TECHNICAL DATA Revision Date 12/2000
Davment QSM is a pre-mixed Portland cement based mortar designed to give rapid high strength properties for the support of highway furniture. The mixed mortar, when placed, will harden in approximately 10 minutes. The compressive strength gain will reach 22 N/mm2 in 1 hour allowing road opening to vehicular traffic within 3/4 to 1 hour.
The self contained product only needs to be mixed with water on site providing rapid setting and strength gain enabling prompt setting of manhole frames and the re bedding of new frame systems. The product is chloride free and can be safely used with cast and steel units. The application speed provides early opportunity for completion of the works, surface topping and opening of roads to vehicular traffic. The mortar can be placed in sections of 15mm to 50mm in thickness and greater thicknesses can be built up in layers. After placement no special curing is required in moderate conditions.
Davment QSM is a British Board of Agrement Assured Data Sheet Product.
Re-bedding of raised manhole frames.
Support of road furniture.
Bedding of frames in new roads.
Setting sewer rings and gully grates.
Typical Mortar Properties @ 20°C
Water addition: 2.5 Litres per 25 kg bag Davment QSM.
|1 Hour||4 Hours||1 Day||7 Days||28 Day|
|22 N/mm2||33 N/mm2||43 N/mm2||48 N/mm2||51 N/mm2|
Variations in water content for particular applications may alter mortar consistency and compressive strength achieved.
Density: 2200 kg/m3.
Coefficient of Thermal Expansion: 11 x 10-6/°C
Bedding and levelling shall be carried out using Davment QSM as manufactured by Tecroc Products Ltd. The product must be stored, handled and placed strictly in accordance with the manufacturer’s instructions.
Tecroc Products Ltd is a firm of Assessed Capability. The Company’s quality system conforms to BS EN ISO 9002; 1994 and is assessed by SGS Yarsley International Certification Services Ltd.
Davment QSM has been tested in accordance with appropriate parts of the following standard : B. S. 18 81.
Instructions For Use
Laitance and all loose material including dust, oil and grease should be removed in order to produce a sound substrate. The work area should be pre-wetted taking care to remove any standing water before placing the Davment QSM mortar.
To achieve the most consistent mortar mix, mechanical mixing is recommended. Hand mixing is suitable but care should be taken to ensure that the mix is fully wetted out without the use of excess water. Mechanical mixing may be carried out in a suitable vessel using a slow speed high torque drill and Mortar Stirrer. Hand mixing may be carried out using a clean spot board or wheelbarrow.
Each 25kg bag of Davment QSM requires 2.5to 3 litres of water to give a mortar consistency. Excess water should not be added. Once setting of the mortar has commenced, further mixing should not be used to rework the mix.
The mortar should be placed within approximately 10 minutes of mixing. The working time may be extended in cold ambient conditions and may be slightly shortened in hot ambient conditions. A retarded grade is available.
Set suitable levelling shims onto the working surface ready to receive the frame or unit. Place the mixed mortar onto the prepared surface and lower the frame or unit onto the mortar and knock down onto the pre-set shims to line and level. The bed thickness applied in a single application should be between 15mm to 50mm. Thicker support beds can be achieved by applying further material as soon as the lower bed has hardened sufficiently not to distort under the additional work. The placed mortar will have hardened sufficiently to carry out further work, such as haunching, within some 45 minutes depending on the surrounding ambient conditions.
No special curing is required at temperatures between 5°C and 35°C. For placing temperatures outside this range contact the Technical Service Department.
Precautions: Health and Safety
Davment QSM is alkaline when mixed with water and should not come into contact with skin or eyes. Avoid inhalation of dust during mixing and wear safety glasses, dust mask and gloves. If skin contact occurs wash thoroughly with clean water. Should eye contact occur rinse immediately with plenty of clean water and seek medical advice.
Full health and safety details are given in Product Safety Data Sheet.
Fire: Davment QSM is non-flammable
Each 25kg bag of Davment QSM will enable a manhole frame 600mm x 600mm to be raised approximately 25mm.The volume yield of each 25kg bag of Davment QSM is approximately 123/4 litres.
Storage And Shelf Life
Davment QSM will have a shelf life of 6 months when kept in dry conditions at a temperature of 5°C to 45°C. Storage at higher temperatures and high humidity may reduce the shelf life.
Packaging: Davment QSM is supplied in
25kg valvesack bags Product Code DH20