CN102863177B - Special coagulation-delaying high-efficiency slushing agent for dam roller compacted concrete - Google Patents
Special coagulation-delaying high-efficiency slushing agent for dam roller compacted concrete Download PDFInfo
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- CN102863177B CN102863177B CN201210398939.9A CN201210398939A CN102863177B CN 102863177 B CN102863177 B CN 102863177B CN 201210398939 A CN201210398939 A CN 201210398939A CN 102863177 B CN102863177 B CN 102863177B
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Abstract
The invention discloses a special coagulation-delaying high-efficiency slushing agent for dam roller compacted concrete. The slushing agent comprises, by weight, 46%-60% of naphthalene-based superplasticizer, 10%-35% of a common water reducing agent, 2.5%-15.0% of retarder, 10%-20% of an activating agent and 0.05%-0.3% of a thickening agent. The final product has the advantages of being coagulation-delaying, controllable, obvious in enhancing effect after hardening of concrete, low in mixed amount, good in water reducing effect, low in cost, capable of improving cohesiveness of the concrete and the like. The slushing agent is suitable for preparation of the dam roller compacted concrete, the mixed amount of mixed materials in the dam roller compacted concrete can be increased, and remarkable economic benefit and social benefit can be achieved.
Description
Technical field
The invention belongs to concrete additives in building materials field.Be specifically related to a kind of RCC Dam tailored version efficient retarding and water reducing agent, be specifically designed to preparation RCC Dam.
Background technology
The current peak period of China's Dam Construction just, and roller compacted concrete dam is to be known as a kind of dam type promising and the most with the fastest developing speed both at home and abroad, its dam construction technique is widelyd popularize at home and is applied.The roller compacted concrete that dam structure adopts is different from conventional normal concrete, has larger difference, thereby caused both to the difference in concrete admixture technical requirements in both work condition, mix-design and constructional method.
RCC Dam is mainly prepared by adding the method for efficient retarding and water reducing agent and air entrapment agent.On market, the efficient retarding and water reducing agent of existing many producers is applied to RCC Dam, also have many relevant application and research reports, but the target of its research mainly concentrates on two aspects: be improve the water-reducing effect of water reducer and corresponding roller compacted concrete is carried out to performance impact experimental study on the one hand simultaneously; Mainly to seek suitable retardant to come simple composite to solve the retarding effect of roller compacted concrete under high temperature on the other hand.
Because the efficient retarding and water reducing agent for RCC Dam on market is powder product substantially, therefore on market, existing powder product has often but been sacrificed the water-reducing effect of product when improving retarding effect, the mode that causes user can only increase by improving volume cost meets the performance requriements of roller compacted concrete, there is high cost in existing procucts simultaneously, and the enhancement method to roller compacted concrete is single, and while joining roller compacted concrete, be prone to the shortcomings such as concrete is discrete in preparation three gratings, level Four.
The present invention adopts low glue material on mix-design according to RCC Dam, high adulterant consumption (being generally more than or equal to 50%), low water usage amount, design feature and the corresponding performance technologies requirements such as maximum aggregate size large (160mm), multiple water reducer, retardant, promoting agent and thickening material have been chosen compound, wherein a kind of retardant has auxiliary plasticizing effect, according to composite modified theoretical realization, on water-reducing effect and retarding effect, all adopt polynary compound mode, develop a kind of RCC Dam tailored version efficient retarding and water reducing agent.
Summary of the invention
technical problem:the object of this invention is to provide a kind of tailored version efficient retarding and water reducing agent that can prepare RCC Dam.When thering is higher water-reducing effect, realizing retarding effect capable of dynamic in a big way controls and guarantees that water-reducing effect is substantially constant, well to meet the time of coagulation requirement of roller compacted concrete under dynamic temperature environment, large volume adulterant roller compacted concrete is had to good reinforced effects, can significantly improve roller compacted concrete cohesiveness to improve anti-discreteness, there is lower cost.
technical scheme:rCC Dam tailored version efficient retarding and water reducing agent of the present invention comprises the raw material of following weight per-cent:
Naphthalene series high-efficiency water-reducing agent 46% ~ 60%;
Ordinary water-reducing agent 10% ~ 35%;
Retardant 2.5% ~ 15.0%;
Activator 10% ~ 20%;
Thickening material 0.05% ~ 0.3%.
Described ordinary water-reducing agent is that one or more and the sugared calcium in calcium lignin sulphonate, sodium lignosulfonate, magnesium lignosulfonate is composited, and contains that to account for ordinary water-reducing agent weight percent be 20% ~ 80% sugared calcium.
Described retardant is that one or more and the Sunmorl N 60S in maltodextrin, sugar, citric acid, tripoly phosphate sodium STPP, trisodium phosphate is composited, and contains that to account for retardant weight percent be 50% ~ 95% Sunmorl N 60S.
Described activator is that anhydrous sodium sulphate and calcium chloride are composited.
Described thickening material is the mixture that the ratio of polyacrylamide and sodium cellulose glycolate is 1:1.
beneficial effect:the present invention has functional strong, and water-reducing effect is good, and water-reducing rate can reach 20% ~ 30%; Utilize and in retardant, there is the compound of the Sunmorl N 60S of auxiliary plasticizing effect and ordinary water-reducing agent, can make powder product guarantee under the prerequisite that water-reducing rate is substantially constant, can dynamically adjust the slow setting time on a large scale, realize the relative stability of product under dynamic temperature environment; Utilize dual activator to excite the activity of flyash fusion material, to guarantee the concrete reinforced effects of Fly-ash Content Rolling, realized large volume blending concrete and after sclerosis, there is good reinforced effects; Utilize composite thickening agent to improve concrete cohesiveness, improved the anti-discrete performance of roller compacted concrete; Production technique is convenient, and cost is low.Finally make that product has that slow setting is controlled, after concrete hardening reinforced effects significantly, can improve the features such as concrete cohesiveness, volume is low, water-reducing effect good, cost is low, be applicable to the preparation of RCC Dam, can promote the volume of adulterant in RCC Dam, there is significant economic benefit and social benefit.
