CN106348644B - Composite expansive agents for concrete - Google Patents

Composite expansive agents for concrete Download PDF

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Publication number
CN106348644B
CN106348644B CN201610696804.9A CN201610696804A CN106348644B CN 106348644 B CN106348644 B CN 106348644B CN 201610696804 A CN201610696804 A CN 201610696804A CN 106348644 B CN106348644 B CN 106348644B
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parts
calcium
concrete
modified oxidized
nano
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CN106348644A (en
Inventor
陈威
黄煌
王恒
尹丹
阮长泰
谢体云
欧鹏
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GUILIN HUAYUE ENVIRONMENTAL PROTECTION CO Ltd
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GUILIN HUAYUE ENVIRONMENTAL PROTECTION CO Ltd
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B40/00Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/0028Aspects relating to the mixing step of the mortar preparation
    • C04B40/0039Premixtures of ingredients

Abstract

The invention discloses a kind of composite expansive agents for concrete, are made of each component of following weight:15~20 parts of ca aluminosilicate, 25~30 parts of calcium sulphoaluminate, solid 20~30 parts of sulphur waste residue, 10~20 parts of red mud, 10~15 parts of lithium slag, 4~8 parts of modified oxidized calcium, 3~6 parts of magnesia, 5~8 parts of sodium methyl silicate, 0.1~0.3 part of azodicarbonamide, 0.4~0.7 part of sodium tripolyphosphate, 2~4 parts of lauryl sodium sulfate, 0.3~0.6 part of ethylene-acrylic acid copolymer, 0.7~0.9 part of polycarboxylate water-reducer, 0.5~0.7 part of nano-calcium carbonate.The present invention has many advantages, such as high intensity, good compensation ability and regulation and control calcium oxide reaction, is a kind of rising concrete admixture.

