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糯米浆水泥砂浆的抗压与抗折性能试验研究

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糯米浆水泥砂浆是一种创造性的新型复合材料,探讨其力学性能和强度机理,对于未来的工程应用是一项十分必要的工作.为此,以糯米浆浓度和砂浆龄期为变量,展开5组糯米浆水泥砂浆试块的抗压与抗折性能对比试验和微观结构电镜分析.结果表明,浓度处于0.3％左右的糯米浆的加入,可以使后期的水泥砂浆微观结构趋于密实,抗折强度显著提高;而浓度大于1.0％的糯米浆的加入,将使后期的水泥水化产物聚合成团,微观结构松散,抗折强度大幅下降;这是因为随着糯米浆的加入,可以阻碍早期水泥水化反应的进行,从而使水泥砂浆早期强度偏低.分析机理可知,这种现象是由于糯米浆的加入引起浆体产生"减水"作用、聚合作用与缓凝作用造成的.
Strength Experiment and Mechanism Analysis of Cement Mortar with Sticky Rice Pulp
Cement mortar with sticky rice pulp is an innovative composite material.Investigating its mechanical properties and strength mechanism is essential for the future engineering application.Taking the pulp concentration and the mortar ages as the variables,we tested five groups of blocks for the compressive strength and flexural strength,and observed their microstructures with a scanning electronic mi-croscope.The results indicated that the microstructure got dense if the added pulp had a concentration of about 0.3％,and thereby its flex-ural strength would significantly improve,while the hydration products agglomerated and the microstructure got loose if the added pulp had a concentration of more than 1.0％,which caused a substantial decline in flexural strength.Besides,the hydration reaction was hin-dered at the early stage due to the addition of the pulp;hence the early strength of the mortar is on the low side.According to the strength mechanism analysis,all the results are mainly attributed to the effects:"water-reduction",agglomeration and retarding,caused by the addi-tion of the pulp.

sticky rice pulpcement mortarcompressive strengthflexural strengthagemicrostructurestrength mechanism

张鹄志、熊新才、李小宝、周鲁云、李立、吴圣丰、李玉琦、冯帅、周晓枫

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湖南科技大学土木工程学院,湖南湘潭 411201

湖南大学土木工程学院,湖南长沙 410008

糯米浆 水泥砂浆 抗压强度 抗折强度 龄期 微观结构 强度机理

College Students Research Learning and Innovative Experiment Project of Hunan ProvinceNatural Science Foundation of Hunan Province

S2020126490012021JJ30270

2024

10.1051/wujns/2024294383

武汉大学自然科学学报(英文版)
武汉大学

武汉大学自然科学学报(英文版)

CSTPCD
影响因子：0.066
ISSN：1007-1202
年,卷(期)：2024.29(4)
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