改性磷石膏对石膏矿渣水泥水化过程的影响研究
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摘要
采用质量分数为5%~25%的改性磷石膏、15%的硅酸盐水泥熟料、60%~80%的矿渣混合磨细制成石膏矿渣水泥,研究了改性磷石膏掺量对石膏矿渣水泥浆体的抗压强度、水化热、孔溶液pH值及水化产物的影响情况。结果表明,掺入改性磷石膏使得石膏矿渣水泥的3 d、7 d抗压强度降低,其掺量为10%、15%时,水泥的28 d、90 d抗压强度超过普通硅酸盐水泥。在3 d至90 d龄期内,水泥孔溶液pH值随龄期增长而逐渐增大。在相同龄期时,随着改性磷石膏掺量的增大,水泥孔溶液pH值减小,水化放热峰出现时间延缓。微观分析表明,掺入改性磷石膏后,28 d龄期时的水泥水化产物主要为钙矾石和C-S-H凝胶,水化产物的生成量在改性磷石膏掺量为15%时最多。
Gypsum slag cement was produced by mixing modified phosphogypsum( 5%-25% in mass),Portland cement clinker( 15% in mass) and slag( 60%-80% in mass). The compressive strength,heat of hydration, pH value of pore solution and hydration products of the gypsum slag cement were investigated. The results show that the compressive strength of the gypsum slag cement at 3 d and 7 d decreased with the incorporation of phosphogypsum. When the content of phosphogypsum reached 10% and 15%,the compressive strength at 28 d and 90 d surpass that of the ordinary portland cement. The pH value of the pore solution increased with the increase of age from 3 d to 90 d. At the same age,the pH value of the pore solution decreased,the occurring time of the exothermic peak increases,with the increase of phosphogypsum. The hydration products at the age of 28 d are mainly ettringite and calcium silicate hydrate,and the amount of hydration products reach the most with 15% of phosphogypsum.
Gypsum slag cement was produced by mixing modified phosphogypsum( 5%-25% in mass),Portland cement clinker( 15% in mass) and slag( 60%-80% in mass). The compressive strength,heat of hydration, pH value of pore solution and hydration products of the gypsum slag cement were investigated. The results show that the compressive strength of the gypsum slag cement at 3 d and 7 d decreased with the incorporation of phosphogypsum. When the content of phosphogypsum reached 10% and 15%,the compressive strength at 28 d and 90 d surpass that of the ordinary portland cement. The pH value of the pore solution increased with the increase of age from 3 d to 90 d. At the same age,the pH value of the pore solution decreased,the occurring time of the exothermic peak increases,with the increase of phosphogypsum. The hydration products at the age of 28 d are mainly ettringite and calcium silicate hydrate,and the amount of hydration products reach the most with 15% of phosphogypsum.
引文
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[2]杨荣辉,水中和.磷石膏-矿渣体系水化过程与水化产物研究[J].建材世界,2016,37(1):33-36,41.
[3]候姣姣.磷石膏基材料的微观反应机理及强度规律研究[D].武汉:中国地质大学,2014.
[4]权娟娟,王宁,王晴,等.不同温度下矿渣-水泥复合胶凝体系水化反应特性研究[J].硅酸盐通报,2016,35(10):3264-3269.
[5]王晴,王宁,林琛,等.矿渣-水泥复合胶凝材料体系水化反应特性的研究[J].新型建筑材料,2013(4):5-7.
[6]Kolani B,Buffo-Lacarrière L,Sellier A,et al.Hydration of slag-blended cements[J].Cement and Concrete Composites,2012,34(9):1009-1018.
[7]Aveline D,Bernard E,Stéphanie S.How to assess the hydration of slag cement concretes?[J].Construction and Building Materials,2013,40:1012-1020.
[8]Tarek M,Marwen B,Nour E,et al.Contribution to the modeling of hydration and chemical shrinkage of slag-blended cement at early age[J].Construction and Building Materials,2013,44:368-380.
[9]Aashay A,Gaurav S,Narayanan N.Ternary blends containing slag and interground/blended limestone:Hydration,strength,and pore structure[J].Construction and Building Materials,2016,102:113-124.
[10]林宗寿,黄赟.磷石膏基免煅烧水泥的开发研究[J].武汉理工大学学报,2009,31(4):53-55,62.
[11]方永浩,朱琦,岑奕侃,等.大掺量超细矿渣粉水泥基胶凝材料的性能与结构及磷石膏的影响[J].硅酸盐学报,2008,36(4):444-450.
[12]林宗寿,黄赟,水中和,等.过硫磷石膏矿渣水泥与混凝土[M].武汉:武汉理工大学出版社,2015:84.
[13]袁继峰,刘彬,董晓进.磷石膏基水泥的早期水化性能研究[J].混凝土,2014,8:92-97.