基于水膜厚度、浆膜厚度的沸石粉砂浆性能研究
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摘要
为探索沸石粉对砂浆性能的综合影响,研究测量了25组不同水胶比、不同沸石粉掺量下水泥砂浆的流动性能、粘聚性和抗压强度。为揭示沸石粉砂浆的流变性能控制机理,进一步测量了5组不同沸石粉掺量砂浆的填充密度,并基于填充密度测量结果计算出填充密度和比表面积,进而计算各砂浆试样配比的水膜厚度和砂浆膜厚度,探索水膜厚度和砂浆膜厚度对沸石粉砂浆流变性能的影响。实验结果表明,沸石粉的掺入能在不影响流动性的情况下显著提高砂浆的粘聚性,沸石粉掺量越大,砂浆粘聚性能越好。砂浆的抗压强度随沸石粉掺量的增大而逐渐降低。掺入不大于10%的沸石粉能提高填充密度,砂浆的流动性能主要取决于水膜厚度,浆膜厚度对流动性能也有影响,浆膜厚度越大流动性越高。
To research the effect of zeolite powder on performance,water film thickness and paste film thickness,this study measured the flowability,cohesiveness and strength of 25 mixes of cement-sand mortar with different water/binder ratio.To reveal the roles of water film thickness and paste film thichness in the rheological properties of cement-sand mortar,this study measured the packing density of 5 different powder mixes with various zeolite powder content,and calculated the water film thickness and paste film thickness of the 25 mixes of cement-sand mortar.Results demonstrated that addition of zeolite powder has little effect on the flow properties of cement mortar,but improve the cohesiveness of cement-sand mortar and impair the compressive strength.Packing density results showed that with the increase of the amount of zeolite powder,the packing density will increase first and then decrease.Water film thickness is the key factor governing the flowability and rheoiogy.Paste film thickness would also affect the flowability of mortar.A relatively large paste film thickness would lead to higher flowability.
To research the effect of zeolite powder on performance,water film thickness and paste film thickness,this study measured the flowability,cohesiveness and strength of 25 mixes of cement-sand mortar with different water/binder ratio.To reveal the roles of water film thickness and paste film thichness in the rheological properties of cement-sand mortar,this study measured the packing density of 5 different powder mixes with various zeolite powder content,and calculated the water film thickness and paste film thickness of the 25 mixes of cement-sand mortar.Results demonstrated that addition of zeolite powder has little effect on the flow properties of cement mortar,but improve the cohesiveness of cement-sand mortar and impair the compressive strength.Packing density results showed that with the increase of the amount of zeolite powder,the packing density will increase first and then decrease.Water film thickness is the key factor governing the flowability and rheoiogy.Paste film thickness would also affect the flowability of mortar.A relatively large paste film thickness would lead to higher flowability.
引文
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[14]王茹,张绍康,王高勇.沸石对丁苯共聚物/水泥凝结硬化及早期水化的影响[J].建筑材料学报,2018,21(2):179-184+201.
[15]康忠寿,钮宏,徐建虎.硅粉和沸石粉双掺配制高强度大流动性混凝土[J].交通标准化,2005,(12):65-66.
[16]李寿冬,吴伟豪,蔡建军,等.天然沸石粉作为混凝土辅助性胶凝材料的研究[J].建筑监督检测与造价,2010,3(5):16-21.
[2] Feng N,Peng G.Applications of natural zeolite to construction and building materials in China[J].Construction and Building materials,2005,19(8):579-584.
[3] Ortega EA,Cheeseman C,Knight J.Properties of alkali-activated clinoptilolite[J].Cement and Concrete Research,2000,30(10):1641-1646.
[4]李淑进,吴科如.沸石粉及其在高性能混凝土中的应用[J].山东建材,2004,25(1):40-43.
[5]谭多枝,张炜,赵永忠,等.沸石粉作为矿物掺合料对混凝土性能的影响[J].广东建材,2016,32(12):11-14.
[6]肖良丽,荣亚威,向铭铭,等.沸石粉对自密实混凝土内养护效果的试验研究[J].建材世界,2015,36(6):32-35.
[7]曹雄.沸石粉掺合料混凝土配制及其早龄期抗裂性能研究[D].海口:海南大学,2014.
[8]明阳,王军,陈景,等.沸石粉-石灰石粉混凝土的试验研究[J].混凝土与水泥制品,2012,(12):20-23.
[9] Zhang J,Ding XP,Wang Q,et al.Effective solution for low shrinkage and low permeability of normal strength concrete using calcined zeolite particles[J].Construction and Building Marerials,2018,160:57-65.
[10]季雷.掺沸石粉配制高性能混凝土试验研究[J].铁道建筑技术,2010,(4):78-80.
[11]武铁明,林怀立.利用沸石粉配制高性能混凝土的应用研究[J].混凝土,2001,(10):17-20+58.
[12] Nagrockiene D,Girskas G.Research into the properties of concrete modified with natural zeolite addition[J].Construction and Building Marerials,2016,113:964-969.
[13]冯乃谦,郏红卫.关于利用天然沸石粉抑制水泥混凝土中碱骨料反应的研究[J].混凝土与水泥制品,1995,(2):8-14+41.
[14]王茹,张绍康,王高勇.沸石对丁苯共聚物/水泥凝结硬化及早期水化的影响[J].建筑材料学报,2018,21(2):179-184+201.
[15]康忠寿,钮宏,徐建虎.硅粉和沸石粉双掺配制高强度大流动性混凝土[J].交通标准化,2005,(12):65-66.
[16]李寿冬,吴伟豪,蔡建军,等.天然沸石粉作为混凝土辅助性胶凝材料的研究[J].建筑监督检测与造价,2010,3(5):16-21.