CN102633456B - Heavy-weight concrete internal curing material and preparation method thereof - Google Patents
Heavy-weight concrete internal curing material and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a heavy-weight concrete internal curing material and a preparation method thereof. The preparation method comprises the following steps of: weighing aluminum oxide industrial solid wastes to waste glass powder to alkali carbonate to be equal to (0.87-0.95): (0.04-0.09): (0.01-0.04) according to weight ratio; adding water into the raw materials; blending; forming; and high-temperature firing at the firing temperature of 900 DEG C-1100 DEG C to obtain the material. On one hand, the heavy-weight concrete internal curing material adopts the aluminum oxide industrial solid wastes and the waste glass as basic raw materials, so that the industrial wastes can be utilized effectively, and the cost of the materials can be reduced; and on the other hand, compared with the existing other internal curing materials, the performance density of the heavy-weight concrete internal curing material after water absorption is approximate to the density of cement mortar in concrete, so that the nonuniformity of the concrete applied with 'internal curing' technology can be effectively reduced.
Description
Technical field
The invention belongs to the ceramic class, be specifically related to conserving material and preparation method thereof in a kind of heavy concrete.
Background technology
A difficult point during high-strength concrete is used is the caused early stage cracking of its high contraction.This cracking accelerates extraneous etching medium to the corrosion of reinforcing bar in concrete and structure, causes the concrete structure security to reduce.American scholar " five times of laws " figuratively speaking clear concrete cracking impact on structure: to new project, 1 dollar of every saving, repair when finding steel bar corrosion needs to append 5 dollars more, append 25 dollars of maintenance costs more during concrete cracking, append 125 dollars of maintenance costs more during havoc." five times of laws " illustrates that concrete cracking more is difficult to repair than steel bar corrosion to structural damage, and the loss that causes is larger.This fearful scale effect impels national governments to drop into the research that substantial contribution is used for the control of concrete structure cracking.
Self-constriction is the major cause that causes the high-strength concrete cracking.Because the high-strength concrete water-cement ratio is low, the aquation of cement descends inside concrete humidity greatly, and the moisture in concrete pore forms the very large meniscus of radian, causes " self-desiccation " phenomenon.The high-strength concrete pore dimension is little, and due to the effect of capillary effect, " self-desiccation " phenomenon makes the very large tensile stress of generation on the concrete hole wall, thereby produces the contraction more much bigger than dry shrinkage in concrete, and this contraction is called as self-constriction.In order to reduce concrete contraction, with full water porous material (natural or artificial light-weight aggregate, porous polymer material) mix in concrete as interior conserving material, its institute moisture under effect under the poor and psychrometric difference of capillary pressure to the concrete internal diffusion, play " interior maintenance " effect, improve inside concrete relative humidity, reduce concrete self-shrinkage and dry shrinkage; Simultaneously because hydrated cementitious is the reaction that solid volume increases, and the water in porous material does not account for volume in concrete, therefore in, maintenance action is promoting not make it produce volumetric expansion in hydrated cement particle aquation, further reduced concrete contraction, thereby effectively suppressed concrete tearing tendency, particularly early stage tearing tendency, and concrete is expanded in confined conditions.
at present interior conserving material used uses to alleviate weight concrete or thermal conductivity and is the natural or artificial light-weight aggregate of purpose, or porous polymer material, be 201110228108.2 as number of patent application, name is called a kind of internal curing material of high-performance concrete and preparation method thereof, the interior conserving material of its invention comprises that following component and content (mass parts) are: swelling agent 100, organic high water absorption material 1.0～5.0, inorganic water-absorbing material 0～50, water-holding agent 0～1.0, weighting agent 0～10, compared with prior art, the concrete of product configuration of the present invention has water conservation, the functions such as interior maintenance and cracking resistance.But in the interior curing agent density ratio concrete of its invention, slurry density is much lower, therefore easily cause preferably the floating of interior conserving material in concrete in mobility, also may smash due to shake in the bad concrete of mobility, pumping former thereby floating, concrete homogeneity is descended; Simultaneously, because its enclose inside pore is many, void content is large, and intensity is more common gathers materials much lowerly, causes mechanical performance of concrete to descend, thereby has limited the application of " interior maintenance " technology in engineering.
