JOURNAL OF ENVIRONMENTAL SCIENCES 36 (2015) Available online at ScienceDirect

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1 Aville online t SieneDiret Preprtion of steel slg porous sound-soring mteril using ol powder s pore former Peng Sun, Zhnheng Guo Stte Key L of Advned Metllurgy, University of Siene nd Tehnology, Beijing , Chin. E-mil: sunpeng@res.org.n ARTICLE INFO Artile history: Reeived 28 Deemer 2014 Revised 12 Mrh 2015 Aepted 20 April 2015 Aville online 3 July 2015 Keywords: Steel slg Porous sound-soring mteril Noise redution oeffiient Apprent porosity Compressive strength ABSTRACT The im of the study ws to prepre porous sound-soring mteril using steel slg nd fly sh s the min rw mteril, with ol powder nd sodium silite used s pore former nd inder respetively. The influene of the experimentl onditions suh s the rtio of fly sh, sintering temperture, sintering time, nd porosity regultion on the performne of the porous sound-soring mteril ws investigted. The results showed tht the speimens prepred y this method hd high sound sorption performne nd good mehnil properties, nd the noise redution oeffiient nd ompressive strength ould reh 0.50 nd 6.5 MP, respetively. The ompressive strength inresed when the dosge of fly sh nd sintering temperture were rised. The noise redution oeffiient deresed with inresing rtio of fly sh nd reduing pore former, nd first inresed nd then deresed with the inrese of sintering temperture nd time. The optimum preprtion onditions for the porous sound-soring mteril were proportion of fly sh of 50% (wt.%), perentge of ol powder of 30% (wt.%), sintering temperture of 1130 C, nd sintering time of 6.0 hr, whih were determined y nlyzing the properties of the sound-soring mteril The Reserh Center for Eo-Environmentl Sienes, Chinese Ademy of Sienes. Pulished y Elsevier B.V. Introdution Steel slg is y-produt of steel prodution tht mkes up out 15% of steel output (Guo et l., 2011), nd round 60 million dditionl tons of steel slg in Chin is dishrged per yer. The utiliztion rtio of steel slg in Chin is less thn 22%, nd steel slg dumps oupy lrge res of lnd nd result in mny serious environmentl prolems. Therefore, it is of gret onern tht new, effiient wy is explored to improve the utiliztion rtio of steel slg. The min hemil omposition of steel slg inludes lium oxide (CO), silion dioxide (SiO 2 ), luminum oxide (Al 2 O 3 ), iron sesquioxide (Fe 2 O 3 ), mgnesium oxide (MgO), et., with the first four oxides ounting for more thn 80% of steel slg ontent. The ommon minerls in steel slg re dilium silite (C 2 S), trilium silite (C 3 S), dilium ferrite (C 2 F), n RO phse (CO FeO MnO MgO solid solution) nd free CO, s well s vrying onentrtions of lium hydroxide (C(OH) 2 ), trilium luminte (C 3 A), tetrlium luminoferrite (C 4 AF), perilse, lium hromite (C(CrO 2 ) 2 ), metl iron, et. (Wng nd Ye, 1981; Ouyng et l., 1991; Geiseler, 1996; Alyrk nd Ysr, 2005; Xu et l., 2000; Wligor et l., 2010). Beuse steel slg hs high silite omposition, steel slg not only hs ertin ementitious properties ut lso meets the hemil omposition requirements for the preprtion of glss-ermi nd ermis. Steel slg n e used s n dditive for ement nd onrete (Shi, 2004; Akin nd Yilmz, 2002; Dong et l., 2011; Feng nd Corresponding uthor. E-mil: zguo@metll.ust.edu.n (Zhnheng Guo) / 2015 The Reserh Center for Eo-Environmentl Sienes, Chinese Ademy of Sienes. Pulished y Elsevier B.V.

