温度对碱激发再生混凝土微粉砂浆抗压强度的影响

Effect of Temperature on the Compressive Strength of the Mortar Made of Alkali Activated Recycled Concrete Debris

以再生微粉砂浆的强度、微观孔隙率为指标,结合部分再生微粉砂浆的XRD衍射图谱,对比研究在不同温度下,碱激发和不用碱激发再生微粉活性制备砂浆的抗压强度大小。通过比较研究发现碱激发反应温度对再生微粉砂浆抗压强度影响很大;温度过低,碱激发反应慢,一定时间内生成的胶凝性物质少,砂浆内孔隙率高,抗压强度低;温度过高,碱激发反应快,体系内生成胶凝土物凝结太快,砂浆孔隙率高,抗压强度低;因此碱激发再生微粉活性存在合适温度。

The recycled debris mortar compressive strength and micro porosity were chosen as indexes to research the influence on compressive strength with alkali-activated at different temperature, which was combined with the XRD diffraction pattern of part recycled debris mortar samples. It is found that alkali- activated and temperature have important influence on strength by comparing the experimental research.It is found that the alkali and the recycled concrete powders ratio and the curing temperature had great influences on stimulating recycled concrete powder mortar strength. If alkali excitation temperature is too low, the reaction rate is too slow and during a certain period, the gelling material is less, and the compressive strength of recycled mortar in high porosity is lower. And vice versa. Therefore, the alkali- activated reaction at the most suitable temperature brings most gelling material, and the compressive strength of the mortar is the best.