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针对不同掺量磷渣对矿渣水泥浆体水化行为的影响,测试了磷渣掺量0%~30%制备水泥浆体的各龄期强度,并对比了不同龄期浆体孔溶液的PH值,以及水化产物的差异。结果表明:磷渣可用作活性掺合料替代部分的矿粉,在考虑磷渣用量及保证浆体强度的同时,磷渣掺量不宜超过20%,此时浆体的7 d、28 d强度保证率分别在80%、90%以上,对应龄期抗压强度分别在30 MPa、50 MPa以上。而试件孔溶液p H值基本是随着磷渣替代矿渣量的增加呈现减小趋势。XRD图谱表明,随着磷渣替代矿渣掺量的增加,钙矾石晶体衍射峰强度变化有所减弱,说明磷渣掺量过多时,水化速率减慢。热重结果显示:同一龄期时,磷渣达30%时,C-S-H凝胶、钙矾石的形成有所减少;随着龄期的增长,水化产物逐渐增多,热重失重量依次增大。
Aiming at the influence of different dosage of phosphorous slag on the hydration behavior of slag cement paste, the strength of cement paste prepared from 0% ~ 30% phosphorous residue was tested at different ages, and the PH value of slurry at different ages Values, and differences in hydration products. The results show that phosphorus slag can be used as a substitute for some of the ore slag as an active admixture. Considering the amount of phosphorus slag and the strength of the slurry, the content of phosphorus slag should not exceed 20%. At this time, The guaranteed rate of strength is 80% and 90%, respectively, and the corresponding compressive strength at the age of 30 MPa and 50 MPa respectively. However, the value of p H in the sample hole basically decreases with the increase of the amount of substituting slag for phosphorus slag. XRD patterns show that the intensity of the diffraction peak of ettringite decreases with the increase of the amount of substandard slag, which indicates that the hydration rate slows down when the content of phosphorous slag is too much. The results of thermogravimetry showed that the formation of CSH gel and ettringite decreased with the phosphorus slag up to 30% in the same age period. With the increase of age, the hydration products gradually increased and the weight of TGW increased in turn .