2 68 JOURNAL OF ENVIRONMENTAL SCIENCES 36 (2015) Li, 2010; Shen et l., 2009; Poh et l., 2006) nd used for prepring slg glss ermis, ermis, nd other mterils (Yng et l., 2003; Zho et l., 2011; Yo et l., 2005; Zhng et l., 2008). The use of steel slg in uilding mterils hs eome one of its min pplitions. As the ontent of CO in steel slg is etween 40% nd 60%, silieous mteril needs to e dded to inrese the proportion of silion to lium in the sustrte mteril to improve the ementitious properties, stility, nd sintering properties (Xio, 1996; Xu et l., 2009). Fly sh ontins smll mount of CO, nd SiO 2,Al 2 O 3, nd Fe 2 O 3 ount for more thn 75% of fly sh ontent (Wng et l., 2005, 2014). Consequently, steel slg nd fly sh n omplement eh other in the preprtion of onstrution mterils y the sintering proess. In order to ensure environmentl sfety in the utiliztion of steel slg, dissolution of hevy metl ions nd rdiotive metls in steel slg ws tested y our projet tem memer (Ai, 2014). The results showed tht the lehing of led nd hromium ws fr lower thn the stndrd limits of Identifition Stndrds for Hzrdous Wstes Identifition for Extrtion Toxiity (GB ), nd the internl exposure index (Ir) nd externl exposure index (Ir) were lso less thn the stndrd limits of Limits of Rdionulides in Building Mterils (GB ). Therefore, the utiliztion of steel slg will not use seondry environmentl pollution. Some studies on preprtion of porous sound-soring mteril from industril solid wstes hve een done. The porous ermi or glss fom sound-soring mterils hve een prepred using lst furne slg (He et l., 2010), ol gngue (Zhng et l., 2010; Xio et l., 1999), nd fly sh (Zhng et l., 2011) s the min mteril nd dding foming gent nd other dditives y sintering proess, nd the results showed tht the porous sound-soring mterils hd high porosity ut poor mehnil properties. There hve een few studies on the preprtion of porous sound sorption mteril using steel slg esides those of our group. We hve explored sintering for the preprtion of porous sound sorption mteril (Li et l., 2014) using steel slg prtiles with inder, nd the porous sound-soring mterils were found to hve lrge volume density, poor proessing performne nd non-uniform sintering. In order to otin steel slg porous sound-soring mterils with etter sound sorption nd mehnil properties, this study onduts further reserh on the preprtion of porous sound-soring mteril using steel slg powder y sintering proess on the sis of previous studies. Fly sh (Wng nd Yn, 2011; Zho et l., 2010), ol powder, nd sodium silite were used s modifier, pore former, nd inder, respetively; nd the effet of preprtion onditions on the properties of the steel slg porous sound-soring mteril ws investigted. Intensity (.u.) θ ( ) sh ws low lium nd grde II. The hemil ompositions of steel slg nd fly sh re shown in Tle 1. The ol powder prtile size ws etween 0.1 nd 1.0 mm. The fly sh nd ol powder were supplied y Shougng Group Qin Gng Compny (Chin). Sodium silite with modulus of ws otined from Beijing Jingmin Tongd Trding Co. Ltd. (Chin). Sodium fluosilite, lss AR, ws purhsed from Tinjin Gungfu Fine Chemil Reserh Institute (Chin). Hydrogen peroxide with ontent of 27.5% ws purhsed from Heei Go Chemil Corp (Chin) Speimen preprtion In ordne with the desired rtio of the rw mterils, the steel slg, fly sh nd ol were weighed, nd then mixed together. The mixed mterils were moistened with little wter for 30 min, nd 5% sodium silite ws dded into the ged mterils. The mixture ws then molded fter it ws mixed. The rough lnks were demoulded nd dried for 48 hr. Aording to the sintering proedure shown in Fig. 2, the rough lnks were put into resistne furne nd sintered for hr t 1000, 1050, 1100, 1130, nd 1150 C in ir, respetively. Then steel slg sound-soring mteril smples of mm 30 mm were prepred Chrteriztion of the speimens Lrnite Alite C 3 A The density nd porosity of the speimens were determined y the Arhimedes method using deionized wter s the immersion medium. Mirostruture oservtion nd pore distriution were performed using Minerl Liertion C 2 F Mgnesium iron oxide Fig. 1 X-ry diffrtometer (XRD) ptterns of the steel slg. 1. Mterils nd methods 1.1. Rw mterils Steel slg powder, with prtile size less thn mm, ws otined from Shougng Group Qin Gng Compny (Chin). Its minerlogil phses, whih were determined y powder X-ry diffrtometer (XRD) nlysis, re given in Fig. 1. The fly Tle 1 Chemil ompositions nd ontent of the min mteril (wt.