CN107963853A

CN107963853A - A kind of preparation method of durable self-cure type concrete

Info

Publication number: CN107963853A
Application number: CN201711130295.4A
Authority: CN
Inventors: 周荣; 杨亚生; 张建初
Original assignee: Individual
Current assignee: Individual
Priority date: 2017-11-15
Filing date: 2017-11-15
Publication date: 2018-04-27

Abstract

The present invention relates to technical field of concrete preparation, and in particular to a kind of preparation method of durable self-cure type concrete.The present invention is in calcium carbonate surface loading microorganisms, the organic acid of generation and concrete neutral and alkali substance reaction, so as to form crystalline solid not soluble in water, crystalline solid constantly grows and realizes micro-cracks self-healing, so as to achieve the purpose that concrete durability, phenol enters inside Portland cement stratum granulosum, and polymerisation occurs in inside, improve the durability of concrete, calcium carbonate surface loading microorganisms, bacterial spore and nutriment are effectively filled in inside concrete hole, form self-healing property protective layer, the bacterial spore being activated, effectively bear the high alkalinity environment of concrete, be conducive to the decomposition of calcium carbonate, in the life cycle of concrete structure, crystalline solid is continuously grown, so as to reach the durability self-healing repairing effect of concrete, it is with a wide range of applications.

Description

A kind of preparation method of durable self-cure type concrete

Technical field

The present invention relates to technical field of concrete preparation, and in particular to a kind of preparation method of durable self-cure type concrete.

Background technology

Concrete is most popular construction material, and a kind of typical fragile material in the world.Using process In can produce cracking or local damage under external force or other factors effect, cause mechanical property and endurance quality to reduce, even It is also possible to trigger macrocrack and brittle fracture occurs, causes to be difficult to the loss retrieved to society.

At present, mainly there are two kinds for the repair materials of distress in concrete, be inorganic repair materials, organic reparation material respectively Material.Inorganic repair materials are primarily referred to as cement base repair materials, its application range is the most extensive, technology also comparative maturity, but Adhesive property is bad in application process；Organic repair materials be using with certain reparation characteristic organic matter as reparation host agent, It is aided with the blending of the organic substances such as toughener, initiator and coupling agent together, makes it have the effect to distress in concrete reparation Fruit, compared with inorganic repair materials, it is with the high characteristic of adhesion strength, but most of organic matter belongs to noxious material, makes Should try one's best the injury avoided to the person during.The Concrete crack repair material that in the market is possessed is mostly by repairing material Expect that the hardening of itself fills up reparations complete crack, its performance to concrete substrate itself is without the too big improvement of progress.

Built-in microorganism is current most common autogenous healing conjunction technology, the activity and alkali resistance of microorganism etc. to self-healing Conjunction property has a great influence.In recent years, the biochemistry behavior that microorganism causes precipitation of calcium carbonate to produce receives much concern.There is scholar to point out Microorganism makes it become a kind of suitable to fill as the precursor compound that a kind of main additive catalysis is built in concrete Filling chock material is the dominant mechanism of microbial action crack self-healing.Microorganism self-repairing system is the reparation of concrete substrate microcrack Effectively delay a kind of potentially hazardous high cost for providing new method, saving needed for substantial amounts of exterior reparation, and Its security and durability are also greatly improved, and the service life of concrete will also extend.

Existing microorganism self-repairing system also has the following disadvantages：1st, part microorganism self-repairing system culture medium is outer What boundary manually provided, selfreparing needs human intervention；2nd, the life cycle of microorganism wants long enough, suitable with concrete structure, In the case where being directly added into microorganism, microbial activity can be subject to the overbasic suppression of concrete, the existence of spore and development energy Power can diminish with the age of concrete elongated gap and gradually reduce, and life span is less than four months, after death microbes decomposition, Have an impact to concrete strength；The 3rd, although substantial amounts of non-pressure three-product cyclone has little to no effect intensity, various organic-biologicals And the presence of presoma metaplasia thing causes concrete crushing strength to reduce.

Therefore, developing a kind of self-cure type concrete that can solve above-mentioned performance issue is highly desirable.

The content of the invention

The technical problems to be solved by the invention：Long enough is wanted for the life cycle of current microorganism, with concrete knot Structure is suitable, and in the case where being directly added into microorganism, microbial activity can be subject to the overbasic suppression of concrete, the existence of spore It can diminish with developmental potency with the age of concrete elongated gap and gradually reduce, life span is less than four months, after death micro- life Thing can decompose, defect influential on concrete strength, there is provided a kind of preparation method of durable self-cure type concrete.

