Ubuntu 12.10 named Quantal Quetzal

Here comes a bird with Quality in Ubuntu 12.10. After being Precious its time to focus on Quality on user perspective, this focus on type face, wallpaper, themes and other settings

In his blog post Mark Shuttleworth gave reasoning behind the codename for Ubuntu 12.10 release, which he says will focus on Quality
Quality comes from focus and clarity of purpose, it comes from careful design and rigorous practices.

 

What Causes Bleeding in HMA

Dear Friends!

I have a question regarding surface diffects (distress) which often occurs in HMA mixes. This is bleeding or flushing as others tend to name it.

In my view I tend to think this problem is caused by too much bitumen in the mix which fill all air voids. What amount is too much bitumen?

In design we tend to limit the amount of bitumen which retains air voids of 3-6% by volume of total mix

Too much voids have effects of making the layer too open which can allow water ingress and shorten the life.

Some literature suggest, bleeding is resulted from low air voids below 3% after secondary compaction.

To avoid the mix should be designed to have  4% to 8% air voids, care should be taken to ensure voids are not connected. This can be achieved by ensuring proper grading.

Robert Ngalu,

Tanga.

13/1/2012

Rock face

This is the rock we're using for Crushed Base and Surfacing (AC20 and AC14). It originates from limestone. Its strength is around 140kN to 150kN, slightly sound rock for these works.
The only draw backs i can imagine is its non-homogeneity nature. A lot of unsuitable/foreign materials were found within this rock mass, as can be seen in this picture there are some soil and dirt inside it.
But it is good if sampled well.

Ubuntu logo

Preparation of pile cap

Preparation for blinding for pile cap for Abutment at Ndoyo Bridge is underway, the area has been levelled, cleaned and checked

Subbase preparation

Laying subbase (stabilised layer to C1 quality) at 10+600 Tanga-Horohoro road. Seen in picture are roller, paver, water bouser and grader

Pile Load Testing

This is an assembly of Pile Load Test by method of "Maintained Load Test" whereby a constant load is maintained until no significant settlements are recorded then a load is changed, and process is repeated till specified load.