Cement stabilisation is an effective method that increases the load-bearing capacity of New Zealand’s roads, and reduces it’s sensitivity to water. The process is paramount to construction within our country.
More details on cement stabilisation specifications can be found on the NZTA website.
In-situ cement stabilisation is common for pavement rehabilitation and can be used for new pavements using imported granular materials. However, additional coarse aggregate and cement may be needed to allow for breakdown of aggregates.
Laboratory testing of the hoed material is recommended to ensure that the cement stabilised material achieves the required strength.
Plant mix is produced either by continuous feed mixing or in a pugmill at static mixing plants. Electronic weighing systems and automated batching improve control over the mix proportions of aggregates, binders, water and additives.
Plant mix provides tighter control of batch quantities than in-situ mixing, meaning it’s more suitable for new modified base course layers.
Plant mix needs to be placed within two hours of manufacture.
In-situ concrete stabilisation: mixing cement and water in place.
Historically, New Zealand engineers have been constrained to use cheaper construction materials and veer away from concrete.
But in recent years, our road network has developed significantly - with an increase in traffic and pavement costs have grown considerably. New Zealand roads have needed to change direction and turn to another solution.
The Transfund New Zealand Pavement Evaluation Manual is the approved framework for economic calculation of the merits of road works. The list of areas associated with the calculation which affect measures of concrete pavements and the competing flexible pavement options include: