Magnesium potassium phosphate cement paste: Degree of reaction, porosity and pore structure

Ma, Hongyan (author) / Xu, Biwan (author) / Li, Zongjin (author)

Cement and Concrete Research ; 65 ; 96-104

2014-07-18

9 pages

0008-8846

https://doi.org/10.1016/j.cemconres.2014.07.012

Article (Journal)

Electronic Resource

English

ADP , ammonium dihydrogen phosphate , COV , coefficient of variation , DTG , differential thermogravimetric analysis , H , water , KDP , potassium dihydrogen phosphate , KMP , potassium metaphosphate , M , magnesia , MAP , magnesium ammonium phosphate hexahydrate, MgNH<inf>4</inf>PO<inf>4</inf>·6H<inf>2</inf>O , MAPC , magnesium ammonium phosphate cement , MIP , mercury intrusion porosimetry , MKP , magnesium potassium phosphate hexahydrate, MgKPO<inf>4</inf>·6H<inf>2</inf>O , MKPC , magnesium potassium phosphate cement , MPC , magnesia–phosphate cement , REV , representative elementary volume , TGA , thermogravimetric analysis , XRD , X-ray diffraction , <italic>L</italic> <inf><<hsp></hsp>200</inf> , weight loss below 200<hsp></hsp>°C , <italic>L</italic> <inf>><hsp></hsp>200</inf> , weight loss above 200<hsp></hsp>°C , <italic>M</italic>/<italic>P</italic> , magnesia-to-phosphate molar ratio , <italic>M<inf>i</inf></italic> , molar mass of matter <italic>i</italic>, where <italic>i</italic> can be H, KDP, KMP, M, or MKP , <italic>m<inf>KDP</inf></italic> , initial weight of KDP before reaction , <italic>m</italic> <inf><italic>KDP</italic></inf> ^{<italic>un</italic>} , weight of unreacted KDP , <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mover><mi>m</mi> <mo>˜</mo></mover> <mi>M</mi></msub></math> , a mass parameter which is defined as <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mover><mi>m</mi> <mo>˜</mo></mover> <mi>M</mi></msub> <mo>=</mo> <mfrac><mrow><msub><mi>M</mi> <mi>M</mi></msub> <mo>⋅</mo> <mi>M</mi> <mo>/</mo> <mi>P</mi></mrow> <msub><mi>η</mi> <mi>M</mi></msub></mfrac></math> , <italic>R</italic> <inf>600</inf> , remaining weight of MKPC paste when heated to 600<hsp></hsp>°C , <italic>R<inf>KMP</inf></italic> , weight component of <italic>R</italic> <inf>600</inf> due to KMP , <italic>R<inf>M</inf></italic> , weight component of <italic>R</italic> <inf>600</inf> due to magnesia , <italic>v<inf>H</inf></italic> , volume of remaining bulk water in the REV , <italic>V<inf>i</inf></italic> , molar volume of matter <italic>i</italic>, where <italic>i</italic> can be H, KDP, M, or MKP , <italic>v<inf>IP</inf></italic> , volume of inner reaction products , <italic>v</italic> <inf><italic>j</italic></inf> ^{<italic>i</italic>} , initial volume of matter <italic>j</italic> in the REV, where <italic>j</italic> can be H, KDP, or M , <italic>v</italic> <inf><italic>j</italic></inf> ^{<italic>r</italic>} , reacted volume of matter <italic>j</italic> in the REV, where <italic>j</italic> can be KDP or M , <italic>v<inf>OP</inf></italic> , volume of outer reaction products , <italic>W</italic>/<italic>C</italic> , water-to-cement mass ratio , <italic>α<inf>KDP</inf></italic> , degree of reaction of KDP , <italic>α<inf>M</inf></italic> , degree of reaction of magnesia , <italic>γ</italic> , volume of reaction products formed when 1 unit volume of magnesia reacted , <italic>γ<inf>H</inf></italic> , volume of water consumed when 1 unit volume of magnesia reacted , <italic>η<inf>M</inf></italic> , purity of the dead burnt magnesia , <italic>ρ<inf>i</inf></italic> , density of matter <italic>i</italic>, where <italic>i</italic> can be H, KDP, M, or MKP , <italic>ϕ</italic> , porosity , Chemically bonded ceramics (D) , Reaction (A) , Thermal analysis (B) , Microstructure (B) , Pore size distribution (B)