讲义分析案例long

1、Cement StabilisationCement is one of the most common construction materials that being used in pavement constructions in terms of cement stabilization, it can be use in light traffic roadways What is cement?Advantages of cementCement stabilisation is widely used to improve pavement performance as it

2、 not only provide advantage at the economical aspect, but also its considered to be environmental friendly. cement stabiliser can be applied to reduce the sensitivity to moisture, it will reduce risks of loss bearing capacity in wet conditions. Therefore the ability of resisting rutting and other ty

3、pes of deformation is improved.Advantages of cementAbility of moisture resistance will also benefit in reduce the risk of water penetration to cause soften of pavement. As a result, the durability of road surface is increased and decrease the need of maintenance.By applying cement stabiliser efficie

4、ntly can reduce the overall pavement thickness. From the environmental aspect, cement stabilisation require low quality aggregates, therefore premium quality aggregates can be conserved and the existing pavement material can be recycled.It reduces the transportation of aggregates to site if the regi

5、on is lack of quality aggregate source, thus the fuel consumption , traffic congestion and pavement wear will be minimised. Common type of cement stabiliser Portland Cement Stabilisercan be used to stabilise large range of soils, from granular soils to low plasticity clays. Highly plastic clays are

6、most effectively stabilized with lime.Cement Kiln Dust StabiliserCement kiln dust is created in the kiln during the production of cement clinker and it is commonly being used as stabiliser, because it can significantly reduce the soil plasticity and swell problem. Portland Cement StabiliserThe guide

7、line of application of Portland cement stabiliser is published by the Portland Cement AssociationCommonly for the road pavement subgrade construction, the cements setting time should be less than 2 hours The Portland cement stabiliser is suitable for gravel soils which have maximum 45 precents of so

8、ils aggregates larger than 4 sieve, and the soil plasticity index should be less than 20. Cement Kiln Dust StabiliserGenerally, there are two categories of cement kiln dust, pre-calciner kiln dust and long-wet kiln dusts. Pre-calciner kiln dust is generally coarser, higher in free lime, and concentr

9、ated with alkali volatiles. Dust from the long kilns will contain more calcium carbonate with more limited amounts of free lime A Case Study - CementA trail section of an expressway along the North-South Expressway in Malaysia in 2000. The pavement rehabilitation involved in-situ stabilization of th

10、e existing road base material using cement.The existing bituminous layers depth is about 175mm, and the in-situ cement stabilization of the road base to a thickness of 200mm. Moreover, the overlay of asphalt concrete is 230mm. The first step involved in the in-situ recycling was milling the 175mm ex

11、isting bituminous materials by using a “Wirtgen-W1000” Then, using a Caterpillar-CAT 350 stabilizer machine to perform a depth of 200mm in-situ recycling. Mix the aggregate and cement into mixing chamber of the stabilizer machine.ProcessWirtgen-W1000Caterpillar-CAT 350 The CTB was then levelled using a motor grader.Finally, using a Dyna