Posts by Kanwarjot Singh

Vincent T. H. CHU is renowned internationally as walking encyclopedia of civil engineering. He is the recipient of the Ombudsman’s Award 2007 under complaint-related category and Young Engineer of the Year Award 2008 (Merit) organized by the Hong Kong Institution of Engineers. The followings are the major achievements of Vincent Chu over the past few years:

(I) Extreme Popularity of Engineering Books on International Scale
Vincent Chu is the author of five internationally popular civil engineering books, namely “200 Questions and Answers on Practical Civil Engineering Work” , “Civil Engineering Practical Notes A-Z”, “Ask Vincent Chu (Common FAQ on Practical Civil Engineering Works)”, “The Underlying Reasons in Practical Civil Engineering Works” and “A Closer Look at Prevailing Civil Engineering Practice – What, Why and How” which entail a list of useful practical experience, Q&As and knowledge that engineers should acquire. The five books were written within 5 years (2005-2009) and they obtained overwhelming good comments from engineers around the world. They are the “must-read” engineering books of a civil engineer.
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Higher porosity of recycled aggregate compared to natural aggregate leads to a higher absorption. Moreover, recycled aggregate has lower specific gravity than natural aggregate and will make concrete with higher drying shrinkage and creep.

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For carbon dioxide attack, carbon dioxide dissolves in water to form a weak acid called carbonic acid. It would dissolve the cement matrix. However, the amount of carbon dioxide from the atmosphere is usually not sufficient to cause harm to concrete structures until additional source of carbon dioxide is available (e.g. decaying vegetable matter).

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Flakiness Index is the percentage by weight of particles in it, whose least dimension (i.e. thickness) is less than three-fifths of its mean dimension. Elongation Index is the percentage by weight of particles in it, whose largest dimension (i.e. length) is greater than one and four-fifths times its mean dimension.

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Spatterdash is a mixture of one part of cement to one and a half parts of coarse sand with enough water. The mixture is thrown forcibly onto the wall so that the impact removes the water film at the interface between spatterdash and the substrate leading to the improvement in adhesion.

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Pervious concrete is sometimes called “no fines” concrete. It is designed with high porosity and allows water to pass though. It is commonly used in concrete pavement so as to reduce surface runoff and allow the recharging of ground water. The high porosity is achieved by a network of interconnected void. “No fines” concrete has little or no fines and contains just enough cement paste to cover the surface of coarse aggregates while maintaining the interconnectivity of voids.

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Shotcrete is not a special product of concrete and it is not a special method of placing concrete. In dry-mix method the dry cementitious mixture is blown through a hose to the nozzle, where the water is injected immediately. The dry-mix method appears to be better for low volume placements. The nozzleman should pay great attention in adding the necessary amount of water during shooting operation.

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Based on the results of past research, there is minimal impact on the properties and performance of concrete by liquid nitrogen (LN). The addition of liquid nitrogen appears to decrease the slump value of fresh concrete. However, the slump loss is not caused by liquid nitrogen but by previous hot concrete mix, i.e. the slump of LN-cooled concrete is the same of original hot concrete. Liquid nitrogen can also be observed to extend the setting time of concrete.

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The addition of water to fresh concrete in truck mixer upon arrival at the location of concrete is allowed only if some design mixing water is held back during initial mixing stage. Addition of water in excess of design mixing water would definitely cause an increase of water cement ratio leading to a reduction of concrete strength.

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KAUSHAL KISHORE has written, published and presented over 150 research papers, including four books pertaining to Concrete Technology, Materials Testing, Concrete Mix Design, Quality Control, Construction Chemicals, Ready Mixed Concrete, Grouting & Gunating Work, Repair, Rehabilitation and Waterproofing of Buildings.

Contact Address
Er. KAUSHAL KISHORE,
New H. No. 571 (Old H. No. 152/7A), Solanipuram, Behind Shiv Temple
ROORKEE-247667
Uttarakahd
INDIA
E-mail Address: kkmengg @ yahoo. co .in [ remove spaces]

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