Description

Composite expansive agents for concrete
Technical field
The present invention relates to a kind of composite expansive agents for concrete, belong to construction material technical field of concrete additives.
Background technology
Concrete is most popular construction material, with the development of science and technology, is also furtherd investigate constantly, property It can improve and develop.In recent years, the contraction of concrete has become the hot spot of research with problem of Cracking, this is because in cement setting The variation of hardening initial stage, moisture loss and temperature, humidity easily causes volume contraction, is shrinking the drawing for being restricted and generating When stress is more than the tensile strength of concrete itself, cement concrete easily cracks;Meanwhile the concrete after cracking, carrying Ability drastically reduces;Furthermore the infiltration of moisture can further deteriorate the durability of concrete, and steel bar corrosion, structure is caused to destroy, Reduce the performance of concrete.
From material angle, can be solved by mixing fiber, fine-ground fly-ash or slag powders and swelling agent in concrete The certainly contraction of concrete and problem of Cracking.But fiber mixing concrete is cumbersome, it is of high cost;Fine-ground fly-ash or slag Powder volume is big, and material requested is of high cost, and cannot be fully solved the shrinkage cracking of concrete.However, swelling agent is a kind of chemistry Additive, incorporation is added in concrete, when concrete coagulation hardens, is expanded and is blocked pore crack, improve coagulation Native internal structure, plays the role of compensation contraction and tension reinforcing steel bar generates prestressing force and is sufficient filling with cement gap.Therefore, swollen Swollen dose be solve concrete contraction and problem of Cracking a kind of effective means.
Currently, leading swelling agent to be used both at home and abroad has calcium sulphoaluminate type, calcium oxide type and oxidation magnesium types, principle is logical It crosses aluminium sulfate, calcium oxide, magnesia etc. and reacts generation dilatancy with the hydrated product of water or cement in cement hydration process Substance.China Patent Publication No.:CN104386938A discloses entitled " for the multi-functional of Overlong Concrete Structure jointless construction The patent of swelling agent ", the component and its weight part ratio of the swelling agent are respectively:44-67 parts of sulfoaluminate clinker;Anhydrite 15-25 parts;5-8 parts of magnesia;5-10 parts of calcium oxide;1-2.5 parts of tartaric acid;1.5-2.5 parts of dispersant;Sodium metasilicate 3.5-5.5 Part;2.5-7.5 parts of sodium carbonate.Although it can obtain certain intensity and compensation contractility, can't be satisfactory.Together When calcium oxide aquation it is rapid, most of expansion is happened at concrete and generates plastic stage before intensity, expansion unobvious. Therefore, continue to explore and be necessary with research cement expansive material.
Invention content
The intensity, compensation ability of middle cement expansive material and the too fast deficiency of calcium oxide hydration reaction for the above-mentioned prior art The technical issues of, the technical problem to be solved by the present invention is to propose it is a kind of can effectively improve swelling agent intensity and compensation energy Power, and the composite expansive agents for concrete of calcium oxide reaction can be regulated and controled.
A kind of composite expansive agents for concrete is made of each component of following weight:15~20 parts of ca aluminosilicate, sulphur 25~30 parts of calcium aluminate, solid 20~30 parts of sulphur waste residue, 10~20 parts of red mud, 10~15 parts of lithium slag, 4~8 parts of modified oxidized calcium, oxygen Change 3~6 parts of magnesium, 5~8 parts of sodium methyl silicate, 0.1~0.3 part of azodicarbonamide, 0.4~0.7 part of sodium tripolyphosphate, 12 2~4 parts of sodium alkyl sulfate, 0.3~0.6 part of ethylene-acrylic acid copolymer, 0.7~0.9 part of polycarboxylate water-reducer, nano-calcium carbonate 0.5~0.7 part of calcium.
Preferably,
A kind of composite expansive agents for concrete is made of each component of following weight:18 parts of ca aluminosilicate, sulphur aluminic acid 28 parts of calcium, solid 25 parts of sulphur waste residue, 15 parts of red mud, 12 parts of lithium slag, 6 parts of modified oxidized calcium, 5 parts of magnesia, 7 parts of sodium methyl silicate, 0.2 part of azodicarbonamide, 0.6 part of sodium tripolyphosphate, 3 parts of lauryl sodium sulfate, 0.4 part of ethylene-acrylic acid copolymer, 0.8 part of polycarboxylate water-reducer, 0.6 part of nano-calcium carbonate.
The modified oxidized calcium is made of each component of following weight:30~40 parts of calcium oxide, acrylic acid 4~6 parts of resin, 6~9 parts of polysiloxanes, 5~8 parts of carboxymethyl cellulose, 1~3 part of nano magnesia, absolute ethyl alcohol 100~ 120 parts.
The modified oxidized calcium is to follow the steps below processing:
1) first calcium oxide is scattered in ethyl alcohol, impregnates 30~40min and be placed in a water bath, and is heated to 80~90 ℃;
2) it sequentially adds acrylic resin and polysiloxanes stirs evenly, carboxymethyl is added after being then cooled to 30~40 DEG C Cellulose continues to stir evenly;
3) nano magnesia is added, it is on 20~30KHz ultrasonic machines after 25~30min of ultrasound to be placed in frequency, and concentration is dried It is dry, you can to obtain modified oxidized calcium.
Compared with prior art, the beneficial effects of the invention are as follows:
1, ca aluminosilicate and calcium sulphoaluminate are compounded in the present invention, enhances expansion effect, meanwhile, have also combined oxygen Change calcium and magnesia expansion sources, act synergistically, improves compensation ability.Furthermore Gu sulphur waste residue mainly contains SiO2、Al2O3、 Fe2O3、CaO、SO3, f-CaO, and contain a certain amount of anhydrous CaSO4With a small amount of MgO etc., hydration reaction generates in concrete A large amount of entringite and cause Behavior of Hardened Cement Paste to expand, further increase compensation ability.In addition, red mud has cementing hole rack-like knot The features such as the more, large specific surface area of structure, hole, and contain Al in its ingredient2O3、Fe2O3, CaO etc., contain SiO in lithium slag2、Al2O3 Deng, compensation ability and early strength, later strength can be improved, and then the performance of concrete is made to be improved, improve market value.
