Science And Technology Of Concrete Admixtures
The aim of using P and SP is to adequately modify the rheological properties of the fresh concrete according to the technology used and the conditions for the implementation process of concreting. The basis for evaluating the effectiveness of these additives is measuring their impact on the changes of their rheological properties and workability. Therefore, the effectiveness tests of these admixtures focus primarily on the identification effect on the rheology of fresh concrete under certain technological conditions and the possibility of side effects of the admixtures, such as changes in the aeration of the mix or changes in the heat release curve during cement hydration. For this purpose, it is necessary to adopt a rheological model of the fresh concrete, and then measure the changes in its rheological parameters alongside the air content in the mix and changes in the nature of heat release during the hydration process, as a result of the addition of an admixture in terms of the variable factors and type of the concrete components.
Science and technology of concrete admixtures
The only one of its kind on the U.S. East Coast, this hands-on program dives into science and math. Explores diverse admixtures and their applications. Invites creativity with decorative designs. And prepares graduates with the specialized skillset not just to thrive in the industry, but to lead it.
Meet Professor Kruppenbacher and take a walk through the Building Technologies Center at Penn College. Check out the expansive lab spaces where you'll learn how to do everything from framing, roofing, hanging drywall, and installing flooring. You'll also learn more about the concrete science technology major and see the concrete labs.
1.Production and application technology of concrete and mortar admixture, Project entrusted by the enterprise, 20202.Polycarboxylate based Water Reducer with high water reducing rate and high slump retention, synthesis method and application method, Project entrusted by the enterprise, 20203.Study on the Shrinkage reducing type polycarboxylate based Water Reducer suitable for raw materials in Xuzhou, Project entrusted by the enterprise, 20194.Development of alkali free liquid flash setting accelerator and production technology with fluorine industry raw materials, Project entrusted by the enterprise, 20195.Cement based grouting material for grouting reinforcement of coal mine support, Project entrusted by the enterprise, 20196.Popularization and application of complete set technology of foamed concrete preparation with less clinker cement based on slag powder (steel slag powder), Project entrusted by the enterprise, 20187.Research and application of using local raw materials to develop super high performance concrete, Project entrusted by the enterprise, 20188.Development and application technology of non calcined desulfurized gypsum steel slag powder composite cementitious material, application of steel slag powder fly ash composite admixture in concrete, improvement technology and product application of desulfurized gypsum calcined to prepare hemihydrate gypsum, Project entrusted by the enterprise, 20179.Research on crack control technology of concrete structure in Nanchang Metro Station, 201610.A kind of color recycled concrete for producing decorative block, Project entrusted by the enterprise, 201611.Preparation and application of green building materials with regional raw materials, the National Key Technology R&D Programs in the 13th Five-year Plan of China (2016YFC0701004)12.Preparation and application of functional building materials with desulfurized gypsum and phosphogypsum, National 12th Five Year Plan of science and technology support project (2012BA20B0213.Design of composite cementitious material system of hydraulic non calcined waste gypsum, National 12th Five Year Plan of science and technology support project (2011BAE14B0614.Research on decorative concrete block and decorative brick for rural building, National 11th Five Year Plan of science and technology support project(2006BAJ05B01-03)15.Effect of paramagnetic substances in cement / admixture on NMR signal of paste, the National Natural Science Foundation of China (51178339)16.Study on the behavior of water migration in cement-based materials in plastic stage by NMR, the National Natural Science Foundation of China (51678441)17.Study on heat damage and its control mechanism of steam curing concrete prefabricated components in high speed railway, the National Natural Science Foundation of China (U153420040)18.Study on the mechanism of hydration and hardening of Portland cement by exogenous and primary sulfatethe National Natural Science Foundation of China (51132010)19.Development and application of new high performance building energy saving materials, the Social Development Science and Technology Field Projects of Shanghai Science and Technology Commission (19DZ1202702)20.Study on the performance and optimization technology of concrete, the main material of civil engineering under meteorological conditions, the Social Development Science and Technology Field Projects of Shanghai Science and Technology Commission(19DZ1201404)21.Development and key application technology of ultra-high performance concrete for photovoltaic integrated building, Special Fund Project of Shanghai Economic and Information Technology Commission (Shanghai CXY-2016-012)22.Development and application of Ultra High Performance Concrete, Shanghai "Alliance Plan" Project in 2019 (LM201947)23.Research on key technology of inorganic thermal insulation mortar based on desulfurization gypsum, Shanghai urban rural development and Transportation Committee (20101311)
KZJ New Materials Group implements intellectual property strategy and sticks to the development path of technical innovation and industrialization of science and technology achievements with independent intellectual property rights. Having been innovative and enterprising in R&D, manufacturing, promotion and service of new products, KZJ has become a pioneering technological enterprise group leading the concrete additive industry.
