Stabilised Soils on building Sites
Stabilising land with the using the propriety stabilisation binder Smr as rescue agent and binder is an very cost effective recipe of converting difficult or contaminated soils into purpose engineered building materials.
Virtually any soils along with most contaminated soils found on site can be recovered and improved using Smr.
By using the existing on site won soils or materials, building can in most cases be commenced far quicker and with reduced planning and environmental constraint and delays.
Inaddition, the use of site won materials will lead to vital savings in lorry movements and big reductions in the environmental damage and broad carbon footprint of the project.
Recycling in-situ additional reduces environmental impacts otherwise associated with the discharge of customary aggregates, the communication of these materials to site and the communication and land filling of excavated site waste.
The early preparing of a Smr stabilised working platform will supply a safe and sufficiently durable working surface on which trucks and building plant, such as piling rigs and cranes can operate.
Platforms are vital when the onsite soils are weak giving insufficient withhold or if the existing ground conditions are wet or contaminated, and good institute plan for the platform can ensure maximum efficiency of all future building processes.
Clear economic and environmental benefits can be derived from the use of platforms, particularly:
· Where increased use can be made of either site-won or recycled materials
· When platforms can be used and re-used and/or reengineered for a variety of purposes throughout the building process
· When platforms can become future permanent works.
Stabilised working platforms formed by effectively engineering the existing site soils can be utilised many times straight through a building site life-cycle; they may supply withhold for the ground works plant, early temporary way roads, avoiding degradation or enhancing the existing sub soils to enable them to be used for purpose engineered sub base, act as form work for casting pad foundations, supply a surface for steelwork erection and act as a structural element within a floor slab or pavement. In some circumstances recycled stabilised site aggregates can even be used as the piling columns themselves.
The stabilised bound goods can be produced by either ex-situ or in-situ output methods.
Soils or granular materials can be blended with our binder in a stationary mixing plant and the resulting goods located and compacted by non-specialist plant.
The blending process for our recycled goods can be carried out using a around "fixed plant" off site or "mobile plant" working within the scheme area, when space and straight through put volume allow.
The plant for laying and compaction of our goods is similar to that required for the laying and compacting of other paving materials such as unbound layers or bituminous bound products.
Alternatively, the surface soils on site can be mixed in-place with our binder using master plant such as binder spreaders and rotavators.
As compaction can take place at any time within seven days of placement. This offers vital advantages to the undertaker of a package deal in both timing and use of tool and labour.
A competent person from Soil Stabilisation Solutions Ltd will be able to estimation the likely volume/percentage of binder required from a optical examination of the site materials; this can be carried out initially so that a decision can be made, on economic grounds, on either to stride with the cost of laboratory testing of the site soils.
Some materials are difficult to stabilise because they are unsuitable chemically or may need immoderate mechanical modification. Peat and other organic soils can delay the curing of the goods and unless mixed with abundance of granular material will not covenant well.
The binder can cope any way with other difficult materials such as Sulphate rich soils which can cause swelling and disintegration of cement-bound layers and clays which other binders have difficulty drying.
When ex-situ mixing is the chosen method, the preparation, warehouse and laying of the bound goods is in fact no distinct from that required for any imported material, and the usual care and notice must be paid to its compaction, surface levels and profile.
In all cases Soil Stabilisation Solutions will be on hand in the preliminary stages to ensure methods are understood and the required specification is being met or bettered.
As with these alternative materials our recycled goods should never be laid on freezing ground or on standing water. Otherwise seasonal working is no problem at all and general summer and winter weather is not going to hold up work as the curing of the goods is not climatic characteristic critical.
The coming to platform institute should be associated to the risks which have been identified in relationship with the plant for which a platform is required and with theoperations to be carried out, as well as the pre-existing soil conditions.
A straightforward institute coming for working platforms may be standard for many routine temporary platforms
Where the stabilised layer also forms part of future permanent works, a institute recipe standard to that end use should all the time be carried out.
The institute of a working platform is a geotechnical institute process and should be carried out by a competent person.
The designer should have full way to the condition and safety plan, along with the desk study and all other site investigation information. This facts we supply is not intended to replace or cut the designer's input, but rather to wise up and educate the designer and his team of alternative and new building developments.
The platform level may be dictated by building requirements rather than by the final institute of the permanent structure.
This should be considered early in the institute and building process to ensure that where inherent working platforms can be re-used for other purposes.
Attention needs to be given to the edges of working platforms. It should be considered how near the edge of the platform plant and vehicles can be permitted while avoiding instability or break off.
With other stabilisation ideas platforms a minimum length of half a motor width is usually required for tracked plant to avoid degradation and break off, with our Smr binder this is not such a vital factor as the bound material will very speedily attach itself to the base on which it is laid and also to the surrounding ground, as the copolymer molecules (seeking out any moisture) form bonds between the platform and surrounding soils.
Sloping sites do gift single problems for stability, and these inherent problems should all the time be addressed in the platform design.
As a general rule for site platforms our binder will be added to perform strengths of around 2N/mm2 (strength class C1.5/2.0) which has been found uncostly for platforms for most building activities.
Different building processes carried out on or straight through the platform may enforce greater impel requirements that need to be taken into list in the institute of distinct areas of the platform using batch controls this impel dissimilarity can in fact be engineered in to the goods with Smr.
A platform that is very strong though it may form an ideal running surface for plant could cause problems in the building process if drainage runs need to be dug. We feel our goods is unique in this aspect as the bound impel increases without ever becoming rigid and can still be worked up to high impel levels.
The bound goods does have very low permeability, which is useful from a building point of view, but means that drainage institute will be critical, to ensure that the platform remains suitable for use and will not carry standing water.
In general this can be carried out by particular building of the platform layer. Falls can be constructed into the platform by means of grading while final compaction.
In all cases the requirements of the building timescale should be taken into list - winter working may need drainage institute for heavier rainfalls and list to be taken of the raising of the water table beneath the platform.
Similarly ice forming on the platform due to the proximity of standing water can render building activities dangerous.
In the worst cases it may be vital to put in place a granular topping layer or wearing course.
The incorporation of the preliminary platform into the permanent works can save significantly on cos
Where this is pre-planned there is a tendency on site to take greater care of the platform when it is seen as part of the permanent structure.
Examples of subsequent uses of the platform may be:
· Re-use as temporary works for later building activities, such as use of the platform for form work
· Re-use as pavement layer, for car parking and way road
Reuse may, need reworking of say the top 30mm of material and/or even re-grading.
With an Smr bound platform, these additional works can be carried out in fact and speedily on site.