Interior maintenance technology is subjected to interior conserving material low density and the puzzlement of layering is long-standing.Present artificial light-weight aggregate or natural light-weight aggregate are used for concrete mainly in order to alleviate concrete weight, improve the material specific tenacity, or reduce the heat conductivility of material.Regulation by " light aggregate concrete utilisation technology rules " (JGJ 51-1990), the density of light aggregate concrete must be less than 1950kg/m3, compare with normal concrete, its density is little more than 300kg/m3, therefore requires artificial light-weight aggregate or the density of natural common gathering materials of light-weight aggregate density ratio (rubble, cobble, sand) much smaller.In order to satisfy low-density requirement, must there be a large amount of pores light-weight aggregate inside.Also require material internal that a large amount of sealed porositys is arranged and will reduce heat conductivility, density of material reduces greatly.Generally be applied to artificial or natural its apparent density of light-weight aggregate in concrete at 1400kg/m3 or lower, intensity is reduced by more common gathering materials of the impact of its internal porosity also greatly.Porous polymer also is super absorbent polymer (Super-absorption polymer) abroad, and its can the heavy hundred times of specific absorption self or the moisture of several thousand times and the swelling water gel has been widely used industrial.But during as interior conserving material, its shortcoming is apparent.The one, the characteristic of super suction makes the density after its suction be in close proximity to 1, and is lower than the density of artificial or natural light-weight aggregate.The 2nd, after this material adds concrete and between concrete mortar without bonding, can not be as one of concrete structure component.Compare with the concrete structure component simultaneously, it does not have intensity substantially, because the problem of layering is not only arranged, also has the problem of strength decreased.
Summary of the invention
In sum, in order to overcome the deficiencies in the prior art, the present invention has developed conserving material and preparation method thereof in a kind of heavy concrete, the present invention utilizes trade waste, and in the heavy concrete of preparation, conserving material can reduce the cost of material take aluminum oxide industry solid waste, discarded glass as basic raw material.In the heavy concrete of the present invention preparation conserving material is mainly for conserving material low density and low intensive problem in existing, forms and the adjusting of preparation process achieves high-density, high strength by material, solved simultaneously this two problems.
For achieving the above object, the technical solution used in the present invention is:
Conserving material in a kind of heavy concrete, adding by a certain percentage water by aluminum oxide industry solid waste, cullet powder and alkaline carbonate mixes and stirs, moulding, high temperature burns till gained under the firing temperature of 900 ℃～1100 ℃, and wherein said various raw material weights are than being the aluminum oxide industry solid waste: cullet powder: alkaline carbonate=(0.87～0.95): (0.04～0.09): (0.01～0.04).
Further, described aluminum oxide industry solid waste be red mud or/and the aluminum oxide mine tailing or/and the mixture of the lower aluminum ore of grade, mixture is that arbitrary proportion mixes.
Further, described cullet powder is that the building glass that will reclaim is crossed the screen underflow of 80 mesh sieves after grinding.
Further, described alkaline carbonate is Na
2CO
3Or/and NaHCO
3Or/and K
2CO
3Or/and KHCO
3Mixture, mixture is that arbitrary proportion mixes.
