CN103482893B - Application of loofah fibers in mortar and loofah fiber toughening and anti-cracking mortar - Google Patents
Application of loofah fibers in mortar and loofah fiber toughening and anti-cracking mortar Download PDFInfo
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- CN103482893B CN103482893B CN201310434771.7A CN201310434771A CN103482893B CN 103482893 B CN103482893 B CN 103482893B CN 201310434771 A CN201310434771 A CN 201310434771A CN 103482893 B CN103482893 B CN 103482893B
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Abstract
The invention belongs to the technical field of building materials and particularly relates to application of loofah fibers in mortar. According to the invention, the loofah fibers are added into the mortar, so as to improve the toughness and crack resistance of the mortar, reduce dry shrinkage value, meanwhile, develop the porous and connected pore channel structures of the loofah fibers, which have the effects of water retention and water storage, and have the advantage that necessary moisture is provided for a mortar matrix to prevent dry shrinkage deformation at an early stage.
Description
Technical field
The invention belongs to building material technical field, be specifically related to the application of a kind of luffa fibers in mortar, relate to the toughness reinforcing crack resist at mortar of a kind of luffa fibers simultaneously.
Background technology
Building mortar is generally made up of cement, sand, water, is a kind of hard brittle material, and ultimate compression strength is high, tensile strength is low and ultimate strain is little, therefore mortar poor toughness, easy to crack.At present existing multiple method improves the early anti-cracking behavior energy of mortar, and admixture synthon such as PVA, polypropylene fibre, carbon fiber etc. are comparatively effective meanss.But these synthon are not eco-friendly, and seldom consider its sustainable developability, as the need of production phenolic compound of PVA and polypropylene fibre as antioxidant and amine as uvioresistant stablizer.Finding new early anti-cracking behavior can desirable mortar be the direction that those skilled in the art study always.
Summary of the invention
The invention provides the application of a kind of luffa fibers in mortar, provide a kind of luffa fibers toughness reinforcing crack resist at mortar simultaneously.
The present invention is by the following technical solutions:
The application of luffa fibers in mortar.
300-900g luffa fibers is added in every cubic metre of mortar.
Further preferably, 400-800g luffa fibers is added in every cubic metre of mortar.
The toughness reinforcing crack resist at mortar of a kind of luffa fibers, raw material is: 1m
3raw material needed for mortar and 300-900g luffa fibers (doing).
Further preferably, the amount of luffa fibers is 400-800g.
1m
3mortar raw material used is cement, Sha Heshui, and the consumption of sand is 1m
3.
Cement, sand and quality are than being 1:1.5:0.5 ~ 0.8.
The preparation method of the toughness reinforcing crack resist at mortar of luffa fibers, comprises the following steps and is 1. soaked in water by luffa fibers, makes its moisture adsorbing maximum become saturation water luffa fibers; 2. first in part of cement, add part sand to stir, add saturation water luffa fibers;
in the process adding saturation water luffa fibers, add remaining cement and sand in batches, stir and luffa fibers is uniformly dispersed, add water, continue stirring and luffa fibers is disperseed further.
Luffa fibers adopts following methods to obtain: chalina is first cut into sponge gourd section, sponge gourd section is torn into single sponge gourd silk, and 1 ~ 1.5cm cut short into by sponge gourd silk.
Luffa fibers preferably adopts modification luffa fibers, modification luffa fibers adopts following methods to obtain: chalina is first cut into sponge gourd section, sponge gourd section is torn into single sponge gourd silk, then add in 2-12% mass concentration LiOH solution, at 100 DEG C, boil 2h, then use distilled water repetitive scrubbing, until during scavenging solution last by pH value detection paper, till when its pH value is 7, then by cleaned sponge gourd silk at 60 DEG C dry 6 hours, then cut short into 1 ~ 1.5cm modification luffa fibers.