%). Compositions CO Fe 2 O 3 SiO 2 Al 2 O 3 MgO MnO Steel slg Fly sh Compositions P 2 O 5 TiO 2 SO 3 V 2 O 5 K 2 O N 2 O Steel slg Fly sh

3 69 Temperture ( C) \ 2 C/min \ 1 C/min Time (min) Anlyzer (MLA-250, FEI, Hillsoro, Oregon Stte, USA). The min minerl phses of the porous sound-soring mteril were mesured y powder X-ry diffrtometer (XRD, DMAX-RB 12 KW, Rigku Corportion, Akishim-shi, Tokyo, Jpn) t voltge of 40 kv nd urrent of 150 ma with Cu K rdition. The ompressive strength of the speimens ws mesured y n MTS810 miroomputer ontrolled universl mteril testing mhine. The sound-sorption properties of ylindril speimens with dimeters of 100 mm were tested y the stnding-wve tue method, whih is the norml inidene sound-soring determintion. 2. Results nd disussion 2.1. Effet of the dosge of fly sh on sound-soring mteril The effet of fly sh dosge on the struture nd properties of the steel slg porous sound-soring mteril ws investigted t sintering temperture of 1100 C, sintering time of 6.0 hr, nd 10% ol powder. The density, porosity, nd ompressive strength of the speimens re presented in Tle 2. The density of the speimens inresed mrkedly nd rehed 1.53 g/m 3 when the dosge of fly sh inresed from 20% to 50%. However, the pprent porosity of the speimens deresed y 4.2% with the inrese of fly sh dosge. At the sme time the pprent porosity deresed, the ompressive properties of the speimens orrespondingly improved from 1.95 to 5.96 MP. d e \ 3.5 C/min / 2 C/min Fig. 2 Sintering proedure of the steel slg sound-soring mteril. () 1000 C, () 1050 C, () 1100 C (d) 1130 C, nd (e) 1150 C. Tle 2 Effet of the dosge of fly sh on the density, pprent porosity, nd ompressive strength of the speimens. Fly sh (%) Density (g/m 3 ) Apprent porosity (%) Compressive strength (MP) Fig. 3 nd shows the morphology nd distriution of the pores in the steel slg sound-soring mteril. The speimen with 30% fly sh ws reltively loose nd hd muh more numerous nd lrger pores. The speimen with 50% fly sh ws more ompt, nd hd somewht fewer nd smller pores; ut the pores of the speimen with 50% fly sh were etter onneted. Fig. 4 ompres the XRD ptterns of the speimens with 20% fly sh nd 50% fly sh. It ws determined tht four minerl phses were present in the speimens with 20% fly sh inluding gehlenite, kirshsteinite, northite nd smll mount of mgnesium iron oxide, nd three minerl phses were present in the speimens with 50% fly sh, inluding diopside, gehlenite, nd smll mount of ndrdite. It n e found y ompring Fig. 1 with Fig. 4 tht the min minerl phses of C 3 S, C 2 S, C 2 F, et., in the steel slg prtiipted in the sintering retion t high tempertures nd their diffrtion peks disppered, wheres the diffrtion pek of mgnesium iron oxide deresed signifintly. As the mount of fly sh ws inresed, the rtio of lium to silion inresed. The minerl phses of kirshsteinite, northite nd mgnesium iron oxide in the speimens ontinued tking prt in the sintering retion nd their diffrtion peks disppered. The new minerl phses of diopside nd ndrdite formed, nd the diffrtion peks of gehlenite were enhned. These results orded with the results reported in the literture (Zho et l., 2010). Therefore, y dding the dosge of fly sh to inrese the rtio of silion to lium, the sintering properties of the se mteril were improved nd the densifition degree of the speimen ws enhned t the sme sintering temperture nd time. The density of the speimen inresed nd pprent porosity deresed. The ompressive strength of the speimen