The preparation method of conserving material in a kind of heavy concrete comprises the following steps:
The first step, alkaline carbonate preparation: with Na
2CO
3Or/and NaHCO
3Or/and K
2CO
3Or/and KHCO
3Mixture mix thoroughly at stirrer, take out stand-by;
Second step, the preparation of cullet powder: the waste and old building glass that will reclaim is crossed 80 mesh sieves after the ball mill grinding, extracting screen underflow is standby;
The 3rd step, aluminum oxide industry solid waste preparation: with the red mud after drying, grinding or/and the aluminum oxide mine tailing or/and the mixture of the lower aluminum ore of grade mixes the alumina-silica trade waste in forced stirrer;
The 4th step, raw material mix: by weight, aluminum oxide industry solid waste: cullet powder: alkaline carbonate=(0.87～0.95): (0.04～0.09): the ratio of (0.01～0.04), get raw material and put into the forced stirrer stirring and evenly mixing, then add appropriate water, emit mixture after stirring makes raw material reach plastic state in forced stirrer;
The 5th step, moulding: the 4th step gained mixture is put into disk balling machine make diameter 1mm～20mm spheroidal particle;
The 6th step, high-temperature firing: the 5th step gained spheroidal particle is risen to the firing temperature of 900 ℃～1100 ℃ with the heat-up rate of 20 ℃ of-30 ℃/min after dry 20-60min under seasoning 24-48h or 90 ℃ in air, and be cooled to room temperature after insulation 5-20min get final product to get conserving material in the heavy concrete under firing temperature.
Further, to put into the churning time of forced stirrer stirring and evenly mixing be 1min to the raw material of getting in described the 4th step.
Further, add appropriate water in described the 4th step, stirring the churning time that makes raw material reach plastic state in forced stirrer is 2min.
In heavy concrete of the present invention, the conserving material the performance test results sees Table 1.
[0016] positively effect of the present invention is:
1, in heavy concrete of the present invention, conserving material is compared with present artificial or natural light-weight aggregate, porous polymer material, and its apparent density is at 1.7g/cm
3Left and right, water-intake rate are in 20% left and right, and the apparent density after suction is at 2.0 g/cm
3The left and right is with density (the 2.1-2.3 g/cm of sand-cement slurry in concrete
3) approach, can effectively reduce the concrete ununiformity of application " interior maintenance " technology.
2. but the artificial light-weight aggregate of existing high suction need add certain pore-forming material or itself contain the high-temperature gasification material in preparation process, these materials generate gas at a certain temperature and form a large amount of storage pores and hole repeatedly, the light-weight aggregate porosity that is prepared from like this is high, density is little, water-intake rate is higher, and other as natural light-weight aggregate structures such as float stone, vermiculites also similarly.Do not add pore-forming material in the conserving material preparation process in the heavy concrete in the present invention, so its enclose inside hole is few, density of material and intensity are all higher than existing artificial and natural light-weight aggregate; On the other hand, in drying process, the moisture evaporation forms a large amount of open pores at material internal, makes material reach high water absorbing capacity.
3. the present invention take aluminum oxide industry solid waste, discarded glass as basic raw material, can effectively utilize trade waste, can reduce the cost of material simultaneously.
Embodiment
The present invention is described in further detail below in conjunction with specific embodiment.
Embodiment 1
Conserving material and preparation method thereof in a kind of heavy concrete comprises the following steps:
The first step, alkaline carbonate preparation: according to weight ratio K
2CO
3: KHCO
3The ratio of=1:2 is got K
2CO
3And KHCO
3Powder is mixed thoroughly at stirrer, takes out stand-by;
Second step, the preparation of cullet powder: the waste and old building glass that will reclaim is crossed 80 mesh sieves after the ball mill grinding, extracting screen underflow is standby;
The 3rd step, aluminum oxide industry solid waste preparation: by weight red mud: the ratio of aluminum oxide mine tailing=2:8, the red mud after the drying of learning from else's experience, grinding and aluminum oxide mine tailing mix the aluminum oxide industry solid waste in forced stirrer;
The 4th step, raw material mix: by weight the aluminum oxide industry solid waste: the ratio of cullet powder: alkaline carbonate=0.89:0.08:0.03, getting raw material puts into forced stirrer and stirs 1min, then add appropriate water, stir 2min in forced stirrer after, emit mixture after making raw material reach plastic state;
The 5th step, moulding: the 4th step gained mixture is put into disk balling machine make diameter 5mm spheroidal particle;
The 6th step, high-temperature firing: the 5th step gained spheroidal particle is risen to the firing temperature of 950 ℃ with the heat-up rate of 20 ℃/min after seasoning 48h in air, and be cooled to room temperature after insulation 5min under firing temperature, namely get conserving material in the heavy concrete.