Compared with prior art, the present invention has actively useful effect:
(1) luffa fibers has the features such as light weight, inexpensive, renewable, wide, the natural degradable of distributing, a kind of environmental protection friendly and renewable resources fiber type, the unrest of luffa fibers in mortar serves the effect of connection to irregular distribution, effectively prevent and inhibit the segregation of mortar;
(2) luffa fibers inside presents cell texture, and is the duct be communicated with, and as water pipe laid out in parallel one by one, can play water conservation water storage effect in mortar, can be mortar matrix and to afford redress necessary moisture dry-shrinkage deformed in early days;
(3) utilize modification luffa fibers to improve toughness and the resistance to cleavage of sand-cement slurry, reduce air shrinkage value, Be very effective, its anti-cracking performance ratio reaches 90 ~ 98.2%.
The present invention adds luffa fibers and is applicable to the mortars for building such as the levelling coat of plaster that the masonry mortar of masonry structure and house wall whitewash in mortar.
Embodiment
Embodiment 1
The toughness reinforcing crack resist at mortar of a kind of luffa fibers, raw material is 1m
3mortar raw materials used (cement 920kg, sand 1380kg, water 460 kg) and 300g luffa fibers.
During preparation, 1. the 300g luffa fibers of 1 ~ 1.5cm is soaked in water, makes its moisture adsorbing maximum become saturation water luffa fibers; 2. first in 500kg cement, add 700kg sand to stir, slowly spill into saturation water luffa fibers, notice that saturation water luffa fibers is not dispersed on stirred vessel inwall;
in the process adding saturation water luffa fibers, add remaining cement and sand in batches, stir 3 minutes, luffa fibers is uniformly dispersed, adds 460kg water, continue stirring 3 minutes, luffa fibers is disperseed further.
Embodiment 2
The toughness reinforcing crack resist at mortar of a kind of luffa fibers, raw material is 1m
3mortar raw materials used (cement 920kg, sand 1380kg, water 730 kg) and 400g luffa fibers.
During preparation, 1. the 400g luffa fibers of 1 ~ 1.5cm is soaked in water, makes its moisture adsorbing maximum become saturation water luffa fibers; 2. first in 500kg cement, add 700kg sand to stir, slowly spill into saturation water luffa fibers, notice that saturation water luffa fibers is not dispersed on stirred vessel inwall;
in the process adding saturation water luffa fibers, add remaining cement and sand in batches, stir 3 minutes, luffa fibers is uniformly dispersed, adds 730kg water, continue stirring 3 minutes, luffa fibers is disperseed further.
Embodiment 3
The toughness reinforcing crack resist at mortar of a kind of luffa fibers, raw material is 1m
3mortar raw materials used (cement 920kg, sand 1380kg, water 600kg) and 500g luffa fibers.
During preparation, 1. the 500g luffa fibers of 1 ~ 1.5cm is soaked in water, makes its moisture adsorbing maximum become saturation water luffa fibers; 2. first in 500kg cement, add 700kg sand to stir, slowly spill into saturation water luffa fibers, notice that saturation water luffa fibers is not dispersed on stirred vessel inwall;
in the process adding saturation water luffa fibers, add remaining cement and sand in batches, stir 3 minutes, luffa fibers is uniformly dispersed, adds 600kg water, continue stirring 3 minutes, luffa fibers is disperseed further.
Embodiment 4
The toughness reinforcing crack resist at mortar of a kind of luffa fibers, raw material is 1m
3mortar raw materials used (cement 920kg, sand 1380kg, water 460 kg) and 600g luffa fibers.
During preparation, 1. the 600g luffa fibers of 1 ~ 1.5cm is soaked in water, makes its moisture adsorbing maximum become saturation water luffa fibers; 2. first in 500kg cement, add 700kg sand to stir, slowly spill into saturation water luffa fibers, notice that saturation water luffa fibers is not dispersed on stirred vessel inwall;
in the process adding saturation water luffa fibers, add remaining cement and sand in batches, stir 3 minutes, luffa fibers is uniformly dispersed, adds 460kg water, continue stirring 3 minutes, luffa fibers is disperseed further.
