Biography of Dr. Saaid (last version)

The design of concrete mixture is a systematic task that is outlined in different standards , specifications , and codes of practice the steps followed in the design in most of specifications are nearly the same , since the design of concrete mixes requires the proportion of the three basic ingredients (water , cement , aggregates) . In this paper three equations have been designed using multi regression analysis program (Graph pad) to join three known parameters namely : (characteristic strength , cement content, and workability) with three main unknown ingredients (water , cement and aggregates) . These simple equations can be solved easily using EES program to get the required unknowns . Also advanced calculators can solve these simple equations easily. This study was carried out on 61 concrete mix in HBRC Material Laboratory .

Nanotehnologii v Stroitelʹstve, 2015

The aim of this work is to study the effect of fly ash (FA) and nanosilica (NS) on the durability of cement pastes under normal and aggressive curing condition. Different mixes were made with various amounts of NS and constant value of FA (10% by weight of cementitious materials). First group of samples were subjected to normal curing and tested after 3, 7, 28 days and after one year, while the second group of samples were subjected to sulphuric acid of concentration 0.2 N and tested after the same ages. The hydration process and durability of cement pastes were monitored using scanning electron microscope (SEM). The results of this study indicated that FA of percentage 10% and nanosilica of percentage 1% of cementitious materials improve the durability and microstructure of cement pastes against both normal and aggressive curing conditions.

In terms of the importance of restoring heritage buildings in Egypt, this research was initiated with the objective of evaluating the effect of usinginvestigating the impact of employing nanatechnology during rehabilitation on the concrete mechanical and physical properties, where Engineering Syndicate Building, in Ramses Square, was taken as a case study. A reseach methodology was planned to encompass theoretical, experimental, analytical and inferential investigations. Throughout the theoretical investigation, literature in the field of restoring heritage buildings and nanothnology were assembled and scrutinized. During the experimental investigation, nanoparticles mixes were produced (i.e. Nano Calcuim carbonate (CaCO3)and Nano kaolin (NK)). In addition, hybrid nanoparticle mixes, with different proportions of nano-CaCo3 and NK, were obtained. For comparison purposes, a reference mix was prepared. Furthermore, the impact of implementing nanoparticles, with different proportions, on concrete mechanical so as physical properties was examined. In addition, employing such mixes in old concrete restoration was investigated. All through the analytical investigation, the results were analyzed and interpreted. During the inferential investigation, conclusions so as recommendations were inferred. The results indicated that adding nanoparticles reduced the concrete

Nanotechnologies in Construction: A Scientific Internet-Journal

http://nanobuild.ru Editorial.Council,.Editorial.Board.and.the.editorial.staff.second.the.politics.aimed. at.observance.of.ethical.publishing.principles.and.recognize.that.keeping.track.of. observance.of.ethical.publishing.principles.is.one.of.the.main.components.in.reviewing. and.publishing.activities..The.basic.ethical.principles.of.reviewing.and.publishing.are. available.at.website.http//www.nanobuild.ru. The.authors.of.the.published.materials.are.responsible.for.the.reliability.of.the. presented.information.and.utilization.of.the.data.which.are.not.to.be.published. avowedly..The.editors.have.the.right.to.make.corrections..The.opinion.of.the.editors. can.be.different.from.the.authors'.opinions,.the.materials.are.published.to.discuss.the. up-to-date.problems..The.editors.are.not.responsible.for.the.content.of.advertisement.. Any.full.or.partial.reprinting.of.the.materials.is.possible.only.with.editors'.written. permission.

http://nanobuild.ru Editorial.Council,.Editorial.Board.and.the.editorial.staff.second.the.politics.aimed. at.observance.of.ethical.publishing.principles.and.recognize.that.keeping.track.of. observance.of.ethical.publishing.principles.is.one.of.the.main.components.in.reviewing. and.publishing.activities..The.basic.ethical.principles.of.reviewing.and.publishing.are. available.at.website.http//www.nanobuild.ru. The.authors.of.the.published.materials.are.responsible.for.the.reliability.of.the. presented.information.and.utilization.of.the.data.which.are.not.to.be.published. avowedly..The.editors.have.the.right.to.make.corrections..The.opinion.of.the.editors. can.be.different.from.the.authors'.opinions,.the.materials.are.published.to.discuss.the. up-to-date.problems..The.editors.are.not.responsible.for.the.content.of.advertisement.. Any.full.or.partial.reprinting.of.the.materials.is.possible.only.with.editors'.written. permission.

