橡胶粒子改性混凝土的物理力学性能及耐久性研究
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摘要
利用废旧轮胎橡胶粒子改性水泥混凝土是将废橡胶的综合利用与混凝土改性相结合,具有资源利用、环保及材料改性多重意义。本文对橡胶粒子改性水泥砂浆(RMM)和普通混凝土(RMC)的物理力学性能及耐久性能进行了系统的试验研究,并探讨了橡胶颗粒的掺量和橡胶改性等因素对RMC性能的影响。同时,还对掺有橡胶粒子干硬性混凝土的物理力学性能和部分耐久性进行了试验研究,并将其与RMC的性能进行了对比。
对新拌混凝土及砂浆的性能的试验结果表明;掺加橡胶粒子后,水泥砂浆的流动性能会有所提高,混凝土拌合物的含气量增大,混凝土的压力泌水量V_(140)增大,压力泌水率B_V降低,混凝土的工作性能能得到很大改善。
力学性能试验结果显示,橡胶粒子改性水泥砂浆和混凝土的强度均随橡胶粒子掺量的增加而降低,但其冲击韧性会随橡胶粒子掺量的增大而显著提高,抗裂性明显改善;RMC试件在受力破坏时不会像基准混凝土那样快速崩裂或脆断,而是能够保持较完整的形状,表现出较强的抗裂能力;通过对橡胶粒子进行表面改性处理并掺入水泥净浆中,与掺未改性橡胶颗粒水泥净浆相比,可以明显提高其抗压强度,且以钛酸酯偶联剂改性效果最佳。改性处理过的橡胶粒子对改善水泥砂浆的强度降效果不大,对RMC抗压强度降的改善效果也不大,但能明显改善RMC的抗折强度。
橡胶粒子对混凝土耐久性具有正负两方面的影响,掺加橡胶粒子可以改善混凝土的干缩性能、抗冻性以及耐磨性能,但对混凝土的碳化和抗水渗透性能不利。
橡胶粒子对干硬性混凝土强度的负面影响明显要小于普通混凝土,掺有橡胶粒子的干硬性混凝土干缩值更低。与普通混凝土相比,干硬性混凝土更适合掺加橡胶粒子。
Take advantage of waste tire crumb rubber for modifying cement concrete is a multipurpose utilization of waste rubber.It will play a significant role in utilization resources,environmental protection and modified materials.In this paper,the physico-mechanical properties and durability of rubber modified mortars(RMM) and rubber modified concretes(RMC)are investigated systematically.The effect of rubber content and rubber surface modifying on properties of RMC are discussed. The physico-mechanical properties and durability of dry concrete added with crumb rubber are investigated too.And its properties have been compared with RMC's.
Properties of flash concrete and mortar testing indicate that the fluidity of mortars are improved,air content of concrete is increased as the addition of crumb rubber.The addition of crumb rubber can increase the quantity of pressure bleeding (V_(140)),decrease the pressure bleeding rate(B_V)and improve the workability of flash RMC.
Mechanical property testing indicates that the compressive and flexural strengths of mortars and concretes are decreased,but the dynamic ductility is obviously increased.When the RMC is being done strengths test,it wouldn't be quickly broken like the ordinary concrete.And it can still keep in good shape that shows powerful crack resistance.Through surface modification treatment,the modified crumb rubber can improve compressive strength of cement paste obviously.And the modifier titanate coupling agent has the best effect.The treated crumb rubber has little effect in improving strengths of mortar and compressive strength of concrete,but it can bring a striking effect in improving flexural strength of RMC.
Durability research shows that the crumb rubber can reduce the dry shrinkage, improve frost resistance property and abrasion resistance of RMC.But the addition of crumb rubber has negative influence on the carbonation resistance property and impermeability of RMC.
The study of dry concrete added with crumb rubber indicates that,comparing with ordinary concrete,the crumb rubber has less negative influence on dry concrete. And the dry-shrinkage value of dry concrete is much lower than ordinary concrete.It can be drawn the conclusion that dry concrete is more suitable for adding crumb rubber than ordinary concrete.
对新拌混凝土及砂浆的性能的试验结果表明;掺加橡胶粒子后,水泥砂浆的流动性能会有所提高,混凝土拌合物的含气量增大,混凝土的压力泌水量V_(140)增大,压力泌水率B_V降低,混凝土的工作性能能得到很大改善。
力学性能试验结果显示,橡胶粒子改性水泥砂浆和混凝土的强度均随橡胶粒子掺量的增加而降低,但其冲击韧性会随橡胶粒子掺量的增大而显著提高,抗裂性明显改善;RMC试件在受力破坏时不会像基准混凝土那样快速崩裂或脆断,而是能够保持较完整的形状,表现出较强的抗裂能力;通过对橡胶粒子进行表面改性处理并掺入水泥净浆中,与掺未改性橡胶颗粒水泥净浆相比,可以明显提高其抗压强度,且以钛酸酯偶联剂改性效果最佳。改性处理过的橡胶粒子对改善水泥砂浆的强度降效果不大,对RMC抗压强度降的改善效果也不大,但能明显改善RMC的抗折强度。
橡胶粒子对混凝土耐久性具有正负两方面的影响,掺加橡胶粒子可以改善混凝土的干缩性能、抗冻性以及耐磨性能,但对混凝土的碳化和抗水渗透性能不利。
橡胶粒子对干硬性混凝土强度的负面影响明显要小于普通混凝土,掺有橡胶粒子的干硬性混凝土干缩值更低。与普通混凝土相比,干硬性混凝土更适合掺加橡胶粒子。
Take advantage of waste tire crumb rubber for modifying cement concrete is a multipurpose utilization of waste rubber.It will play a significant role in utilization resources,environmental protection and modified materials.In this paper,the physico-mechanical properties and durability of rubber modified mortars(RMM) and rubber modified concretes(RMC)are investigated systematically.The effect of rubber content and rubber surface modifying on properties of RMC are discussed. The physico-mechanical properties and durability of dry concrete added with crumb rubber are investigated too.And its properties have been compared with RMC's.
Properties of flash concrete and mortar testing indicate that the fluidity of mortars are improved,air content of concrete is increased as the addition of crumb rubber.The addition of crumb rubber can increase the quantity of pressure bleeding (V_(140)),decrease the pressure bleeding rate(B_V)and improve the workability of flash RMC.
Mechanical property testing indicates that the compressive and flexural strengths of mortars and concretes are decreased,but the dynamic ductility is obviously increased.When the RMC is being done strengths test,it wouldn't be quickly broken like the ordinary concrete.And it can still keep in good shape that shows powerful crack resistance.Through surface modification treatment,the modified crumb rubber can improve compressive strength of cement paste obviously.And the modifier titanate coupling agent has the best effect.The treated crumb rubber has little effect in improving strengths of mortar and compressive strength of concrete,but it can bring a striking effect in improving flexural strength of RMC.
Durability research shows that the crumb rubber can reduce the dry shrinkage, improve frost resistance property and abrasion resistance of RMC.But the addition of crumb rubber has negative influence on the carbonation resistance property and impermeability of RMC.
The study of dry concrete added with crumb rubber indicates that,comparing with ordinary concrete,the crumb rubber has less negative influence on dry concrete. And the dry-shrinkage value of dry concrete is much lower than ordinary concrete.It can be drawn the conclusion that dry concrete is more suitable for adding crumb rubber than ordinary concrete.
引文
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