Temperature-dependent Cohesion of Fresh Cement-based Materials with PAM
GU Linan1, WANG Yanan1, SUI Gaoyang2, PAN Zhengqi1, FENG Jingjing1,*
1 College of Water Conservancy and Civil Engineering, Shandong Agricultural University, Tai’an 271000, Shandong, China 2 Shandong Survey and Design Institute of Water Conservancy Company Limited, Jinan 250000, China
Abstract: To explore the influence of PAM on the cohesion of fresh cement-based materials, the shear viscosity, fluidity and water retention of fresh cement-based materials with different PAM (0%—0.10%) content were tested at different temperatures (20, 40 and 60 ℃). The mechanism of adsorption and hydrogen bonding on PAM modification was discussed by means of organic carbon content, apparent viscosity and UV-vis. The results show that PAM can improve the cohesion of fresh cement-based materials at room temperature, and the enhancing effect increases with the raise of PAM content, but decreases with the raise of temperature, and it is almost ineffective at 60 ℃. The adsorption capacity of cement particles to PAM enhances with the increase of PAM content or temperature. Residual PAM content in the interstitial solution of paste increases with the increase of PAM content, but decreases with the raise of temperature. Meanwhile, the hydrogen bonding between PAM and water enhances with more PAM added, but weakens when the temperature rises. The influence of PAM on the cohesion of fresh cement-based materials is more closely related to the hydrogen bonding between residual PAM and water molecules in cement interstitial solution compared with the adsorption between PAM and cement particles. The cohesion enhancing effect of PAM comes from the dual drive of adsorption behavior and hydrogen bonding. At room temperature, it can significantly improve cohesiveness, but as the temperature increases, the weakening of hydrogen bonding leads to a less significant improvement in cohesiveness than that at room temperature.
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2025, Vol. 39 
