Concrete retarder and preparation method thereof

The invention belongs to the field of preparation of concrete admixtures, and particularly relates to a concrete retarder and a preparation method thereof. The brand-new concrete retarder is preparedfrom treated industrial byproduct phosphogypsum, attapulgite powder, modified starch, Arabic gum and phosphate. The retarder is added into the concrete, so that the retarding effect of the concrete added with the retarder reaches 16 h, the retarding effect can reach 13 h at the air temperature of 35 DEG C, the influence of environmental factors on the quality of the concrete is reduced, and the problems of cracking and the like caused by the temperature difference between the inside and the outside of the concrete are effectively reduced. 本发明属于混凝土外加剂制备领域，具体涉及一种混凝土缓凝剂及其制备方法；采用经处理的工业副产磷石膏、凹凸棒粉、改性淀粉、阿拉伯胶和磷酸盐制备一种全新的混凝土缓凝剂，使得添加了缓凝剂的混凝土缓凝效果达到16h，在35℃的气温下缓凝效果可达13h，降低了环境因素对混凝土质量的影响，有效减少了由于混凝土内外温差而引起的开裂等问题的出现。