Embodiment 5
The toughness reinforcing crack resist at mortar of a kind of luffa fibers, raw material is 1m
3mortar raw materials used (cement 920kg, sand 1380kg, water 460 kg) and 700g luffa fibers.
During preparation, 1. the 700g luffa fibers of 1 ~ 1.5cm is soaked in water, makes its moisture adsorbing maximum become saturation water luffa fibers; 2. first in 500kg cement, add 700kg sand to stir, slowly spill into saturation water luffa fibers, notice that saturation water luffa fibers is not dispersed on stirred vessel inwall;
in the process adding saturation water luffa fibers, add remaining cement and sand in batches, stir 3 minutes, luffa fibers is uniformly dispersed, adds 460kg water, continue stirring 3 minutes, luffa fibers is disperseed further.
Embodiment 6
The toughness reinforcing crack resist at mortar of a kind of luffa fibers, raw material is 1m
3mortar raw materials used (cement 920kg, sand 1380kg, water 460 kg) and 800g luffa fibers.
During preparation, 1. the 800g luffa fibers of 1 ~ 1.5cm is soaked in water, makes its moisture adsorbing maximum become saturation water luffa fibers; 2. first in 500kg cement, add 700kg sand to stir, slowly spill into saturation water luffa fibers, notice that saturation water luffa fibers is not dispersed on stirred vessel inwall;
in the process adding saturation water luffa fibers, add remaining cement and sand in batches, stir 3 minutes, luffa fibers is uniformly dispersed, adds 460kg water, continue stirring 3 minutes, luffa fibers is disperseed further.
Embodiment 7
The toughness reinforcing crack resist at mortar of a kind of luffa fibers, raw material is 1m
3mortar raw materials used (cement 920kg, sand 1380kg, water 460 kg) and 900g luffa fibers.
During preparation, 1. the 900g luffa fibers of 1 ~ 1.5cm is soaked in water, makes its moisture adsorbing maximum become saturation water luffa fibers; 2. first in 500kg cement, add 700kg sand to stir, slowly spill into saturation water luffa fibers, notice that saturation water luffa fibers is not dispersed on stirred vessel inwall;
in the process adding saturation water luffa fibers, add remaining cement and sand in batches, stir 3 minutes, luffa fibers is uniformly dispersed, adds 460kg water, continue stirring 3 minutes, luffa fibers is disperseed further.
Luffa fibers in embodiment 1-7 adopts following methods to obtain: chalina is first cut into sponge gourd section, sponge gourd section is torn into single sponge gourd silk, and 1 ~ 1.5cm cut short into by sponge gourd silk.
Embodiment 8
The toughness reinforcing crack resist at mortar of a kind of luffa fibers, raw material is 1m
3mortar (cement 920kg, sand 1380kg, water 460 kg) and 400g modification luffa fibers.
The preparation of modification luffa fibers: chalina is first cut into sponge gourd section, sponge gourd section is torn into single sponge gourd silk, then add in 2% mass concentration LiOH solution, 2h is boiled at 100 DEG C, then distilled water repetitive scrubbing is used, until during scavenging solution last by pH value detection paper, till when its pH value is 7, again by cleaned sponge gourd silk at 60 DEG C dry 6 hours, then cut short into 1 ~ 1.5cm modification luffa fibers.
During preparation, 1. 1 ~ 1.5cm modification luffa fibers is soaked in water, makes its moisture adsorbing maximum become saturation water modification luffa fibers; 2. first in 500kg cement, add 700kg sand to stir, slowly spill into saturation water modification luffa fibers, notice that saturation water modification luffa fibers is not dispersed on stirred vessel inwall;
in the process adding saturation water modification luffa fibers, add remaining cement and sand in batches, stir 3 minutes, modification luffa fibers is uniformly dispersed, adds 460kg water, continue stirring 3 minutes, modification luffa fibers is disperseed further.