The aim of this work is to study the effect of fly ash (FA) and nanosilica (NS) on the durability of cement pastes under normal and aggressive curing condition. Different mixes were made with various amounts of NS and constant value of FA (10% by weight of cementitious materials). First group of samples were subjected to normal curing and tested after 3, 7, 28 days and after one year, while the second group of samples were subjected to sulphuric acid of concentration 0.2 N and tested after the same ages. The hydration process and durability of cement pastes were monitored using scanning electron microscope (SEM). The results of this study indicated that FA of percentage 10% and nanosilica of percentage 1% of cementitious materials improve the durability and microstructure of cement pastes against both normal and aggressive curing conditions. МашиночитаеМая инфорМация о CC-лицензии в Метаданных статьи (HTML-код): <a rel=»license» href=»http://creativecommons.org/licenses/by-sa/4.0/»><img alt=»Лицензия Creative Commons» style=»border-width:0» src=»https://i.creativecommons.org/l/by-sa/4.0/88x31.png» /></a><br />Произведение «<span xmlns:dct=»http://purl.org/dc/terms/» href=»http://purl.org/dc/dcmitype/Text» property=»dct:title» rel=»dct:type»>Quasi-homogenous approximation for description</span>» созданное автором по имени <a xmlns:cc=»http://creativecommons.org/ns#» href=»http://creativecommons.org/licenses/by/4.0/» property=»cc:attributionName» rel=»cc:attributionURL»>Kudryavtsev P.G., Figovsky O.L. </a>, публикуется на условиях <a rel=»license» href=»http://creativecommons.org/licenses/by-sa/4.0/»>лицензии Creative Commons «Attribution-ShareAlike» («Атрибуция — На тех же условиях») 4.0 Всемирная</a>.<br />Основано на произведе-нии с <a xmlns:dct=»http://purl.org/dc/terms/» href=»http://nanobuild.ru/en_EN/nanobuild-3-2015-pages-27-28/» rel=»dct:source»>http://nanobuild.ru/en_EN/nanobuild-3-2015-pages-27-28/</a>.

Until the late 1930s, there was no research on the durability of concrete. The first discussion for the concrete deterioration and durability was the second symposium at Stockholm in 1938. After this period, several conferences were held with many reports and papers being presented on durability and deterioration of concrete structures[1]. The history repeats itself again where, studying the impact of Nanomaterials on concrete durability through researches and studies has not been achieved yet as required, although these material had been used in some places for more than 20 years. where ,most of this studies which interested in investigating the durability issue deal with cement paste and cement mortar and a few of them deal with concrete in some properties. From this point of view, this research come to compensate the shortage of this issue by studying the effect of using the nanosilica and nanoclay and hybrid from both of them on some durability properties of concrete produced with the three materials as a partial replacement of cement at three ratios for each one. The experimental program of this study consists of nine blended concrete mixtures (three nanomaterials and three ratios of replacement for each one) besides to the control mixture. Each mix had a number of specimens sufficient to study the following durability properties of the blended concrete :-Resistance to exposure to aggressive media at 3 , 6 , 12 month.-The water permeability.-Resistance of the elevated temperature at 400 o C and 600 o C .-The compressive strength at 7 , 28 ,56 day. The material characteristics , the procedures of specimens preparation , the tests set up ,and the test results and discussion are described in detail. Results of experimental work showed that; Nanomaterials are efficient in improving the concrete durability in most of measured properties with different levels of improvement according to the type of the nanomaterial and the ratio of replacement. Optimum replacement ratios are proposed for each type of the nanomaterials. Also, results yielded that nanoclay is more effective than the nanosilica and hybrid nanosilica-nanoclay in enhancing the durability properties of concrete.

2019

Although sustainable building techniques and materials have always been used in the residential sector in Egypt, the calls for strategies to implement more environmentally friendly ways of the building have been rising. The study presents considerations on how and what can be done to make a sustainable and at the same time affordable design, not only with highly sophisticated systems; analyses the suburbs surrounding Cairo, describes case studies that have shown environmentally friendly solutions and concludes with a synoptic framework for affordable environmentally sustainable strategies which can be used for the housing sector.

The aim of this work is to study the effect of nanomaterials on the properties of cement paste, the experimental program included three parts: a-two types of nanosilica, locally produced NS1 and imported NS2, b-nanoclay (NC) and c-Hybrid nanoparticles (NS1 & NC). In each part, cement paste was used with different percentages of nanoparticles. Compressive strength and drying shrinkage tests were applied in each part on the cured and uncured samples. The results showed that the compressive strength improved in the cement paste mixtures in the cured condition, the optimum percentages was 1% for NS1, 1% for NS2, 5% for NC, and 5% (0.5%NS1 & 4.5%NC) for hybrid nanoparticles. The drying shrinkage increases with adding nanosilica and hybrid nanoparticles, while it decreases when adding NC.