ws inresed ordingly. Fig. 5 shows the test results for the sound sorption properties of speimens with different dosges of fly sh. The sound sorption of the steel slg porous mterils in the high frequeny rnge ws etter thn tht t low frequeny, with sound-sorption oeffiients of nd , respetively. The sound sorption performne thus initilly inresed nd then deresed slightly with the inrese in the mount of fly sh. The noise redution oeffiients (NRC) were etween 0.35 nd The sintering retion of the porous mterils ws elerted with inresing fly sh ontent in the se mteril. The density, pprent porosity, nd pore size of the porous sound-soring mteril hnged. The perture in prtiulr, whih hs more ovious influene on the sound-sorption properties of mterils, eme finer, nd the pores kept good onnetivity. The NRC of the speimen with 40% fly sh ws up to 0.43, nd tht of the speimen with 50% fly sh slightly deresed to 0.42, wheres the sound sorption of the speimen with 50% fly sh in the low frequeny rnge ws etter thn tht of the speimen with 40% nd other dosges of fly sh Effet of sintering temperture on sound-soring mteril The effet of the sintering temperture on the struture nd properties of the steel slg porous sound-soring mteril ws investigted with sintering time of 7.5 hr, 50% fly sh, nd 20% ol powder. Tle 3 lists the density, porosity, nd ompressive strength of the speimens with different

4 70 J O U RN A L OF E N V I RO N ME N TA L SC IE N CE S 3 6 ( ) d e f Fig. 3 Snning Eletroni Mirosopy (SEM) morphology nd distriution of the pores in the speimens with different rtios of fly sh (: 30% fly sh; : 50% fly sh), different tempertures (: 1100 C; d: 1150 C), nd different sintering times (e: 6.0 hr; f: 9.0 hr). sintering tempertures. The sintering temperture hd signifint impt on the density, pprent porosity, nd ompressive strength of the speimens. As the sintering temperture inresed from 1000 to 1150 C, the density of the speimens inresed shrply nd rehed 1.77 g/m3, nd the pprent porosity of the speimens deresed y 10.8%. Correspondingly, the ompressive strength of the speimens ws rpidly improved from 1.22 to 9.76 MP with the derese of the pprent porosity. As indited in Fig. 3 nd d, the speimens sintered t 1100 C developed porosity; lthough the perture size ws uniform nd the pore shpe ws irregulr, the pores hd etter onnetivity thn those of the speimen sintered t 1150 C. The speimen otined t 1150 C hd fewer pores, whose size ws non-uniform. The pore shpe eme somewht round nd some losed pores were formed, so the densifition of the speimen ws sustntilly ompleted. Fig. 4 shows the XRD ptterns of the speimens prepred t 1050 nd 1150 C. The min minerl phses in the speimens prepred t 1050 C inluded gehlenite, kirshsteinite, mgnesium iron oxide, diopside, ndrdite, nd smll mount of northite. With the inrese of sintering temperture, the diffrtion peks of diopside nd gehlenite were enhned; nd the diffrtion pek of kirshsteinite, ndrdite, mgnesium iron oxide, nd northite disppered. The min minerl phses in the speimens eme more nd more simple. This ws the result of the mount of liquid dded to the system due to the inrese of sintering temperture. The sintering retion ws promoted, nd the densifition of porous sound-soring mterils ws elerted. Thus, the pore shpe in the speimen hnged gretly, nd some pores losed or disppered. The density of the speimens inresed ontinuously with the redution of the porosity, nd the ompressive strength of the speimens ws lso improved notly. Fig. 5 shows the sound-sorption oeffiients of the speimens prepred t different sintering tempertures. The sound-sorption oeffiients of the speimens prepred t different sintering tempertures t the low frequeny were etween 0.10 nd 0.55, nd the high frequeny oeffiients were etween 0.25 nd The sound-sorption performne initilly inresed nd then deresed with inresing sintering temperture. The sound sorption of the speimens in the low frequeny rnge hnged rpidly nd deresed