Experimental Research on the Preparation of Heat-Resistant Concrete Using Normal Portland Cement

2014 ◽  
Vol 852 ◽  
pp. 490-495
Author(s):  
Jing You Hu ◽  
Jian Bin Xie ◽  
Shan Guang Qian ◽  
Jian Feng Huang
Keyword(s):  
Fly Ash ◽  
Portland Cement ◽  
Experimental Research ◽  
Raw Materials ◽  
Engineering Application ◽  
Mixing Process ◽  
Mixture Ratio ◽  
Heat Resistant ◽  
Mechanical Performances ◽  
Mixture Ratio Design

Based on the heat-resistant mechanism, the orthogonal experimental method and the requirements for physical-mechanical performances of heat-resistant concrete, one mixing process project was taken as the target for analysis on the mixture ratio design of heat-resistant concrete. The conventional raw materials such as normal Portland cement, common crushed aggregates, fly ash and concrete admixture were adopted to manufacture the C30 heat-resistant concrete which gets the limit heat-resistant temperature of 500°C subsequently. And the influencing factors on the strength of heat-resistant concrete were also studied in this paper. Experimental results show that the mixture ratio design of heat-resistant concrete in this paper is reasonable. The engineering application results also show it is financially viable that adopting the normal Portland cement to manufacture the heat-resistant concrete with limit heat-resistant temperature of 500°C.

scholarly journals Strength Development and Elemental Distribution of Dolomite/Fly Ash Geopolymer Composite under Elevated Temperature

Materials ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 1015 ◽  
Author(s):  
Emy Aizat Azimi ◽  
Mohd Mustafa Al Bakri Abdullah ◽  
Petrica Vizureanu ◽  
Mohd Arif Anuar Mohd Salleh ◽  
Andrei Victor Sandu ◽  
...  
Keyword(s):  
Elevated Temperature ◽  
Fly Ash ◽  
Portland Cement ◽  
Ordinary Portland Cement ◽  
Raw Materials ◽  
Liquid Sodium ◽  
Strength Development ◽  
Elemental Distribution ◽  
Distribution Analysis ◽  
Geopolymer Composites

A geopolymer has been reckoned as a rising technology with huge potential for application across the globe. Dolomite refers to a material that can be used raw in producing geopolymers. Nevertheless, dolomite has slow strength development due to its low reactivity as a geopolymer. In this study, dolomite/fly ash (DFA) geopolymer composites were produced with dolomite, fly ash, sodium hydroxide, and liquid sodium silicate. A compression test was carried out on DFA geopolymers to determine the strength of the composite, while a synchrotron Micro-Xray Fluorescence (Micro-XRF) test was performed to assess the elemental distribution in the geopolymer composite. The temperature applied in this study generated promising properties of DFA geopolymers, especially in strength, which displayed increments up to 74.48 MPa as the optimum value. Heat seemed to enhance the strength development of DFA geopolymer composites. The elemental distribution analysis revealed exceptional outcomes for the composites, particularly exposure up to 400 °C, which signified the homogeneity of the DFA composites. Temperatures exceeding 400 °C accelerated the strength development, thus increasing the strength of the DFA composites. This appears to be unique because the strength of ordinary Portland Cement (OPC) and other geopolymers composed of other raw materials is typically either maintained or decreases due to increased heat.

scholarly journals Evaluation of the Ecotoxicological Potential of Fly Ash and Recycled Concrete Aggregates Use in Concrete

2020 ◽  
Vol 10 (1) ◽  
pp. 351 ◽  
Author(s):  
Patrícia Rodrigues ◽  
José D. Silvestre ◽  
Inês Flores-Colen ◽  
Cristina A. Viegas ◽  
Hawreen H. Ahmed ◽  
...  
Keyword(s):  
Fly Ash ◽  
Portland Cement ◽  
Daphnia Magna ◽  
Raw Materials ◽  
Construction Materials ◽  
Recycled Concrete ◽  
Experimental Program ◽  
Concrete Aggregates ◽  
Recycled Concrete Aggregates ◽  
Natural Aggregates

This study applies a methodology to evaluate the ecotoxicological potential of raw materials and cement-based construction materials. In this study, natural aggregates and Portland cement were replaced with non-conventional recycled concrete aggregates (RA) and fly ash (FA), respectively, in the production of two concrete products alternative to conventional concrete (used as reference). The experimental program involved assessing both the chemical properties (non-metallic and metallic parameters) and ecotoxicity data (battery of tests with the luminescent bacterium Vibrio fischeri, the freshwater crustacean Daphnia magna, and the yeast Saccharomyces cerevisiae) of eluates obtained from leaching tests of RA, FA, and the three concrete mixes. Even though the results indicated that RA and FA have the ability to release some chemicals into the water and induce its alkalinisation, the respective eluate samples presented no or low levels of potential ecotoxicity. However, eluates from concrete mixes produced with a replacement ratio of Portland cement with 60% of FA and 100% of natural aggregates and produced with 60% of FA and 100% of RA were classified as clearly ecotoxic mainly towards Daphnia magna mobility. Therefore, raw materials with weak evidences of ecotoxicity could lead to the production of concrete products with high ecotoxicological potential. Overall, the results obtained highlight the importance of integrating data from the chemical and ecotoxicological characterization of materials’ eluate samples aiming to assess the possible environmental risk of the construction materials, namely of incorporating non-conventional raw materials in concrete, and contributing to achieve construction sustainability.

