CBA® Cement Additive

Quality/strength-enhancing additive

Product Description

The CBA® series of additives is a new concept in grinding aids – significantly different from any previous GCP product for the cement industry. The difference is that it is a “Grinding Aid Plus”. CBA® additives offer all of the benefits of traditional grinding aids, such as increased grinding efficiency and cement flowability. In addition, they offer a unique ability to improve cement strengths which might otherwise be deficient due to mechanical, physical or chemical shortcomings. Advantages include reduced cost of production and increased cement strengths.

Product specifications for the most widely used CBA® formulations are as follows:

  S.G. PH
CBA® 1102 1.06 (±0.01) 7 - 9
CBA® 1104 1.07 (±0.01) 8 - 12
CBA® 1115 1.10 (±0.01) 6 - 8

Specifications for other CBA® formulations not shown above are available through GCP Products Field Engineers.

Primary Benefit

The CBA® series of additives consists of tailor-made formulations to optimize performance and meet specific requirements at each plant.

The use of CBA® allows the cement producer to reduce fineness and achieve lower unit power costs without sacrificing strength. Compared with conventional grinding aids, CBA® offers unit power savings of up to 25% with no loss of strength. And the resulting production increases can greatly benefit plants operating at or near their grinding capacity.

Product Advantages

The chemical action of CBA® additives decreases the interparticle attraction between cement grains and increases the rate of hydration of cements. The key advantages of CBA® additives include:

  • Increased grinding efficiency with resulting increased mill output, higher cement fineness and/or reduced unit power input and grinding costs.
  • Increased workability (flow) of cement mortars and concretes.
  • Increased cement flowability and reduced pack set or “silo set” of cements resulting in lower handling costs and reduced waste.
  • Increased early and long-term compressive strengths for production of better quality cements.
  • Reduced cost of cement production through reduced unit grinding costs and through replacement of clinker with reactive additions such as pozzolans, blast furnace slag and fly ash or with fillers such as limestone.

CBA® additives are most effective in enhancing compressive strengths of blended cements using up to 40% limestone filler.

When cement particle size is not reduced, the addition of CBA® improves both early and long-term strength and produces higher quality cement.

Strength increases ranging from 5% to 50% have been demonstrated during plant trials.

Applications of CBA®

Laboratory mill evaluations of clinker and other additions are recommended to determine initial blend proportions, grinding efficiency, pack set index, mortar flow, compressive strengths of cements etc. and to enable GCP to formulate the most effective CBA® product for each condition.

Handling

CBA® additives are sprayed into the mill’s first compartment or added onto the clinker conveyor belt. Suitable dispensing pumps with adjustable flow rates should be used for accurate dosing and for optimum performance.

Addition Rates

CBA® addition rates of 0.02% to 0.06% by mass of cement are recommended.

The optimum addition rate of CBA® should be determined in laboratory and cement mill tests.

Dosing Equipment

GCP grinding aids should be accurately proportioned through a calibrated dosing system, suitable for the cement mill and output required.

GCP can advise on all types of equipment suitable for installation, including manual, semi-automatic, automatic and computerized systems.

Compatibility

CBA® additives, and cements treated with CBA®, are compatible in concrete with all commercial admixtures such as air entrainers, water reducers, retarders and superplasticizers. The performance of concrete admixtures and the physical properties of concretes are not adversely affected by the use of CBA® in cement production.

Packaging

CBA® is supplied in 210 L (55 gal) drums. CBA® may also be supplied in bulk in certain locations. It contains no flammable materials.

Storage

Protect from freezing. Once frozen, the product should be thawed out slowly and re-mixed thoroughly prior to use. Shelf life is a minimum of 12 months in manufacturer’s containers.

Technical Services

Field Engineers from GCP are available to assist in laboratory and mill test evaluations of CBA®. Complete testing equipment and methods for analyzing mill performance are also available during plant trials.

Typical Performance Data CBA® 1104

Objectives A) Replacement of 10% Clinker by Limestone (Laboratory Test) B) Increase Strengths at same Limestone Content (Plant Test)  
Additive Blank CBA® 1104 CBA® 1104 Blank CBA® 1104 CBA® 1104  
Cement Composition:            
Clinker
Gypsum
Limestone
CBA® Dosage
65%
5%
30%
60%
5%
35%
0.06%
55%
5%
40%
0.06%
72%
4%
24%
71%
5%
24%
0.02%
72%
5%
23%
0.04%
 
Mill Revolutions
Mill Production (t/h)
Power Input (kWh/t)
Blaine (cm2/g)
Residues 40 μm
2700


4070
24.5%
2700


3950
14.1%
2600


3980
14.7%

37.3
28.1
4380
27.0%

36.0
28.8
4410
17.5%

37.6
28.1
4160
12.8%
 
Flow (mm) 111 108 105 114 113 112  
Compressive Strength: (MPa)            
1 Day
3 Days
7 Days
28 Days
2.8
8.7
12.3
18.4
3.6
10.8
15.8
23.5
3.1
9.7
15.1
21.8
5.6
13.4
18.1
22.6
8.4
18.8
23.5
27.4
10.5
19.2
24.0
29.3
 

Typical Performance Data CBA® 1115

Objective: Compare the efficiency of CBA® against competitive product (Plant Test)

Additive: Product xyz CBA® 1115 Product xyz CBA® 1115
Cement Composition        
Clinker
Gypsum
Limestone
Additive Dosage
86%
5%
9%
0.20%
86%
5%
9%
0.04%
86%
5%
9%
0.18%
86%
5%
9%
0.04%
Cement Mill #
Mill Production (t/h)
Power Input (kWh/t)
Blaine (cm2/g)
Residues 40 µm
3
13.1
62.8
4200
7.0
3
17.2
47.7
3950
3.4
4
21.2
38.7
3530
15.3
4
28.5
28.5
3160
12.0
Motar Compressive Strength (MPa):      
1 Day
3 Days
7 Days
28 Days
18.3
31.2
38.8
49.1
18.1
33.1
44.6
57.4
12.5
26.9
34.1
45.8
11.5
28.2
38.2
51.7
Concrete Compressive Strength (MPa):      
W/C
Slump (cm)
1 Day
3 Days
7 Days
28 Days
0.60
16
9.9
--
26.2
32.9
0.56
16
10.2
--
29.4
39.1
0.62
17
8.4
--
22.0
29.0
0.59
17
8.2
--
25.7
32.3

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We hope the information here will be helpful. It is based on data and knowledge considered to be true and accurate, and is offered for consideration, investigation and verification by the user, but we do not warrant the results to be obtained. Please read all statements, recommendations and suggestions in conjunction with our conditions of sale, which apply to all goods supplied by us. No statement, recommendation or suggestion is intended for any use that would infringe any patent, copyright or other third-party right.

CBA is a trademark, which may be registered in the United States and/or other countries, of GCP Applied Technologies, Inc. This trademark list has been compiled using available published information as of the publication date and may not accurately reflect current trademark ownership or status.

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GCP Applied Technologies Inc., 62 Whittemore Avenue, Cambridge, MA 02140, USA

This document is only current as of the last updated date stated below and is valid only for use in the United States. It is important that you always refer to the currently available information at the URL below to provide the most current product information at the time of use. Additional literature such as Contractor Manuals, Technical Bulletins, Detail Drawings and detailing recommendations and other relevant documents are also available on www.gcpat.com. Information found on other websites must not be relied upon, as they may not be up-to-date or applicable to the conditions in your location and we do not accept any responsibility for their content. If there are any conflicts or if you need more information, please contact GCP Customer Service.

Last Updated: 2018-11-29

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