fter 1050 C; nd tht of the speimens in the high frequeny rnge deresed fter 1130 C. The hnge of the pore shpe nd size with sintering temperture ould use this differene in the hnge trends in sound-sorption properties etween the low frequeny nd high frequeny rnges. As the sintering temperture inresed from 1000 to 1150 C, the NRC ws improved from 0.37 to 0.44, ut the NRC of the speimen prepred t 1150 C delined to With inresing sintering temperture, the density of the porous mterils inresed nd the porosity deresed. The ir permeility delined with the inrese of flow resistne, whih used the sound-sorption oeffiient of the speimen sintered t 1150 C to derese shrply. The speimen sintered t 1100 C hd higher porosity; the pores were irregulr, reltively uniform nd more tortuous, so its sound sorption performne ws good nd NRC rehed However, the sound sorption performne of the speimen sintered t 1130 C ws etter thn the speimen sintered t 1100 C in the high frequeny rnge, nd its NRC rehed Therefore, the pproprite sintering temperture for mteril preprtion ws 1130 C, sed on nlysis of the mehnil nd sound-soring properties of the porous mteril Effet of sintering time on sound-soring mteril The effet of the sintering time on the struture nd properties of the steel slg porous sound-soring mteril ws studied with sintering temperture of 1130 C, 50% fly sh, nd 20% ol powder. Tle 3 shows tht sintering time hd smll impt on the density, pprent porosity, nd ompressive strength of the speimens t the sme sintering temperture. As the sintering time inresed from 4.5 to 9.0 hr, the density of the speimens ws slightly inresed y 0.11 g/m3 nd the pprent porosity of the speimens deresed y 2.8%. The ompressive performne of speimens inresed orrespondingly from 5.75 to 7.12 MP. When the sintering time exeeded 6.0 hr, it hd little ontriution to the sintering densifition of the speimens, nd the hnges of the density, pprent porosity, nd ompressive strength were very smll.

5 71 Intensity (.u.) Intensity(.u.) Intensity(.u.) Diopside Gehlenite Andrdite Anorthite Kirshsteinite Mgnesium iron oxide Fly sh 50% Fly sh 20% θ ( ) 1150 C 1050 C θ ( ) Diopside Gehlenite Andrdite Anorthite Kirshsteinite Mgnesium iron oxide Diopside Gehlenite Andrdite 7.5 hr 4.5 hr θ ( ) Fig. 4 XRD ptterns of the speimens with different rtios of fly sh (), different tempertures () nd different sintering times (). Sound sorption oeffiient (α) Sound sorption oeffiient (α) Sound sorption oeffiient (α) % 30% 40% 50% Frequeny (Hz) C 1050 C 1100 C 1130 C 1150 C Frequeny (Hz) hr 6.0 hr 7.5 hr 9.0 hr Frequeny (Hz) Fig. 5 Effet of the rtios of fly sh (), sintering temperture () nd sintering time () on sound sorption property. The Snning Eletroni Mirosopy (SEM) imges shown in Fig. 3e nd f indited tht the speimen sintered for 6.0 hr hd muh higher porosity thn tht sintered for 9.0 hr; its pores were more numerous nd lrger thn the pores of the speimens sintered for 9.0 hr. Moreover, the pores of the speimen sintered for 6.0 hr were uniform nd onneted nd hd n irregulr shpe. The speimen sintered for 9.0 hr ws more ompt thn tht sintered for 6.0 hr, ut the pores were still onneted. Fig. 4 shows the XRD ptterns of the speimens with sintering times of 4.5 nd 7.5 hr. The min minerl phses in the speimens sintered for 4.5 hr inluded diopside, gehlenite, nd smll mount of ndrdite. With the extension of sintering time, the diffrtion peks of diopside nd gehlenite were enhned nd the diffrtion pek of ndrdite deresed. Inresing the sintering time promoted formtion of minerl phse nd ompleted the sintering retion, nd thus the densifition of the porous sound-soring mterils ws improved. It is lso shown in Fig. 3e nd f tht the densifition of the speimen sintered for 9.0 hr ws etter thn the speimen sintered for 6.0 hr; few losed pores were formed. Thus, the pprent porosity deresed slightly nd the density of speimens lso inresed, nd the ompressive strength of the speimens ws enhned ordingly.

