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Zhang Zhen-min - One of the best experts on this subject based on the ideXlab platform.

  • Research on Performance of High-titanium Slag for Cement Admixture
    Bulletin of the Chinese ceramic society, 2014
    Co-Authors: Zhang Zhen-min
    Abstract:

    This paper analyzes the high-titanium slag mineral composition,activity coefficient,and discusses the grinding fineness of high-titanium slag affects the Cement setting time,standard consistency water,stability,etc.,also analyzes the effect of different grinding aids,as well as the impact of hightitanium slag on Cement strength and hydration products,obtains the experimental basis for high-titanium slag used as Cement Admixture. By the way of single-doped and composite-doped,it obtains the different content and ratios of composite Portland Cement and ordinary Portland Cement by comparing. The results show that high-titanium slag will not adversely affect the hydration products of Cement,and grinding smaller high-titanium slag is more conducive to parcels effect that the Cement hydration products produced,making the structure more closely,thereby increasing the strength of Cement; under the condition of effective grinding aid,it is incorporated 30% of high-titanium slag,also mixed with fly ash and blast furnace slag,Admixtures up to 40%,which can meet P ·C 32. 5R Cement production level; under the condition of effective grinding aid,it is incorporated 10% of high-titanium slag,also mixed with fly ash and blast furnace slag,Admixtures up to 20%,which can meet P·O 42. 5R Cement production level.

Li Chen - One of the best experts on this subject based on the ideXlab platform.

  • stabilization treatment of soft subgrade soil by sewage sludge ash and Cement
    Journal of Hazardous Materials, 2009
    Co-Authors: Li Chen
    Abstract:

    Abstract In this study, incinerated sewage sludge ash (ISSA) is mixed with Cement in a fixed ratio of 4:1 for use as a stabilizer to improve the strength of soft, cohesive, subgrade soil. Five different ratios (in wt%: 0%, 2%, 4%, 8%, and 16%) of ISSA/Cement Admixture are mixed with cohesive soil to make soil samples. In order to understand the influences of Admixtures on the soil properties, tests of the pH value, Atterberg limits, compaction, California bearing ratio (CBR), unconfined compressive strength, and triaxial compression were performed on those samples. The study shows that the unconfined compressive strength of specimens with the ISSA/Cement addition was improved to approximately 3–7 times better than that of the untreated soil; furthermore, the swelling behavior was also effectively reduced as much as 10–60% for those samples. In some samples, the ISSA/Cement additive improved the CBR values by up to 30 times that of untreated soil. This suggests that ISSA/Cement has many potential applications in the field of geotechnical engineering.

Li Dong-xu - One of the best experts on this subject based on the ideXlab platform.

  • Study on Calcined Shale as Cement Admixture
    Bulletin of the Chinese ceramic society, 2010
    Co-Authors: Li Dong-xu
    Abstract:

    The temperatures of calcined shale are determined by differential scanning calorimetry(DSC).The pozzolanic activity of different calcined shales are investigated by the means of pozzolanic activiy test.Through XRD and SEM analyses,it is concluded that the Cementitious activity of the calcined shales depend on the heat decomposition of shales.The results show that,the shales have high pozzolanic activity at calcined temperture 800 ℃.The addition of 30wt% ash fly and shale which are calcined 30 minutes in the temperture 800 ℃ can product P.C 42.5 Cement.

Wang Zhi-hua - One of the best experts on this subject based on the ideXlab platform.

  • Study of Oil Shale Ash as Cement Admixture
    Bulletin of the Chinese ceramic society, 2009
    Co-Authors: Wang Zhi-hua
    Abstract:

    It was confirmed that the oil shale ash met the requirement of the standards of pozzuolanic Admixture and could be as Cement filler.Nine Cement samples,which were consisted of different mixing amount of oil shale ash,clinker and gypsum,were tested to obtain the strength value according to the National Standard and the Cement blocks were analysed by XRD.The results showed that the Cement strength is reduced as the increased amount of oil shale ash and has a large decreasing amount in the previous period.Incorporation of a large amount of oil shale ash,ettringite is detected by XRD which is attributed to lacking of C3A mineral.While the mixing amount of oil shale ash is 5-10%,the Cement strength is equal to the clinker strength;While the mixing amount is 15-20%,the strength is close to the clinker strength;While the mixing amount is more than 20%,the strength is significantly depressed.

Chiara F Ferraris - One of the best experts on this subject based on the ideXlab platform.

  • rheology and setting of high volume fly ash mixtures
    Cement & Concrete Composites, 2010
    Co-Authors: Dale P Bentz, Chiara F Ferraris
    Abstract:

    While high volume fly ash (HVFA) concretes can be designed and produced to meet 28-d strength requirements and often even exceed the durability performance of conventional concretes, a persistent problem is the potentially long delay in setting time that produces concurrently long delays in finishing the concrete in the field. Previous isothermal calorimetry studies on two different powder additions, namely calcium hydroxide and a rapid set Cement, have shown that these powders can mitigate excessive retardation of the hydration reactions. In this paper, rheological measurements and conventional Vicat setting time studies are conducted to verify that these powder additions do indeed reduce setting times in paste systems based on both ASTM Class C and ASTM Class F fly ashes. The reductions depend on the class of fly ash and suggest that trial mixtures would be a necessity to apply these technologies to each specific fly ash/Cement/Admixture combination being employed in the field. Potentially, for such screening studies, the rheological measurement of yield stress may provide a faster indication of setting (and finishability) than conventional Vicat needle penetration measurements on pastes.