Embodiment 2
Conserving material and preparation method thereof in a kind of heavy concrete comprises the following steps:
The first step, alkaline carbonate preparation: get technical grade Na
2CO
3Mix thoroughly at stirrer, take out stand-by;
Second step, the preparation of cullet powder: the waste and old building glass that will reclaim is crossed 80 mesh sieves after the ball mill grinding, extracting screen underflow is standby;
The 3rd step, the preparation of aluminum oxide industry solid waste: the red mud after drying, grinding is stirred in forced stirrer form the aluminum oxide industry solid waste;
The 4th step, raw material mix: by weight the aluminum oxide industry solid waste: the ratio of cullet powder: alkaline carbonate=0.95:0.04:0.01, getting raw material puts into forced stirrer and stirs 1min, then add appropriate water, stir 2min in forced stirrer after, emit mixture after making raw material reach plastic state;
The 5th step, moulding: the 4th step gained mixture is put into disk balling machine make diameter 20mm spheroidal particle;
The 6th step, high-temperature firing: will rise to the firing temperature of 1100 ℃ with the heat-up rate of 30 ℃/min after 90 ℃ of dry 40min of the 5th step gained spheroidal particle, and be cooled to room temperature after insulation 20min under firing temperature, namely get conserving material in the heavy concrete.
Embodiment 3
Conserving material and preparation method thereof in a kind of heavy concrete comprises the following steps:
The first step, alkaline carbonate preparation: according to weight ratio Na
2CO
3: NaHCO
3The ratio of=1:1 is got Na
2CO
3And NaHCO
3Powder is mixed thoroughly at stirrer, takes out stand-by;
Second step, the preparation of cullet powder: the waste and old building glass that will reclaim is crossed 80 mesh sieves after the ball mill grinding, extracting screen underflow is standby;
The 3rd step, the preparation of aluminum oxide industry solid waste: the aluminum oxide mine tailing with after drying, grinding mixes the aluminum oxide industry solid waste in forced stirrer;
The 4th step, raw material mix: by weight the aluminum oxide industry solid waste: the ratio of cullet powder: alkaline carbonate=0.87:0.09:0.04, getting raw material puts into forced stirrer and stirs 1min, then add appropriate water, stir 2min in forced stirrer after, emit mixture after making raw material reach plastic state;
The 5th step, moulding: the 4th step gained mixture is put into disk balling machine make diameter 14mm spheroidal particle;
The 6th step, high-temperature firing: the 5th step gained spheroidal particle is risen to the firing temperature of 1000 ℃ with the heat-up rate of 25 ℃/min after seasoning 30h in air, and be cooled to room temperature after insulation 8min under firing temperature, namely get conserving material in the heavy concrete.
Embodiment 4
Conserving material and preparation method thereof in a kind of heavy concrete comprises the following steps:
The first step, alkaline carbonate preparation: get technical grade NaHCO
3Mix thoroughly at stirrer, take out stand-by;
Second step, the preparation of cullet powder: the waste and old building glass that will reclaim is crossed 80 mesh sieves after the ball mill grinding, extracting screen underflow is standby;
The 3rd step, aluminum oxide industry solid waste: by weight red mud: the ratio of aluminum oxide mine tailing=6:4, the red mud after the drying of learning from else's experience, grinding and aluminum oxide mine tailing mix the aluminum oxide industry solid waste in forced stirrer;
The 4th step, raw material mix: by weight the aluminum oxide industry solid waste: the ratio of cullet powder: alkaline carbonate=0.93:0.04:0.03, getting raw material puts into forced stirrer and stirs 1min, then add appropriate water, stir 2min in forced stirrer after, emit mixture after making raw material reach plastic state;
The 5th step, moulding: the 4th step gained mixture is put into disk balling machine make diameter 1mm spheroidal particle;
The 6th step, high-temperature firing: the 5th step gained spheroidal particle is risen to the firing temperature of 1050 ℃ with the heat-up rate of 25 ℃/min after seasoning 24h in air, and be cooled to room temperature after insulation 10min under firing temperature, namely get conserving material in the heavy concrete.
