结构恶化 meaning in Chinese

structure deterioration

Results of experiment show that the reason of strength decreasing of gypsum added with retarders is that the retarders reduce the supersaturation of liquid phase , and makes the crystal grain largen , and pore is followed to worsen , which lead to the strength drop to a large degree
实验结果分析表明：在掺加缓凝剂后石膏硬化体强度下降的原因在于缓凝剂降低了石膏的液相过饱和度，使结晶颗粒变大，使石膏的孔结构恶化，最终导致了宏观强度大幅度下降。