CN102936118A

CN102936118A - High elongation brick column

Info

Publication number: CN102936118A
Application number: CN2012104350202A
Authority: CN
Inventors: 梁兴文; 邓明科; 代洁
Original assignee: Xian University of Architecture and Technology
Current assignee: Xi'an Wuhe New Material Technology Group Co.,Ltd.
Priority date: 2012-11-04
Filing date: 2012-11-04
Publication date: 2013-02-20
Anticipated expiration: 2032-11-04
Also published as: CN102936118B

Abstract

The invention discloses a high elongation brick column which solves the problems of fragility, low bearing capacity and poor anti-seismic property in the existing brick columns. Masonry mortar of the high elongation brick column is high elongation mortar, and the high elongation mortar comprises cement, coal ash, silica fume, sand, polyvinyl alcohol (PVA) fiber and water. The anti-seismic property of the high elongation brick column is remarkably better than that of a common brick column. The high elongation brick column is high in strength and good in ductility. Simultaneously the high elongation mortar can restrain damage on bricks, brittle failure of the brick columns is prevented, and energy consumption capacity of a brick masonry structure can be greatly improved.

Description

A kind of high ductility brick post

Technical field

The invention belongs to technical field of civil engineering, be specially a kind of high ductility brick post.

Background technology

At present, brick masonry structure is widely used in industry and the covil construction field of China, but because the brittleness of brick structures material, and its tension, shearing resistance and bending strength are all lower and deadweight is larger, and the utmost point is unfavorable for structural seismic.

The brick post is one of most important supporting member in the brick masonry structure, bears the vertical load that superstructure and beam transmit, and also bears simultaneously part or all of horizontal loading, and its anti-seismic performance has considerable influence to the security of masonry structure.Set up defences and require to improve, use the reasons such as changing function and structure erosion be impaired owing to Antiseismic building, all may cause the bearing capacity of brick post not meet the demands.To sum up, existing common brick post have that fragility, intensity are low, the shortcoming of ductility and poor seismic behavior.

Summary of the invention

The high ductility brick post that provides a kind of difficult generation brittle rupture and ductility and anti-seismic performance good is provided one of purpose of the present invention.

For this reason, high ductility brick post provided by the invention comprises the brick post, the masonry mortar of this brick post is high ductility mortar, the component of this high ductility mortar is cement, flyash, silicon ash, sand, PVA fiber and water, wherein, by mass percentage, cement: flyash: silicon ash: sand: water=1:0.9:0.1:0.76:0.58; Cumulative volume after mixing take cement, flyash, silicon ash, Sha Heshui is as radix, and the volume volume of PVA fiber is 1.5%.

Preferably, above-mentioned cement is the P.O.52.5R silicate cement; Flyash is I level flyash; The loss on ignition of silicon ash less than 6%, dioxide-containing silica greater than 85%, specific surface area is greater than 15000m ²/ kg; The maximum particle diameter of sand is 1.26mm; The length of PVA fiber is that 6 ~ 12mm, diameter are that 26 μ m are above, tensile strength is that 1200MPa is above, Young's modulus is more than the 30GPa.

Preferably, be added with water-reducing rate in the above-mentioned high ductility mortar and be the polycarboxylate water-reducer more than 30%, and the addition of water reducer is 0.8% of flyash, silicon ash and cement total mass.

Preferably, the preparation method of above-mentioned high ductility mortar is: the water that adds water reducer and 80% after cement, silicon ash, flyash and the sand dry mixing is evenly stirred; Adding afterwards the stir water of rear adding residue 20% of PVA fiber stirs and namely gets high ductility mortar again.

The employed masonry mortar of the high ductility brick of the present invention post is that this mortar has the characteristics of high strength and high tenacity take high ductility mortar as starting material, can improve intensity and the deformability of mortar, and then improves bearing capacity, ductility and the anti-seismic performance of brick post.

Compare with existing brick post, high ductility brick post of the present invention has following characteristics:

(1) the high ductility mortar ultimate compression strength of the present invention's employing can reach more than the 60MPa, ultimate tensile strength can reach more than 100 times of ordinary mortar, plastic deformation ability with similar steel, and good adhesive property is arranged between the brick structures, it is a kind of ecological architectural material with high strength, high ductility, high-durability and high damnification resistant ability, but the intensity of Effective Raise mortar and deformation performance further improve bearing capacity, ductility and the anti-seismic performance of brick post.

(2) distortion and the energy dissipation capacity of high ductility brick post of the present invention are significantly increased, and have strengthened simultaneously the bonding of blockhouse, can increase substantially the anti-seismic performance of brick masonry structure, and manufacture craft are simple.

Description of drawings

The present invention is described in further detail below in conjunction with the drawings and specific embodiments.

Fig. 1 is the structural representation of the embodiment of the invention 1 high ductility brick post;

The high ductility mortar of each coded representation: 1-, 2-solid brick among the figure.

Embodiment

Embodiment 1:

As shown in Figure 1, in the present embodiment, the sectional dimension of the brick post in this example is 370mm * 370mm, the high 3.9m of post, and solid brick is adopted in building block, is of a size of 240mm * 115mm * 53mm.This brick post adopts high ductility mortar to build by laying bricks or stones, and mortar thickness is 7mm.

