1.1rudis materiae
Et cementa adoptat p · ⅱ 52.5 cement (PC) produci by Nanjing Ongeros Cementa Plantae, Hydroxypropyl, PA (II% aqueum, PA), 0 0.05 Missam), 0.05%, 0.05%, 0.05%, 0.05%, 0.05,% 0 0.05: 0.10%, 0.20%, 0,30%, respective; Et denique aggregatum est Vicus harenae cum particula magnitudine 0.212 ~ 0.425 mm.
1.2experimentum modum
1.2.1Materia praeparatio
Mixer Model JJ-V, primo, primo misce HPMC, cementum et harenae aequaliter, deinde addere aqua et misce pro III min (II min at Minimum celeritatem et I min ad altum cum mixtione.
1.2.2Printable perficientur iudicium
In printability de cæmento quod maxime propria ex extruditability et stackability.
Bonum extruditability est ex pro realizing 3D printing, et cæmento quod requiritur ad esse lenis et non angustos in organo in extrusionem processus. Delivery requisitis. Referendo ad GB / T 2419-2005 "determinationem fluiditatem cemento cæmento", quod fluiditatem cæmento quod erat ad sinistram stans ad 0, XX, XL, et LX min erat temptavit a saliendo mensa test.
Bonum Stackaby est clavis ad animadverto 3D printing. Non requiritur quod typis iacuit non collapse vel deforme significantly sub sua pondus et pressura superius iacuit. Et figura retention rate et penetratio resistentia sub sua pondus potest esse ad comprehendendo characterize in stackability de 3D printing cæmento.
In figura retention rate sub sua pondus reflects in gradu deformatio de materia sub sua pondus, quae possunt esse ad aestimare stackability de 3D printing materiae. In altiorem figuram retention rate, minores deformatio cæmento in sua pondus, quod est ad printing. Reference et cassar in cylindrici fingunt diameter et altitudo C mm ariete et vibrate X temporibus, rade superius superficiem et tollat test retentione altitudo est figura retentione elit. Et super modum usus est ad experimentum figura retention rate de cæmento post stans ad 0, XX, XL et LX min respective.
In stackability de 3D printing cæmento directe ad occasum et indurare processus in ipsa materia, ita penetratio resistentia est ad obtinendum rigorem progressionem aut structuram constructione mores cements, secundum materias in stackability. Refer to JGJ LXX - MMIX "Test modum ad basic perficientur de aedificationem cæmento" temptare penetrationem resistentia cæmento.
In addition, a gantry frame printer was used to extrude and print the outline of a single-layer cube with a side length of 200 mm, and the basic printing parameters such as the number of printing layers, the width of the top edge, and the width of the bottom edge were tested. Et excudendi layer crassitiem VIII mm et printer motus celeritas est I D mm / min.
1.2.3Rheologis proprietas temptationis
Et rheological modularis est momenti iudicium parameter ad characterizare deformatio et workability de slurry, quod potest esse praedicere fluxus mores 3D printing caementa slurry. Et apparent viscositas reflects internum friction inter particulas in slurry et potest evaluate resistentiam de slurry ad deformationem fluxus. Et facultatem HPMC ad reflectunt effectum HPMC in extruditability de 3D printing cæmento. Ratio in Mixing Ratio in Tabula II ad parare cement crustulum p-H0, p-h0.10, p-h0.20, p-h0.30, uti a Brookfelt Dvnext cum adapter ad probare suum rheology proprietatibus. In test environment temperatus est (XX ± II) ° C. Pura slurry est pre-sheared ad X s ad 60.0 s-I ad slurry aequaliter distribui, et tunc constiterunt ad X s, et tunc tondendas rate crescit ex 0.1 I ad 60.0 s-I et decrescit ad 0.1 S-I et decrescit ad 0.1 S-I et decrescat ad 0.1 S-I.
Et Bingham exemplar ostensum est in Eq. (I) adhibetur ad linearly fit tondendas accentus-twear rate curvam in stabulo gradu (Shear rate est 10.0 ~ 50.0 s-I).
Τ0 τ0 + μΓ + (I).
ubi τ est tondendas accentus; τ0 est cede accentus; μ est plastic viscositas; γ est tondendas rate.
Cum cementum, secundum materiam est in static statum, in plastic viscositas μ repraesentet gradum difficultas de colloidal ratio defectum, et cede accentus τ0 refers ad minimum accentus requiritur ad slurry ad fluxus ad minimum accentus requiritur ad slurry ad fluere. In materia tantum fluit cum tondendas accentus altior quam τ0 occurs, ita potest esse ad reflectunt influentiam HPMC in Stackability de 3D printing cæmento.
1.2.4Mechanica res test
Referring to GB/T 17671-1999 “Testing method for the strength of cement mortar”, the mortar specimens with different HPMC contents were prepared according to the mixing ratio in Table 2, and their 28-day compressive and flexural strengths were tested.
Non est pertinet vexillum in test methodo de vinculum vires inter stratis 3D printing cæmento. In hoc studium, in scissionem modum usus est in test. In 3D printing cæsar specimen erat sanari pro XXVIII D et interficiam in III partes, nomine A, B, c respectively. , Ut ostensum est in Figura II (a). Et CMT-(IV) CCIV Universal Testing Machina (range XX kno, accuracy classis I, loading rate 0.08 mm / min) ad split defectum subsisto, ut ostensum est in Figura II (b).
Quod interlaminar vinculum vires PB de Specimen est ratione secundum hoc formula:
PB = 2froga = 0.637 fa (II)
ubi F est defectum onus de Specimen; A est area de split superficies specimine.
1.2.5Micromorphology
Et Microscopic morphologia de specimens ad III d fuit cum a Quanta CC scanning Electron Microscopium (Sem) a Fei Company, USA.
Post tempus: Sep, 27-2022