Embodiment 9
The toughness reinforcing crack resist at mortar of a kind of luffa fibers, raw material is 1m
3mortar (cement 920kg, sand 1380kg, water 460 kg) and 800g modification luffa fibers.
The preparation of modification luffa fibers: chalina is first cut into sponge gourd section, sponge gourd section is torn into single sponge gourd silk, then add in 10% mass concentration LiOH solution, 2h is boiled at 100 DEG C, then distilled water repetitive scrubbing is used, until during scavenging solution last by pH value detection paper, till when its pH value is 7, again by cleaned sponge gourd silk at 60 DEG C dry 6 hours, then cut short into 1 ~ 1.5cm modification luffa fibers.
During preparation, 1. 1 ~ 1.5cm modification luffa fibers is soaked in water, makes its moisture adsorbing maximum become saturation water modification luffa fibers; 2. first in 500kg cement, add 700kg sand to stir, slowly spill into saturation water modification luffa fibers, notice that saturation water modification luffa fibers is not dispersed on stirred vessel inwall;
in the process adding saturation water modification luffa fibers, add remaining cement and sand in batches, stir 3 minutes, modification luffa fibers is uniformly dispersed, adds 460kg water, continue stirring 3 minutes, modification luffa fibers is disperseed further.
Embodiment 10
The toughness reinforcing crack resist at mortar of a kind of luffa fibers, raw material is 1m
3mortar (cement 920kg, sand 1380kg, water 460 kg) and 600g modification luffa fibers.
The preparation of modification luffa fibers: chalina is first cut into sponge gourd section, sponge gourd section is torn into single sponge gourd silk, then add in 12% mass concentration LiOH solution, 2h is boiled at 100 DEG C, then distilled water repetitive scrubbing is used, until during scavenging solution last by pH value detection paper, till when its pH value is 7, again by cleaned sponge gourd silk at 60 DEG C dry 6 hours, then cut short into 1 ~ 1.5cm modification luffa fibers.
During preparation, 1. 1 ~ 1.5cm modification luffa fibers is soaked in water, makes its moisture adsorbing maximum become saturation water modification luffa fibers; 2. first in 500kg cement, add 700kg sand to stir, slowly spill into saturation water modification luffa fibers, notice that saturation water modification luffa fibers is not dispersed on stirred vessel inwall;
in the process adding saturation water modification luffa fibers, add remaining cement and sand in batches, stir 3 minutes, modification luffa fibers is uniformly dispersed, adds 460kg water, continue stirring 3 minutes, modification luffa fibers is disperseed further.
In above embodiment, the tap density of natural sand used is 1380 kg/ m
3.
Case of comparative examples
Ordinary mortar, raw material cement 920 kg, sand 1380kg and water 460kg, first by cement and sand mixing, then add water and stir evenly.
Detect the crack index of the toughness reinforcing crack resist at mortar of luffa fibers that above embodiment obtains, anti-cracking performance ratio, result is as following table 1:
| Crack index | Anti-cracking performance ratio (%) | Luffa fibers volume | |
| Embodiment 1 | 2570 | 20.1 | 300 |
| Embodiment 2 | 2398 | 25.4 | 400 |
| Embodiment 3 | 2292 | 28.7 | 500 |
| Embodiment 4 | 2157 | 32.9 | 600 |
| Embodiment 5 | 2365 | 26.4 | 700 |
| Embodiment 6 | 2416 | 24.9 | 800 |
| Embodiment 7 | 2492 | 22.5 | 900 |
| Embodiment 8 | 545 | 83 | 600 |
| Embodiment 9 | 151 | 95.3 | 600 |
| Embodiment 10 | 58 | 98.2 | 600 |
| Case of comparative examples | 3215 | / | / |
Found out by above data, when not adding luffa fibers, the crack index of plain mortar 24h is 3215; In mortar, add unmodified luffa fibers, have certain reinforced effects, its adding proportion is at 400 ~ 800g/m
3scope is better (with 600 g/m
3for best), 24h crack index is between 2157 ~ 2416, and corresponding anti-cracking performance is than between 24.9 ~ 32.9%; Add modification luffa fibers, its adding proportion is 600 g/m
3, its reinforced mortar resistance to cleavage successful, 24h crack index is 151 ~ 58, and anti-cracking performance ratio is 95.3 ~ 98.2%.
