Poly (carboxylic acid water reducing agent powder

 

Poly (carboxylic acid water reducing agent powder

Poly (carboxylic acid water reducing agent powder's brief introduction:

Poly (carboxylic acid is of high performance water reducing agent at home and abroad in recent years a new generation of high performance water reducing agent.Compared with the tradition such as naphthalene series high efficient water reducing agent, poly (carboxylic acid is a high performance water reducing agent has many unique technical performance advantages: (1) the low dosage, high water reducing rate;(2) on the fluidity of concrete mixture stability;(3) good compatibility with cement;(4) preparation of concrete shrinkage rate is small, to improve concrete volume stability and durability;(5) in the process of the production and use environmental protection free from contamination, belongs to the green admixture.It is because of the above performance advantages, poly carboxylic acid high performance water reducing agent has been in domestic engineering caused extensive attention in recent years, many important engineering has extensive use of the new water reducing agent.Predictably, due to the many unique performance advantages, poly carboxylic acid is a high performance water reducing agent will rapidly become the mainstream of water reducing agent market products.

Because the poly carboxylic acid is a high performance water reducing agent is liquid state, more unsafe milling process is complex and production process.So on the market is more liquid to sales.Recently due to the improvement of technology, milling process is improved, the state of the powder poly carboxylic acid high performance water reducing agent has one of the more common.Powder, by contrast, the state of the product, from transport to customers to use, provide a lot of convenience, since then powder formed the development trend of such products.

 

   

 

Main performance:

1, apparent performance: the appearance of white powder

The density of	Solid content	PH	CL—	The total amount of alkali
510 + 10	98 + / - 1%	7-9	< 0.1%	< 5%

2, net pulp properties

Content (%)	5 minutes	1 hour	Fluidity loss (%)
0.12	140	160	0
0.14	160	180	0
0.16	180	200	0
0.18	200	240	0
0.20	240	270	0
0.22	270	310	0

 

Powder dosage (%)	Water reducing rate (%)
0.14	18
0.18	23
0.20	29
0.22	32

(1) at low dosage of cement has good dispersion and mobility;

2 content is more than 0.12% to 0.22%, the flowability net has very obvious growth.

1 hour (3) net slurry fluidity loss;

(4) the fluidity of water reducing agent than the sold more than 1 times higher than that of high efficiency water reducing agent.

3, mortar performance

(1) mortar flowability water reducing rate of results and the net result has a corresponding relation between each other, both net paste fluidity big, mortar water reducing rate is big;

2 water reducing rate with the increase of the content, the water reducing rate increase quickly, and high water reducing rate;In the same when the dosage of water reducing rate; about 35% higher than the commercially available high efficiency water reducing agent

(3) water reducing agent of concrete water reducing rate due to the effect of admixture and sand performance often do not agree with mortar water reducing rate.When the admixture and sand performance concrete fluidity, the concrete water reducing rate higher than that of mortar water reducing rate, lower than that of mortar conversely water reducing rate;

(4) with antifreeze performance when - 5 ℃ above, can be used as antifreeze used in concrete.

4, concrete performance

(1) of the concrete strength of concrete (kg/m3)

 

	water	cement	sand	stone
The benchmark	200	330	712	1163
Blending 0.16% powder water reducing agent	138	327	734	1198

The compressive strength growth ratio (benchmark) (%) as follows:

1 day	3 days	7 days	28 days	90 days
220	190	170	170	170

Other 2 concrete performance

Exudation rate than	Shrinkage rate than	Initial setting time	Final setting time	Air content
85% or less	75% or less	+ 40 ~ 80 minutes	+ 0 ~ 10 minutes	3% or less

 

Mixed powder concrete water reducing exudation rate and shrinkage rate, lower than the benchmark concrete initial setting time than the base extend about 60 points, final setting time and benchmark concrete basic same, general control air content in 2-4%.

Recommended dosage:

Used for concrete water reducing agent recommended dosage is: 0.1 to 0.25% of the dosage of cement.

Water reducing agent is based on poly (carboxylic acid salt as the main composition of powder, the solid content is 98%, normal dosage is 0.12% - 0.3%, when the content is only 0.06%, with 12% of the strength of the water reducing rate and the 23% growth, has more than ordinary pumping agent market effect.Content is 0.1%, the performance more than general naphthalene series and its amine the level of high efficiency water reducing agent.But content lower than 0.14%, the excellent performance of sex is not obvious.When the dosage of 0.20% or more, the working performance of concrete and pumping performance improvement to a very good level.Therefore, we suggest that the best dosage of 0.12-0.24%;Configuration is high grade, big dosage of fly ash/slag powder and have special requirements of concrete, concrete content can be amplified to more than 0.3%, but should not be commonly more than 0.5%, the experimental results show that content to 0.5% to enlarge, also do not produce cohesive and aggregate concrete slurry separation (segregation) phenomenon, water reducing rate is still rising, but the air content increase, the condensation delay, strength decreased.

 

   

Process characteristics:

To circulate on the market at present the carboxylic acid powder is commonly by spray drying process, but relatively products also has some defects, isolation agent products generally contain 5%, 3% of the water, after spray drying, effective component loss is bigger, the actual performance of products is relatively influenced by certain.

Bok chemical poly carboxylic acid powder on the production process break the routine, adopts thermal synthesis process for the first time on the energy consumption greatly reduced the production cost, not adding isolation agent, production of higher purity and solid content control in 98%.On the product performance, high purity products with less dosage, high effective components guarantee good performance characteristics of collapse, further reduce customer costs.

 

Method of use:

1, according to the concrete design requirements, after the experiment to adjust water or sand ratio, slump, strength, setting are meet the requirements of water reducing agent dosage.

2, suitable for high performance concrete, high strength concrete, large flow of concrete.For above C50 concrete should also choose good raw materials, in accordance with the relevant technical specification, determine the appropriate mixing process, and achieved a certain amount of experimental data.Make the production flow of concrete performance meet the construction requirements, the surplus coefficient of concrete strength should be.

3, this product can be with mixing water and mixed with concrete, mixing in water mixed with concrete effect is better.

 

Safety precautions:

1, this product is a weak alkaline solid, non-toxic, non-corrosive, for pollution-free products to the environment.But do not eat, when in contact with the human body and eyes, should wash as soon as possible, for part of the human body allergic phenomenon should be timely medical treatment.

2, this product should be stored in paperboard barrel lined with plastic sheets, to avoid the rain water and debris into.

3, the product shelf life is 12 months.

Packing: generally USES/paper-plastic packaging lined with plastic bag.

 

 

 

 

 

 

 

 

 

 

Main performance:

1, apparent performance: the appearance of white powder