The product R&D of KZJ New Materials Group is conducted and finished by the Technology and Information Center (hereafter called "the centre" or "TIC") of its parent company----Xiamen Academy of Building Research Group Co., Ltd. The centre is powerful in the R&D in concrete additive field. As an authority scientific research institution in building field in China, the Centre is the largest construction science and technology research base in Fujian province and the technical support unit of Fujian Province Concrete Engineering and Technology Research Centre as well.
Ma Xiuxing, Ph.D, professor-level senior engineer, member of 11th Fujian Provincial Committee of Chinese People's Political Consultative Conference, founder of KZJ New Materials Group, is now the board director and vice president of XMABR Group and CEO of KZJ New Materials Group. Having been devoted herself to the development of new environment-friendly and energy-saving construction materials, Ma Xiuxing has acquired a number of research results of higher scientific value including 2 of international advanced level and 6 of national advanced level. She has won Xiamen science and technology progress award 3rd prize three times, Fujian province construction science and technology progress award 2nd prize twice and 3rd prize once, and Fujian province science and technology award 2nd prize once. As an expert in Fujian province new building materials field, Ma Xiuxing has more than 10 professional papers successively published on national and provincial key journals, and leads the company to realize industrialization production for a number of products, which has created significant economic and social benefits.
A main research topic is the working mechanisms of chemical admixtures. On this front, he is laying the scientific basic for the molecular design of compounds that reduce the environmental footprint of concrete. An additional area of intensive research is digital fabrication with concrete. This activity is developed with this Swiss National Competence Centre on Digital Fabrication in Architecture for which Prof. Flatt is currently Deputy Director.
Roller compacted concretes are concretes with a dry consistency and zero slump, often preferred in road and dam applications, and stand out with their advantages such as being able to be constructed and put into use quickly. As in conventional concrete production, the use of chemical or mineral admixtures, water/cement ratio, cement type and cement content, concrete mix design affect mechanical properties of roller compacted concretes (Yazici, 2008; Kilic and Gok, 2021a). Roller compacted concretes exhibit different properties compared to normal concrete, as they are much drier concretes. Although various admixtures used in conventional concrete can also be used in these concretes, it may be necessary to change the admixture dosage in order to achieve the targeted concrete performance. According to Hazaree (2010), higher dosages of chemical admixtures are needed in the production of roller compacted concrete compared to conventional concrete. On the other hand, excess use of admixtures may affect concrete properties negatively. The excess use of superplasticizers causes the presence of excess water that fills the pore volume, this water leaves the voids in the hardened roller compacted concrete matrix by drying, and then microcracks develop in the concrete during loading, premature fracture occurs and bending strength reduces (Adamu et al., 2017a). Addition of plasticizers in roller compacted concrete decreases the concrete porosity, creates a denser concrete structure, and increases the thermal conductivity of concrete (Hashemi et al., 2020).
Mineral admixtures (e.g. fly ash, silica fume, rice husk ash) can be used to improve some fresh and hardened concrete properties in roller compacted concretes, as well as steel or polypropylene fibers and chemical admixtures (e.g. water reducers, accelerators, retarders, etc.) (Harrington et al., 2010; Modarres and Hosseini, 2014; Pektas, 2015; Sengun et al., 2017; TCMB, 2018; Nero, 2019; Yetim and Yilmaz, 2019; Shen et al., 2020; Hashemi et al., 2020; Mardani-Aghabaglou et al., 2020; Kilic and Gok, 2021c). Since super plasticizers reduce the water requirement in concrete mixture, the compressive strength increases due to the decrease in the water/cement ratio with the use of super plasticizers (Kilic, 2014). In roller compacted concretes, water-reducing admixtures are used to improve workability, increase the consistency, decrease the water/binder ratio and increase the concrete strength by helping the dispersion of the cement paste (Adamu et al., 2017b). Apart from these admixtures, studies have also been conducted on the use of cationic asphalt emulsion as an admixture in roller compacted concrete production (Dareyni et al., 2018). 041b061a72