Embodiment
Below in conjunction with embodiment and comparative example, process of the present invention and effect are described further.
embodiment 1.
A RCC Dam tailored version efficient retarding and water reducing agent, the weight percent of each moiety is: the mixture 0.15% that the ratio of naphthalenesulfonate formaldehyde condensation compound 57%, sodium lignosulfonate 15%, sugared calcium 10%, Sunmorl N 60S 5%, maltodextrin 0.85%, anhydrous sodium sulphate 6%, calcium chloride 6%, polyacrylamide and sodium cellulose glycolate is 1:1.This example is mainly used in the preparation of RCC Dam during spring, two seasons of autumn.
embodiment 2.
A RCC Dam tailored version efficient retarding and water reducing agent, the weight percent of each moiety is: the mixture 0.2% that the ratio of naphthalenesulfonate formaldehyde condensation compound 53%, calcium lignin sulphonate 5%, sugared calcium 20%, Sunmorl N 60S 9%, maltodextrin 0.8%, anhydrous sodium sulphate 6%, calcium chloride 6%, polyacrylamide and sodium cellulose glycolate is 1:1.This example is mainly used in the preparation of RCC Dam during summer.
embodiment 3.
A RCC Dam tailored version efficient retarding and water reducing agent, the weight percent of each moiety is: the mixture 0.1% that the ratio of naphthalenesulfonate formaldehyde condensation compound 60%, sodium lignosulfonate 20%, sugared calcium 5%, Sunmorl N 60S 2%, maltodextrin 0.9%, anhydrous sodium sulphate 6%, calcium chloride 6%, polyacrylamide and sodium cellulose glycolate is 1:1.This example is mainly used in the preparation of winter RCC Dam.
implementation result.
Test subject and method are carried out with reference to < < concrete admixture > > (GB 8076-2008), RCC Dam tailored version retardation water reducing agent volume is 0.7%, and concrete performance examination test-results is in Table 1.
table 1 RCC Dam efficient retarding and water reducing agent concrete performance examination test-results
Table 1 result shows, concrete performance examination test-results of the present invention meets the related request in standard < < concrete admixture > > (GB 8076-2008).
Although the present invention has enumerated part embodiment openly as above; but they are not for limiting the present invention; anyly be familiar with this skill person; without departing from the spirit and scope of the invention; from working as, can make various changes or retouch; for example certain part of feed composition or process time are done to increase or reduce, but the effect of product may not can be produced to substantial effect, within so this change belongs to the scope that the application's claim protection domain defines equally.
Claims (1)
1. a RCC Dam tailored version efficient retarding and water reducing agent, is characterized in that, this water reducer comprises the raw material of following weight per-cent:
Naphthalene series high-efficiency water-reducing agent 46% ~ 60%;
Ordinary water-reducing agent 10% ~ 35%;
Retardant 2.5% ~ 15.0%;
Activator 10% ~ 20%; Described activator is that anhydrous sodium sulphate and calcium chloride are composited;
Thickening material 0.05% ~ 0.3%; Described thickening material is the mixture that the ratio of polyacrylamide and sodium cellulose glycolate is 1:1;
Described ordinary water-reducing agent is that one or more and the sugared calcium in calcium lignin sulphonate, sodium lignosulfonate, magnesium lignosulfonate is composited, and contains that to account for ordinary water-reducing agent weight percent be 20% ~ 80% sugared calcium.
Described retardant is that one or more and the Sunmorl N 60S in maltodextrin, sugar, citric acid, tripoly phosphate sodium STPP, trisodium phosphate is composited, and contains that to account for retardant weight percent be 50% ~ 95% Sunmorl N 60S.
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| CN201210398939.9A CN102863177B (en) | 2012-10-19 | 2012-10-19 | Special coagulation-delaying high-efficiency slushing agent for dam roller compacted concrete |
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| CN201210398939.9A CN102863177B (en) | 2012-10-19 | 2012-10-19 | Special coagulation-delaying high-efficiency slushing agent for dam roller compacted concrete |
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| CN102863177B true CN102863177B (en) | 2014-04-09 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104446642B (en) * | 2014-12-03 | 2017-06-16 | 中国二十二冶集团有限公司 | Concrete smear type surface time delay retarder and its application process |
| CN105713142B (en) * | 2015-12-29 | 2018-06-26 | 江苏苏博特新材料股份有限公司 | A kind of retarding water reducer and preparation method thereof |
| CN105948552A (en) * | 2016-05-02 | 2016-09-21 | 唐岁寒 | Cementing material additive |
| CN106242346A (en) * | 2016-08-08 | 2016-12-21 | 安徽炎胜新材料科技有限公司 | A kind of low-dosage cement water reducing agent and preparation method thereof |
| CN110294605B (en) * | 2019-07-11 | 2020-05-12 | 江苏昆腾新材料科技有限公司 | High-efficiency water reducing agent for high-strength concrete |
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| CN100381386C (en) * | 2006-07-13 | 2008-04-16 | 内蒙古科技大学 | Efficient retarding and water reducing agent for concrete |
| CN101343157A (en) * | 2008-08-18 | 2009-01-14 | 蒋德双 | Diminishing excitant and preparation method |
| CN102101759B (en) * | 2010-12-30 | 2012-08-22 | 广东水电二局股份有限公司 | Concrete composite additive and preparation method and use thereof |
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