History and Development of Portland Cement Portland cement, arguably one of mankind's most important manufactured materials, was invented and patented by Joseph Aspdin from Leeds in 1824. Aspdin produced cement by heating powdered limestone mixed with clay in a furnace, and grinding the resulting clinker to a powder. He called the product "Portland Cement" because...
Concrete and screed and are essentially formed of the same basic ingredients - cement, aggregates and water. But what makes them different is- the size of aggregates, the cement grade, mix consistency, and of course their intended application or use. Composition and Mix Proportion Concrete in its simplest form is a rock like mass formed by...
Before we get into the advantages and disadvantages of manufactured sand, what exactly is manufactured sand? Manufactured sand is sand produced by crushing rocks, quarry stones or larger aggregates pieces into sand-sized particles. Natural sand, on the other hand is the naturally formed sand extracted from river beds. The Manufacturing Process Rocks or quarry stones are...
Aggregates are inert, granular materials which form a major component of screed and concrete mixes. With urban expansion and environmental constraints putting a strain on the naturally occurring aggregate sources such as sand, gravel and crushed rock, the construction industry is now widely exploring other sustainable and economically viable resources, to meet their ever-growing...
Our collaboration with Tomorrows Flooring to raise awareness in the floor screeding industry continues with the next instalment of the Screed Scientist content appearing in the September 2013 edition. See page 22 of this link: http://content.yudu.com/A2dukg/TFSept13/resources/index.htm?referrerUrl=http%3A%2F%2Fwww.tomorrowsflooring.com%2F The article covers: Right from verifying the suitability of the screed specification before commencing screeding to the post-installation measures of...
Surface Regularity Fail Surface Regularity Pass Surface regularity is generally defined as the limitation of deviation of the surface beneath a straightedge laid flat on the surface. As the measurement criteria varies for different types of screeds and flooring, it is important to ensure that the measurement is in compliance with the particular specification. Furnished here are...
We are very pleased and honored to announce that the Screed Scientist initiative has gained some incredible attention. What started out as just a little bit of a frustration around the lack of awareness about best practices in our industry culminated in a reaction to put out some good stuff to help ourselves, our...
Is seems there is much confusion in the industry around the concepts of the “flatness of screed” and the “levels” of screed. In an attempt to demystify these two very different concepts we have created some diagrams to explain the passing and the failing conditions. See below. Surface Regularity Fail Departure from Datum Fail To see the...
We are chuffed to bits to get some great feedback. If you have been following us for long enough you will know that The Screed Scientist initiative was designed to raise awareness in our industry to address a whole range of issues. Screed failure need not be an acceptable statistic. We strongly believe that...
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