Hychem Terrazzacrete — Customisable polished concrete overlay, UV stable and hard-wearing

The existing substrate is to be mechanically prepared through

diamond grinding or shotblasting the surface to a minimum CSP3.

The substrate must be firm, clean and dry with a minimum

compressive strength of 25 MPa and a minimum surface tensile

strength of 1.5 MPa.

Static cracks below 2mm should be cleaned and filled with Hychem

GPT. Live cracks or substrates with high potential movement

should be discussed with Hychem prior to application.

The Terrazzacrete standard specification detail includes aluminum

edge strips around perimeters (can be covered with skirting if

desired) and at entranceways. Aluminum angles may be suitable

for expansion joints and control joints, the joint detail should be

discussed with Hychem on a project specific basis.

Prime Coat

Apply Hychem GP at 5-7sqm/L and broadcast a dry 1mm sand

aggregate to full coverage (no coating to be visible). Coverage

rates may vary due to porosity changes in the concrete. For

projects with short application windows Hychem have suitable rapid

curing primers.

Overlayment application

Mix the selected Terrazzacrete binder (SL503,505,244) in a

suitable mixing station. Begin by pouring the water into the mixing

station and mixing with the pigment until thoroughly dispersed. The

selected Velosit cement binder is then added and mixed thoroughly

before adding the aggregate and continuing to mix for 2 minutes.

Terrazzacrete is then poured to the nominated thickness with the

applicator using suitable tools and techniques to accurately and

consistently spread the material.

Mix ratios

PRODUCT DESCRIPTION ADDITIONAL

AGGREGATE

20kg

SC244

50MPa “self

smoothing”

binder with in

built aggregates

Maximum

20kg

Natural

grey or

white with

the option

to add up to

10%

pigment

20kg

SL503

50MPa self-levelling binder

Maximum

20kg

Natural

grey with

option to

add up to

10%

pigment

20kg

SL505

60MPa self-levelling binder

Maximum

20kg

Natural

white with

option to

add up to

10%

pigment

HYCHEM SPECIFICATION

Terrazzacrete Typical Portland

cement product

Foot traffic 2-4 hours 4-24 hours

Grinding and

polishing

1-2 days 7 days

Sealing 1-2 days 7 days

OPTIONAL ADDITIONS

Screed or bulk fill levelling layer (if required)

When height tolerances need to be raised above 25mm Hychem

have an economical SC240 bulk fill screed. For application of the

screed, ensure the substrate is prepped to a minimum CSP2.

Squeegee or rolldown GP epoxy primer at 7sqm/L with a full

broadcast of 1mm dried sand. Once cured apply SC240 with

Hychem screed sand to the nominated thicknesses (5mm-100mm).

Once cured the Terrazcrete can then be applied directly onto the

screed following standard specification procedure.

Waterproofing membrane (if required)

Hychem WP101 negative pressure cementitious waterproofing can

be used for waterproofing if required. Hychem must be consulted to

discuss suitability on a project specific basis.

Sound insulation (if required)

Hychem Soundstop sound insulation can be combined with

Hychem SC240 as a de-bonded screed prior to application of

Terrazzacrete. Hychem should be consulted to confirm specification

detail.

Subfloor heating (if required)

Hychem Terrazzacrete can be applied over subfloor heating in most

cases, Hychem should be consulted to confirm specification detail.