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Experiment number: 9 Experiment name: Particle charge test. Aim of experiment: To determine the particle charge of a bitumen emulsion. Relevant codes: IS 8887: 2004 !itumen emulsion for roads "#ationic t$pe% specification. Relevance and importance: This test is performed to ascertain the particle charge of the
bitumen emulsion. &ggregates and sand particles used in the construction ha'e an inherent positi'e or negati'e charge c harge and it is important to choose the bitumen t$pe accordingl$ so that proper bonding bet(een the aggregate and bitumen bitumen is achie'ed. Test description: !$ using a )2 'olt batter$ ammeter t(o metal plates and rheostat a circuit
is formed. *00 ml of bitumen emulsion is ta+en in a bea+er and the t(o electrodes are inser inserte ted. d. &fter fter ,0 min min of curre current nt flo( flo( thro throug ugh h the the sampl sample e the the catho cathode de and and anod anodee is e-amined. Apparatus required:
1. 2. 3. 4. *.
#urrent source a )2 ' batter$. heostat 2000 ohm capacit$. capaci t$. &mmeter 0.) ampere capacit$. capacit $. Stainl Stainless ess steel steel plat plates es t(o t(o 2* mm mm - 7* 7* mm. mm. /lass /lass conta containe iner r *00 ml capa capacit$ cit$..
Procedure: This test is carried out in the follo(ing steps:
). Sufficient Sufficient uantit$ uantit$ of representa representati'e ti'e sample sample of bitumen bitumen emulsion emulsion is poured poured in to the glass container. 2. T(o T(o steel plates plates (ere inserted inserted in the the sample sample to a depth depth of 2* mm mm and the anode anode and and cathode (ere mar+ed. ,. & circuit circuit is formed formed (ith the t(o t(o plates )2 )2 ' batter$ batter$ ammeter ammeter rheostat rheostat and s(itch. s(itch. 4. The s(itch s(itch is closed closed to complete complete the the circuit and and the rheostat rheostat is ad1usted ad1usted so that that at least *. . 7. 8.
4 m& current flo(s through the circuit. #urrent #urrent is allo(ed allo(ed to flo( thro( the the circuit circuit for ,0 min min b$ closing closing the the s(itch. s(itch. The circuit circuit is opened opened after after ,0 min and and the the plates plates are remo'ed. remo'ed. The plates are (ash (ash (ith (ith distilled distilled (ater if necessar$ necessar$.. !oth electrodes electrodes are are e-amined e-amined for for bitumen bitumen la$er deposit deposition. ion.