In order to solve the above technical problems, the present invention is using technical solution as described below：

A kind of preparation method of durable self-cure type concrete, it is characterised in that specifically preparation process is：

（1）Weigh 1.0~1.2kg Portland cements to grind, abrasive flour is collected, by abrasive flour, acetone and benzene Phenol is mixed, and obtains mixed slurry, after Silane coupling reagent KH-570 and mixed slurry are mixed, is placed in drying in baking oven It is dry, dried object and ground 100 mesh sieve are collected, obtains modified cement granules；

（2）Weigh 6~8g dipotassium hydrogen phosphates, 4~6g potassium dihydrogen phosphates, 8~10g sucrose, 2~4g sodium chloride, 1~3g magnesium sulfate It is mixed with 2~4g citric acids, obtains mixture, mixture and deionized water is mixed to be placed in mixer and stirred, is obtained Self-made mixture, and the pH value of Self-made mixture is adjusted, count in parts by weight, weigh 24~36 parts of calcium carbonate and 16~20 respectively Part Self-made mixture mixing, which is placed in fermentation tank, stirs, then adds 10~12 parts of Bacillus sphaericus bacteria suspensions, is sealed by fermentation, obtains To tunning, fermentation-derived product, removes ferment filtrate, obtains fermentation filter residue；

（3）Lard and sesame oil are mixed, obtain miscella, continues to add 1~2 times of natural pond of mixing oil quality to miscella Liquid, is fitted into the fermentation tank with oxygen, is sealed by fermentation and aoxidizes, and after fermentation oxidation, takes out tunning, is to be formed with certainly Machine acid；

（4）Count in parts by weight, weigh respectively 20~30 parts of modified cement granules, 16~20 parts fermentation filter residues, 10~12 parts from Organic acid processed and the mixing of 18~24 parts of deionized waters are placed in mixer and stir, then add 3~5 parts of flyash, 4~6 parts of rubbles, 2~4 parts of lignosulfonates, 1~3 part of cement expansive material AEA and 5~7 parts of river sands, continue to be mixed, discharging, you can are made Durable self-cure type concrete.

Step（1）The time that grinds is 6~8min, and the mass ratio of abrasive flour, acetone and phenol is 1：2： 3, mixing time is 12~16min, and the volume ratio of Silane coupling reagent KH-570 and mixed slurry is 1：4, mixing time for 10~ 12min, drying temperature are 65~75 DEG C, and drying time is 24~32min.

Step（2）The mixing time is 6~8min, and the mass ratio of mixture and deionized water is 1：4, whipping temp For 24~28 DEG C, mixing time is 16~20min, adjust Self-made mixture pH value be 7.0~7.2, be mixed the time be 12~16min, the bacterial content of Bacillus sphaericus bacteria suspension is 10⁷Cfu/mL, fermentation temperature are 35~45 DEG C, and fermentation time is 9~11 days.

Step（3）The lard and the mass ratio of sesame oil are 2：1, mixing time is 4~6min, oxidizing temperature of fermenting For 30~36 DEG C, fermentation oxidization time is 8~10 days.

Step（4）The mixing time is 20~30min, and continuation mixing time is 1~3h.

Compared with other methods, advantageous effects are the present invention：

（1）The present invention is using calcium carbonate as carrier, and using carrier surface loading microorganisms, acid occurs for grease under microbial action Lose, and produce organic acid, neutralization reaction occurs with concrete neutral and alkali material, forms crystalline solid not soluble in water, especially exists In alternation of wetting and drying cyclic process, crystallization process is activated repeatedly, and in the life cycle of concrete structure, crystalline solid is constant Ground grows and realizes micro-cracks self-healing, so as to achieve the purpose that concrete durability, first with silane coupling agent to general Logical portland cement surface is modified, and estersil base is formed silanol group, silanol group and ordinary silicon after hydrolysis occurs with water Hydroxyl reaction occurs for acid salt cement surface, then forms part covalent bond by drying and dehydrating, and final silane coupling agent is in ordinary silicon Acid salt cement surface forms polymolecular cover layer, changes the intrinsic hydrophilic nmature of Portland cement, at the same to its surface into Row aluminum coated steel, is entered inside Portland cement stratum granulosum by phenol, and polymerisation occurs in inside, improves material Interlamellar spacing, improves organic Interface adhesive strength between inorganic particle, makes its modified as interface cohesion agent, particle is to coagulation Native internal void is effectively filled, simultaneously because two alternate combination power greatly enhance, enables the intensity of concrete effective Improve, improve the durability of concrete again；

