King® HLM-350
Natural hydraulic lime-based masonry mortar for repointing applications
King® HLM-350 is a premixed, factory-bagged mortar specially designed to be used when repointing masonry elements. This mortar is formulated with natural hydraulic lime, masonry sand with controlled grain size and an air-entraining admixture.
- Factory-calibrated mix
- Formulated without cement
- Formula similar to historic mortars
- Excellent water vapour transmission properties
- Better resistance to freeze-thaw cycles than hydrated lime
- Better resistance to de-icing salts than hydrated lime
Usage
- Repointing buildings or monuments (ancient or modern)
- Can be used for interior and exterior applications
Advantages
- Factory-calibrated mix
- Formulated without cement
- Formula similar to historic mortars
- Excellent water vapour transmission properties
- Better resistance to freeze-thaw cycles than hydrated lime
- Better resistance to de-icing salts than hydrated lime
Packaging
30 kg (66 lb) triple-lined bags, polywrapped on wooden pallets.
Colour
Powder / Cream
Note: May be factory-coloured or at the job site using the King® Colour-Plus Pigment System exclusive to Sika Canada. All pigments used conform to the requirements of ASTM C979 Pigments for Integrally Colored Concrete.
Product Details
Shelf Life
12 months in original, unopened bag
Storage Conditions
Always store in a dry area, protected from the weather. At the job site, an additional tarpaulin must be used to cover the product to prevent water infiltration.
Compressive Strength
| ASTM C109 - Minimum * |
| 7 days | 28 days | 90 days |
| 0.7 MPa (101 psi) | 1.8 MPa (261 psi) | 2.7 MPa (391 psi) |
* The compressive strengths of natural hydraulic lime mortars gradually increase as a function of time unlike mortars containing cement which reach their optimal value around 28 days.
Note: The pigments used to colour the mortar have no effect on its mechanical properties.
Shrinkage
| ASTM C596 / Shrinkage |
0.05 % at 91 days
Porosity
| EN-1015-7 Method / Air Content |
| 14 % Maximum |
Application
Product Temperature
Refer to the "Placement condition" section on the Specifications template document on Sika Canada Website.
Ambient Air Temperature
Refer to the "Placement condition" section on the Specifications template document on Sika Canada Website.
Substrate Temperature
Refer to the "Placement condition" section on the Specifications template document on Sika Canada Website.
Consistency
| ASTM C780 / Vicat Cone |
| 15 mm ± 5 mm (0.6 in ± 0.2 in) |
Yield
Approx. 0.018 m3 (0.65 ft3) of fresh mortar per 30 kg (66 lb) bag
SURFACE PREPARATION
Prepare the surface to be repaired in order to remove loose particles and faulty mortar on a thickness corresponding at least to twice the thickness of the joint to be repaired or up to obtaining a healthy mortar. Moisten the area to be repaired without leaving standing water in the cavities to be filled.
MIXING
Small batch
Important: In order to avoid segregation issues, always mix the total content of one bag. If less than a 30 kg (66 lb) bag of King® HLM-350 is required, dry mix - without water - the total content of the bag in a clean container, take the required amount, and then add water to the amount withdrawn from the mixture.
Large batch
Always mix the entire content of the bag. Mix the King® HLM-350 with a maximum of 4.2 L (1.1 US gal) of water per 30 kg (66 lb) bag, in a clean mortar mixer. Pour 3.8 L (1 US gal) of water into the mixer and add 30 kg (66 lb) of King® HLM-350. Mix for five (5) minutes, or five (5) to ten (10) minutes when using a coloured mortar or when a colourant is added at the job site. Allow the mortar to stand for a short period of time. Using the remaining water, adjust the mortar to obtain the desired consistency. Once well mixed, the consistency of the mortar should be firm enough to allow you to shape a ball with your hands.
APPLICATION
The application of the mortar must comply with the requirements of Section 6 of CSA-A371-14.
CURING TREATMENT
Curing is essential for optimizing the physical properties of the mortar. Curing is carried out by performing a moist cure which must begin as soon as the initial setting of the mortar begins and for a period of three (3) to seven (7) days. To learn more about the moist cure, refer to the guide: How to perform a moist cure for masonry, published by Sika Canada and available on the company’s website.
CLEAN UP
In order to avoid the use of chemicals, it is always recommended to remove as much mortar splashes or stains as possible before the material hardens. Use water, a piece of burlap or wood. If the use of cleaning products is necessary, be sure to contact the manufacturer of the product to validate the compatibility and the procedure to follow. It is important to mention to the manufacturer that it is a hydraulic lime-based mortar with the addition of iron and titanium oxides pigments when coloured.
Regardless of the technique or product selected, it is essential to preserve the integrity of the mortar.
Be sure to clean a test area before proceeding with the work.
Clean all tools and equipment after use with water. Once hardened, the product can only be removed mechanically.
