- 李海川
2016年第5期
摘要
引用本文
摘??要:通過裂縫測寬儀分析討論了NaCl、Na2CO3和Na2SO4三種鹽溶液環境對不同寬度的水泥砂漿裂縫自修復效果的影響,并研究了水泥砂漿試樣在上述不同鹽環境下的修復前后強度變化。結果表明,在NaCl和Na2SO4溶液中,隨著溶液濃度(0、0.5%、1.0%、2.0%)的升高,裂縫自修復能力呈現出先升高后降低的趨勢,并且當溶液濃度為0.5%時,可以修復裂縫為0.02mm的寬度;在Na2CO3溶液中,隨著溶液濃度的升高(0、0.5%、1.0%、2.0%),裂縫自修復效果有升高的趨勢,并且當Na2CO3溶液濃度為2.0%時,可以修復裂縫為0.02mm的寬度;裂縫自修復的主要原因是未水化水泥顆粒的繼續水化,同時溶液中不同離子與水泥水化產物反應的生成物也可以促進裂縫修復。Abstract:Theinfluencesofthreedifferentsaltsolutions(NaCl、Na2CO3?andNa2SO4)onself-healingeffectofcementmortarcrackswithdifferentwidthwereresearchedbycrackwidthgaugeandthestrengthchangesofcementmortarbeforeandafterself-healinginthedifferentsaltenvironmentswerealsostudied.Theresultsindicatethattheself-healingcapabilityofcementmortarfirstincreasedandthendecreasedwiththeincreasingofsolution(NaClandNa2SO4)concentrations(0、0.5%、1.0%、2.0%).Thecrackwidth(0.02mm)ofcementmortarcouldbehealedwhenthesolutionconcentrationis0.5%.Theself-healingcapabilityofcementmortarincreasedwiththeincreasingofNa2CO3?solutionconcentrations(0、0.5%、1.0%、2.0%).Thecrackwidth(0.02mm)couldbehealedwhentheNa2CO3?solutionconcentrationis2.0%.Themainself-healingreasonisthattheun-hydratedcementparticlescontinuestohydrateandtheproductionmattersproducedbydifferentionsindifferentsolutionsreactionwiththecementhydrationproductscouldpromotethehealingeffectofcementmortar.