Very Fine Particle Grouts

Purpose:
Suitable for filling fine fractures in unit masonry, to prevent uncontrolled water ingress through fine cracks in otherwise suitable materials and ideal for early concretes where strengths are more commonly less than 25N/mm2. Ideal for roman cement render re-attachment to backgrounds or within layers.
Suitable for repairs to detachment and or cracked moulded decorative renders and masonry or cast concrete.
Grout around exposed re-bar and the like and for anchors, ties and other structural consideration.
Delivered by gravity or pressure. Rapid freeze thaw capability.
Compatible with virtually all unit masonry units and pre- 1930’s concrete:

General Commentary:
Cracks are never uniform, and the width of the crack or separation plane between materials may vary, either as a result of the shape of the fractured interfaces or from particle accumulation within the void. The void may also have become contaminated with debris carried into the gap under the action of on going movement e.g.
Thermal expansion and contraction, particularly in wet or damp conditions,
Flexing of walls such as wind loads, both positive and negative,
Vibration e.g. church bells, traffic vibration,
Settlement, from ground heave, foundation settlement etc.
Water carrying dust or fragments into open spaces and voids
Jacking between interfaces can occur as a result of ice or salt crystallization

Free flowing gravity grout through a Syringe inserted into the target point or through multiple points, with minimal pressure, to avoid physical stress to already separated layers of materials is the most common method to secure plasters and renders that may have historical importance. In some instances, grouting to secure rather than repair may be the valid option say on a through coloured finish that would be difficult if not impossible to match in over a large area and will in its self be a financially viable alternative to repair or complete replacement.

Within a unitary masonry element such as a piece of fractured natural stone, the grout is normally applied under pressure (1Bar and higher) such that the grout fully penetrates the entire depth and volume of the crack. These types of grouts require the particle sizes generally less than 3 microns, often described as Nano Grouts.

They are actually very finely dispersed lime particles with additions to make them perform in specific ways. A micron is 1/1,000 of a millimeter and a Nanometer is 1/1,000 of a Micron so in practice ultra fine particle grouts are mostly in the range of what would be at best classed as coarse particles in the grouping of nanoparticles – but they do not really meet the criteria of measurement to be called true Nano particles. None-the-less our super fine grouts are on average less than 3 microns or 3/1,000 of a millimeter.

Historic Range

Product Name MMHSKA
Product Description:
A high solids ultra fine pure 99% Calcium Hydroxide paste with rheology modifiers, where 90% of the particles are less than 3 microns with a bulk density of 1.47 KGs per litre. Capable of forming bonds with compatible materials, high relative flexural strength relative to low compressive strength, very rapid Carbonation rate.

Purpose:
Capable of infiltrating very fine cracks less than 0.1mm – e.g. where plaster may have become detached from a background or between layers – or very fine fractures in unit masonry and the like, where the historic importance of the grout requires the introduction of material that will not result in any negative reactions – Lime has been the principle binder for historic buildings for the majority of recorded history.

Contemporary Range

Product Name MMNCSB

Product Description:
A high bond strength ultra fine pure Natural Cement with filler flower and additions that upon mixing in high shear mixers with specific water content, provide a range of flow properties for a range of situations. Control of flow, and a rapid gel capability, provide fast efficient crack consolidation with high bond strength and early weather resistance, suitable for above and below water applications.