Plastic is a waste that cannot be decomposed easily, plastic need about a ten to hundreds years to be decomposed perfectly depends on the plastic type. According to CNN, Indonesia is a second largest plastic waste contributor after China with more than 1 million in a minute, 50 percent are just single use then throw away and 5 percent are the truly recycle plastic waste. Along with the current development, there are a lot of innovations to the all things, one of them is substitute the aggregate with plastic, in this thing, plastic will substitute the aggregate pass the ¾ aggregate filters and strained the number 4 aggregate filter substitute with LDPE, PP and PET Plastic each. This research is aimed for evaluating and comparing the effect of adding or substitute the aggregate with LDPE, PP and PET plastics type for designing asphalt concrete. There are four test that related to strength and durability of Asphalt Cocrete: Unconfined Compressive Strength (UCS), Indirect Tensile Strength (ITS) test, Cantabro test, and Permeability test, each of them has a value and each of test will be comparing the specimen test whose aggregate is substitute on LDPE, PP and PET. The result of this research show that in the UCS test PP miture speciment test can hold the vertical pressure 253.41% stronger than PET and 399.12% stronger than LDPE. In ITS test PP mix object 56.29% stronger than PET and 396.90% stronger than LDPE. In the Cantabro test PP mix has durability 1.33% better than PET and 1.60% better than LDPE and in the Permeability test PP has a better classification to be the Asphalt Concrete Wearing Course with Practically Impervious classification.

The research aimed to examine the effect of red dragon fruit skin and guava leaves supplemented into beef cattle feed on the concentration of partial VFA and methane gas production. The in vitro study was conducted in a completely randomized design (CRD) with 3 treatments, namely P0: 50 % concentrate + 50 % ammoniated straw (Control), P1: 50 % concentrate + 50 % ammoniated straw + 5 % red dragon fruit skin flour, and P2: 50 % concentrate + 50 % ammonia straw + 5 % red dragon fruit  skin flour + 2.5 % guava leaf flour. The concentrate consisted of 2 parts of rice bran and 1 part of coconut meal. The ratio of concentrat and ammoniated rice straw was 50:50. Each treatment was repeated 6 times. The results showed that the concentration of acetic acid, butyrate and methane gas decreased while the concentration of propionate increased with the addition of red dragon fruit and guava leaves. The research concluded that the addition of 5 % red dragon fruit skin flour combined with 2.5 % guava leaves flour in beef cattle feed could further reduce the concentration of acetic acid, butyric acid and the production of methane gas, but increase the concentration of propionic acid. It is suggested that defaunated agents of red dragon fruit skin and guava leaves could reduce the production of methane gas in the rumen of beef cattle.