Srp / Waste Sand / Cement Concrete Materials

The object of this topic research is the cement-base composite material what is composed of rubber powder, discarded foundry water glass sand, and cement. Compared with normal concrete this composite material has high impact ductility, impermeability, abrasive resistance etc. This topic mainly carry out an analysis various function of this kind of compound material.When we mix rubber powder as elastic into concrete (called rubber concrete),rubber powder can suppress creation and development of micro-crack, absorb vibrating energy, improve impact ductility, extensibility, impermeability and non-skid property. Impact ductility of rubber concrete is higher when rubber powder is treated by KH550 (called JFK) than it is not(called JFW).Mixed with JFW rubber concrete we call JFW-C, the other we call JFK-C, we compared performance of them in topic research.JFK's influence on elastic modulus of rubber concrete is lower than JFW. When J/C raised from 0% to 40%, elastic modulus of rubber concrete decreased from 2.1×10⁴MPa to 0.7×10⁴MPa. But Poisson ratio's trend is on the contrary, it is setupping, when J/C is 40%, Poisson ratio reaches 0.4. Mixed rubber powder into concrete , the stress strain curve's sloping portion becomes very obvious, moreover the sloping portion gets longer as long as the amount of JFK mixed into concrete raises, that is to say concrete's extensibility becomes better and better. When J/C's vatiation range is 8%-10%, concrete's extensibility is best.Mixed JFW into concrete , only when J/C is 8% impact ductility of JFW-C can be raised a little bit .when J/C becomes greater than 8%, impact ductility of concrete begin to decrease. Mixed JFK into concrete, when J/C is between 2%-10%, impact ductility of JFK-C is higher than normal concrete, along with the increase of J/C , impact ductility is stepupping.JFK-C's Cl^-1 diffusion coefficient is less than JFK-C's .When J/C is 6% , JFW-C's impermeability is best. Along with increase of J/C, JFK-C's D_c begins to decrease, when J/C becomes 8%, JFK-C's D_c is at the lowest notch, JFK-C's impermeability is best.JFW-C's non-skid property is much the same as JFK-C's. Along with the amount of rubber powder mixed into concrete increasing, non-skid property becomes better. when J/C is 20%, non-skid property is best, then BPN trends gently, non-skid property stops to raise.In addition, mixed rubber powder into concrete would make concrete's compressive strength, flexutal strength decrease , restrict the applied situation of rubber concrete. This topic studied to suitable compounding chemicals what is used to improve the strength of interface combine between rubber powder and concrete's basal body , prevent concrete's compressive strength, flexutal strength from decreasing. In this topic, we researched and compared compressive strength, flexutal strength of three kind of rubber concrete, what is mixed untreated rubber powder(called JFW), NaOH treated rubber powder(called JFN), KH550 resin acceptor treated rubber powder(called JFK).Compressive strength, flexutal strength of rubber concrete decreased a big drop, when concrete mixed with JFW whose grain diameter is 40 or 60 mu. Along with the amount of JFW mixed into concrete increasing, compressive strength (3d, 7d, 28d) of rubber concrete descended. There is a similar discipline that is compressive strength decreases slightly when J/C is between 0%-10%, decreases badly when J/C is between 10%-20%,and decreases slightly when J/C is between 20%-50% when mixed rubber powder's grain diameter is 40 and 60 mu.Take grain diameter as an example, two kinds of JFW whose grain diameter is 40 or 60 mu influence compressive strength of concrete likely, only JFW whose grain diameter is 60 mu would influence strength remarkably than 40 mu.Along with increasing of the amount of input JZW, compressive strength of rubber concrete descends. When J/C is between 0%-10%, flexutal strength of rubber concrete decreases slowly; When J/C is between 10%-20%, flexutal strength of rubber concrete decreases badly; When J/C is between 0%-10%, flexutal strength of rubber concrete decreases slowly again.3d, 7d and 28d compressive strength, flexutal strength of JFN-C are higher than JFW-C. When J/C is greater than 8%, compressive strength, flexutal strength of JFN-C decreases badly.When J/C is between 0%-10%, JFK has little influence on compressive strength, flexutal strength of rubber concrete; When J/C is between 10%-20%, compressive strength, flexutal strength of JFK-C decreased badly; When J/C is greater than 20%, compressive strength, flexutal strength of JFK-C decreased slowly. As stated above, JFK, JFW, JFN have similar influence on rubber concrete performance.JFK-10's influence on compressive strength, flexutal strength of rubber concrete is less than JFK-05, JFK-15.JFK-10 is treated by KH550 resin acceptor solution whose thickness is 10%.Furthermore, this topic also mix waste foundry glass sand into concrete substituting natural fine sand in concrete. Waste foundry glass sand can raise 28d compressive strength proved by experiment.When the amount of waste foundry glass sand mixed into concrete is between 0%-60%, compressive strength of concrete raises gently; When the amount of waste foundry glass sand mixed into concrete is 60%, compressive strength of concrete raises highest; When the amount of waste foundry glass sand mixed into concrete is greater than 80%, compressive strength of concrete is less than normal concrete. At the same time, compressive strength of concrete mixed treated waste foundry glass sand is higher than didn't treat.When waste foundry glass sand has been treated, compressive strength of concrete raised obviously. When ZSW/XS is 60%, compressive strength of concrete raised 54.2MPa, it's highest. When ZSC/XS is 60%, compressive strength of concrete raised 57.1 MPa.Waste foundry glass sand's influence on flexutal strength of concrete is similar with influence on compressive strength of concrete. When waste foundry glass sand hasn't been treated, along with increasing input waste foundry glass sand, flexutal strength of concrete raises slowly. When waste foundry glass sand has been treated, along with increasing input waste foundry glass sand, flexutal strength of concrete raises obviously. When ZSC/XS is between 40%-60%, flexutal strength of concrete raises highest, then begins to decrease.In addition, when waste foundry glass sand has been treated, it also can raise abrasive resistance of concrete obvious. Along with increasing the amount of waste foundry glass sand mixed into concrete, elastic modulus of concrete raised firstly and then decreased, this tendency is similar with impact ductility, and when ZS/XS is about 40%, elastic modulus of concrete raised highest, when ZS/XS is about 60%, impact ductility of concrete raised highest.After analyzing rubber powder and used sand's influence on this composite material, this topic carried on a comprehensive experiment analysis. Experiment proved that when rubber powder had been treated by KH550 resin acceptor-KH550, it can raise strength of combine between rubber and basal body in concrete and strength of concrete significantly. At the same time, mix waste foundry glass sand into concrete also can raise strength of concrete, because the solution what is formed by water glass colloid and compounding chemicals can produce reaction with Ca(0H)2 generates calcium silicate colloid. So mix waste foundry glass sand into concrete can grow down the downside influence on strength of concrete which caused by rubber powder, simultaneously also reuse waste foundry glass sand.Finally, this topic investigates the composite material's feasibility in practical application. the composite material substitutes road material will raise wear-resisting property, impact ductility, impermeability, thus increases of service life of road material.