Alex Mrema

6 Questions 19 Answers 0 Followers

Questions related from Alex Mrema

How do we get rid of the pollution problems of waste polythene bags?

The use of polythene bags in packaging is a major cause of pollution. These bags cause environmental problems if they are not properly disposed of. One method to get rid of them is to recycle them...

30 July 2018 7,923 7 View

Why do we insist in using standard sand in cement strength tests when we can use locally blended sands?

Importing standard sand for cement tests is becoming unnecessarily expensive. Why can't we use local sands which have been blended to approximate the grading of the 'standard sand'. Would there be...

06 November 2017 6,834 8 View

What is the effect of mixing gypsum with white cement?

I have specified gypsum plaster for internal walls of a building and white cement for the external walls. Is there any consequences if the white cement is accidentally mixed with small amounts of...

01 November 2017 5,894 15 View

Why are the desorption and adsorption curves for timber different?

When studying the sorption for timber at 20 deg. C and one plots the equilibrium moisture content in volume % against the relative humidity of the surrounding air from 0% to 100% relative humidity...

09 August 2016 6,060 2 View

How can I estimate the maximum temperature reached in a concrete building that was gutted by fire?

I am investigating on the effect of a fire that gutted a concrete building. I am determining the residual strengths of the structural and building elements after the fire. Is there a way of...

26 May 2016 5,315 8 View

What is the optimum water cement ratio for maximum strength in a sand cement block?

The bulk density of sand varies with moisture content and is minimum at about 5% moisture content. At this moisture content of about 5%, the surface tension of the water film around the particles...

23 July 2015 4,252 12 View