Carry out experiment to the air shrinkage value of mortar to detect, in embodiment 1 ~ 5, unmodified luffa fibers volume is respectively 300g/m
3, 400g/m
3, 500g/m
3, 600g/m
3, 700g/m
3, result is as following table 2:
Table 2 mortar air shrinkage value/10
-6
| Mortar air shrinkage value 1d | Mortar air shrinkage value 3d | Mortar air shrinkage value 7d | Mortar air shrinkage value 14d | Mortar air shrinkage value 21d | Mortar air shrinkage value 28d | Mortar air shrinkage value 90d | |
| Embodiment 1 | 73 | 204 | 529 | 883 | 1071 | 1173 | 1333 |
| Embodiment 2 | 52 | 194 | 510 | 790 | 1098 | 1165 | 1283 |
| Embodiment 3 | 48 | 198 | 419 | 793 | 978 | 1028 | 1256 |
| Embodiment 4 | 41 | 177 | 416 | 742 | 1017 | 1071 | 1208 |
| Embodiment 5 | 44 | 194 | 446 | 750 | 1025 | 1110 | 1220 |
| Case of comparative examples | 77 | 294 | 567 | 883 | 1140 | 1256 | 1506 |
Found out by above data, mixing appropriate luffa fibers in mortar can effectively reduce its shrinkage value, particularly early-age shrinkage, and wherein 1d, 3d, 7d, 14d, 90d mortar air shrinkage value is 600g/m at luffa fibers volume
3reach minimum time (embodiment 4), 21d, 28d mortar air shrinkage value is 500g/m at volume
3reach minimum time (embodiment 3), with embodiment 4(luffa fibers volume 600g/m
3) be example, mixing luffa fibers reduces the most obvious to the shrinkage performance of sand-cement slurry length of time morning (1d, 3d, 7d), can reduce by 45.9%, 39.7% and 27.2% respectively, all the other length of times, (14d, 21d, 28d, 90 d) shrinkage value also can reduce by 10.8 ~ 19.8%.
Table 3 modification luffa fibers mortar air shrinkage value/10
-6
| Mortar air shrinkage value 1d | Mortar air shrinkage value 3d | Mortar air shrinkage value 7d | Mortar air shrinkage value 14d | Mortar air shrinkage value 21d | Mortar air shrinkage value 28d | Mortar air shrinkage value 90d | |
| Embodiment 8 | 52 | 174 | 398 | 662 | 933 | 1045 | 1167 |
| Embodiment 9 | 42 | 160 | 342 | 566 | 893 | 992 | 1139 |
| Embodiment 10 | 42 | 155 | 328 | 540 | 844 | 896 | 1120 |
| Case of comparative examples | 77 | 294 | 567 | 883 | 1140 | 1256 | 1506 |
By finding the experimental study of modification luffa fibers mortar air shrinkage value, mix 600g/m
3modification luffa fibers, mortar 1d, 3d, 7d air shrinkage value can reduce by more than 40%, 14d, 21d, 28d, 90 d shrinkage value can reduce by 25.6 ~ 38.8%, and obviously, the luffa fibers Mortar shrinkage value through modification reduces more obvious.