6 72 J O U RN A L OF E N V I RO N ME N TA L SC IE N CE S 3 6 ( ) Tle 3 Effet of the sintering temperture, sintering time, nd porosity regultion on density, pprent porosity, nd ompressive strength of the speimens. Density (g/m3) Apprent porosity (%) Compressive strength (MP) Ft Sintering temperture ( C) Sintering time (hr) Method of porosity regultion Adding 10% ol Adding 20% ol Adding 30% ol Adding 40% ol Adding 30% ol nd 1.0% H2O2 Adding 30% ol nd 1.5% H2O2 It is shown in Fig. 5 tht the sound-sorption oeffiients of the speimens in the low frequeny nd high frequeny rnges were nd , respetively. The sound-sorption performne initilly inresed nd then deresed slightly with inresing sintering time. The NRC of the speimens sintered for 6.0 nd 9.0 hr improved from 0.39 to 0.44, nd then deresed to 0.42 s the sintering time exeeded 7.5 hr. The inrese of sintering time hd little effet on the density nd porosity of the speimens ut it hd signifint effet on the pore morphology. The speimen sintered for 6.0 hr hd more numerous, irregulr, nd uniform pores with mny omplited pore hnnels, nd so its sound-sorption performne ws etter nd its NRC ws Therefore, the pproprite sintering time of the mteril preprtion ws determined to e 6.0 hr y ompring the d Fig. 6 SEM morphology nd distriution of the pores in the speimens with different porosity regultion methods (: 10% ol ; : 20% ol ; : 30% ol ; d: 30% ol nd 1.0% H2O2). mehnil nd sound-soring properties of the speimens with different sintering times Porosity regultion of the sound-soring mteril The influene of the porosity regultion method on the properties of the steel slg porous sound-soring mteril ws investigted with sintering temperture of 1130 C, sintering time of 6.0 hr, nd 50% fly sh. Certin generliztions n e derived from the dt in Tle 3. When the mount of ol powder inresed from 10% to 40%, the density of the speimens deresed y 0.35 g/m3, the pprent porosity inresed y 14.8%, nd the ompressive strength of the speimens fell y 0.66 MP. After dding 1.0% nd 1.5% foming gent, the density of the speimens deresed to 0.94 g/m3, pprent porosity inresed from 61.4% to 65.9%, nd the ompressive strength signifintly delined to 6.53 MP. The SEM imges shown in Fig. 6 show tht the porosity of the speimens ws lerly inresed y inresing the mount of ol powder nd dding foming gent. The speimen with 30% ol powder hd more pores thn for other dosge of ol powder. The speimen with the foming gent dded hd etter developed nd etter onneted pores thn the speimens with only ol powder dded. Thus, the porosity of the speimen ould e improved y inresing the mount of pore former nd foming gent; in prtiulr, the ddition of the foming gent ould signifintly improve the porosity nd llowed the pores to onnet. The density nd ompressive strength of the speimen deresed with the inrese of porosity, ut the ompressive strength of the speimen ws still mintined t more thn 6.5 MP. Fig. 7 shows the experimentl results of porosity regultion. The sound-sorption oeffiients of the speimens prepred only using ol powder s pore former in the low frequeny nd high frequeny rnges were nd , respetively. The sound-sorption oeffiient ws thus improved with inresing mounts of ol powder, nd the NRC ws etween 0.38 nd After dding the foming gent, the sound-sorption performne t low frequeny ws improved signifintly nd the sound-sorption

7 73 Sound sorption oeffiient (α) % Col 20% Col 30% Col % Col +1.0% H 2 O 2 30% Col +1.5% H O Frequeny (Hz) Fig. 7 Effet of the porosity regultion on sound-sorption properties. oeffiient rehed ; while its influene on the sound sorption performne t high frequeny ws not ovious, nd the sorption oeffiient ws etween 0.48 nd The porosity of the speimen ws improved y inresing the mount of ol powder, then the sound-sorption performne of the speimens ws lso improved nd the NRC rehed Adding foming gent not only improved the porosity of the speimen, ut it lso enled the pores to onnet nd improved the sound-sorption properties of the porous mterils