新型弹性混凝土试验研究及应用前景

Experimental study on new elastic concrete and application in bridge expansion joint engineering

为了解决弹性混凝土强度下降的难题,应用偶联剂及乳化橡胶乳液进行改性处理,对其物理力学性能进行试验研究,结果表明:随着胶粒量增加,力学性能下降明显,但变形量增大。偶联剂和乳化橡胶的掺入对力学性能、抗冲击性能及耐磨性都有较大提高,28d抗压强度提高17.3%、抗冲磨强度提高12.7%,且失粘时间缩短,较好地解决了弹性混凝土力学性能下降及施工难题。

In order to solve the problem in the strength decline of elastic concrete, its modification treatment was carried out by using couphng agent and emulsion robber. Meanwhile we studied its physical and mechanical properties. The results were as follows： With the increase of colloidal particle＇ s content, the physical properties of elastic concrete decreased significantly, but deformation increased. While the mechanical properties, impact resistance and wear resistance all greatly increased with the addition of coupling agent and emulsion rubber, and the compressive strength, wear resistance enhanced by 17.3%, 12.7% respectively within 28 days and tack free time shortened, which effectively dealt with the difficult problem of the decline in the strength of elastic concrete and construction. Meanwhile, we put forward the construction technology and application prospect of bridge expansion joint engineering. The conclusions above have very important reference value for the further study and appliation of this new elastic concrete in expansion joint engineering.