2, by modified oxidized calcium, so that calcium oxide surface is formed composite membrane, efficiently controlled hydration rate, slowed down swollen Swollen speed makes most of plastic stage for expanding and being happened at after concrete generation intensity, improves expansion.Meanwhile carboxylic first Base cellulose has water retention, and as aquation carries out slow release moisture, water source is provided for calcium oxide, promotes expansion hair It is raw.Furthermore it being compounded with nano magnesia, the expansion time can be extended, effective compensation concrete early-age shrinkage and later stage shrink, Effectively pre- cracking-proof generates.In addition, sodium tripolyphosphate plays deferred action, it is swollen that calcium oxide in solid sulphur waste residue and red mud can be slowed down Swollen effect makes the expansion effect of swelling agent more preferably.
3, sodium methyl silicate has good penetrant crystalline and micro-expansibility, can not only improve the intensity of concrete, also The compensation performance of swelling agent can be improved;Azodicarbonamide plays foaming effect, and tiny, uniform point can be formed in concrete Cloth and remain to after curing keep microbubble, can compensate for raw material components sedimentation shrink;Nano-calcium carbonate both can induce aquation Reaction and the microstructure for improving hydrated product, improve the compression strength and density of concrete, and concrete can be made to have certainly My repair function, extends the service life, moreover it is possible to which modified polycarboxylic acid water-reducing agent improves the work(of water-reducing agent at the defects of greatly reducing crackle Effect.
4, the present invention makes full use of solid sulphur waste residue, red mud and lithium slag, not only saves engineering cost, and excellent expansion Performance.
Specific implementation mode
The present invention provides a kind of composite expansive agents for concrete, to achieve the object of the present invention, technical solution and effect more Clear, clear, the present invention is described in more detail below.
A kind of composite expansive agents for concrete is made of each component of following weight:15~20 parts of ca aluminosilicate, sulphur 25~30 parts of calcium aluminate, solid 20~30 parts of sulphur waste residue, 10~20 parts of red mud, 10~15 parts of lithium slag, 4~8 parts of modified oxidized calcium, oxygen Change 3~6 parts of magnesium, 5~8 parts of sodium methyl silicate, 0.1~0.3 part of azodicarbonamide, 0.4~0.7 part of sodium tripolyphosphate, 12 2~4 parts of sodium alkyl sulfate, 0.3~0.6 part of ethylene-acrylic acid copolymer, 0.7~0.9 part of polycarboxylate water-reducer, nano-calcium carbonate 0.5~0.7 part of calcium;
The modified oxidized calcium is made of each component of following weight:30~40 parts of calcium oxide, acrylic acid 4~6 parts of resin, 6~9 parts of polysiloxanes, 5~8 parts of carboxymethyl cellulose, 1~3 part of nano magnesia, absolute ethyl alcohol 100~ 120 parts;
The modified oxidized calcium is to follow the steps below processing:
1) first calcium oxide is scattered in ethyl alcohol, impregnates 30~40min and be placed in a water bath, and is heated to 80~90 ℃;
2) it sequentially adds acrylic resin and polysiloxanes stirs evenly, carboxymethyl is added after being then cooled to 30~40 DEG C Cellulose continues to stir evenly;
3) nano magnesia is added, it is on 20~30KHz ultrasonic machines after 25~30min of ultrasound to be placed in frequency, and concentration is dried It is dry, you can to obtain modified oxidized calcium.
Embodiment 1
A kind of composite expansive agents for concrete is made of each component of following weight:18 parts of ca aluminosilicate, sulphur aluminic acid 28 parts of calcium, solid 25 parts of sulphur waste residue, 15 parts of red mud, 12 parts of lithium slag, 6 parts of modified oxidized calcium, 5 parts of magnesia, 7 parts of sodium methyl silicate, 0.2 part of azodicarbonamide, 0.6 part of sodium tripolyphosphate, 3 parts of lauryl sodium sulfate, 0.4 part of ethylene-acrylic acid copolymer, 0.8 part of polycarboxylate water-reducer, 0.6 part of nano-calcium carbonate.
Embodiment 2
A kind of composite expansive agents for concrete is made of each component of following weight:15 parts of ca aluminosilicate, sulphur aluminic acid 25 parts of calcium, solid 20 parts of sulphur waste residue, 10 parts of red mud, 10 parts of lithium slag, 4 parts of modified oxidized calcium, 3 parts of magnesia, 5 parts of sodium methyl silicate, 0.1 part of azodicarbonamide, 0.4 part of sodium tripolyphosphate, 2 parts of lauryl sodium sulfate, 0.3 part of ethylene-acrylic acid copolymer, 0.7 part of polycarboxylate water-reducer, 0.5 part of nano-calcium carbonate.
Embodiment 3
A kind of composite expansive agents for concrete is made of each component of following weight:20 parts of ca aluminosilicate, sulphur aluminic acid 30 parts of calcium, solid 30 parts of sulphur waste residue, 20 parts of red mud, 15 parts of lithium slag, 8 parts of modified oxidized calcium, 6 parts of magnesia, 8 parts of sodium methyl silicate, 0.3 part of azodicarbonamide, 0.7 part of sodium tripolyphosphate, 4 parts of lauryl sodium sulfate, 0.6 part of ethylene-acrylic acid copolymer, 0.9 part of polycarboxylate water-reducer, 0.7 part of nano-calcium carbonate.
(comparative example 1 and the difference of embodiment 1 are only that the calcium oxide in comparative example 1 does not pass through at modified to comparative example 1 Reason, but directly use, remaining is with embodiment 1).
Comparative example 2 (comparative example 2 and the difference of embodiment 1 be only that, in comparative example 2 without nano-calcium carbonate, remaining With embodiment 1).
Cement expansive material made from above-described embodiment 1-3, comparative example 1-2 and background technology (CN104386938A) is adopted It is tested with the prior art, test result is as follows shown in table 1:
1 cement expansive material test result of table
As can be seen that for the composite expansive agents for concrete of different parameters preparation is with respect to background technology, have volume low, swollen The advantages that swollen effect is good and intensity is high is a kind of rising concrete admixture.
Certainly, it is that the preferred embodiments of the disclosure is described in detail above, the present invention is not limited with this Practical range, equivalence changes made by all principles under this invention, construction and structure should all be covered by the protection of the present invention In range.