t low frequeny, so the NRC ould reh ove In order to mintin suffiient mehnil properties in sound-soring mterils in prtil pplition, the pproprite dosges of ol powder nd foming gent were found to e 30% ol powder nd 1.0% H 2 O Comprison with ordinry sound-soring mterils The sorption oeffiients of the steel slg porous sound-soring mteril nd ordinry sound-soring mterils with the sme thikness, in the sme frequeny region, were ompred s shown in Tle 4 (M, 2002; M nd Shen, 2006). All of them were mesured y the stnding-wve method. As derived from Tle 4, the NRC of steel slg porous sound soring mterils ws higher thn tht of most other ommon sound-soring mterils nd similr to tht of ituminous minerl wool felt. However, the sound sorption performne of steel slg porous sound-soring mteril in the low-frequeny rnge ws etter thn tht of the ituminous minerl wool felt, nd the mehnil properties of the steel slg porous sound-soring mteril should e muh etter. The reserh results for other types of sound-soring mterils suh s nonwovens (Su et l., 2009), luminum fierord (M et l., 2008), nd porous ermis (Dun et l., 2012) showed NRC vlues of less thn 0.50, nd the sound sorption properties of these sound-soring mterils were inferior to the steel slg porous sound-soring mteril with the sme thikness. Aousti soring mterils for highwy noise rriers (Arens et l., 2013) hve een designed from ottom sh nd ement, nd the highest NRC ould only reh 0.32 nd ws fr elow tht of the steel slg porous sound soring mteril. Reserh results for porous glss (Zhou et l., 2014) showed tht its NRC in the Hz rnge ws out 0.5. Its high frequeny sound sorption properties were similr to steel slg porous sound soring mterils, ut the sound sorption performne in the low-frequeny rnge ws lower. Therefore, the steel slg porous sound-soring mteril ould e used in highwys, rilwys, nd other res where noise pollution is diffiult to ontrol, nd its rnge of pplition would e wider thn other sound-soring mterils. The NRC of steel slg porous sound-soring mteril is 0.78 fter pproximtely onverting the sound-soring oeffiient ttined y the stnding wve tue method to sound-soring oeffiient in reverertion room (M, 2002). Aording to the Grdtion of Sound Asorption Property for Asorent Produts (GB/T ), the sound sorption of steel slg porous sound-soring mteril is grde II nd the steel slg porous sound-soring mteril is n exellent sound sorption produt. 3. Conlusions A steel slg porous sound-soring mteril ws prepred using fly sh, ol powder, nd sodium silite s modifier, pore former, nd inder, respetively. The results showed tht the pprent Tle 4 Comprison of steel slg porous sound-soring mteril nd ordinry sound-soring mteril. Mteril tegories Mteril nmes Frequeny (Hz) NRC Steel slg porous sound-soring mteril Firous mterils nd produts Asestos Bituminous minerl wool felt Wood wool sls Fom mterils nd produts Fom glss Polyurethne foming plsti UF fomed plstis Prtile ousti produts Cement perlite lok Cly oustil tile Plster produts Fomed onrete loks Fomed gypsum NRC: noise redution oeffiient.

8 74 JOURNAL OF ENVIRONMENTAL SCIENCES 36 (2015) porosity of the speimens ws improved y dding the optimum mount of ol powder, nd the pore onnetivity ws improved fter dding foming gent. Thus, the sound-sorption performne t low frequeny ws improved y dding ol powder nd foming gent. The pprent porosity nd NRC of the steel slg porous sound-soring mteril ould reh more thn 60.0% nd 0.50 respetively, nd the ompressive strength of the sintered speimens ws ove 6.5 MP. The optimum preprtion onditions for steel slg porous sound-soring mteril were 50% fly sh (wt.%), 30% ol nd 1.0% H 2 O 2 (wt.%), sintering temperture of 1130 C nd sintering time of 6.0 hr, whih were determined y nlyzing the properties of the sound-soring mterils. The utiliztion perent of steel slg ould e improved nd reh more thn 65.0% y this method. In ddition, this preprtion method ould tret wstes with wstes, using fly sh s rw mteril. 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