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内蒙古科技大学

本科生毕业设计说明书（毕业论文）







题 目：塑钢纤维橡胶混凝土的抗折及劈

裂抗拉性能研究

学生姓名：王忠志

学 号：1063104409 专 业：土木工程

班 级：土木工程4班 指导教师：董素芬






内蒙古科技大学毕业设计说明书（毕业论文）

摘 要

在国内大力推广节能型建筑的大背景下，新型节能高强混凝土研究与开发炙手可热。与普通混凝土相比，橡胶混凝土的韧性、抗开裂、收缩、抗冲击、抗渗性、隔声吸声、隔热保温等性能都有明显提高，使混凝土的耐久性更好，适用范围更广。橡胶混凝土强度低主要是因为橡胶颗粒与混凝土之间界面连接强度低，因此，对橡胶进行界面改性处理是橡胶混凝土的重点研究领域。塑钢纤维是一种新型纤维，它能阻止混凝土的开裂，增强混凝土的强度和韧性。本文以塑钢纤维橡胶混凝土为研究对象，研究了不同橡胶粒径、橡胶掺量、塑钢纤维掺量及橡胶不同改性方式对混凝土工作性、动弹性模量、28d抗折强度及28d劈裂抗拉强度的影响。

混凝土的流动性及容重随橡胶粒径减小、掺量的增大而减小，动弹性模量随橡胶粒径和掺量的增大而减小。随橡胶掺量增大，28d抗折强度先增大后减小，压折比降低，代表韧性增强。橡胶粒径越大，混凝土劈裂抗拉强度越高，随橡胶掺量增大，混凝土劈裂抗拉强度先不变后减小。随塑钢纤维掺量增大，混凝土流动性明显降低，动弹性模量减小，容重降低，但劈裂抗拉强度增大。塑钢纤维掺量为8Kg/m3时对28d抗折强度提高效果最好，压折比最低。用无机盐作改性剂对橡胶进行改性后，混凝土动弹性模量基本不变，用偶联剂作改性剂对橡胶进行改性后，混凝土动弹性模量明显下降。相同条件下， NaOH+NaCl做改性剂效果相对较好。通过正交试验分析可得塑钢纤维混凝土最佳方案是选用5-10目的橡胶颗粒，10%的橡胶掺量和6Kg/m3 的塑钢纤维掺量。其性能指标为，减水剂用量640ml，坍落度14.5cm，容重2374Kg/m3，稍有泌水，动弹性模量35.82 MPa，抗折强度4.31MPa，压折比劈9.07，裂抗拉强2.82MPa。

关键词：工作性；动弹性模量；抗折强度；劈裂抗拉强度；改性方式

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内蒙古科技大学毕业设计说明书（毕业论文）

under the backgronnd of vigorously promote the of energy-saving building in China, the high strength concrete research and its development of new energy-saving is becoming much hot. Compared with ordinary concrete, rubberconcrete's toughness, anti cracking, shrinkage, impact resistance, permeability resistance, sound insulation and sound absorption, insulation and otherproperties are improved, and also the durability of concrete is better, as well as a wider application range. the low strength of Concrete rubber is mainly because of the interface between the rubber particles and the concrete connectionstrength is low, therefore, the rubber surface modification is the key researchfield of rubber concrete. Steel fiber is a new type of fiber, it can prevent thecracking of concrete, enhance the strength and toughness of concrete. In this paper, I have select steel fiber rubber concrete as the research object, to study the effections on the workability of concrete, the dynamic modulus of elasticity, 28d flexural strength and splitting tensile strength of 28d research of .different rubber particle size, amount of rubber, plastic and steel fiber content and rubber of different modification methods

The mobility of concrete and soil bulk density decreased with the diminish of rubber particle size , and increase of volume , and the dynamic elastic modulus of grain size and content . . As the rubber content increases, the 28d flexural strength will increased first and then decreased, as well as ratio of compressive strength reduce, and toughness enhance. the larger of Rubber particle size , the higher of concrete splitting tensile strength , and also the increasingly of rubber content, the concrete splitting tensile strength first unchanged after reduction. With the steel fiber content increased, the fluidity of concrete is obviously reduced, and the dynamic elastic modulus decreased, as well as bulk density decreased, but the splitting tensile strength increases. Steel fiber content for the bending of 28d 8Kg/m3 to improve the effect of the best strength, ratio of compressive strength to the minimum. The rubber modified by inorganic salts, concrete dynamic elastic modulus is basically unchanged, while the rubber modifier as coupling agent, concrete dynamic elastic modulus decreased significantly. Under the same conditions, using the NaOH+NaCl as the modifier is relatively good. Through the analysis of orthogonal test it can be concluded that the best plan of plastic fiber reinforced concrete is selected 5-10 rubber particles, steel fiber content of 10% of the amount of rubber and 6Kg/m3. The performance index, is listed as following: water reducing agent dosage 640ml, slump 14.5cm, weight 2374Kg/m3, little bleeding, the dynamic elastic modulus of 35.82 MPa, flexural strength of 4.31MPa, ratio of compressive strength to chop 9.07, tensile strength 2.82MPa.

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