Claims (3)

1. a kind of composite expansive agents for concrete, it is characterised in that:It is made of each component of following weight:Ca aluminosilicate 15 ~20 parts, 25~30 parts of calcium sulphoaluminate, admittedly 20~30 parts of sulphur waste residue, 10~20 parts of red mud, 10~15 parts of lithium slag, modified oxidized calcium 4~8 parts, 3~6 parts of magnesia, 5~8 parts of sodium methyl silicate, 0.1~0.3 part of azodicarbonamide, sodium tripolyphosphate 0.4~ 0.7 part, 2~4 parts of lauryl sodium sulfate, 0.3~0.6 part of ethylene-acrylic acid copolymer, polycarboxylate water-reducer 0.7~0.9 Part, 0.5~0.7 part of nano-calcium carbonate, wherein modified oxidized calcium is made of each component of following weight:Calcium oxide 30 ~40 parts, 4~6 parts of acrylic resin, 6~9 parts of polysiloxanes, 5~8 parts of carboxymethyl cellulose, 1~3 part of nano magnesia, nothing 100~120 parts of water-ethanol.
2. composite expansive agents for concrete according to claim 1, it is characterised in that:By each component of following weight It is made:18 parts of ca aluminosilicate, 28 parts of calcium sulphoaluminate, solid 25 parts of sulphur waste residue, 15 parts of red mud, 12 parts of lithium slag, 6 parts of modified oxidized calcium, 5 parts of magnesia, 7 parts of sodium methyl silicate, 0.2 part of azodicarbonamide, 0.6 part of sodium tripolyphosphate, 3 parts of lauryl sodium sulfate, 0.4 part of ethylene-acrylic acid copolymer, 0.8 part of polycarboxylate water-reducer, 0.6 part of nano-calcium carbonate.
3. composite expansive agents for concrete according to claim 1, it is characterised in that:The modified oxidized calcium be according to Lower step is handled:
1)First calcium oxide is scattered in ethyl alcohol, 30~40min is impregnated and is placed in a water bath, and be heated to 80~90 DEG C;
2)It sequentially adds acrylic resin and polysiloxanes stirs evenly, carboxymethyl cellulose is added after being then cooled to 30~40 DEG C Element continues to stir evenly;
3)Nano magnesia is added, it is on 20~30KHz ultrasonic machines after 25~30min of ultrasound to be placed in frequency, and concentration is dried, It can be obtained modified oxidized calcium.
CN201610696804.9A 2016-08-19 2016-08-19 Composite expansive agents for concrete Active CN106348644B (en)

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CN108585572B (en) * 2018-02-05 2019-12-31 武汉优城科技有限公司 Polymer surface modified calcium sulphoaluminate expanding agent and preparation method thereof
CN108424022B (en) * 2018-05-10 2019-07-23 江西省建筑材料工业科学研究设计院 A kind of concrete lithium slag swelling agent
CN108911565A (en) * 2018-07-31 2018-11-30 江西省新宏泰建材有限公司 A kind of lithium slag class cement expansive material
CN109180060B (en) * 2018-09-13 2021-06-08 江西鑫盛实业有限公司 Enhanced concrete expanding agent and preparation method thereof
CN109665768A (en) * 2018-11-21 2019-04-23 阳江市恒基建材有限公司 A kind of concrete drain tile surface coating material and preparation method thereof
CN109384432A (en) * 2018-11-21 2019-02-26 阳江市恒基建材有限公司 A kind of automatic grouting technique of reinforced concrete sewer pipe
CN109851278B (en) * 2019-03-27 2021-07-13 常熟京常智能科技有限公司 Traffic detection equipment wall fixing expanding agent and preparation method thereof
CN110054456A (en) * 2019-04-26 2019-07-26 大连理工大学 A kind of cement base surface material with high-temperature damage self-repair function
CN110451847A (en) * 2019-07-04 2019-11-15 西安建祥建材科技有限公司 A kind of modified calcium sulphoaluminate-calcium oxide cement expansive material and preparation method thereof

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US7618490B2 (en) * 2003-08-20 2009-11-17 Denki Kagaku Kogyo Kabushiki Kaisha Spraying material and spray technique employing the same
CN101423355A (en) * 2008-11-21 2009-05-06 北京航空航天大学 Sulphoaluminates expansion agent prepared by industrial residue used in cement or concrete
CN104071997B (en) * 2014-07-15 2016-08-24 尹小林 Comprehensive utilization red mud, ardealite and the method for gangue
CN104446081B (en) * 2014-11-27 2017-01-18 厦门浩友建材有限公司 Concrete expansion agent and preparation method thereof

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