Embodiment 5
Conserving material and preparation method thereof in a kind of heavy concrete comprises the following steps:
The first step, alkaline carbonate preparation: according to weight ratio NaHCO
3: KHCO
3The ratio of=1:2 is got NaHCO
3And KHCO
3Powder mix thoroughly at stirrer, take out stand-by;
Second step, the preparation of cullet powder: the waste and old building glass that will reclaim is crossed 80 mesh sieves after the ball mill grinding, extracting screen underflow is standby;
The 3rd step, aluminum oxide industry solid waste preparation: by weight red mud: the ratio of aluminum oxide mine tailing=4:6, the red mud after the drying of learning from else's experience, grinding and aluminum oxide mine tailing mix the aluminum oxide industry solid waste in forced stirrer;
The 4th step, raw material mix: by weight the aluminum oxide industry solid waste: the ratio of cullet powder: alkaline carbonate=0.93:0.06:0.01, getting raw material puts into forced stirrer and stirs 1min, then add appropriate water, stir 2min in forced stirrer after, emit mixture after making raw material reach plastic state;
The 5th step, moulding: the 4th step gained mixture is put into disk balling machine make diameter 5mm spheroidal particle;
The 6th step, high-temperature firing: will rise to the firing temperature of 1050 ℃ with the heat-up rate of 28 ℃/min after 90 ℃ of dry 60min of the 5th step gained spheroidal particle, and be cooled to room temperature after insulation 15min under firing temperature, namely get conserving material in the heavy concrete.
Embodiment 6
Conserving material and preparation method thereof in a kind of heavy concrete comprises the following steps:
The first step, alkaline carbonate preparation: according to weight ratio Na
2CO
3: K
2CO
3The ratio of=3:1 is got Na
2CO
3And K
2CO
3Powder mix thoroughly at stirrer, take out stand-by;
Second step, the preparation of cullet powder: the waste and old building glass that will reclaim is crossed 80 mesh sieves after the ball mill grinding, extracting screen underflow is standby;
The 3rd step, aluminum oxide industry solid waste: by weight red mud: the ratio of aluminum oxide mine tailing=7:3, the red mud after the drying of learning from else's experience, grinding and aluminum oxide mine tailing mix the aluminum oxide industry solid waste in forced stirrer;
The 4th step, raw material mix: by weight the aluminum oxide industry solid waste: the ratio of cullet powder: alkaline carbonate=0.92:0.06:0.02, getting raw material puts into forced stirrer and stirs 1min, then add appropriate water, stir 2min in forced stirrer after, emit mixture after making raw material reach plastic state;
The 5th step, moulding: the 4th step gained mixture is put into disk balling machine make diameter 3mm spheroidal particle;
The 6th step, high-temperature firing: will rise to the firing temperature of 1050 ℃ with the heat-up rate of 30 ℃/min after 90 ℃ of dry 30min of the 5th step gained spheroidal particle, and be cooled to room temperature after insulation 10min under firing temperature, namely get conserving material in the heavy concrete.
The interior conserving material performance perameter of standby heavy concrete that embodiment 1 ~ 6 is prepared specifically sees Table 2.
According to pressing " regular concrete sand, stone quality and inspecting standard " (JGJ52-2006) and the standard test of " light-weight aggregate and test method _ part 2 thereof: light-weight aggregate test method " (GB/T 17431.2-1998)
Conserving material performance measured value in the prepared heavy concrete of table 2 example
Data by table 2 can learn, in heavy concrete of the present invention, the apparent density of conserving material is at 1.7g/cm
3Left and right, water-intake rate are in 20% left and right, and the apparent density after suction is at 2.0 g/cm
3The left and right is with density (the 2.1-2.3 g/cm of sand-cement slurry in concrete
3) approach, can effectively reduce the concrete ununiformity of application " interior maintenance " technology.
