Abstract
Magnesium potassium phosphate cement (MKPC) is an excellent rapid repair material for concrete, and many mineral admixtures have been applied to promote its performance. This study focuses on the quantitative characterization of the physical and chemical contributions of granulated blast-furnace slag with various finenesses to the performance development of MKPC. It was found that the addition of slag could increase the setting time, which is mainly due to the dilution of cement. Fine slag tends to decrease the fluidity of MKPC mortar. The physical contributions of ordinary and ultrafine slag to the early performance of MKPC mortar are 23% and 30%, while the chemical contributions are only 6%~10%. At late ages, the physical contribution is less than 10% and the chemical contribution of slag is even slightly negative. The addition of slag is beneficial to the compact packing of MKPC, which is the main reason for the physical contribution. Slag could react in the MKPC system, and increasing the fineness significantly promotes the reaction kinetics.
Highlights
Magnesium potassium phosphate cement (MKPC) has been widely used as a rapid repair material for concrete structures due to its excellent bond strength [1,2,3], high early performance [4] and high volume stability [5]
Some solid wastes with high FeO content were found to be beneficial to the early property development of MKPC with a constant M/P ratio
One of the main chemical compounds of most solid waste solid wastes with high FeO content were found to be beneficial to the early property development of MKPC with a constant M/P ratio
Summary
Magnesium potassium phosphate cement (MKPC) has been widely used as a rapid repair material for concrete structures due to its excellent bond strength [1,2,3], high early performance [4] and high volume stability [5]. The reaction mechanism of Ca-based, Al-based, Fe-based and Zn-based chemically bonded phosphate ceramics [15] provided valuable guidance for the modification of MKPC with various mineral admixtures. Mineral admixtures with high CaO content (e.g., wollastonite) have been proven to be beneficial to the properties of MKPC due to the formation of calcium phosphate [16,17]. Some solid wastes with high FeO content were found to be beneficial to the early property development of MKPC with a constant M/P ratio. One of the main chemical compounds of most solid waste solid wastes with high FeO content were found to be beneficial to the early property development of MKPC with a constant M/P ratio. BseaerfcfhecotinveMinKiPmCpsromvoindgiftihede rbeyacutilvtritayfionfesslalagg[3is4]q. uTihtee lhimydirteadtio. n characterization and propeIrntieths iosf sutlutrdayfi,ntehselaegffbelcetndoefdthcemfiennetnheasvseobfeesnlawg iodnelythreepporrotepder[t3i5e–s37o]f. bHloenwdeevder,MKPC rwesaesarqcuhaonntiMtaKtivPeClsymchodarifiaecdtebriyzuedlt.raTfihnee csolangtrisibquutiitoenlismoitfesdl.ag to the mechanical properties due Itno tthhies scthuedmy,itchael ereffaeccttioonf thane dfinpehnyessiscoafl selfafgecotnwthereepcroaplceurltaietsedo.f TblheendinedfluMeKncPeCof slag wfinasenqeusasnotintatthiveewlyocrhkaarbaicltietryizoefdf.reTshheMcoKntPrCibumtioorntsarowf salasgatlosothinevmesetcihgaanteicda.l Bpyroppaerrttiicelse pack‐ dinuge stiomthuelacthioenm,iicsaoltrheearcmtioanl caanldorpimhyestircyalteefsfteicntgw, BerSeEc/aElDcuSlamteadp. pTihnegiannfldueanqcueeoofusslasgolution fiipnnrgoenpsieemsrstuyolanmtitoehnaes,wuisrooertmkhaeebrnmiltia,tylthcoaeflpofrrheisymhseiMctrayKl PatenCsdtmincoghr,etBamSriEwc/aaElsmDaSlescomhiaanpnvpeisisnmtiggsaaotnefdds.laaBqgyuoeponaurttshicseloeplupetraifcooknr-mance pdreovpeelrotpymmeenastuorfemMeKnPt,Cthwe pehreysaicnaallaynzdedc.hemical mechanisms of slag on the performance development of MKPC were analyzed
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