Literature Review of Cement Matrices and Fibers Used in SIFCON

Conventional concrete is categorized as brittle. As a result, researchers continued working to develop it into a substance having ductile characteristics. Concrete showed remarkable improvement when fiber was incorporated at a ratio of 1-2%. Slurry-infiltrated fiber concrete (SIFCON) allows for the use of up to 20% more fiber when combined with unique cement slurry. Concrete that was produced had increased strength and ductility. The influence of slurry and fiber forms with different volumes on the resistance of concrete to compression, flexural, shear, and bond was the main focus of this review study. The outcomes of several previous investigations revealed a significant relationship between the strength of concrete and the slurry mixture, fiber type, and fiber volume. Additionally, it was shown that the majority of research all agreed that certain methods should be followed when employing a volume of more than 5% fiber. These processes entail employing fine-sand less than 1 mm in size to create a suitable cement slurry and replacing up to 30% of the cement with fly ash (FA), silica fume (SF), and metakaolin to create a cement slurry capable of penetrating interlocking with fiber of all forms and volumes

Static interaction in soil – pile - cap system using three-dimensional analysis

A value of interaction load along the pile shift in the pile foundations design is an important factor in calculation of the bearing capacity and consequently, not taking the interaction load into consideration cased an increase in the piles lengthy and then cost increased. In this paper, was studying the effect of skin friction on behavior of soil- raft foundation, (soil -single pile – cap) system and (soil – 2 piles group- cap) system is investigated and analyses using Abaqus software (is a 3D finite element). Parameters studied were raft footing thickness, length of square concert pile in the (soil-single piles –cap) system, the spacing ratio in the (soil-2 piles –cap) system. It was intended to investigated the skin friction distribution around the pile shaft for the (soil-single piles –cap) and (soil-2 piles –cap) system. The results showed that the mobilized interaction among raft footing and clay soil caused increases in raft capacity and reduce the value of vertical settlement compared with frictionless soil raft model and the interaction load value (skin friction) increased with increasing in raft thickness. The percentage of the increases in load capacity due to interaction mobilized was 43% compared with frictionless case. There was a clear difference in capacity load for mobilized interaction case compared to the absence of interaction between single pile and cap with soil. This increase was clear when the length of pile is more than 10 m, and this increased reaches about 67%. The distribution of interaction load along the pile shaft is linear where the interaction load is equal to zero at the head of the pile. The interaction load begins to increase when the length of pile increases. Highest value for interaction load was at the end of pile

Foundations of educational buildings in Iraq : past, present and future

Foundation is considered as one of the main parts of any structure such as buildings, railways, bridges, etc. The type of foundation used is highly dependent on the type and properties of soil. The design of foundations requires many factors that should be defined such as the load that the foundation is going to hold, geological conditions of the soil under the foundation, type of soil and the local building code criteria.There are number of differences in the geological and soil conditions in Iraq. As a consequence, these differences are reflected on the type of foundation to be used. Despite these differences, same materials and style of buildings are used all over Iraq. To have good information about the materials and the required design of the foundation, a comprehensive historical review was executed to highlight the progress of the materials and types of foundation that was used since the dawn of civilization up to the present (ancient, Islamic, Ottoman and British occupation till after independent). Present day situation had been analysed through a case study which illustrated the link between soil and foundation types in three different parts of Iraq (Mosul, Baghdad and Basrah). One building was analysed using STAAD. Pro software in these regions. Furthermore, the same building was analysed using local materials, which were historically used and was compared with present day materials used.It is evident that Iraqi designers and engineers require local code to define all the loads, materials and design of the foundation to be used. The use of local materials might be very effective from both engineering and economic perspectives.Godkänd; 2013; 20130514 (entalt); Tillkännagivande licentiatseminarium 2013-05-23 Nedanstående person kommer att hålla licentiatseminarium för avläggande av teknologie licentiatexamen. Namn: Entidhar Altaie Ämne: Geoteknik/Soil Mechanics and Foundation Engineering Uppsats: Foundations of Educational Buildings in Iraq: Past, Present and Future Examinator: Professor Sven Knutsson, Institutionen för samhällsbyggnad och naturresurser, Luleå tekniska universitet Diskutant: Professor Rafid Alkhaddar, School of the Built Environment, Liverpool John Moores University, Liverpool, UK Tid: Fredag den 14 juni 2013 kl 10.00 Plats: F1031, Luleå tekniska universite

