The Experts below are selected from a list of 90 Experts worldwide ranked by ideXlab platform

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

  • low carbon Cement clinker and preparation method and application thereof
    2016
    Co-Authors: Liu Yanjun, Zheng Yongchao, Zheng Yunsheng, Chen Yu
    Abstract:

    The invention discloses low-carbon Cement clinker and a preparation method and application thereof.Raw materials for preparing the Cement clinker are a silicon-aluminum containing material, limestone and industrial tailings, and the silicon-aluminum containing material is one of or a mixture of low-grade alumina, fly ash, red mud and gangue.The preparation method includes: well mixing the raw materials, and grinding, wherein a requirement on grain diameter after grinding is that screen residue of a 0.08-mm square-hole screen is less than 15%; calcining the raw materials after being ground at calcining temperature of 1150-1350 DEG C for 10-40 min, and cooling to obtain the low-carbon Cement clinker.Content of high-activity beta type dicalcium silicate is greater than or equal to 50%, content of calcium sulfosilicate is 5-15%, and content of calcium sulfoaluminate is 15-25%.A finished Cement Product can be prepared by adding 0.01-10% of gypsum and 0.01-10% of limestone into the Cement clinker.According to existing national detection standards, standard mortar of the Cement is higher than 30 MPa in 3-day compressive strength and is 60+/-5 MPa in 28-day compressive strength.

Mingyu Jiang - One of the best experts on this subject based on the ideXlab platform.

  • flexible Cement component flexible Cement Product and preparation method and use thereof
    2010
    Co-Authors: Qian Liu, Jiacui Yang, Junfu Yang, Mingyu Jiang
    Abstract:

    The invention discloses a flexible Cement component, a flexible Cement Product and a preparation method and use thereof. The flexible Cement component consists of the following components in part by mass: 10 to 50 parts of Cement-coagulation adhesive, 30 to 75 parts of flyash, 3 to 5 parts of siliceous dust, 5 to 35 parts of adhesive, 0.3 to 3 parts of fiber, 20 to 25 parts of water, 3 to 5 parts of auxiliary material, 0.3 to 1.3 parts of water reducer and 0.2 to 1.2 parts of additive. The flexible Cement Product has multiple purposes, can be applied to preparing parts of arched top surface layers and surface layers on side wall bends of tunnels to save the materials and labor and accelerate the construction process. The flexible Cement Product is used for preparing external wall decoration plate surface layers with various patterns, can be compounded on a heat insulation board to lighten the weight of the conventional heat insulation board in the country and increase the sense of beauty, and is also used as a ceiling with attractive appearance and light weight. The flexible Cement component also can be used for manufacturing waterproof materials, functional Cement boards and the like.

Martin Cyr - One of the best experts on this subject based on the ideXlab platform.

  • Amorphous phase of volcanic ash and microstructure of Cement Product obtained from phosphoric acid activation
    SN Applied Sciences, 2020
    Co-Authors: Benjamin Igor Djon Li Ndjock, Jean Baenla, Jean Baptiste Bike Mbah, Antoine Elimbi, Martin Cyr
    Abstract:

    Alkaline activation of volcanic ash using Na2SiO3 as activator showed its limits because of their low reactivity, nevertheless, phosphoric acid activation using H3PO4 as activator can offer a great possibility of utilization of the latter aluminosilicate. The present study aims to determine the chemical composition of amorphous phase of volcanic ash and examine through the microstructure of the obtained Cement-based phosphoric acid activation the relation between silicon and phosphorus atoms. Chemical composition of amorphous phase was determined by dissolution with NaOH and HCl. Cement fresh paste was subjected to isothermal calorimetry and temperature variation. Meanwhile, the hardened paste was characterized by X-ray diffraction, thermogravimetry analysis, scanning electron microscopy, energy dispersive spectrometry and Fourier transform infrared spectroscopy in order to study the microstructure. Also, the Cement Product was submitted to compressive strength test. The results obtained showed that, the amorphous phase of volcanic ash contain SiO2, Al2O3, Fe2O3, MgO and CaO oxides. This study allowed to understand the fact that phosphoric acid activation of volcanic ash at ambient temperature is an exothermic reaction and its described as a dissolution/precipitation process. Also, the obtained Product was hydrated. Compressive strength of the Cement Product aged 1 and 28 days was respectively 20.6 and 30.5 MPa. Based on SEM/EDS analysis, silicon are partially replaced by phosphorus atoms and the Product is made of –Si–O–Al–O–P–O–phospho-sialate network. Phosphoric acid activation is a promising route of valorisation of volcanic ash.

Yuyang Zhou - One of the best experts on this subject based on the ideXlab platform.

  • Addition of large amount of municipal sewage sludge as raw material in Cement clinker Production.
    Environmental Science and Pollution Research, 2017
    Co-Authors: Minrui Huang, Na Li, Dongsheng Shen, Huajun Feng, Yuyang Zhou
    Abstract:

    Two addition modes were used to explore the maximum addition of municipal sewage sludge as a raw material in Cement clinker Production. The clinker and Cement Product quality were determined by chemical analysis, Cement quality testing, characterization of the clinker crystalline phases, and leaching tests. Municipal sewage sludge addition in the raw mix could be up to 30% based on the Cement clinker moduli, and the Cement quality met the P.O 42.5 Cement standard (GB 175-2007). The amount of municipal sewage sludge added based on the direct addition mode should be less than 15% because of an insufficient early-term Cement strength (third day). The leaching concentrations of heavy metals in all Cements were below the threshold (GB 30760-2014) using the latest leaching procedure (GB 30810-2014). The municipal sewage sludge could be used with a high addition (30%) in the raw mix as a raw material in Cement clinker Production.

Cyr Martin - One of the best experts on this subject based on the ideXlab platform.

  • Amorphous phase of volcanic ash and microstructure of Cement Product obtained from phosphoric acid activation
    'Springer Science and Business Media LLC', 2020
    Co-Authors: Djon Li Ndjock, Benjamin Igor, Baenla Jean, Mbah, Jean Baptiste Bike, Elimbi Antoine, Cyr Martin
    Abstract:

    International audienceAlkaline activation of volcanic ash using Na2SiO3 as activator showed its limits because of their low reactivity, nevertheless, phosphoric acid activation using H3PO4 as activator can offer a great possibility of utilization of the latter aluminosilicate. The present study aims to determine the chemical composition of amorphous phase of volcanic ash and examine through the microstructure of the obtained Cement-based phosphoric acid activation the relation between silicon and phosphorus atoms. Chemical composition of amorphous phase was determined by dissolution with NaOH and HCl. Cement fresh paste was subjected to isothermal calorimetry and temperature variation. Meanwhile, the hardened paste was characterized by X-ray diffraction, thermogravimetry analysis, scanning electron microscopy, energy dispersive spectrometry and Fourier transform infrared spectroscopy in order to study the microstructure. Also, the Cement Product was submitted to compressive strength test. The results obtained showed that, the amorphous phase of volcanic ash contain SiO2, Al2O3, Fe2O3, MgO and CaO oxides. This study allowed to understand the fact that phosphoric acid activation of volcanic ash at ambient temperature is an exothermic reaction and its described as a dissolution/precipitation process. Also, the obtained Product was hydrated. Compressive strength of the Cement Product aged 1 and 28 days was respectively 20.6 and 30.5 MPa. Based on SEM/EDS analysis, silicon are partially replaced by phosphorus atoms and the Product is made of –Si–O–Al–O–P–O–phospho-sialate network. Phosphoric acid activation is a promising route of valorisation of volcanic ash