Quality/strength-enhancing additive

Product Description

The OPTEVA® 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”. OPTEVA® CBA® additives offerall 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 either reduced cost of production or increased cement strengths.

Physical Properties

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

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

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

Primary Benefit

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

The use of OPTEVA® CBA® allows the cement producer to reduce fineness and achieve lower unit power costs without sacrificing strength. Compared with conventional grinding aids, OPTEVA® 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.


  • The chemical action of OPTEVA® 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.
  • OPTEVA® 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 OPTEVA® 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.


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 OPTEVA® CBA® product for each condition.


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

Addition Rate

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

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

Typical Performance Data OPTEVA® CBA® 1115

Objectives A) Replacement of 10% Clinker by Limestone (Laboratory Test)
Additive Blank OPTEVA® CBA®  1104 OPTEVA® CBA®  1104
Cement Composition:
Clinker 65% 60% 55%
Gypsum 5% 5% 5%
Limestone 30% 35% 40%
OPTEVA® CBA®  Dosage - 0.06% 0.06%
Mill Revolutions 2700 2700 2600
Mill Production (t/h) - - -
Power Input (kWh/t) - - -
Blaine (cm2/g) 4070 3950 3980
Residues 40 µm 24.5% 14.1% 14.7%
Flow (mm) 111 108 105
Compressive Strength (MPa):
1 Day 2.8 3.6 3.1
3 Day 8.7 10.8 9.7
7 Day 12.3 15.8 15.1
28 Day 18.4 23.5 21.8


Objectives B)  Increase Strengths at same Limestone Content (Plant Test)
Additive Blank OPTEVA® CBA®  1104 OPTEVA® CBA®  1104
Cement Composition:
Clinker 72% 71% 72%
Gypsum 4% 5% 5%
Limestone 24% 24% 23%
OPTEVA® CBA®  Dosage - 0.02% 0.04%
Mill Revolutions - - -
Mill Production (t/h) 37.3 36.0 37.6
Power Input (kWh/t) 28.1 28.8 28.1
Blaine (cm2/g) 4380 4410 4160
Residues 40 µm 27.0% 17.5% 12.8%
Flow (mm) 114 113 112
Compressive Strength (MPa):
1 Day 5.6 8.4 10.5
3 Day 13.4 18.8 19.2
7 Day 18.1 23.5 24.0
28 Day 22.6 27.4 29.3

Typical Performance Data CBA 1115

Objectives Compare the efficiency of OPTEVA® CBA®  against competitive product (Plant Test)  
Additive Product xyz OPTEVA® CBA®  1115 Product xyz OPTEVA® CBA® 1115
Cement Composition:  
Clinker 86% 86% 86% 86%
Gypsum 5% 5% 5% 5%
Limestone 9% 9% 9% 9%
Additive Dosage 0.20% 0.04% 0.18% 0.04%
Cement Mill # 3 3 4 4
Mill Production (t/h) 13.1 17.2 21.2 28.8
Power Input (kWh/t) 62.8 47.7 38.7 28.5
Blaine (cm2/g) 4200 3950 3530 3160
Residues 40 µm 7.0 3.4 15.3 12.0
Compressive Strength (MPa):
1 Day 18.3 18.1 12.5 11.5
3 Day 31.2 33.1 26.9 28.2
7 Day 38.8 44.6 34.1 38.2
28 Day 49.1 57.4 45.8 51.7
W/C 0.60 0.56 0.62 0.59
Slump (cm) 16 16 17 17
Compressive Strength (MPa):        
1 Day 9.9 10.2 8.4 8.2
3 Day - - - -
7 Day 26.2 29.4 22.0 25.7
28 Day 32.9 39.1 29.0 32.3


OPTEVA® 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.

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, semiautomatic, automatic and computerised systems.


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


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

Technical Services

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

th.gcpat.com | Thailand customer service: 66 2 030 9700

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.

OPTEVA 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.  

© Copyright 2017 GCP Applied Technologies, Inc. All rights reserved.

GCP Applied Technologies Inc., 2325 Lakeview Parkway, Alpharetta, GA 30009, USA
GCP Applied Technologies Holdings (Thailand) Limited., 848 Moo 2, Bangpoo Industrial Estate (North), Phraksa Mai, Muang Samutprakarn, Samutprakarn 10280, Thailand
This document is only current as of the last updated date stated below and is valid only for use in Thailand. 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.th.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: 2023-07-07