纳米SiO_2对磷建筑石膏性能影响研究
|
摘要
本试验研究了不同掺量下纳米SiO_2对磷建筑石膏的2 h抗折强度、绝干抗折强度、2 h抗压强度、绝干抗压强度、吸水率及软化系数的影响,并通过SEM对磷建筑石膏进行微观分析。结果表明:随着纳米SiO_2掺量的增加,磷建筑石膏的抗折强度、抗压强度均呈现先上升后下降的趋势。当纳米SiO_2掺量为1%时,其对磷建筑石膏强度增强效果最好,2 h抗折强度、绝干抗折强度、2 h抗压强度、绝干抗压强度分别达到3.9MPa、8.5 MPa、14.4 MPa、24.3 MPa,较空白组分别提高14.7%、4.9%、55%、63%;随着纳米SiO_2掺量的增加,磷建筑石膏的吸水率不断降低,软化系数不断增加,纳米SiO_2掺量达到2%时,磷建筑石膏吸水率达到最低19%,较空白组降低47%;同时其软化系数达到80%,较空白组提高122%。
The effect of nano-SiO_2 on the 2 h flexural strength, absolute flexural strength, 2h compressive strength, absolute compressive strength, water absorption and softening coefficient of nano-SiO_2 on different building phosphorus was studied in this experiment. Microscopic analysis of phosphorus building gypsum. The experimental results show that with the increase of nano-SiO_2 content, the flexural strength and compressive strength of phosphorus building gypsum show a trend of increasing first and then decreasing. When the content of nano-SiO_2 is 1%, it has the best strength enhancement effect on phosphorus building gypsum. The 2 h flexural strength, absolute flexural strength, 2h compressive strength and absolute dry compressive strength reach 3.9 MPa and 8.5MPa respectively. 14.4 MPa, 24.3 MPa, 14.7%, 4.9%, 55%, 63% higher than the blank group; with the increase of nano-SiO_2 content, the water absorption rate of phosphorus building gypsum is decreasing, the softening coefficient is increasing, and the nano-SiO_2 content is increased. When it reaches 2%, the water absorption rate of phosphorus building gypsum reaches 19%, which is 47% lower than that of the blank group. At the same time, its softening coefficient reaches 80%, which is 122% higher than that of the blank group.
The effect of nano-SiO_2 on the 2 h flexural strength, absolute flexural strength, 2h compressive strength, absolute compressive strength, water absorption and softening coefficient of nano-SiO_2 on different building phosphorus was studied in this experiment. Microscopic analysis of phosphorus building gypsum. The experimental results show that with the increase of nano-SiO_2 content, the flexural strength and compressive strength of phosphorus building gypsum show a trend of increasing first and then decreasing. When the content of nano-SiO_2 is 1%, it has the best strength enhancement effect on phosphorus building gypsum. The 2 h flexural strength, absolute flexural strength, 2h compressive strength and absolute dry compressive strength reach 3.9 MPa and 8.5MPa respectively. 14.4 MPa, 24.3 MPa, 14.7%, 4.9%, 55%, 63% higher than the blank group; with the increase of nano-SiO_2 content, the water absorption rate of phosphorus building gypsum is decreasing, the softening coefficient is increasing, and the nano-SiO_2 content is increased. When it reaches 2%, the water absorption rate of phosphorus building gypsum reaches 19%, which is 47% lower than that of the blank group. At the same time, its softening coefficient reaches 80%, which is 122% higher than that of the blank group.
引文
[1]王祁青.石膏基建材与应用[M].北京:化学工业出版社,2009:4-8.
[2]李美,彭家惠,张建新,等.磷建筑石膏的特性及其改性[J].硅酸盐通报,2012,31(3):553-558.
[3]YAKOVLEV G,POLYANSKIKH I,FEDOROVA G,et al.Anhydrite and Gypsum Compositions Modified with Ultrafine Man-Made Admixtures[J].Procedia Engineering,2015,108:13-21.
[4]LU C,LI S,LEI L,et al.Bending strength properties of cement modified with nano-materials[J].Electronic Journal of Geotechnical Engineering,2015,20(8):3647-3654.
[5]刘丹,杜应吉,史凯方.纳米二氧化硅对活性粉末混凝土力学性能影响的试验研究[J].中国农村水利水电,2011(12):127-130.
[6]朱靖塞,许金余,白二雷,等.不同减水剂对纳米Ca CO3分散性及水泥基复合材料力学性能的影响[J].混凝土,2015(8):71-73.
[7]张付奇,李刚,李洁,等.外加剂改善石膏耐水性能试验研究[J].非金属矿,2015,38(4):26-28.
[8]黄政宇,曹方良.纳米材料对超高性能混凝土性能的影响[J].材料导报,2012,26(18):136-141.
[9]AN Y X.Effect of Nano Materials on Durability of High Performance Concrete[J].Advanced Materials Research,2013,742:220-223.
[10]张海燕,吴勇军.纳米Si O2对高性能混凝土力学性能的影响[J].新型建筑材料,2012,39(7):78-80.
[11]刘志华,杨久俊,陈兵,等.磷石膏粉煤灰改性生土材料试验研究[J].粉煤灰综合利用,2016(1):3-6.
[2]李美,彭家惠,张建新,等.磷建筑石膏的特性及其改性[J].硅酸盐通报,2012,31(3):553-558.
[3]YAKOVLEV G,POLYANSKIKH I,FEDOROVA G,et al.Anhydrite and Gypsum Compositions Modified with Ultrafine Man-Made Admixtures[J].Procedia Engineering,2015,108:13-21.
[4]LU C,LI S,LEI L,et al.Bending strength properties of cement modified with nano-materials[J].Electronic Journal of Geotechnical Engineering,2015,20(8):3647-3654.
[5]刘丹,杜应吉,史凯方.纳米二氧化硅对活性粉末混凝土力学性能影响的试验研究[J].中国农村水利水电,2011(12):127-130.
[6]朱靖塞,许金余,白二雷,等.不同减水剂对纳米Ca CO3分散性及水泥基复合材料力学性能的影响[J].混凝土,2015(8):71-73.
[7]张付奇,李刚,李洁,等.外加剂改善石膏耐水性能试验研究[J].非金属矿,2015,38(4):26-28.
[8]黄政宇,曹方良.纳米材料对超高性能混凝土性能的影响[J].材料导报,2012,26(18):136-141.
[9]AN Y X.Effect of Nano Materials on Durability of High Performance Concrete[J].Advanced Materials Research,2013,742:220-223.
[10]张海燕,吴勇军.纳米Si O2对高性能混凝土力学性能的影响[J].新型建筑材料,2012,39(7):78-80.
[11]刘志华,杨久俊,陈兵,等.磷石膏粉煤灰改性生土材料试验研究[J].粉煤灰综合利用,2016(1):3-6.