Effect of bearing capacity on designing foundations in Iraq using STAAD Pro- v8i

Most of Iraqi soil is classified as Quaternary deposits, especially in the Mesopotamian plain and tributaries of the River Tigris. Soil varies from north to south of Iraq. These differences in soil af-fected the process to select the suitable type of foundation. This research is to study the effect of bearing capacity on shallow foundations in different regions of Iraq. Seventy nine samples were collected from 23 boreholes at three different locations (Mosul at the North, Baghdad at the middle and Basrah at the south of Iraq). The samples were collected at varying depth between 1 to 24m. They were subjected to the following testes: Atterberg limits, sieve and hydrometers, consolidation, direct shear, unconfined compression and the filed (SPT test). The values of the bearing capacity parameters (ϕ and c) were obtained from the above tests. The results obtained were used in the application of the general equation of the bearing capacity. Then, the model of a building was designed (two floors, with mat foundation type) using STAAD Pro software. The average values of bearing capacity in each region were applied in the program (Mosul= 177KPa, Baghdad= 125KPa and Basrah= 84KPa). In addition, the worst bearing capacity values were also used for the three regions (Mosul = 77KPa, Baghdad= 68 KPa and Basrah= 24KPa). The results obtained from the average and worst bearing capacity indicated that for Mosul, we could use shallow foundation (spread and mat used if there was basement) for different areas and for buildings with many sto-ries. For Baghdad region, shallow foundation was more suitable for building not higher than five stories. Finally, for Basrah region, shallow foundations were an appropriate selection, but for most areas deep foundation was the right choice.Validerad; 2014; 20140422 (nadhir

Bearing Capacity Affecting the Design of Shallow Foundation in Various Regions of Iraq Using SAP200 & SAFE softwares

Bearing pressure is the load per unit area along the foundation bottom. The value of bearing pressure can be obtained from soil exploration. In this research, three sites in Iraq were tested (Mosul at north, Baghdad at middle and Basrah at south) for the best type of foundation to be chosen. Seventy nine samples were taken from twenty three boreholes drilled to a depth ranging from 1to 24m, from various sites for the three sites. Samples were tested for their size; Atterberg limits; direct shear; unconfined compression; consolidation and SPT tests. The results showed that the nature of soil in Mosul was generally were silty clay to clay (in some areas silt or sand) with high to very high plasticity. In Baghdad, it was loam clay, silty clay, and in some areas silt. Its plasticity range was medium to high and non-plastic in few sites. For Basrah, the soil type was clay loam and in many places was sand or silt. The value of plasticity was medium. The average and the worst values of bearing capacity were: 177KN/m2 and 77KN/m2 for Mosul; 125 KN/m2 and 68 KN/m2 for Baghdad; and 84KN/m2 and 24 KN/m2 for Basrah. These values were used in a computer model (SAP2000 and SAFE softwares) to find the best suitable foundation in each site. The model suggests that spread or continuous and raft (if basement is used for building with many floors) are suitable for Mosul. For Baghdad, spread and raft type of foundations are suitable. While, for Basrah, raft foundation type are to be used in some areas where building should be less than three floors and for other areas, deep foundation (piles or pier) can only to be used.Validerad; 2014; 20140717 (nadhir)</p

