自燃煤矸石加气混凝土性能与孔结构研究  

Properties and pore structure of spontaneous combustion gangue aerated concrete

作　　者：陈彦文[1] 吴晓丹[1] 李硕 CHEN Yanwen;WU Xiaodan;LI Shuo(School of Material Science and Engineering,Shenyang Jianzhu University,Shenyang 110000,China)

机构地区：[1]沈阳建筑大学材料科学与工程学院,辽宁沈阳110000

出　　处：《混凝土》2021年第5期27-31,35,共6页Concrete

基　　金：十三五国家重点研发计划(2016YFC0700807)。

摘　　要：为了探究自燃煤矸石在加气混凝土中替代胶凝材料的可行性,利用30%自燃煤矸石粉替代加气混凝土中的胶凝材料,铝粉、2Na_(2)CO_(3)·3H_(2)O_(2)+KMnO_(4)、2Na_(2)CO_(3)·3H_(2)O_(2)+FeSO_(4)为发泡剂,Na H_(2)PO_(4)为稳泡剂,研究自燃煤矸石加气混凝土性质及气孔参数。试验结果表明,当水胶比0.6,铝粉掺量1‰时,孔隙率63.95%,抗压强度3.67 MPa,干表观密度570 kg/m^(3),综合性能达到B05级;当2Na_(2)CO_(3)·3H_(2)O_(2)做发泡剂,FeSO_(4)做催化剂,水胶比0.6,发泡剂掺量3%时,干表观密度875 kg/m^(3),抗压强度仅为4.71 MPa;用5%掺量的2Na_(2)CO_(3)·3H_(2)O_(2)+FeSO_(4)制备的加气混凝土,综合性能符合B06级的要求。KMnO_(4)做催化剂时,制备的加气混凝土干表观密度较大,强度较低,FeSO_(4)更适合做2Na_(2)CO_(3)·3H_(2)O_(2)的催化剂。通过对加气混凝土气孔结构分析可知,铝粉作为发泡剂时,加气混凝土孔径分布均匀合理,孔径大于0.5 mm的孔数量大于50%,随着水胶比的增大,大于0.5 mm的孔数量增多。2Na_(2)CO_(3)·3H_(2)O_(2)为发泡剂时,孔径小于0.2 mm的孔数量较多,加气混凝土孔隙率较小。In order to explore the feasibility of replacing gelling materials with spontaneous combustion gangue in aerated concrete,using 30%spontaneous combustion gangue powder instead of gelling material in aerated concrete,and aluminum powder,2Na_(2)CO_(3)·3H_(2)O_(2)+KMnO_(4),2Na_(2)CO_(3)·3H_(2)O_(2)+FeSO_(4) as foaming agent,NaH_(2)PO_(4) as foam stabilizer agent.Study on properties and stomatal parameter of spontaneous combustion gangue aerated concrete.The experimental results shows that,when the water-binder ratio is 0.6 and the content of aluminum powder is 1‰,the porosity is 63.95%,the compressive strength is 3.67 MPa,the dry apparent density is 570 kg/m^(3),and the comprehensive performance reaches B05.When 2Na_(2)CO_(3)·3H_(2)O_(2) is used as foaming agent and FeSO_(4) is used as catalyst.When the water-binder ratio is 0.6,the content of foaming agent is 3%,the dry apparent density is 875 kg/m^(3),and the compressive strength is only 4.71 MPa.The aerated concrete with 5%2Na_(2)CO_(3)·3H_(2)O_(2)+FeSO_(4),the comprehensive performance reaches B06.When KMnO_(4) is used as catalyst,the aerated concrete has a higher dry apparent density and lower compressive strength,FeSO_(4) is more suitable as catalyst for 2Na_(2)CO_(3)·3H_(2)O_(2).According to the analysis of aerated concrete′s pore structure,when aluminum powder is used as foaming agent,the aerated concrete has uniform pore size distribution,and the number of pores larger than 0.5 mm is 50%larger.With the water-binder ratio increases,the pores larger than 0.5 mm increase.When 2Na_(2)CO_(3)·3H_(2)O_(2) is foaming agent,the pore diameter less than 0.2 mm is more,and the porosity of aerated concrete is small.

关 键 词：自燃煤矸石 加气混凝土 孔隙率 孔径 

分 类 号：TU528.01[建筑科学—建筑技术科学]