The cracking test of mortar is carried out with reference to " fibrous concrete test method standard CECS13:2009 " and " sand-cement slurry resistance to cleavage test method JC/T951-2005 ".The test of mortar air shrinkage value is carried out according to " building mortar basic performance tests method standard JGJ/T70-2009 ".
Claims (2)
1. the toughness reinforcing crack resist at mortar of luffa fibers, is characterized in that: 1m
3raw material needed for mortar and 300-900g luffa fibers; Described 1m
3raw material needed for mortar is cement, Sha Heshui; Described cement, sand and quality are than being 1:1.5:0.5 ~ 0.8; Described luffa fibers is modification luffa fibers, modification luffa fibers adopts following methods to obtain: chalina is first cut into sponge gourd section, sponge gourd section is torn into single sponge gourd silk, then add in 2-12% mass concentration LiOH solution, boil 1-3h, then use distilled water repetitive scrubbing, until during scavenging solution last by pH value detection paper, till when its pH value is 7, more cleaned sponge gourd silk is dry, then cut short into 1 ~ 1.5cm modification luffa fibers.
2. prepare the method for the toughness reinforcing crack resist at mortar of luffa fibers described in claim 1, it is characterized in that:
Comprise the following steps:
1. chalina is first cut into sponge gourd section, sponge gourd section is torn into single sponge gourd silk, then add in 2-12% mass concentration LiOH solution, boil 1-3h, then distilled water repetitive scrubbing is used, until during scavenging solution last by pH value detection paper, till when its pH value is 7, again that cleaned sponge gourd silk is dry, then cut short into 1 ~ 1.5cm modification luffa fibers;
2. modification luffa fibers is soaked in water, makes its moisture adsorbing maximum become saturated modified water luffa fibers;
3. first in part of cement, add part sand to stir, add saturated modified water luffa fibers, notice that saturation water luffa fibers is not dispersed on stirred vessel inwall;
4. in the process adding saturated modified water luffa fibers, add remaining cement and sand in batches, stir and modification luffa fibers is uniformly dispersed, add water, continue stirring and modification luffa fibers is disperseed further.
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| CN201310434771.7A CN103482893B (en) | 2013-09-23 | 2013-09-23 | Application of loofah fibers in mortar and loofah fiber toughening and anti-cracking mortar |
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| CN201310434771.7A CN103482893B (en) | 2013-09-23 | 2013-09-23 | Application of loofah fibers in mortar and loofah fiber toughening and anti-cracking mortar |
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| CN104211316B (en) * | 2014-08-19 | 2016-08-10 | 华北水利水电大学 | A kind of toughness reinforcing crack resist at mortar of luffa fibers, preparation method and application |
| CN112408920A (en) * | 2020-12-11 | 2021-02-26 | 深圳市恒星建材有限公司 | High-ductility ready-mixed fiber concrete and preparation method thereof |
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| CN1128314A (en) * | 1994-10-24 | 1996-08-07 | 高桥健吉 | Light concrete products |
| CN101244915A (en) * | 2008-03-25 | 2008-08-20 | 武汉理工大学 | Ultra-plasticizing gravity flow flat crack resistant mortar |
| WO2013002508A3 (en) * | 2011-06-30 | 2013-02-28 | 코오롱글로벌주식회사 | Fiber-reinforced concrete composition for a containment building of a nuclear power plant |
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- 2013-09-23 CN CN201310434771.7A patent/CN103482893B/en not_active Expired - Fee Related
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|---|---|---|---|---|
| CN1128314A (en) * | 1994-10-24 | 1996-08-07 | 高桥健吉 | Light concrete products |
| CN101244915A (en) * | 2008-03-25 | 2008-08-20 | 武汉理工大学 | Ultra-plasticizing gravity flow flat crack resistant mortar |
| WO2013002508A3 (en) * | 2011-06-30 | 2013-02-28 | 코오롱글로벌주식회사 | Fiber-reinforced concrete composition for a containment building of a nuclear power plant |
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