Synthesis and Properties of Sulfonated Starch as Superplasticizer
Synthesis and Properties of Sulfonated Starch as Superplasticizer
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发表时间：
2006
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通讯作者：
Cheng Fa
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作者：
Cheng Fa
以ClSO_3H为磺化剂，CH_2Cl_2为分散剂，采用半干法制备了磺化淀粉，并对其作为水泥减水剂的性能进行了系统的研究。结果表明，磺化淀粉的减水率随取代度（DS）的增加而增加，当取代度达到50%时，磺化淀粉的减水率为100%左右（0.060 4），磺化淀粉的质量分数为0.3%，测试的指标包括减水率，水泥净浆凝结时间和砂浆抗压强度（3 d和28 d）均符合超塑化剂的GB要求。此外，磺化淀粉具有一定的缓凝作用，XRD和SEM测试结果表明，磺化淀粉掺入水泥后，早期水化较慢但经过28 d的长时间水化后，硬化水泥浆体的结构变得更加均匀致密，抗压强度也更高，而且所需磺化淀粉的质量分数低于其他减水剂。
Sulfonated starch was prepared by semidry method using ClSO_3H as sulfonating reagent and CH_2Cl_2 as dispersant.Its performance as water-reducing admixture for cement is studied systematically.The results showed that the water reducing ratio of sulfonated starch is increased with the degree of substitution(DS).When the DS reached(0.060 4) and the mass fraction of sulfonated starch is 0.3%,the indexes tested including the water reducing ratio,the setting time of cement paste and the compressive strength of mortar(3 d and 28 d) all meet the GB requirements of superplasticizing admixture.In addition,the sulfonated starch presents some set retarding effects.Results of XRD and SEM tests show that the hydration is slow at early days when sulfonated starch is mixed into the cement paste.But after a long period of hydration such as 28 days,the structure of the hardened cement paste becomes more uniform and compact than that of the control,and the compressive strength is also stronger.Moreover,the mass fraction of sulfonated starch needed is lower than that with other superplasticizers.