Follow technical scheme of the present invention, the component of the high ductility mortar of this embodiment is cement, flyash, silicon ash, sand, PVA fiber and water, wherein, by mass percentage, cement: flyash: silicon ash: sand: water=1:0.9:0.1:0.76:0.58; Cumulative volume after mixing take cement, flyash, silicon ash, Sha Heshui is as radix, and the volume volume of PVA fiber (polyvinyl alcohol fiber) is 1.5%; Used cement is the P.O.52.5R silicate cement, and flyash is I level flyash, and the loss on ignition of silicon ash is 5%, dioxide-containing silica is 88%, specific surface area is 18000m ²/ kg, the maximum particle diameter of sand is 1.26mm; The PVA fiber is the PA600 fiber that Shanghai Luo Yang Science and Technology Ltd. produces, length is that 8mm, diameter are that 26 μ m, tensile strength are that 1200MPa, Young's modulus are 30GPa, is added with Jiangsu Botexin Materials Co., Ltd in the high ductility mortar of this embodiment

-I high performance water reducing agent of polyocarboxy acid, the addition of water reducer are 0.8% of flyash, cement and silicon ash gross weight.

The preparation method of the high ductility mortar of this embodiment is: at first cement, silicon ash, flyash and sand were poured in the forced mixer into dry mixing 2 ~ 3 minutes; The water that adds again water reducer and 80% stirred 1 ~ 2 minute; Then add PVA fiber restir and add residue 20% water after 2 minutes, stirred 1 ~ 2 minute.

Below be mechanical property test and the result thereof about the high ductility mortar of the present embodiment that the contriver provides.

(1) adopts the standard die trial of 70.7mm * 70.7mm * 70.7mm to make test cube, by normal curing method maintenance 60 days, carry out the cubic compressive strength test.Test-results shows: high ductility mortar specimen ultimate compression strength mean value is 65MPa, and unloading was carried out loading again the second time after test block reached peak load, and Residual Compressive Strength can reach 80% of peak load, and the test block destructive process has obvious resistance to compression toughness.

(2) adopt the standard die trial of 40mm * 40mm * 160mm to make prism bending resistance test specimen, by normal curing method maintenance 60 days, carry out experiment on flexural behavior.Test-results shows: the first crack strength of high ductility mortar specimen is 4.8MPa, bearing capacity continues to improve after the test specimen cracking, ultimate strength is 10.1MPa, reach peak load after depression of bearing force slow, calculate its bend ductility of bend ductility coefficient I of gained according to ASTM C1018 method ₅, I ₁₀, I ₂₀, I ₃₀Be respectively 6.2,14.5,33.0,50.6, show to have very high bend ductility.

(3) adopt the die trial of 50mm * 15mm * 350mm to make the stretching test block, by normal curing method maintenance 60 days, carry out direct tensile test.The result shows: high ductility mortar specimen uniaxial tension test mean value is 3.6MPa, and ultimate tensile strength can reach 1.2%, and bearing capacity remains unchanged substantially after the test specimen cracking, has good tensile toughness, occurs more than 10 cracks in the destructive process.

Above test shows, the ultimate tensile strength of high ductility mortar is far above the ultimate tensile strength of ordinary mortar among " Code for design of masonry strucres " GB50003, high ductility mortar pressurized, tension, all have higher toughness when being subjected to curved destruction, its destructive characteristics has obviously different from ordinary mortar generation brittle rupture.

The above-mentioned mechanical characteristic of the high ductility mortar of this embodiment shows, the mortar strength that adopts high ductility mortar to make is high, deformability good, is difficult for occuring brittle rupture.Build the brick post by laying bricks or stones with it, can significantly improve bearing capacity, ductility and the anti-seismic performance of brick post.

High ductility brick post of the present invention can be used for classroom building of elementary and middle schools brick post, single-storey factory building heavy-load bearing brick post, classroom building of elementary and middle schools forming column etc.

Claims

1. one kind high ductility brick post, comprise the brick post, it is characterized in that, the masonry mortar of this brick post is high ductility mortar, the component of described high ductility mortar is cement, flyash, silicon ash, sand, PVA fiber and water, wherein, by mass percentage, cement: flyash: silicon ash: sand: water=1:0.9:0.1:0.76:0.58; Cumulative volume after mixing take cement, flyash, silicon ash, Sha Heshui is as radix, and the volume volume of PVA fiber is 1.5%.

2. high ductility brick post as claimed in claim 1 is characterized in that, described cement is the P.O.52.5R silicate cement; Described flyash is I level flyash; The loss on ignition of described silicon ash less than 6%, dioxide-containing silica greater than 85%, specific surface area is greater than 15000m ²/ kg; The maximum particle diameter of described sand is 1.26mm; The length of described PVA fiber is that 6～12mm, diameter are that 26 μ m are above, tensile strength is that 1200MPa is above, Young's modulus is more than the 30GPa.

3. high ductility brick post as claimed in claim 1 is characterized in that, is added with water-reducing rate at the polycarboxylate water-reducer more than 30% in the described high ductility mortar, and the addition of water reducer is 0.8% of flyash, silicon ash and cement gross weight.

4. high ductility brick post as claimed in claim 3 is characterized in that, the preparation method of described high ductility mortar is: the water that adds water reducer and 80% after cement, silicon ash, flyash and the sand dry mixing is evenly stirred; Adding afterwards the stir water of rear adding residue 20% of PVA fiber stirs and namely gets high ductility mortar again.