SOME INVESTIGATIONS INTO THE USE OF SUGAR AS AN ADMIXTURE TO CONCRETE
SOME INVESTIGATIONS INTO THE USE OF SUGAR AS AN ADMIXTURE TO CONCRETE
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DOI：
10.1680/iicep.1965.9477
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发表时间：
1965-06
期刊：
影响因子：
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通讯作者：
R. Ashworth
中科院分区：
文献类型：
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作者：
R. Ashworth
将少量的糖/最多占水泥重量的0.25%/添加到波特兰水泥混凝土混合物中，以确定对各种混凝土性能的影响。这些声明涵盖了广泛的水泥成分和混合比例，并表明糖是一种减水、缓凝外加剂，其特性与许多商业缓凝剂相似。对于一般用途，似乎0.05%的糖，与普通波特兰水泥延迟约4小时，将是符合惯例要求的最合适的量。除了延缓作用之外，还发现，这种量的糖增加了混凝土的强度，无论是在压缩还是弯曲方面，并提供了更好的工作混合物。这些因素将使配合比设计能够达到规定的强度和可加工性，从而实现高达15%的水泥含量减少。这相当于节省高达6S.0D的材料成本。每单位。YD的混凝土，其中的外加剂的成本将是约2D。如果在将样本放入水中之前进行初始延迟，则糖对混凝土的密度、耐久性、收缩或吸收性能没有显著影响，养护方法也不重要。没有证据表明混合物中的糖溶液发生迁移，并导致浓度升高。RRL/A/
SMALL QUANTITIES OF SUGAR /UP TO .25% BY WEIGHT OF CEMENT/ WERE ADDED TO PORTLAND CEMENT CONCRETE MIXES TO DETERMINE THE EFFECT ON VARIOUS CONCRETE PROPERTIES. THE INVESTIGATIONS COVERED A WIDE RANGE OF CEMENT COMPOSITION AND MIX PROPORTIONS, AND SHOWED THAT SUGAR IS A WATER- REDUCING, SET-RETARDING ADMIXTURE SIMILAR IN CHARACTER TO MANY COMMERCIAL RETARDERS. FOR GENERAL USE, IT WOULD SEEM THAT 0.05% SUGAR, GIVING ABOUT 4 HOURS RETARDATION WITH ORDINARY PORTLAND CEMENT, WOULD BE THE MOST SUITABLE AMOUNT COMPATIBLE WITH CONSTRUCTIONAL REQUIREMENTS. IN ADDITION TO THE RETARDING ACTION, IT WAS FOUND THAT THIS AMOUNT OF SUGAR INCREASED THE STRENGTH OF CONCRETE, BOTH IN COMPRESSION AND FLEXURE, AND GAVE A MORE WORKABLE MIX. THESE FACTORS WOULD ENABLE THE MIX DESIGN FOR A SPECIFIED STRENGTH AND WORKABILITY TO BE ADJUSTED, THUS ACHIEVING A REDUCTION IN CEMENT CONTENT OF UP TO 15%. THIS IS EQUIVALENT TO A SAVING IN MATERIAL COSTS OF UP TO 6S.0D. PER CU. YD OF CONCRETE, FOR WHICH THE COST OF THE ADMIXTURE WOULD BE ABOUT 2D. SUGAR HAD NO NOTICEABLE EFFECT ON THE DENSITY, DURABILITY, SHRINKAGE OR ABSORPTION PROPERTIES OF CONCRETE, NOR WAS THE METHOD OF CURING IMPORTANT, PROVIDED THAT THE INITIAL RETARDATION HAD TAKEN PLACE BEFORE THE SPECIMENS WERE PLACED IN WATER. THERE WAS NO EVIDENCE OF MIGRATION OF THE SUGAR SOLUTION WITHIN THE MIX AND CONSEQUENT CONCENTRATION./RRL/A/