关键词: 大温差;桥墩养护;水化热;温度裂缝

Abstract: Most region of northwest China is often dry , wind, and big temperature difference .The special climate environment brought unfavorable influence to the early cracking of concrete , the cracking of concrete bridge piers under the influence of various factors , the largely temperature difference of hydration heat is the main reason of cracking in early concrete pier , therefore, the study of temperature field to prevent concrete bridge pier cracked early have important guiding significance .Different ways of curing lead the difference of concrete piers 'internal and external temperature distribution . This experiment adopt three different ways of curing , the results show that concrete piers of the natural curing can lead too large early temperature stress , that may cause temperature crack , geotextile package curing of concrete have heat preservation effect , can improve the concrete internal temperature difference , the new material package maintenance's effect is best , the early good insulation moisturizing effect makes the temperature distribution inside the piers is relatively uniform , and can greatly reduce the temperature stress and strain , that have a good curing effect .

Key words: large temperature difference;bridge pier maintenance;hydration heat;temperature crack