% by weight of water. The method for preparing an acrylic latex modified quick-speed lightweight concrete composition comprises: a first step of preparing a quick-setting cement composition; A second step of stirring 15 to 20 wt% of a quick-setting cement composition, 35 to 40 wt% of a fine aggregate, and 30 to 35 wt% of a coarse aggregate, in a forced mixer; 3.5 to 5.0% by weight of water, 4 to 7% by weight of acrylic latex and 0.04 to 0.07% by weight of a retarder were further mixed and stirred in a forced mixer in which the cement composition for ultra fast speed, fine aggregate and coarse aggregate were uniformly mixed to prepare a modified quick- And a third step of completing the process. The acrylic latex modified quick-setting concrete composition of the present invention and its preparation method overcome the difficulty of securing low-temperature exothermic properties and quick-speed properties by promoting the initial hydration reaction rate and hydration heat, thereby exhibiting excellent structural characteristics such as compressive strength and adhesion strength It is possible to open within 4 hours after opening and repairing the road. It has excellent durability such as salt penetration resistance and freezing and thawing resistance, which makes it suitable as road pavement and repair material. In addition to this, have. |