（2）The present invention contains abundant Bacillus sphaericus in calcium carbonate surface loading microorganisms, wherein microorganism, with bacterium spore Son and nutriment are effectively filled in inside concrete hole as particle, self-healing property protective layer are formd, due in air Carbon dioxide, there is free carbon dioxide and carbonate ions in water, be easy to occur with the calcium ion that calcium hydroxide provides Reaction, and calcium carbonate crystal is formed, play the role of blind, filling capillary channel, in addition bacterial spore is in dormancy shape Under state, crack and them are activated until water enters, and start draw nutrient, produce lime stone, microorganism energy used in particle Enough make generation organic acid spoiled by rancid oil or fat, effectively bear the high alkalinity of concrete, and produce substantial amounts of heat, be conducive to calcium carbonate Decomposition, crystallization process activated repeatedly, and in the life cycle of concrete structure, crystalline solid is continuously grown so that Reach the durability self-healing repairing effect of concrete, be with a wide range of applications.

Embodiment

Weigh 1.0~1.2kg Portland cements and grind 6~8min, collect abrasive flour, be in mass ratio 1： 2：12~16min is mixed in abrasive flour, acetone and phenol by 3, is obtained mixed slurry, is by volume 1：4 is even by silane After joining 10~12min of agent KH-570 and mixed slurry mixing, it is placed in baking oven, 24 is dried at being 65~75 DEG C in temperature ~32min, collects dried object and ground 100 mesh sieve, obtains modified cement granules；Weigh 6~8g dipotassium hydrogen phosphates, 4~6g 6~8min is mixed in potassium dihydrogen phosphate, 8~10g sucrose, 2~4g sodium chloride, 1~3g magnesium sulfate and 2~4g citric acids, obtains It is 1 in mass ratio by mixture and deionized water to mixture：4 mixing are placed in mixer, are stirred at being 24~28 DEG C in temperature 16~20min is mixed, obtains Self-made mixture, and the pH value for adjusting Self-made mixture is counted, respectively in parts by weight to 7.0~7.2 Weigh 24~36 parts of calcium carbonate and 16~20 parts of Self-made mixture mixing are placed in 12~16min of stirring in fermentation tank, then add 10 ~12 parts of bacterial contents are 10⁷The Bacillus sphaericus bacteria suspension of cfu/mL, 9~11 are sealed by fermentation at being 35~45 DEG C in temperature My god, tunning is obtained, fermentation-derived product, removes ferment filtrate, obtains fermentation filter residue；It is 2 in mass ratio：1 by lard and 4~6min is mixed in sesame oil, obtains miscella, continues to add mixing 1~2 times of biogas slurry of oil quality to miscella, loads band Have in the fermentation tank of oxygen, oxidation 8~10 days is sealed by fermentation at being 30~36 DEG C in temperature, after fermentation oxidation, takes out hair Ferment product, as makes organic acid by oneself；Count in parts by weight, weigh 20~30 parts of modified cement granules, 16~20 parts of fermentations respectively Filter residue, 10~12 parts of self-control organic acids and 18~24 parts of deionized water mixing are placed in 20~30min of stirring in mixer, then add 3~5 parts of flyash, 4~6 parts of rubbles, 2~4 parts of lignosulfonates, 1~3 part of cement expansive material AEA and 5~7 parts of river sands, after It is continuous that 1~3h, discharging is mixed, you can durable self-cure type concrete is made.

