Concrete Properties | Compatibility | Pavement Properties | Workability | Working Instructions

COMPATIBILITY
Roadblend is manufactured for stabilisation application. Blending with other cement or cement extenders is not recommended.
Roadblend is compatible with admixtures complying with AS 1478.

PAVEMENT PROPERTIES
Pre-Specification. Where soils are suspected to contain sulfates of natural or industrial origin or where contact is expected with chemical solutions, analytical surveys are highly recommended and the appropriate cement selected and specified.

Sulfate Resistance. As with general purpose Portland cements, (Type GP) Roadblend's resistance to acid solutions including sulfuric acid below pH 6.5 is limited.
However, the life expectancy of the pavement will be maximised if a higher content of Roadblend is used and the pavement is fully compacted. It should be noted that higher cement contents may produce a cement bound material. The moisture content of the pavement should be closely monitored to ensure minimal variation from optimum. To maximise the performance, the stabilised material should be protected from frequent wetting through appropriate construction practices.

WORKABILITY
Roadblend will generally exhibit a longer working - time window than Type GP cement.
Under similar conditions, working - time to place, compact and trim pavements can extend to 4 hours (max) in comparison to 2 hours (max) for pavements containing Type GP cements.

Roadblend is therefore suitable for applications such as deep lift stabilisation projects, where it is desirable to extend the length of pavement produced or where longer working times are required.

Compressive strength development. The following graph gives indicative data on the performance of Roadblend.

Age at test
Water/cement ratio = 0.59

Additive Rate. Roadblend is suitable for use with most granular and many plastic materials and can be used to replace Type GP or blended cements commonly used in stabilisation application. However, the additive rate should be determined through a laboratory testing program. Most government authorities specify maximum plasticity index values for base and sub-base materials. The type of materials to be stabilised and the target unconfined compressive strength will determine the additive rate.

Roadblend may be used to modify materials with addition rates likely to fall in the range of 2% to 5% by weight of suitable untreated material (depending on the plasticity of the material). For cement bound materials cement contents can be expected to fall in the range of 4% to 6% by weight of untreated material.

The following table gives some guidance:

Mixing. Common practice is to specify cement contents in 0.5% increments. Most specifications require full compaction to be achieved within 60 - 90 minutes of the addition of the cement and water to the untreated material. As noted previously, when Roadblend is used this time frame may be increased. It is recommended that trials be carried out to determine the maximum time required to compact each treated material.

Water should be clean and free from deleterious material. Water containing dissolved salts and organic matter may adversely affect the strength and durability of the pavement.

Placing. Roadblend may be used in both the in-situ method and the pugmill method. The mixing of the pavement materials should be carried out using purpose built stabilising equipment.

Curing. To ensure full strength development, it is essential that curing the cement stabilised layer is carried out for a period of at least seven days. Curing methods such as regular, uniform spraying with a water cart and the application of a bituminous prime coat membrane are common.

WORKING INSTRUCTIONS
Storage. Contact with air and moisture will cause hydration of the cement to occur and will alter the cement properties. The "shelf life" of Roadblend cement is therefore dependent on the storage conditions. It is recommended that Roadblend be retested prior to use if the age of the cement exceeds three months.

SUPPLY AND PRICE
Supply. Roadblend is available in bulk only. All enquires regarding supply and price should be directed to the address shown below.
sales@sunstatecement.com.au

Handling. A Material Safety Data Sheet can be obtained here.

Concrete Properties | Compatibility | Pavement Properties | Workability | Working Instructions
 

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