The need to develop a building code for Iraq

Building Code is a legal document provided a minimum level of safety and health for the construc-tions to make public living in safe buildings. People recognize the importance of constructing the buildings in safe conditions, since the dawn of civilization. Many countries around the world were facing different kind of disasters such as fires, earthquakes, etc. These disasters made builders to develop methods for safe construction to avoid any disaster. Later, these developments became codes and standards. Since, the middle of the last century many countries established its local codes. This research represents a review of the importance of the codes with a short history for them. Furthermore, reviews for some national codes (Egyptian, Syrian and Arabia Saudi) were done as well as comparison between load’s correction factors, geotechnical requirements and materials used in concrete. Most of the national codes were highly based on the ACI, British and Germany codes and standards. In addition, a review and comparison were presented for International codes (American (ACI) and European (EC)) through a case study. EC code is becoming more common for the world. Eurocode give more flexibility to the user to employ their own standards (national annex). To find the best suitable foundation design to be used in Iraq and the differences when using the American and European codes, a building model was designed and analyzed using STAAD Pro., and SAFE softwares for three locations (Mosul, Baghdad and Basrah). The combination loads used in the two softwares were for ACI and EC codes. Results obtained were very similar. The type of foundation to be chosen for Mosul location is spread or continuous. For Baghdad location the suitable type is raft and for Basrah the choice is raft and piles.In view of the fact that Iraq has no national code engineers and designers were depending on the ACI and British codes and standards. It is very important to have an Iraqi code because it will im-prove the quality and safety of the design and construction of buildings as well as its economic value.Validerad; 2014; 20140801 (nadhir

Evaluation of Foundation Settlement under Various Added Loads in Different Locations of Iraq Using Finite Element

Settlement is an important criterion in the design of the foundations. It is classifying into immedi-ate (or elastic) settlement and consolidated settlement (primary and secondary). The factors that affect the shallow foundation settlement are the applied loads, soil stiffness, and geometric shape of foundation. Calculations of settlement depend on the parameters of soil which can be obtained from field and laboratory tests. Field and laboratory tests were conducted for twenty three sites in three different regions in Iraq (Mosul, Baghdad, and Basrah). In this research, field and laboratory tests results adopted for two sites from each region depended on the maximum and minimum bearing capacity values. Settlement for each site was calculated using numerical (mathematical) calculations and PLAXIS software under different added loads. The results of settlements beneath the foundation were competing for the sites with maximum value of bearing capacity in Mosul; Baghdad and Basrah. Also, the comparison conducted for sites of minimum bearing capacity value and the results showed different settlement values of each site. The change of settlement values under different loads was linearly in the six sites using numerical (mathematical) calculations. While, the settlement values obtained from PLAXIS software for sites with maximum bearing ca- pacity value showed that Mosul site had the highest value due to the type of soil layers and the dif- ference models of soil used in the software. Basrah site had a settlement value higher than Bagh- dad site due to the soil layers of sand type only. PLAXIS results for sites with minimum bearing capacity showed that for Basrah site the soil went to failure. While, the settlement values for Mosul and Baghdad sites were close to each other due to have nearly same soil layers. Therefore, high rise buildings could not be used in some sites. Also, soil in some locations and under some added loads needed to be improved before the implementation of any constructions.Validerad; 2016; Nivå 1; 20160512 (nadhir

Foundation assessment in different parts of Iraq using STAAD Pro v8i

Foundation is considered as one of the main parts of any structure such as buildings, railways, bridges, etc. The type of foundation used is highly dependent on the type and properties of soil. The design of foundations requires many factors that should be defined such as the load that the foundation is going to hold, geological conditions of the soil under the foundation, type of soil and the local building code criteria.There are number of differences in the geological and soil conditions in Iraq. As a consequence, these differences are reflected on the type of foundation to be used. Despite these differences, same materials and style of buildings are used all over Iraq. The main problems of Iraqi soil are high gypsum content, salinity and shallow water table depth. These factors that influence the foundations are the soil properties and the amount of loads that transmitted by the superstructure.The situation had been analysed through a case study which illustrated the link between soil and foundation types in three different parts of Iraq (Mosul, Baghdad and Basra). One building was analysed using STAAD. Pro software in these regions. It is evident that Iraqi designers and engineers require local code to define all the loads, materials and design of the foundation to be used. The use of local materials might be very effective from both engineering and economic perspectives.Validerad; 2013; 20130129 (nadhir)</p