To illustrate at last it is that aluminum oxide industry solid waste of the present invention can be mixed with any ratio, Na
2CO
3, NaHCO
3, K
2CO
3And KHCO
3Also can mix with any ratio, its different blending ratio all can realize the present invention, does not enumerate example.Other modification that those skilled in the art person makes according to prior art is not as long as exceed thinking and the scope of technical scheme of the present invention, within all should being included in the interest field of requirement of the present invention.
Claims (6)
1. conserving material in a heavy concrete, adding by a certain percentage water by aluminum oxide industry solid waste, cullet powder and alkaline carbonate mixes and stirs, moulding, high temperature burns till gained under the firing temperature of 900 ℃～1100 ℃, and wherein said various raw material weights are than being the aluminum oxide industry solid waste: cullet powder: alkaline carbonate=0.87～0.95:0.04～0.09:0.01～0.04; Described aluminum oxide industry solid waste be red mud or/and the aluminum oxide mine tailing or/and the mixture of the lower aluminum ore of grade.
2. conserving material in heavy concrete according to claim 1, it is characterized in that: described cullet powder is that the building glass that will reclaim is crossed the screen underflow of 80 mesh sieves after grinding.
3. conserving material in heavy concrete according to claim 1, it is characterized in that: described alkaline carbonate is Na
2CO
3Or/and NaHCO
3Or/and K
2CO
3Or/and KHCO
3Mixture.
4. as the preparation method of conserving material in any one heavy concrete of claim 1 ~ 3, it is characterized in that: it comprises the following steps:
The first step, alkaline carbonate preparation: with Na
2CO
3Or/and NaHCO
3Or/and K
2CO
3Or/and KHCO
3Mixture mix thoroughly at stirrer, take out stand-by;
Second step, the preparation of cullet powder: the waste and old building glass that will reclaim is crossed 80 mesh sieves after the ball mill grinding, extracting screen underflow is standby;
The 3rd step, aluminum oxide industry solid waste preparation: with the red mud after drying, grinding or/and the aluminum oxide mine tailing or/and the mixture of the lower aluminum ore of grade mixes the aluminum oxide industry solid waste in forced stirrer;
The 4th step, raw material mix: by weight the aluminum oxide industry solid waste: cullet powder: the ratio of alkaline carbonate=0.87～0.95:0.04～0.09:0.01～0.04, getting raw material puts into forced stirrer and stirs, then add appropriate water, emit mixture after stirring makes raw material reach plastic state in forced stirrer;
The 5th step, moulding: the 4th step gained mixture is put into disk balling machine make diameter 1mm～20mm spheroidal particle;
The 6th step, high-temperature firing: the 5th step gained spheroidal particle is risen to the firing temperature of 900 ℃～1100 ℃ with the heat-up rate of 20 ℃ of-30 ℃/min after dry 20-60min under seasoning 24-48h or 90 ℃ in air, and be cooled to room temperature after insulation 5-20min get final product to get conserving material in the heavy concrete under firing temperature.
5. preparation method according to claim 4 is characterized in that: to put into the churning time of forced stirrer stirring and evenly mixing be 1min to the raw material of getting in described the 4th step.
6. preparation method according to claim 5 is characterized in that: add appropriate water in described the 4th step, stirring the churning time that makes raw material reach plastic state in forced stirrer is 2min.
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| CN115466081B (en) * | 2021-06-10 | 2023-09-19 | 东南大学 | Method for improving internal curing efficiency of cement-based material SAP |
| CN115057651A (en) * | 2022-07-06 | 2022-09-16 | 宁波新盛建材开发有限公司 | Plastic-retaining antifreezing magnesia concrete anti-cracking agent and preparation method thereof |
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Effective date of registration: 20220531 Address after: 454000 No. 416, Jinyuan Road, Wanfang industrial cluster, Macun District, Jiaozuo City, Henan Province Patentee after: Henan gaisen Material Technology Co.,Ltd. Address before: 454950 San Yang Xiang Qian Liu Zhuang, Wuzhi County, Jiaozuo City, Henan Province Patentee before: HENAN QIANGNAI NEW MATERIALS CO.,LTD. |
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