Example 1

Weigh 1.0kg Portland cements and grind 6min, collect abrasive flour, be in mass ratio 1：2：3 by grounds travel 12min is mixed in end, acetone and phenol, obtains mixed slurry, is by volume 1：4 by Silane coupling reagent KH-570 and mixing After 10min is mixed in slurry, it is placed in baking oven, 24min is dried at being 65 DEG C in temperature, collection dried object is simultaneously ground 100 mesh sieves, obtain modified cement granules；Weigh 6g dipotassium hydrogen phosphates, 4g potassium dihydrogen phosphates, 8g sucrose, 2g sodium chloride, 1g sulfuric acid 6min is mixed in magnesium and 2g citric acids, obtains mixture, is 1 in mass ratio by mixture and deionized water：4 mixing, which are placed in, stirs Mix in machine, stir 16min at being 24 DEG C in temperature, obtain Self-made mixture, and the pH value for adjusting Self-made mixture is pressed to 7.0 Parts by weight meter, weighs 24 parts of calcium carbonate respectively and 16 parts of Self-made mixture mixing are placed in fermentation tank and stir 12min, then adds 10 parts of bacterial contents are 10⁷The Bacillus sphaericus bacteria suspension of cfu/mL, is sealed by fermentation 9 days at being 35 DEG C in temperature, is fermented Product, fermentation-derived product, removes ferment filtrate, obtains fermentation filter residue；It is 2 in mass ratio：1 stirs lard and sesame oil mixing 4min is mixed, obtains miscella, continues to add mixing 1 times of biogas slurry of oil quality to miscella, is fitted into the fermentation tank with oxygen, Temperature is that oxidation 8 days is sealed by fermentation at 30 DEG C, after fermentation oxidation, takes out tunning, as makes organic acid by oneself；By weight Number meter, weighs 20 parts of modified cement granules, 16 parts of fermentation filter residues, 10 parts of self-control organic acids and 18 parts of deionized water mixing respectively It is placed in mixer and stirs 20min, then adds 3 parts of flyash, 4 parts of rubbles, 2 parts of lignosulfonates, 1 portion of cement expansive material AEA and 5 part of river sand, continues that 1h, discharging is mixed, you can durable self-cure type concrete is made.

Example 2

Weigh 1.1kg Portland cements and grind 7min, collect abrasive flour, be in mass ratio 1：2：3 by grounds travel 14min is mixed in end, acetone and phenol, obtains mixed slurry, is by volume 1：4 by Silane coupling reagent KH-570 and mixing After 11min is mixed in slurry, it is placed in baking oven, 28min is dried at being 70 DEG C in temperature, collection dried object is simultaneously ground 100 mesh sieves, obtain modified cement granules；Weigh 7g dipotassium hydrogen phosphates, 5g potassium dihydrogen phosphates, 9g sucrose, 3g sodium chloride, 2g sulfuric acid 7min is mixed in magnesium and 3g citric acids, obtains mixture, is 1 in mass ratio by mixture and deionized water：4 mixing, which are placed in, stirs Mix in machine, stir 18min at being 26 DEG C in temperature, obtain Self-made mixture, and the pH value for adjusting Self-made mixture is pressed to 7.1 Parts by weight meter, weighs 30 parts of calcium carbonate respectively and 18 parts of Self-made mixture mixing are placed in fermentation tank and stir 14min, then adds 11 parts of bacterial contents are 10⁷The Bacillus sphaericus bacteria suspension of cfu/mL, is sealed by fermentation 10 days at being 40 DEG C in temperature, is fermented Product, fermentation-derived product, removes ferment filtrate, obtains fermentation filter residue；It is 2 in mass ratio：1 stirs lard and sesame oil mixing 5min is mixed, obtains miscella, continues to add mixing 1 times of biogas slurry of oil quality to miscella, is fitted into the fermentation tank with oxygen, Temperature is that oxidation 9 days is sealed by fermentation at 33 DEG C, after fermentation oxidation, takes out tunning, as makes organic acid by oneself；By weight Number meter, weighs 25 parts of modified cement granules, 18 parts of fermentation filter residues, 11 parts of self-control organic acids and 21 parts of deionized water mixing respectively It is placed in mixer and stirs 25min, then adds 4 parts of flyash, 5 parts of rubbles, 3 parts of lignosulfonates, 2 portions of cement expansive materials AEA and 6 part of river sand, continues that 2h, discharging is mixed, you can durable self-cure type concrete is made.