Porosity Evaluation of Alternative Materials Based on Portland Cement

2014 ◽  
Vol 1000 ◽  
pp. 314-317 ◽  
Author(s):  
Ladislav Pařízek ◽  
Eva Bartoníčková ◽  
Vlastimil Bílek Jr. ◽  
Jiří Kratochvíl
Keyword(s):  
Fly Ash ◽  
Portland Cement ◽  
Coal Combustion ◽  
Mercury Intrusion Porosimetry ◽  
Raw Materials ◽  
High Energy ◽  
Energy Requirements ◽  
Mercury Intrusion ◽  
Secondary Raw Materials ◽  
Alternative Materials

High energy requirements and the resulting economic demands due to the production of Portland cement leads to tendency to replace a portion of cement with secondary raw materials or to use other alternative binders. Among the commonly used cements replacements is currently fly ash which is produced during the coal combustion. In this paper the influence of cement/ash ratio in a paste on paste’s porosity is investigated using mercury intrusion porosimetry.

Application Research of Orthogonal Analysis for Components Selection of Heat-Resistant Concrete

2014 ◽  
Vol 1015 ◽  
pp. 72-76
Author(s):  
Xing Wei Xu ◽  
Ji Yao
Keyword(s):  
Raw Materials ◽  
Engineering Application ◽  
Application Research ◽  
Range Analysis ◽  
Heat Resistant ◽  
Technical Requirements ◽  
Orthogonal Analysis ◽  
The Cost ◽  
A Company ◽  
Selection Of

Combined with the heat-resistant concrete needed for a company combustor, based on the availability of local raw materials, the orthogonal test was used, then by the variance analysis and range analysis, the components of the heat-resistant concrete which could meet the technical requirements of the project were selected. Engineering application results showed: the components of the concrete could meet technical indicators for the engineering application, and effectively reduced the cost of production of heat-resistant concrete.

Study on Long Term Performance of Concrete of Slag-Alkali Higher Calcium Fly Ash

2006 ◽  
Vol 302-303 ◽  
pp. 98-104
Author(s):  
Ming Tang ◽  
Xiao Li
Keyword(s):  
Fly Ash ◽  
Orthogonal Design ◽  
Concrete Specimen ◽  
Mixture Ratio ◽  
Dispersion Degree ◽  
Set Up ◽  
Long Term Performance ◽  
Term Performance ◽  
Mixture Ratio Design

The slag-alkali is used to activate the activity of higher calsium fly ash. By the designs of the mixture ratio and the quadratic regression orthogonal design, the best combination is sought out. Several mixture factors which affect the rule of the concrete material properties and long term performance are researched. The mathematic models which are set up by the mixture ratio design with the quadralic regression orthogonal design can be effective. The precision is high. The strength of the concrete of slag-alkali fly ash was still increasing after 8 year. The dispersion degree of those specimens is small. The SEM photo of cracked specimen and early concrete specimen shows the surface of fly ash in 7 days concrete is slick and that in 8 years old specimen has been enwrapped tightly by much hydrate plant.

An Environmentally Sound Usage of both Coal Mining Residue and Sludge

2011 ◽  
Vol 183-185 ◽  
pp. 595-599 ◽  
Author(s):  
Kui Mei Qian ◽  
Li Zhang ◽  
Li Ping Wang
Keyword(s):  
Fly Ash ◽  
Arbuscular Mycorrhiza ◽  
Coal Mining ◽  
Experimental Research ◽  
Toxic Element ◽  
Coal Gangue ◽  
Mixture Ratio ◽  
Arbuscular Mycorrhiza Fungi ◽  
Environmentally Sound ◽  
Wasteland Reclamation

This study reported the test done on coal gangue-fly ash-sludge mixture for mine wasteland reclamation in pot experiments. According to the characteristic of coal gangue, fly ash and sludge, they were mixed as the complex substrate for reclamation of mine wasteland; meanwhile, arbuscular mycorrhiza fungi (AMF) was also introduced to the reclamation of mine wasteland. The experimental research of the complex substrate and AMF in mine wasteland reclamation was conducted. The results indicated that coal gangue-fly ash-sludge mixture ratio studies revealed that 2: 6: 2 fly ash-coal gangue-sludge mixtures was the optimum mixture ratio that minimized toxic element and provided sufficient nutrients. It resulted that appropriate ratio of the three composite can effectively promote the reclamation, and increase the nutrients absorption of plants, providing a reference for ecological utilization of coal gangue, and fly ash and sludge. In addition, inoculation with AMF in the presence of sludge in mining reclamation was essential for the promotion of plant absorption of nutrients.

