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Lanzhou Jiaotong University (兰州交通大学) 2020

Research and Application of Concrete Super Absorbent Polymer (SAP) Internal Curing Agent Suitable for Arid Areas in the Northwest

李昊

Titre : Research and Application of Concrete Super Absorbent Polymer (SAP) Internal Curing Agent Suitable for Arid Areas in the Northwest

Auteur :

Grade : Master’s Theses 2020

Université : Lanzhou Jiaotong University (兰州交通大学)

Résumé partiel
In view of the poor external maintenance effect and cracking of concrete caused by the environmental conditions in the arid area of Northwest China.Based on the theoretical analysis,macro performance test and engineering application,the internal maintenance agent of concrete Super Absorbent Polymer(SAP)suitable for the environment of northwest arid area was developed in this study.Meanwhile,the effect of self-developed SAP on concrete properties was studied and the site construction technology of SAP internal maintenance concrete was put forward.The research provides an important reference for promoting the development of concrete crack resistance technology in northwest arid area and the application of SAP internal maintenance in practical engineering.The work and conclusions of this study area as follows.Firstly,polyacrylic acid acrylamide superabsorbent resin was prepared by solution polymerization and step heating method.Based on the fuzzy orthogonal method,the process parameters of the synthesis of polyacrylic acid acrylamide superabsorbent resin were optimized.The water absorption ratio of SAP prepared under the optimal conditions is 626g/g.Furthermore,through the fluidity test of cement paste and the slump test of concrete,the reasonable content of SAP was determined to be 0.1% 0.5%.It can be seen from the study on the influence of SAP content and mixing method on the mechanical properties of concrete that there is a reasonable SAP content in the inner maintenance concrete.After water absorption treatment,SAP will have a negative effect on the compressive strength of concrete,and the mixing method was determined as dry mixing.The influence of SAP on the volume stability of concrete was studied.The results shows that SAP can effectively improve the self-shrinkage and crack resistance of concrete,and with the increase of SAP content,the self-shrinkage of concrete gradually decreases and crack resistance gradually increases.

Mots clés : Northwest arid ;SAP;Concrete ;Crack resistance ;Inner maintenance ;Engineering application ;

Présentation (CNKI)

Page publiée le 26 mars 2022