Example 3

Weigh 1.2kg Portland cements and grind 8min, collect abrasive flour, be in mass ratio 1：2：3 by grounds travel 16min is mixed in end, acetone and phenol, obtains mixed slurry, is by volume 1：4 by Silane coupling reagent KH-570 and mixing After 12min is mixed in slurry, it is placed in baking oven, 32min is dried at being 75 DEG C in temperature, collection dried object is simultaneously ground 100 mesh sieves, obtain modified cement granules；Weigh 8g dipotassium hydrogen phosphates, 6g potassium dihydrogen phosphates, 10g sucrose, 4g sodium chloride, 3g sulphur 8min is mixed in sour magnesium and 4g citric acid, obtains mixture, is 1 in mass ratio by mixture and deionized water：4 mixing are placed in In mixer, 20min is stirred at being 28 DEG C in temperature, obtains Self-made mixture, and adjust the pH value of Self-made mixture to 7.2, Count in parts by weight, weigh 36 parts of calcium carbonate respectively and 20 parts of Self-made mixture mixing are placed in fermentation tank and stir 16min, then add It is 10 to add 12 parts of bacterial contents⁷The Bacillus sphaericus bacteria suspension of cfu/mL, is sealed by fermentation 11 days at being 45 DEG C in temperature, is sent out Ferment product, fermentation-derived product, removes ferment filtrate, obtains fermentation filter residue；It is 2 in mass ratio：1 mixes lard and sesame oil 6min is stirred, obtains miscella, continues to add mixing 2 times of biogas slurries of oil quality to miscella, is fitted into the fermentation tank with oxygen, Oxidation 10 days is sealed by fermentation at being 36 DEG C in temperature, after fermentation oxidation, tunning is taken out, as makes organic acid by oneself；Press Parts by weight meter, weighs 30 parts of modified cement granules, 20 parts of fermentation filter residues, 12 parts of self-control organic acids and 24 parts of deionized waters respectively Mixing, which is placed in mixer, stirs 30min, then adds 5 parts of flyash, 6 parts of rubbles, 4 parts of lignosulfonates, 3 parts of concrete expansions Agent AEA and 7 parts of river sands, continue that 3h, discharging is mixed, you can durable self-cure type concrete is made.

Comparative example

With the self-cure type concrete of company of Zhengzhou City production as a comparison case to durable self-cure type concrete produced by the present invention It is detected with the self-cure type concrete in comparative example, testing result is as shown in table 1：

1st, mechanical strength is tested

It is measured using universal testing machine.

2nd, crackle self-healing contrast test

Example 1~3 and comparative example prepared by the present invention digs out 0.4mm cracks, observes crack healing time.

3rd, alkali resistance test

Example 1~3 and comparative example test block prepared by the present invention put into the Mgcl of saturation after maintenance₂Soak, carry out in solution Observation.Test block is water-tight, illustrates the CaSiO that reaction produces₃With Barbiturates in seawater（The wherein Mgcl of most causticity₂）But do not occur Reaction, thus the concrete have prevent the effect of sea water intrusion and alkaline-resisting effect.

4th, endurancing

According to GB/T50476-2008《Durability design specification》It is detected.

Table 1

Test event	Example 1	Example 2	Example 3	Comparative example
					Intensity level（MPa）	179	183	185	162
The self-healing time（d）	20	19	17	65
					Alkali resistance test（Range estimation）	Test block not water outlet	Test block not water outlet	Test block not water outlet	There is water outlet phenomenon in test block
Durability	Free from flaw produces	Free from flaw produces	Free from flaw produces	Internal a little crack produces

According to data in table 1, durable self-cure type concrete mechanics intensity produced by the present invention is high, crackle self-healing speed is fast, Alkali resistance is strong, hence it is evident that better than comparative example.Therefore, there is wide prospect of the application.

Claims

1. a kind of preparation method of durable self-cure type concrete, it is characterised in that specifically preparation process is：

A kind of 2. preparation method of durable self-cure type concrete according to claim 1, it is characterised in that：Step（1）Institute The time that grinds stated is 6~8min, and the mass ratio of abrasive flour, acetone and phenol is 1：2：3, mixing time for 12~ The volume ratio of 16min, Silane coupling reagent KH-570 and mixed slurry is 1：4, mixing time is 10~12min, and drying temperature is 65~75 DEG C, drying time is 24~32min.

A kind of 3. preparation method of durable self-cure type concrete according to claim 1, it is characterised in that：Step（2）Institute The mixing time stated is 6~8min, and the mass ratio of mixture and deionized water is 1：4, whipping temp is 24~28 DEG C, during stirring Between be 16~20min, the pH value for adjusting Self-made mixture is 7.0~7.2, and the mixing time is 12~16min, spherical gemma The bacterial content of bacillus bacteria suspension is 10⁷Cfu/mL, fermentation temperature are 35~45 DEG C, and fermentation time is 9~11 days.

A kind of 4. preparation method of durable self-cure type concrete according to claim 1, it is characterised in that：Step（3）Institute The lard and the mass ratio of sesame oil stated are 2：1, mixing time is 4~6min, and fermentation oxidizing temperature is 30~36 DEG C, fermentation oxygen It is 8~10 days to change the time.

A kind of 5. preparation method of durable self-cure type concrete according to claim 1, it is characterised in that：Step（4）Institute The mixing time stated is 20~30min, and continuation mixing time is 1~3h.