Man-made mineral fibre for three-dimensional reinforcement of a cement product
A technology for synthetic fibers and cement products, which is applied in the direction of fiber treatment, fiber chemical characteristics, and conjugated synthetic polymer artificial filaments. It can solve the problems of cement products not showing high durability, poor fiber dispersion, and non-uniform surface tension. question
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Embodiment 1
[0084] The preparation of embodiment 1 long cutting synthetic fiber
[0085] The fibers were prepared by melting polypropylene 21020-02 (grade 1, Russian Federation State Standard 26996-86) in two separate extruders. Ethylene-vinyl acetate was added to the polypropylene melt in an extruder in an amount of 20% by weight of the melt. Polyvinyl alcohol as an adhesive binder was added to another melt used to form the core by a metering feeder in an amount of 7% by weight of the melt.
[0086] The melt from the extruder is fed further via a line onto a spinneret plate, where fibers with a concentric core-coating structure are formed. The resulting fibers are then cooled with an air stream. Subsequently, the fibers were treated with corona discharge and drawn at a draw ratio of 1.2. After the fibers were drawn at a draw ratio of 3.5, treated with a Sintesin 7465 solution and heat set, the resulting fiber tows were packaged into "cans" (packages for transport to the draw line). N...
Embodiment 2
[0087] The preparation of embodiment 2 short-cut synthetic fibers
[0088]Short-cut synthetic fibers were obtained by a method similar to that described in Example 1, except that the fibers were cut in 5 mm lengths. Thus, the fiber diameter is 25 μm, surface tension - 48 mN / m, elongation at break - 27%.
Embodiment 3
[0089] Example 3 Precast concrete elements for residential and industrial buildings
[0090] In the construction part, the most widely used is the density of 2200 ~ 2500kg / m 3 Conventional heavy concrete, including heavy ore fillers (sand, gravel, crushed stone) and by-products of local industry (such as crushed slag and granular metallurgical slag). In order to promote the curing of concrete, heat treatment is carried out when preparing precast concrete elements.
[0091] Test samples and reference samples of conventional heavy concrete mixtures of the following compositions were prepared.
[0092] Water: 140l
[0093] Cement: 350kg
[0094] Gravel: 1415kg
[0095] Sand: 590kg.
[0096] The fiber tow of Example 1 was added to the test mixture sample in an amount of 0.875 kg per 350 kg of cement material (ie 0.0025 kg per 1 kg of cement).
[0097] Fiber tows disclosed in patent RU 2074153 with a length of 12 mm and a diameter of 20 μm were added to the sample of the refe...
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Abstract
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