Effect of the combination of fly ash and silica fume on water resistance of Magnesium–Potassium Phosphate Cement

Zheng, Dengdeng; Ji, Tao; Wang, Can-Qiang; Sun, Chun‐Jing; Lin, Xiaoyan; Hossain, Khandaker M. Anwar

doi:10.1016/j.conbuildmat.2015.12.085

Cited by 171 publications

(49 citation statements)

References 6 publications

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“…Acid activation is known to be used for the synthesis of magnesium phosphate cements [11][12][13][14][15][16][17]. Cements produced by this method can lead to compressive strengths of about 20 MPa for specimens aged less than 7 days and 70 MPa for specimens aged for 28 days [18][19][20]. These cements are also known as chemically bonded ceramic phosphates [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Amorphous phase of volcanic ash and microstructure of cement product obtained from phosphoric acid activation

et al. 2020

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Alkaline activation of volcanic ash using Na 2 SiO 3 as activator showed its limits because of their low reactivity, nevertheless, phosphoric acid activation using H 3 PO 4 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 SiO 2 , Al 2 O 3 , Fe 2 O 3 , 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.

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Section: Introductionmentioning

confidence: 99%

Amorphous phase of volcanic ash and microstructure of cement product obtained from phosphoric acid activation

et al. 2020

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“…Low-pH cementitious materials are commonly addressed from different approaches depending on the type of source material, such as calcium silicate, calcium aluminate, or magnesium-phosphate composites (MPCs) [3]. MPC, in particular, has become one of the hot topics in civil engineering materials due to its advantageous properties, including near-neutral pH, rapid setting, low water demand, low drying shrinkage, high-strength gain at an early age, good durability, and high bonding strength [4][5][6]. The near-neutral pH and good durability allow MPCs to be recognized as a special cementitious material applicable for vegetation resources such as artificial soils and lightweight aggregate particles for soil protections.…”

Section: Introductionmentioning

confidence: 99%

Tests on magnesium potassium phosphate composite mortars with different water-to-binder ratios and molar ratios of magnesium-to-phosphate

Lee

Yoon

Yang

2017

Construction and Building Materials

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“…Li et al [12] also indicated that the addition of FA has a positive effect on the compressive strength but a negative effect on the flexural strength and tensile strength of the MKPC paste. Zheng et al [13] demonstrated that the combination of 15 wt.% FA and 10 wt.% silica fumes led to a higher density and large-age compressive strength of the MKPC paste. In addition, Chen et al [14] indicated that the addition of 50% FA, 10% silica fume and 2% re-dispersible latex powder could significantly improve the mechanical strength and water resistance of the MKPC paste.…”

Section: Introductionmentioning

confidence: 99%

Effects of graphene oxide on the properties and microstructures of the magnesium potassium phosphate cement paste

Hou

et al. 2016

Construction and Building Materials

109

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Effect of the combination of fly ash and silica fume on water resistance of Magnesium–Potassium Phosphate Cement

Cited by 171 publications

References 6 publications

Amorphous phase of volcanic ash and microstructure of cement product obtained from phosphoric acid activation

Amorphous phase of volcanic ash and microstructure of cement product obtained from phosphoric acid activation

Tests on magnesium potassium phosphate composite mortars with different water-to-binder ratios and molar ratios of magnesium-to-phosphate

Effects of graphene oxide on the properties and microstructures of the magnesium potassium phosphate cement paste

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