Preparation Experiment and Engineering Application of High Performance Concrete of Freezing Shaft in Deep Alluvium

2014 ◽  
Vol 584-586 ◽  
pp. 1407-1411
Author(s):  
Zhi Shu Yao ◽  
Zhen Xu ◽  
Hai Qing Song
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Raw Materials ◽  
Engineering Application ◽  
High Strength ◽  
Engineering Practice ◽  
Mixture Ratio ◽  
Curing Conditions ◽  
Remarkable Effect ◽  
Shaft Lining

According to the special construction environment and curing conditions of the freezing shaft inner and outer shaft lining in deep alluvium, first,configuration principle of high strength high performance concrete of freezing shaft in deep alluvium is proposed; Then raw materials are selected according to the preparation approach, and preparation experimental study of high strength high performance concrete is conducted with C60, C65, C70and C75 , and the optimum mixture ratio is obtained, and applied to the engineering practice, achieving remarkable effect.

scholarly journals PENGARUH PENAMBAHAN LIMBAH PLASTIK JENIS THERMOSETTING TERHADAP MUTU BATA RINGAN (HEBEL)

2020 ◽  
Vol 25 (2) ◽  
pp. 136
Author(s):  
Supriyadi Supriyadi ◽  
Kusdiyono Kusdiyono ◽  
Herry Ludiro Wahyono ◽  
Marchus Budi Utomo ◽  
Imam Nurhadi
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Portland Cement ◽  
Plastic Waste ◽  
Short Term ◽  
Mixture Ratio ◽  
Plastic Bags ◽  
Long Run ◽  
The City ◽  
Average Compressive Strength

<p>At this time, plastic is a material that is needed by the wider community and its impact is also extraordinary after the plastic is used in everyday life which can cause serious problems if the management is not done properly. The problem of plastic waste does not only occur in the city of Semarang, but also in other cities, so that the Ministry of Environment and Forestry to impose a program to use paid plastic bags in the short term. But this is only to deal with problems in the short term. In the long run, it will not solve the problem of "plastic waste", because the policy actually encourages people to buy plastic which, of course, will add a new burden on the community to buy it. The results showed that the compressive strength of light brick with the model / type of BN s.d. B10.0 with 10 variations of the mixture of the addition of plastic waste starting from (1.0 to 10.0)% to the weight of Portland Cement (PC) there is a decrease in the average compressive strength. The lowest was the addition of 10.0% plastic waste with an average compressive strength of 9.88 kg / cm². The regression equation obtained Y = 0.042 X ² - 1.177 X + 18.84 with a correlation value R ² = 0.934, meaning that the addition of plastic waste ranging from (1.0 to 10.0)% of the weight of Portland Cement (PC) has the effect of "very strong "against the compressive strength. So we can get a picture that by adding the addition of plastic waste affects the compressive strength decreases. So that it can be investigated with other compositions by adding Fly Ash and sand made with a mixture ratio of 1 PC: 2 Aggregate (Sand and Fly Ash), with the hope that this Fly Ash waste can also be used for lightweight brick building elements</p>

Recycling MSWI bottom and fly ash as raw materials for Portland cement

2008 ◽  
Vol 28 (7) ◽  
pp. 1113-1118 ◽  
Author(s):  
Jill R. Pan ◽  
Chihpin Huang ◽  
Jung-Jen Kuo ◽  
Sheng-Huan Lin
Keyword(s):  
Fly Ash ◽  
Portland Cement ◽  
Raw Materials

Experimental Study on Quality Control of Moderate-Strength Commercial Concrete

2012 ◽  
Vol 174-177 ◽  
pp. 460-463
Author(s):  
Jing Sun ◽  
Jing Shun Yuan ◽  
Xiao Hong Cong ◽  
Hong Bo Liu
Keyword(s):  
Experimental Study ◽  
Quality Control ◽  
Fly Ash ◽  
Raw Materials ◽  
Cold Climate ◽  
Raw Material ◽  
Mixture Ratio ◽  
Low Costs ◽  
The Impact ◽  
Naphthalene Series

For the quality control of commercial concrete, it is important to choose correct raw- material and mixture ratio. C40 and C50 concrete were prepared in dry and cold climate environment, using local raw materials and a large amount of fly ash. Specific researches were made about different kinds and dosage of superplasticizers on the slump of concrete, slump loss and the intensity of the impact. The results show that naphthalene series superplasticizer JK-2 and 30% of fly ash can ensure that slump of the mixture concrete reach more than 180mm, slump loss is less than 30mm in an hour, strength of hardened paste will not be reduced, and concrete can be prepared with low costs.

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