纤维改性磷石膏基胶凝材料及阻裂作用机理分析  

Fiber Modified Phosphogypsum-based Cementitious Material and Anti-cracking Mechanism Analysis

作　　者：何玉鑫 万建东 刘小全 华苏东[2] 

机构地区：[1]江苏省一夫新材料科技有限公司,南京211178 [2]南京工业大学材料科学与工程学院,南京210009

出　　处：《水泥技术》2013年第5期23-26,共4页Cement Technology

摘　　要：在磷石膏基胶凝材料(PGS)中加入纤维改善PGS的抗裂性能,通过评价不同龄期样品的抗冲击功、抗折强度、抗冻融性能和分析断口形貌等表征纤维对PGS固化体的抗裂效果。结果表明:化纤对PGS固化体增韧和抗裂性能优于矿纤和玻纤。在20℃(湿度>90%)条件下,化纤掺量为0.7%时,PGS固化体28d的抗冲击功和抗折强度分别较净浆试块提高了389.5%和50.6%;在冻融循环15次后掺化纤的PGS固化体抗冲击功、抗折强度和质量损失率较PGS净浆固化体分别降低了87.4%、71.4%和86.0%;化纤穿插于PGS固化体内部,形成一种三维的网状包裹状态,起桥联搭接作用,抗裂效果显著。Municipal Fibers were used to improve phosphogypsum-lmsed cementalions material （P（,S） anti-cracking ability. The intluenee of adding fiber was investigated by measuring the impact work, flexral strength, freeze-resistam＇e, and the microscopy of fracture st, rfaee. Resuhs showed thai fiber could prevenl PGS from cracking obviously better than both mi,leral fiber and glass tiber. The impact work and the flexural strength of PGS wilh 0.7% fiber cared at 20℃ （R.H./〉 90）for 28d were increased by 389.5% and 50.6% respectively; after 15 freeze-Lhaw cycles, the impaet work, flexural strength and mass loss rate of eementitious material with 0.7% fiber were decreased hv 87.4%, 71.4% and 50.4% respectively. The tiber distribuled in the matrix of hardened PDS offered a brh.lging fnnciion notably because of three-dimeiisional network siruehire.

关 键 词：磷石膏 胶凝材料 纤维 抗裂 抗冻性能 

分 类 号：X781.3[环境科学与工程—环境工程]