Polyvinyl alcohol fiber reinforced cement-based material composition and preparation method and application thereof
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A technology of polyvinyl alcohol fiber and reinforced cement, applied in the field of building materials, can solve problems such as endangering building safety, affecting structural stress state, accelerating freeze-thaw damage, etc., and achieves high crack resistance, low cost and high durability. Effect
Inactive Publication Date: 2010-06-09
沂源县建设工程质量监督站
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For load-bearing concrete structures, cracks may affect the bearing capacity of the structure, the safety and service life of the building; for water-retaining buildings, cracks may cause leakage and affect the stress state of the structure. Rust and soluble erosion, accelerated freeze-thaw damage, and even endanger the safety of buildings, a series of hazards have always caused huge economic losses
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Embodiment 1-4、 comparative example 1、2
[0029] Embodiment 1-4, comparative example 1, 2: raw material proportioning
[0030] According to the proportioning ingredients in Table 1:
[0031] Unit: parts by weight
[0032]
[0033]
Embodiment 5
[0034] Embodiment 5: prepare cement prism
[0035] According to the ratio in Table 1, adopt the following steps to make 6 cement prisms with a size of 40×40×160mm:
[0036] 1) Mix sand, cement, fly ash, silica fume and finely ground quartz powder, add water and stir evenly;
[0037] 2) Add high-efficiency water reducer and mix evenly; (the comparative example does not carry out step 3)
[0038] 3) Add polyvinyl alcohol fiber and stir evenly;
[0039] 4) Pouring into a prism;
[0040] 5) Vibrate and compact;
[0041] 6) Maintain for 24 hours.
Embodiment 6
[0042] Embodiment 6: the experiment to embodiment 5 prism shrinkage and anti-crack performance
[0043] According to relevant national standards, 6 prisms obtained in embodiment 5 are subjected to following experiments: four-point bending experiment, restricted contraction experiment, compressive strength experiment (embodiment 3,4, comparative example 2), the results are as follows:
[0044] Table 2: Results of four-point bending test and restrictive shrinkage test
[0045] Example
total crack area
A(mm 2 )
number of cracks
N (articles)
crack width
(mm)
Average crack width C
(mm)
Crack Control Rate
K(%)
Example 1
4.09
4
0.11
0.068
91.5
Example 2
1.77
6
0.04
0.021
96.3
Comparative example 1
48.00
1
3.20
3.20
----
2.21
4
0.06
0.038
95.0
1.46
5
0.04
0.020
96.7
...
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Abstract
The invention relates to a polyvinyl alcohol fiber reinforced cement-based material composition, and a preparation method and application thereof, belonging to the technical field of building materials, wherein the polyvinyl alcohol fiber reinforced cement-based material composition is prepared by mixing polyvinyl alcohol fibers with a cement-based material. The polyvinyl alcohol fiber reinforced cement-based material composition is characterized in that: (1) the cement-based material is prepared from the following raw materials in parts by weight: 1000 parts of sand, 260 to 400 parts of cement, 300 to 350 parts of pulverized fuel ash, 25 to 30 parts of silicon ash, 0 to 120 parts of levigated quartz powder, 5 to 10 parts of high-efficiency water reducing agents and 300 to 350 parts of water; (2) the mixing quantity of the polyvinyl alcohol fibers is 0.75% to 1.5% of the total weight of a gelled material. The polyvinyl alcohol fiber reinforced cement-based material composition has the advantages of high crack resistance, high durability, easy acquirement of the raw materials, simple fabrication and low cost, can be extensively applied to the building materials, in particular to cement-based boards, building tiles, cement posts and the like.
Description
technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a polyvinyl alcohol fiber reinforced cement-based material and a preparation method thereof. Background technique [0002] Traditional cement-based materials are brittle and prone to cracks. The appearance and expansion of cracks is the initial stage of structural damage, which causes the reduction of material durability, the shedding of component protective layers, corrosion of steel bars, carbonation of concrete, etc. For load-bearing concrete structures, cracks may affect the bearing capacity of the structure, the safety and service life of the building; for water-retaining buildings, cracks may cause leakage and affect the stress state of the structure. Rust and soluble erosion, accelerated freeze-thaw damage, and even endanger the safety of buildings, together a series of hazards have always caused huge economic losses. [0003] Compositing is an imp...
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